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$418+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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Cheapflights Tip: 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 May 1, 2025.

Round-trip from

$777
(Delta)

One-way from

$418
(United Airlines)

Popular in

June

Cheapest in

September

Average price

$1,045
From Ontario to Bangkok
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One-way flight from Ontario to Bangkok
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Highest demand for flights based on searches. 22% potential increase in price ($312 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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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 May 1, 2025.

This StudentUniverse deal was found by Cheapflights users on 4/30. 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.
Tue 5/65:45 amONT - BKK
2 stops26h 00mKorean Air
Mon 5/199:40 pmBKK - ONT
2 stops34h 40mKorean Air
Deal found 4/30$774
This Delta deal was found by Cheapflights users on 4/30. 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.
Wed 5/76:00 amONT - BKK
2 stops25h 45mDelta
Mon 5/269:50 amBKK - ONT
2 stops22h 30mDelta
Deal found 4/30$777
This United Airlines deal was found by Cheapflights users on 4/30. 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.
Thu 8/216:00 amONT - BKK
2 stops27h 55mUnited Airlines
Wed 9/109:35 amBKK - ONT
2 stops24h 58mUnited Airlines
Deal found 4/30$805
This oojo deal was found by Cheapflights users on 4/30. 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.
Mon 9/111:10 pmONT - BKK
1 stop22h 50mSTARLUX Airlines
Mon 9/221:10 pmBKK - ONT
1 stop17h 55mSTARLUX Airlines
Deal found 4/30$819
This Korean Air deal was found by Cheapflights users on 4/30. 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.
Sat 11/17:00 amONT - BKK
2 stops26h 20mMultiple Airlines
Fri 11/211:00 amBKK - ONT
2 stops27h 18mMultiple Airlines
Deal found 4/30$849
This oojo deal was found by Cheapflights users on 4/30. 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.
Tue 11/410:45 pmONT - BKK
1 stop23h 20mChina Airlines
Mon 11/102:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 4/30$875
This oojo deal was found by Cheapflights users on 4/30. 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.
Mon 9/2911:39 amONT - BKK
2 stops28h 36mQatar Airways
Sun 2/88:10 amBKK - ONT
2 stops49h 07mQatar Airways
Deal found 4/30$968
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 5/512:10 amONT - DMK
1 stop21h 35mMultiple Airlines
Tue 5/132:45 amDMK - ONT
2 stops45h 17mMultiple Airlines
Deal found 4/29$1,225

Cheapflights Fare Finder

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 May 1, 2025.
Use the filters below to find and compare flights from Ontario to Bangkok that are best for you.

Fly from

Ontario

Fly to

Bangkok

Route

Depart

Return

Price

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/22

7:00 am-1:05 am

2 stops28h 05m

Bangkok Suvarnabhumi

Sun 10/19

2:35 am-11:46 pm

2 stops35h 11m

$777

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 5/13

6:00 am-11:40 pm

2 stops27h 40m

Bangkok Suvarnabhumi

Tue 5/20

9:40 pm-6:20 pm

2 stops34h 40m

$782

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 8/21

6:00 am-11:55 pm

2 stops27h 55m

Bangkok Suvarnabhumi

Wed 9/10

9:35 am-8:33 pm

2 stops24h 58m

$805

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/1

11:10 pm-12:00 pm

1 stop22h 50m

Bangkok Suvarnabhumi

Mon 9/22

1:10 pm-5:05 pm

1 stop17h 55m

$819

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 9/2

12:45 am-9:45 am

1 stop19h 00m

Bangkok Suvarnabhumi

Wed 9/24

1:20 pm-6:00 pm

1 stop18h 40m

$875

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 5/13

6:00 am-11:40 pm

2 stops27h 40m

Bangkok Suvarnabhumi

Sat 5/31

11:30 pm-6:20 pm

2 stops32h 50m

$957

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/1

6:00 am-6:15 am

2 stops34h 15m

Bangkok Suvarnabhumi

Mon 9/29

2:30 am-11:59 pm

2 stops35h 29m

$965

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 9/7

7:22 pm-10:50 am

2 stops25h 28m

Bangkok Suvarnabhumi

Sat 9/13

4:45 pm-11:59 pm

2 stops21h 14m

$1,073

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 10/14

11:00 pm-11:55 pm

2 stops34h 55m

Bangkok Suvarnabhumi

Thu 10/23

2:55 am-9:41 pm

2 stops32h 46m

$1,160

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Fri 9/5

12:45 am-11:45 am

1 stop21h 00m

Bangkok Don Mueang Intl

Sun 9/14

7:25 am-6:40 pm

1 stop25h 15m

$1,433

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 19 results
1
2

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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Bangkok

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 April 25, 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, March is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $955). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,574). 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 May 1, 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 May 1, 2025.
See what other customers who have flown with STARLUX Airlines, EVA Air and Korean Air 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.
STARLUX Airlines
9.1
Wonderful
161 reviews

Comfort

9.0

Boarding

9.0

Entertainment

9.0

Food

8.9

Crew

9.3

Overall

9.1

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
STARLUX Airlines
9.1
Wonderful
161 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Comfort

9.0

Boarding

9.0

Entertainment

9.0

Food

8.9

Crew

9.3

Overall

9.1

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
EVA Air
8.4
Very good
1,186 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Comfort

9.0

Boarding

9.0

Entertainment

9.0

Food

8.9

Crew

9.3

Overall

9.1

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
Korean Air
8.4
Very good
1,068 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Comfort

9.0

Boarding

9.0

Entertainment

9.0

Food

8.9

Crew

9.3

Overall

9.1

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
China Airlines
8.3
Very good
732 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Comfort

9.0

Boarding

9.0

Entertainment

9.0

Food

8.9

Crew

9.3

Overall

9.1

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
Delta
8.0
Very good
7,934 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Comfort

9.0

Boarding

9.0

Entertainment

9.0

Food

8.9

Crew

9.3

Overall

9.1

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.

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 $777 on this airline. Additional options worth looking into are Korean Air and United Airlines, starting at $782 and $805 round-trip. Delta is priced at 26% 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 United Airlines, with whom users have recently found tickets for as low as $418. However, be on the lookout for offers from Korean Air 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, March is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $955). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,574). 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.

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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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$785Average$871FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
DeltaCheapest$807Average$809FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$826Average$925FlexibilityNo cancel feeOn-time70%

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