HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$259+ Cheap flights from Chicago (CHI) to London (LON)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LON
Mar 18 — Mar 251
Tue 3/18
Tue 3/25
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Chicago to London with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Chicago to London are usually found in February or November, booked 68 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Chicago to London

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 13, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$587
(Gotogate)

One-way from

$259
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$709

Good round-trip deal

$678 or less

Good one-way deal

$460 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
Search Deals
From Chicago (CHI) to London (LON)
Search Deals
One-way flight from Chicago (CHI) to London (LON)
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($173 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
Search Deals
Price to beat on a round-trip flight from Chicago (CHI) to London (LON).
Search Deals
Price to beat on a one-way flight from Chicago (CHI) to London (LON).
Search Deals

Find flight deals from Chicago to London

Cheapest flights from Chicago to London
Explore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 13, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/72:55 pmORD - LHR
1 stop10h 55mIberia
Tue 10/2112:15 pmLHR - ORD
Nonstop8h 35mIberia
Deal found 3/13$586
This Flighttix deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/77:30 pmORD - LHR
1 stop10h 25mIcelandair
Tue 4/291:05 pmLHR - ORD
1 stop11h 10mIcelandair
Deal found 3/13$587
This Mytrip deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/39:08 pmORD - LGW
1 stop30h 52mMultiple Airlines
Thu 4/248:00 amLGW - ORD
3 stops31h 24mMultiple Airlines
Deal found 3/12$587
This Booking.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/267:25 pmORD - LGW
1 stop13h 05mIcelandair
Sat 5/31:00 pmLGW - ORD
1 stop11h 15mIcelandair
Deal found 3/12$588
This Bravofly deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/168:50 pmORD - LHR
1 stop9h 50mAer Lingus
Tue 4/228:50 amLHR - ORD
1 stop11h 10mAer Lingus
Deal found 3/11$590
This Mytrip deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/247:25 pmORD - STN
2 stops16h 00mMultiple Airlines
Mon 4/286:10 amSTN - ORD
2 stops18h 05mMultiple Airlines
Deal found 3/12$590
This Booking.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/79:15 pmORD - LHR
Nonstop7h 45mFinnair
Tue 4/299:30 amLHR - ORD
1 stop14h 20mFinnair
Deal found 3/13$591
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/71:23 pmMDW - LGW
1 stop14h 37mMultiple Airlines
Tue 4/292:00 pmLGW - MDW
2 stops31h 13mMultiple Airlines
Deal found 3/12$600
This Cheapflightsfares deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/28:35 pmORD - LHR
Nonstop7h 55mMultiple Airlines
Wed 9/108:25 amLHR - ORD
1 stop13h 20mMultiple Airlines
Deal found 3/13$606
This Scandinavian Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/178:40 pmORD - LHR
1 stop16h 00mScandinavian Airlines
Mon 3/247:05 amLHR - ORD
2 stops16h 45mScandinavian Airlines
Deal found 3/12$613
This oojo deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/25:36 pmORD - LHR
1 stop13h 09mBritish Airways
Mon 4/76:10 pmLHR - ORD
1 stop29h 40mBritish Airways
Deal found 3/12$614
This Mytrip deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/227:25 pmORD - LTN
2 stops21h 30mMultiple Airlines
Thu 5/18:45 amLTN - ORD
3 stops37h 14mMultiple Airlines
Deal found 3/12$614

Find flights from Chicago to London within your budget

Customize your flight search to find flights from Chicago to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 13, 2025.

Fly from

Chicago

Fly to

London

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 4/7

7:30 pm-11:55 am

1 stop10h 25m

London Heathrow

Tue 4/29

1:05 pm-6:15 pm

1 stop11h 10m

$587

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 4/3

9:08 pm-10:00 am

1 stop30h 52m

London Gatwick

Thu 4/24

8:00 am-9:24 am

3 stops31h 24m

$587

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/22

10:20 pm-12:15 pm

Nonstop7h 55m

London Heathrow

Thu 5/1

12:15 pm-2:45 pm

Nonstop8h 30m

$588

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sat 4/26

7:25 pm-2:30 pm

1 stop13h 05m

London Gatwick

Sat 5/3

1:00 pm-6:15 pm

1 stop11h 15m

$588

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 4/16

8:50 pm-12:40 pm

1 stop9h 50m

London Heathrow

Tue 4/22

8:50 am-2:00 pm

1 stop11h 10m

$590

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Thu 4/24

7:25 pm-5:25 pm

2 stops16h 00m

London Stansted

Mon 4/28

6:10 am-6:15 pm

2 stops18h 05m

$590

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 4/7

9:15 pm-11:00 am

Nonstop7h 45m

London Heathrow

Tue 4/29

9:30 am-5:50 pm

1 stop14h 20m

$591

ChicagoLondon

MDW - LGW

MDWLGW

Chicago Midway

Mon 4/7

1:23 pm-10:00 am

1 stop14h 37m

London Gatwick

Tue 4/29

2:00 pm-3:13 pm

2 stops31h 13m

$600

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/1

11:42 am-6:50 am

1 stop13h 08m

London Heathrow

Mon 4/7

6:10 pm-5:50 pm

1 stop29h 40m

$613

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 4/7

12:48 pm-7:15 am

1 stop12h 27m

London Heathrow

Tue 4/29

11:45 am-6:20 pm

1 stop12h 35m

$614

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/12

Showing 1-10 of 60 results
1
2
3
...
6

Compare providers for flights from Chicago to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to London in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*2 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
FlightnetworkPrice Accuracy-Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Chicago to London flights

Find out what our experts recommend to make the most of your Chicago to London trip
Airlines
British Airways

BA's Club Suite offers solo pods with doors for privacy; available on most 777s and A350s.


BA's World Traveller Plus provides extra seat width and legroom, ideal for long-haul comfort.

Read more about British Airwaysby Gabriel Leigh
Iberia

Iberia's premium economy offers 37-inch legroom, footrests, and noise-canceling headphones for long-haul comfort.


Iberia's business class features lay-flat beds with massage function and adjustable pillows for ultimate relaxation.

Read more about Iberiaby Emily Zemler
Airports
ORD

For a quick check-in at ORD, use the United Club kiosks in Terminal 1 for faster service and access to amenities.

Read more about ORDby Ramsey Qubein
LHR

Take the Heathrow Express for the fastest route to central London, reaching Paddington Station in just 15 minutes.

Read more about LHRby Ramsey Qubein
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Emily Zemler

Emily Zemler

Expert on Iberia

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on ORD and LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.

Best time to book a flight from Chicago to London

Have a flexible travel schedule? Discover the best time to fly to London from Chicago with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Chicago to London

Get recent, data-driven insights about flights from Chicago to London including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Chicago to London?

Use this chart to determine the optimal time to book a round-trip flight from Chicago to London. Price data was last updated on March 7, 2025.

The best time to book flights from Chicago to London is 68 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Chicago to London?

Currently, November is the cheapest month in which you can book a flight from Chicago to London (average of $661). Flying from Chicago to London in June is currently the most expensive (average of $1,127). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CHI to LON?

Find hourly flight availability from Chicago to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 13, 2025.

A simple way to save on the total cost of your ticket is to fly from Chicago to London in the morning. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight in the evening.

What is the cheapest day to fly from Chicago to London?

Use this chart to determine the cheapest time to fly round-trip from Chicago to London. Price data was last updated on September 22, 2024.

Travelers seeking maximum savings on their Chicago to London flight should consider departing on Wednesday at noon when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Chicago to London

Explore weekly flight availability from Chicago to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 13, 2025.

The most flights from CHI to LON are scheduled on a Wednesday (38 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (31 on average).

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated March 13, 2025.
Read reviews from past customers who have flown Delta, Porter Airlines and KLM from Chicago to London. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,947 reviews

Food

7.3

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
7,947 reviews
Delta
8.0
Very good
7,947 reviews

Food

7.3

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Porter Airlines
8.0
Very good
278 reviews
Delta
8.0
Very good
7,947 reviews

Food

7.3

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,320 reviews
Delta
8.0
Very good
7,947 reviews

Food

7.3

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air Transat
7.8
Good
379 reviews
Delta
8.0
Very good
7,947 reviews

Food

7.3

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair
7.6
Good
1,268 reviews
Delta
8.0
Very good
7,947 reviews

Food

7.3

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Chicago to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Chicago to London round-trip?

    Icelandair, at $587, was found to be the cheapest airline from Chicago to London.Alternate airlines to your destination round-trip include Iberia and Aer Lingus. Icelandair is 22% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Chicago to London one-way?

    $266 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on TAP AIR PORTUGAL and JetBlue, with prices starting from $268 and $274, respectively.

  • What are the most popular routes from Chicago to London?

    The most popular route from Chicago to London is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City.

  • What are the most reliable airlines from Chicago to London?

    Before booking your flight to London from Chicago, check out the most reliable airlines to get you to your destination on time: Aer Lingus (81%), American Airlines (74%), Alaska Airlines( 74%).

  • What are the cheapest flights from Chicago to London?

    Looking at all options, your cheapest flight can be booked for $405. While the most popular route (Chicago O'Hare Intl - London Heathrow) can be booked for $505 on average our data indicates $2,988 when flying from Chicago to London.

  • Where are the most common layover locations when flying from Chicago to London?

    Of the flights from Chicago to London that have layovers, most of them stop in Reykjavik. Dublin sees the next most layovers on Chicago to London flights.

  • What are some popular things to do or see while on a layover in Reykjavik?

    Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are located about 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers can book a car rental at Reykjavik Keflavik Intl for about $53 per day to make their sightseeing more efficient.

  • What are some popular points of interest to see during a layover in Dublin?

    Most Dublin visitors opt to spend their time at Molly Malone Statue, St. Patrick's Cathedral, and Parnell Square. Molly Malone Statue, St. Patrick's Cathedral and Parnell Square are located about 5.8 mi, 6.1 mi, and 5.0 mi, respectively from Dublin if you are interested in checking them out. Those on a layover in Dublin in need of a rental car can book one at Dublin for about $21.

  • Where are the least popular layover locations for Chicago to London flights?

    Chicago to London flights have a layover in Lisbon least often. Lisbon is followed by Copenhagen in terms of the least popular layover location on flights from Chicago to London.

  • Can I find deals for flights from Chicago to London that include hotel bookings?

    Yes. In addition to deals on Chicago to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to London.

  • Can I find deals for business class flights from Chicago to London?

    Yes. Cheapflights offers flight deals from Chicago to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago to London?

    Currently, November is the cheapest month in which you can book a flight from Chicago to London (average of $661). Flying from Chicago to London in June is currently the most expensive (average of $1,127). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Luton
Wembley
Harrow
Horley
Canterbury
Gatwick
Milton Keynes
Dover
Orpington
Watford
Croydon
Borehamwood
Bromley
Folkestone
Ilford
Aylesbury
Chelmsford

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Chicago to London

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Heathrow flights
O'Hare Intl to Gatwick flights
O'Hare Intl to London City flights
Midway to Heathrow flights
O'Hare Intl to Edinburgh flights
St. Louis to Heathrow flights
O'Hare Intl to Stansted flights
St. Louis to Gatwick flights
O'Hare Intl to Luton flights
Midway to Edinburgh flights
O'Hare Intl to Manchester flights
St. Louis to London City flights
Midway to Gatwick flights
Midway to Manchester flights
St. Louis to Edinburgh flights
O'Hare Intl to Birmingham flights
St. Louis to Manchester flights
O'Hare Intl to Southampton flights
O'Hare Intl to Leeds flights
Evansville to Heathrow flights
O'Hare Intl to Liverpool flights
Peoria to Heathrow flights
Midway to Birmingham flights
Moline to Heathrow flights
Midway to Leeds flights
O'Hare Intl to Bristol flights
St. Louis to Birmingham flights
Midway to London City flights
Midway to Luton flights
Midway to Southampton flights
Midway to Bristol flights
St. Louis to Stansted flights
Midway to Newcastle upon Tyne flights
O'Hare Intl to Newcastle upon Tyne flights
Springfield to Heathrow flights
Evansville to Leeds flights
O'Hare Intl to Newquay flights
Peoria to Gatwick flights
Evansville to Gatwick flights
St. Louis to Luton flights
O'Hare Intl to Exeter flights
St. Louis to Leeds flights
O'Hare Intl to Grimsby flights
O'Hare Intl to Darlington flights
Peoria to London City flights
Evansville to Manchester flights
Bloomington to Heathrow flights
Champaign to Heathrow flights
Moline to Gatwick flights

Top 10 airlines flying from Chicago to London

Discover the top 10 airlines that operate flights from Chicago to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$252Average$836FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$381Average$600FlexibilityNo cancel feeOn-time77%
DeltaCheapest$451Average$814FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$466Average$630FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$506Average$762FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$516Average$679FlexibilityNo cancel feeOn-time62%
LufthansaCheapest$519Average$911FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$554Average$752FlexibilityNo cancel feeOn-time67%
FinnairCheapest$565Average$727FlexibilityNo cancel feeOn-time76%
IberiaCheapest$581Average$860FlexibilityNo cancel feeOn-time77%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.