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$313+ 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 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Bangkok are usually found in January or October, booked 84 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap 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 December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/17. 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 12/2510:42 amONT - BKK
2 stops51h 28mUnited Airlines
Sun 4/269:35 amBKK - ONT
2 stops46h 12mUnited Airlines
Deal found 12/17$836
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/316:00 amONT - BKK
2 stops38h 25mUnited Airlines
Tue 1/204:55 pmBKK - ONT
2 stops39h 48mUnited Airlines
Deal found 12/16$967
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Tue 12/306:39 pmONT - BKK
2 stops49h 46mUnited Airlines
Thu 1/224:55 pmBKK - ONT
2 stops20h 58mUnited Airlines
Deal found 12/16$973
This oojo deal was found by Cheapflights users on 12/17. 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 12/3110:50 pmONT - BKK
1 stop20h 00mChina Airlines
Sun 2/155:50 pmBKK - ONT
1 stop38h 00mChina Airlines
Deal found 12/17$989
This oojo deal was found by Cheapflights users on 12/16. 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 12/3110:50 pmONT - BKK
1 stop20h 00mChina Airlines
Tue 1/202:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 12/16$991
This oojo deal was found by Cheapflights users on 12/16. 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 12/2910:50 pmONT - BKK
1 stop26h 55mChina Airlines
Thu 1/222:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 12/16$1,007
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/295:05 amONT - BKK
2 stops28h 15mUnited Airlines
Sat 1/34:55 pmBKK - ONT
2 stops20h 46mUnited Airlines
Deal found 12/16$1,112
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/316:00 amONT - BKK
2 stops38h 25mUnited Airlines
Sun 2/154:55 pmBKK - ONT
2 stops21h 02mUnited Airlines
Deal found 12/17$1,113
This China Airlines deal was found by Cheapflights users on 12/17. 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 China Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:50 pmONT - BKK
1 stop26h 55mChina Airlines
Fri 1/162:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 12/17$1,144
This China Airlines deal was found by Cheapflights users on 12/15. 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 China Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:50 pmONT - BKK
1 stop23h 15mChina Airlines
Mon 1/122:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 12/15$1,184
This FlightHub deal was found by Cheapflights users on 12/17. 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.
Fri 12/2610:50 pmONT - BKK
1 stop35h 45mChina Airlines
Mon 1/195:50 pmBKK - ONT
1 stop38h 00mChina Airlines
Deal found 12/17$1,200
This China Airlines deal was found by Cheapflights users on 12/17. 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 China Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2710:50 pmONT - BKK
1 stop35h 45mChina Airlines
Thu 1/1510:55 amBKK - ONT
1 stop20h 55mChina Airlines
Deal found 12/17$1,204

Find 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 December 18, 2025.

Round-trip from

$723
(United Airlines)

One-way from

$313
(Delta)

Popular in

December

Cheapest in

January

Average price

$1,456
From Ontario to Bangkok
Search Deals
One-way flight from Ontario to Bangkok
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 December 18, 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 1/1

6:39 pm-5:10 am

2 stops43h 31m

Bangkok Suvarnabhumi

Sat 1/10

7:10 am-5:51 pm

2 stops25h 41m

$732

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 3/3

7:30 am-11:20 pm

2 stops24h 50m

Bangkok Suvarnabhumi

Sun 4/12

9:40 pm-5:16 pm

2 stops33h 36m

$734

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 1/28

1:53 pm-11:25 am

2 stops30h 32m

Bangkok Suvarnabhumi

Mon 3/9

4:55 pm-5:41 pm

2 stops38h 46m

$742

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 2/28

6:10 am-5:10 am

2 stops32h 00m

Bangkok Suvarnabhumi

Thu 3/12

4:55 pm-10:57 pm

2 stops20h 02m

$743

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 3/10

6:00 am-11:20 pm

2 stops27h 20m

Bangkok Suvarnabhumi

Sun 4/5

9:40 pm-5:13 pm

2 stops33h 33m

$744

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 3/17

6:00 am-11:25 am

2 stops39h 25m

Bangkok Suvarnabhumi

Tue 4/14

3:40 pm-11:06 pm

2 stops21h 26m

$751

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 1/9

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Fri 1/23

4:55 pm-10:53 pm

2 stops20h 58m

$751

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 1/17

10:50 pm-1:35 am

1 stop35h 45m

Bangkok Suvarnabhumi

Sun 2/1

2:35 am-4:50 pm

1 stop29h 15m

$777

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 1/17

10:50 pm-1:35 am

1 stop35h 45m

Bangkok Suvarnabhumi

Tue 2/3

2:35 am-4:50 pm

1 stop29h 15m

$777

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 3/7

10:50 pm-4:45 pm

1 stop26h 55m

Bangkok Suvarnabhumi

Wed 4/8

1:20 pm-6:00 pm

1 stop18h 40m

$777

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

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 December 12, 2025.

Booking 83 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 $782). 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 December 18, 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 December 18, 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
245 reviews

Entertainment

8.8

Food

8.7

Boarding

8.9

Comfort

8.8

Crew

9.2

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
245 reviews
STARLUX Airlines
8.9
Very good
245 reviews

Entertainment

8.8

Food

8.7

Boarding

8.9

Comfort

8.8

Crew

9.2

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
1,186 reviews
STARLUX Airlines
8.9
Very good
245 reviews

Entertainment

8.8

Food

8.7

Boarding

8.9

Comfort

8.8

Crew

9.2

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
792 reviews
STARLUX Airlines
8.9
Very good
245 reviews

Entertainment

8.8

Food

8.7

Boarding

8.9

Comfort

8.8

Crew

9.2

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 $734, United Airlines can have you in Bangkok from Ontario in 24h 50m. 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 $722 and $763 round-trip. Korean Air is priced at 35% 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 Korean Air, with whom users have recently found tickets for as low as $378. However, be on the lookout for offers from China Airlines and STARLUX Airlines, 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, 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 $782). 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$637Average$805FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$722Average$902FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$763Average$825FlexibilityNo cancel feeOn-timeN/A

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