Bangkok

$475+ Cheap flights from Ontario (ONT) to Bangkok

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 3/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Mar 18 — Mar 251
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The best prices from Ontario to Bangkok are usually found in September or March, booked 63 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from Ontario to Bangkok

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Bangkok (TH1). 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.

Round-trip from

$737
(Delta)

One-way from

$475
(oojo)

Popular in

June

Cheapest in

September

Average price

$874
From Ontario to Bangkok
One-way flight from Ontario to Bangkok
Highest demand for flights based on searches. 23% potential increase in price ($323 potential increase over avg. RT price).
Cheapest flight prices on average. 5% potential price decrease ($52 potential savings vs. average RT price).
Average for round-trip flights in March 2025

Find flight deals from Ontario to Bangkok

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

This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/245:45 amONT - BKK
2 stops26h 00mDelta
Mon 5/129:50 amBKK - ONT
2 stops22h 29mDelta
Deal found 3/12$737
This StudentUniverse 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/235:45 amONT - BKK
2 stops27h 55mKorean Air
Wed 5/711:30 pmBKK - ONT
2 stops32h 49mKorean Air
Deal found 3/12$788
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/712:10 amONT - BKK
1 stop26h 10mChina Airlines
Tue 6/1710:50 amBKK - ONT
1 stop21h 10mChina Airlines
Deal found 3/12$825
This Korean Air 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/37:00 amONT - BKK
2 stops26h 45mMultiple Airlines
Sun 11/161:00 amBKK - ONT
2 stops27h 23mMultiple Airlines
Deal found 3/12$831
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/235:00 amONT - BKK
2 stops28h 55mUnited Airlines
Wed 4/309:35 amBKK - ONT
2 stops46h 26mUnited Airlines
Deal found 3/12$864
This Justfly.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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/111:10 pmONT - BKK
1 stop22h 50mSTARLUX Airlines
Wed 10/81:10 pmBKK - ONT
1 stop17h 55mSTARLUX Airlines
Deal found 3/13$908
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.
Wed 4/912:10 amONT - DMK
2 stops33h 05mMultiple Airlines
Thu 4/177:30 amDMK - ONT
2 stops24h 30mMultiple Airlines
Deal found 3/12$1,053

Find flights from Ontario to Bangkok within your budget

Customize your flight search to find flights from Ontario to Bangkok 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

Ontario

Fly to

Bangkok

Route

Depart

Return

Price

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 4/24

5:45 am-9:45 pm

2 stops26h 00m

Bangkok Suvarnabhumi

Mon 5/12

9:50 am-6:19 pm

2 stops22h 29m

$737

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 4/23

5:45 am-11:40 pm

2 stops27h 55m

Bangkok Suvarnabhumi

Wed 5/7

11:30 pm-6:19 pm

2 stops32h 49m

$788

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 4/7

12:10 am-4:20 pm

1 stop26h 10m

Bangkok Suvarnabhumi

Tue 6/17

10:50 am-6:00 pm

1 stop21h 10m

$825

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 4/23

5:00 am-11:55 pm

2 stops28h 55m

Bangkok Suvarnabhumi

Wed 4/30

9:35 am-6:01 pm

2 stops46h 26m

$864

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 8/6

11:45 pm-12:00 pm

1 stop22h 15m

Bangkok Suvarnabhumi

Wed 8/27

1:10 pm-5:40 pm

1 stop18h 30m

$911

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 8/15

7:00 am-11:25 pm

2 stops26h 25m

Bangkok Suvarnabhumi

Fri 8/29

2:35 am-5:22 pm

2 stops28h 47m

$982

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Wed 4/9

12:10 am-11:15 pm

2 stops33h 05m

Bangkok Don Mueang Intl

Thu 4/17

7:30 am-6:00 pm

2 stops24h 30m

$1,053

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 3/18

6:00 am-6:40 am

2 stops34h 40m

$475

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 3/25

11:45 pm-9:50 am

1 stop20h 05m

$481

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 4/22

5:45 am-9:45 pm

2 stops26h 00m

$485

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/12

Showing 1-10 of 17 results
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Best time to book a flight from Ontario to Bangkok

Have a flexible travel schedule? Discover the best time to fly to Bangkok from Ontario 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 Ontario to Bangkok

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

How far ahead should I book a flight from Ontario to Bangkok?

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

Booking 63 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Bangkok. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Ontario to Bangkok?

Currently, February is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $968). Flying from Ontario to Bangkok in June is currently the most expensive (average of $1,577). 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 ONT to BKK?

Find hourly flight availability from Ontario to Bangkok. 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.

It’s typically best to fly out from Ontario to Bangkok in the morning. Doing so could potentially save you 29% on the flight price compared to flying in the afternoon, which is usually more expensive.

Rainfall in Bangkok by month

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

In terms of precipitation, rainfall in Bangkok ranges from 0.4 - 12.6 inches per month. September is typically the wettest month, when rainfall can reach 12.6 in. January is typically the driest time to visit Bangkok when rainfall is around 0.4 in.

Temperature in Bangkok by month

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

If weather is an important factor for your trip to Bangkok, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 86.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).

Reviews of airlines servicing Bangkok

Get insights into the airlines that provide service to Bangkok. 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 Bangkok. Reviews last updated March 13, 2025.
See what other customers who have flown with STARLUX Airlines, Korean Air and Japan Airlines from Ontario to Bangkok have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

9.1

Comfort

9.0

Crew

9.3

Entertainment

9.1

Food

9.0

Boarding

9.1

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Overall

9.1

Comfort

9.0

Crew

9.3

Entertainment

9.1

Food

9.0

Boarding

9.1

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Overall

9.1

Comfort

9.0

Crew

9.3

Entertainment

9.1

Food

9.0

Boarding

9.1

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Overall

9.1

Comfort

9.0

Crew

9.3

Entertainment

9.1

Food

9.0

Boarding

9.1

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Overall

9.1

Comfort

9.0

Crew

9.3

Entertainment

9.1

Food

9.0

Boarding

9.1

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

8.0
Very good

Overall

9.1

Comfort

9.0

Crew

9.3

Entertainment

9.1

Food

9.0

Boarding

9.1

Reviews

1 / 5

10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Bangkok. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly from for flights from Ontario to Bangkok?

    Located just 3.1 mi from the city center, Ontario is the airport most travelers will use when flying to Bangkok from Ontario. Booking flights from Ontario (ONT) to Bangkok should be relatively easy as there are 0 daily outbound flights to Bangkok from 4 different airlines.

  • What are the cheapest airlines flying from Ontario to Bangkok round-trip?

    Our cheapest airline available from Ontario to Bangkok is Delta. Our recent data shows that you can find tickets from as low as $737 on this airline. Additional options worth looking into are Korean Air and China Airlines, starting at $788 and $825 round-trip. Delta is priced at 30% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Bangkok one-way?

    The cheapest airline one-way is Qatar Airways, with whom users have recently found tickets for as low as $475. However, be on the lookout for offers from China Airlines and Delta, as they are both options that can get you from Ontario to Bangkok for a low price.

  • Can I find deals for flights from Ontario to Bangkok that include hotel bookings?

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

  • How can I find direct flights from Ontario to Bangkok?

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

  • Can I find deals for business class flights from Ontario to Bangkok?

    Yes. Cheapflights offers flight deals from Ontario to Bangkok 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 Ontario to Bangkok?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $968). Flying from Ontario to Bangkok in June is currently the most expensive (average of $1,577). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to Bangkok

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Ontario to Bangkok

Discover the top 4 airlines that operate flights from Ontario to Bangkok. 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
Korean AirCheapest$785Average$871FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
DeltaCheapest$807Average$995FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$827Average$933FlexibilityNo cancel feeOn-time70%
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