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$366+ 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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Dec 20 — Dec 271
Sat 12/20
Sat 12/27
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Bangkok are usually found in August or October, 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 20, 2025.

This oojo deal was found by Cheapflights users on 11/18. 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 11/2410:50 pmONT - BKK
1 stop35h 45mChina Airlines
Thu 12/410:55 amBKK - ONT
1 stop20h 55mChina Airlines
Deal found 11/18$734
This FlightHub deal was found by Cheapflights users on 11/19. 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
Mon 12/810:55 amBKK - ONT
1 stop20h 55mChina Airlines
Deal found 11/19$740
This Gotogate deal was found by Cheapflights users on 11/20. 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.
Fri 11/2810:50 pmONT - BKK
1 stop26h 55mChina Airlines
Tue 12/162:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 11/20$744
This oojo deal was found by Cheapflights users on 11/19. 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.
Fri 11/2810:50 pmONT - BKK
1 stop35h 45mChina Airlines
Fri 12/122:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 11/19$745
This Gotogate deal was found by Cheapflights users on 11/18. 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.
Wed 11/2610:50 pmONT - BKK
1 stop35h 45mChina Airlines
Sat 1/2410:55 amBKK - ONT
1 stop20h 55mChina Airlines
Deal found 11/18$746
This oojo deal was found by Cheapflights users on 11/20. 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 stop23h 15mChina Airlines
Tue 12/22:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 11/20$749
This United Airlines deal was found by Cheapflights users on 11/19. 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 11/266:00 amONT - BKK
2 stops38h 25mUnited Airlines
Wed 12/34:55 pmBKK - ONT
2 stops39h 42mUnited Airlines
Deal found 11/19$750
This Gotogate deal was found by Cheapflights users on 11/20. 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.
Fri 11/2810:50 pmONT - BKK
1 stop23h 15mChina Airlines
Tue 12/910:55 amBKK - ONT
1 stop20h 55mChina Airlines
Deal found 11/20$754
This CheapOair deal was found by Cheapflights users on 11/19. 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 CheapOair 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
Fri 12/55:50 pmBKK - ONT
1 stop38h 00mChina Airlines
Deal found 11/19$755
This United Airlines deal was found by Cheapflights users on 11/18. 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.
Mon 11/246:38 pmONT - BKK
2 stops49h 47mUnited Airlines
Thu 12/44:55 pmBKK - ONT
2 stops20h 54mUnited Airlines
Deal found 11/18$756
This Kiwi.com deal was found by Cheapflights users on 11/18. 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.
Wed 11/2610:50 pmONT - DMK
1 stop22h 00mMultiple Airlines
Sat 1/247:30 amDMK - ONT
2 stops23h 20mMultiple Airlines
Deal found 11/18$1,173
This Kiwi.com deal was found by Cheapflights users on 11/18. 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.
Wed 12/106:00 amONT - DMK
2 stops41h 45mMultiple Airlines
Tue 1/207:45 amDMK - ONT
1 stop24h 05mMultiple Airlines
Deal found 11/18$1,195

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 20, 2025.

Round-trip from

$732
(Gotogate)

One-way from

$366
(Delta)

Popular in

December

Cheapest in

August

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. 8% potential increase in price ($98 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($41 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 20, 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

Thu 1/15

6:39 pm-11:25 am

2 stops49h 46m

Bangkok Suvarnabhumi

Tue 5/26

9:35 am-11:06 pm

2 stops51h 31m

$736

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 3/30

6:45 am-11:40 pm

2 stops26h 55m

Bangkok Suvarnabhumi

Wed 4/8

9:40 pm-5:15 pm

2 stops33h 35m

$740

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 1/19

7:30 am-12:55 am

2 stops26h 25m

Bangkok Suvarnabhumi

Sun 3/1

2:05 am-1:56 pm

2 stops26h 51m

$745

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 2/14

3:30 pm-12:55 am

2 stops42h 25m

Bangkok Suvarnabhumi

Sun 3/1

9:30 pm-10:40 pm

2 stops40h 10m

$745

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 1/10

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Fri 1/23

4:55 pm-12:17 pm

2 stops34h 22m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 2/10

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Tue 3/3

4:55 pm-12:38 pm

2 stops34h 43m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 2/5

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Thu 2/26

4:55 pm-10:57 pm

2 stops21h 02m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 1/11

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Fri 1/23

4:55 pm-12:17 pm

2 stops34h 22m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 2/23

6:00 am-5:10 am

2 stops56h 10m

Bangkok Suvarnabhumi

Fri 2/27

4:55 pm-5:41 pm

2 stops39h 46m

$754

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 1/15

1:53 pm-11:25 am

2 stops54h 32m

Bangkok Suvarnabhumi

Tue 1/27

4:55 pm-10:53 pm

2 stops20h 58m

$756

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 39 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 14, 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 $785). 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 20, 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.

How much does it cost to fly round-trip from Ontario to Bangkok?

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 20, 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
232 reviews

Comfort

8.9

Entertainment

8.9

Food

8.7

Crew

9.2

Boarding

9.0

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
232 reviews
STARLUX Airlines
8.9
Very good
232 reviews

Comfort

8.9

Entertainment

8.9

Food

8.7

Crew

9.2

Boarding

9.0

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
232 reviews

Comfort

8.9

Entertainment

8.9

Food

8.7

Crew

9.2

Boarding

9.0

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
232 reviews

Comfort

8.9

Entertainment

8.9

Food

8.7

Crew

9.2

Boarding

9.0

Overall

8.9

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
United Airlines
7.4
Good
9,029 reviews
STARLUX Airlines
8.9
Very good
232 reviews

Comfort

8.9

Entertainment

8.9

Food

8.7

Crew

9.2

Boarding

9.0

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 4 different airlines.

  • How long is the flight from Ontario to Bangkok?

    For as low as $745, United Airlines can have you in Bangkok from Ontario in 26h 25m. 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 $732 on this airline. Additional options worth looking into are China Airlines and United Airlines, starting at $756 and $778 round-trip. Korean Air is priced at 27% 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 $785). 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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See prices for flight routes from nearby airports that may be better suited for you.
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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 November 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$732Average$833FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$756Average$912FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$778Average$854FlexibilityNo cancel feeOn-time69%
STARLUX AirlinesCheapest$787Average$825FlexibilityNo cancel feeOn-timeN/A

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