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$356+ 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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Bangkok are usually found in October or September, booked 17 days in advance, depart on a Wednesday or Monday and return on a Wednesday

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 November 26, 2025.

This oojo deal was found by Cheapflights users on 11/24. 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.
Thu 11/2710:50 pmONT - BKK
1 stop35h 45mChina Airlines
Wed 12/242:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 11/24$733
This Korean Air deal was found by Cheapflights users on 11/24. 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.
Wed 11/266:45 amONT - BKK
2 stops23h 45mKorean Air
Wed 2/119:30 pmBKK - ONT
2 stops31h 24mKorean Air
Deal found 11/24$739
This FlightHub deal was found by Cheapflights users on 11/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2710:50 pmONT - BKK
1 stop23h 15mChina Airlines
Sun 12/72:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 11/25$740
This Delta deal was found by Cheapflights users on 11/25. 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.
Sat 11/296:00 amONT - BKK
2 stops27h 55mDelta
Fri 12/52:05 amBKK - ONT
2 stops35h 42mDelta
Deal found 11/25$744
This oojo deal was found by Cheapflights users on 11/24. 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 11/2510:50 pmONT - BKK
1 stop26h 55mChina Airlines
Tue 12/22:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 11/24$749
This United Airlines deal was found by Cheapflights users on 11/24. 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.
Sat 11/296:00 amONT - BKK
2 stops38h 25mUnited Airlines
Mon 2/94:55 pmBKK - ONT
2 stops20h 58mUnited Airlines
Deal found 11/24$750
This United Airlines deal was found by Cheapflights users on 11/24. 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.
Fri 11/288:38 pmONT - BKK
2 stops47h 47mUnited Airlines
Fri 12/54:55 pmBKK - ONT
2 stops34h 23mUnited Airlines
Deal found 11/24$756
This oojo deal was found by Cheapflights users on 11/25. 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.
Sun 11/3010:50 pmONT - BKK
1 stop35h 45mChina Airlines
Sun 12/75:50 pmBKK - ONT
1 stop38h 00mChina Airlines
Deal found 11/25$764
This Booking.com deal was found by Cheapflights users on 11/23. 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.
Wed 11/2610:50 pmONT - BKK
1 stop23h 15mChina Airlines
Mon 12/82:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 11/23$765
This FlightHub deal was found by Cheapflights users on 11/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2710:50 pmONT - BKK
1 stop20h 00mChina Airlines
Wed 12/32:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 11/26$771
This Delta deal was found by Cheapflights users on 11/24. 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.
Tue 11/256:45 amONT - BKK
2 stops27h 00mDelta
Thu 12/259:40 amBKK - ONT
2 stops22h 28mDelta
Deal found 11/24$772
This Delta deal was found by Cheapflights users on 11/24. 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.
Fri 11/286:45 amONT - BKK
2 stops27h 00mDelta
Wed 12/249:40 amBKK - ONT
2 stops22h 28mDelta
Deal found 11/24$774

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 November 26, 2025.

Round-trip from

$731
(Korean Air)

One-way from

$356
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$841
From Ontario to Bangkok
Search Deals
One-way flight from Ontario to Bangkok
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($81 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($42 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 26, 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 2/23

6:00 am-5:10 am

2 stops32h 10m

Bangkok Suvarnabhumi

Mon 3/2

4:55 pm-12:38 pm

2 stops34h 43m

$742

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 11/29

6:45 am-12:55 am

2 stops27h 10m

Bangkok Suvarnabhumi

Sat 12/6

2:05 am-11:58 pm

2 stops36h 53m

$744

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 2/19

7:30 am-12:55 am

2 stops26h 25m

Bangkok Suvarnabhumi

Fri 2/27

2:05 am-1:54 pm

2 stops26h 49m

$744

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 11/29

6:45 am-12:55 am

2 stops27h 10m

Bangkok Suvarnabhumi

Sun 12/7

2:05 am-10:47 pm

2 stops35h 42m

$744

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 2/14

3:30 pm-12:45 am

2 stops42h 15m

Bangkok Suvarnabhumi

Sat 2/28

2:05 am-10:37 pm

2 stops35h 32m

$745

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 11/29

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Fri 2/6

4:55 pm-12:17 pm

2 stops34h 22m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 1/23

6:39 pm-11:25 am

2 stops25h 46m

Bangkok Suvarnabhumi

Fri 2/6

4:55 pm-10:53 pm

2 stops20h 58m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 1/12

1:53 pm-11:25 am

2 stops30h 32m

Bangkok Suvarnabhumi

Mon 1/26

4:55 pm-5:43 pm

2 stops39h 48m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 2/10

6:00 am-12:20 am

2 stops27h 20m

Bangkok Suvarnabhumi

Sat 2/28

4:55 pm-10:57 pm

2 stops45h 02m

$751

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 1/8

6:39 pm-11:25 am

2 stops49h 46m

Bangkok Suvarnabhumi

Tue 1/20

4:55 pm-11:18 am

2 stops33h 23m

$756

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/24

Showing 1-10 of 41 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.

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 November 21, 2025.

Booking 17 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, April is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $486). Flying from Ontario to Bangkok in June is currently the most expensive (average of $786). 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 November 26, 2025.

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

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 November 26, 2025.
Read through reviews of airlines operating flights from Ontario to Bangkok, such as STARLUX Airlines, Korean Air, and China Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
8.9
Very good
235 reviews

Crew

9.2

Entertainment

8.9

Food

8.7

Boarding

9.0

Comfort

8.9

Overall

8.9

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
STARLUX Airlines
8.9
Very good
235 reviews
STARLUX Airlines
8.9
Very good
235 reviews

Crew

9.2

Entertainment

8.9

Food

8.7

Boarding

9.0

Comfort

8.9

Overall

8.9

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
Korean Air
8.4
Very good
1,170 reviews
STARLUX Airlines
8.9
Very good
235 reviews

Crew

9.2

Entertainment

8.9

Food

8.7

Boarding

9.0

Comfort

8.9

Overall

8.9

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
China Airlines
8.3
Very good
782 reviews
STARLUX Airlines
8.9
Very good
235 reviews

Crew

9.2

Entertainment

8.9

Food

8.7

Boarding

9.0

Comfort

8.9

Overall

8.9

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them

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 3 different airlines.

  • How long is the flight from Ontario to Bangkok?

    For as low as $744, United Airlines can have you in Bangkok from Ontario in 27h 10m. Airlines will cover a distance of 8280 mi. This flight may include one or multiple stops.

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

    Our cheapest airline available from Ontario to Bangkok is Korean Air. Our recent data shows that you can find tickets from as low as $637 on this airline. Additional options worth looking into are China Airlines and STARLUX Airlines, starting at $737 and $787 round-trip. Korean Air is priced at 36% lower than the current average price of a flight leaving 3 months from now.

  • 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, April is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $486). Flying from Ontario to Bangkok in June is currently the most expensive (average of $786). 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

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Top 3 airlines flying from Ontario to Bangkok

Discover the top 3 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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$637Average$818FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$737Average$896FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$787Average$832FlexibilityNo cancel feeOn-timeN/A

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