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$309+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Feb 10 — Feb 171
Tue 2/10
Tue 2/17
1 adult, Economy
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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 January 11, 2026.

Round-trip from

$722
(United Airlines)

One-way from

$309
(iWofly)

Popular in

December

Cheapest in

January

Average price

$769
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. 4% potential increase in price ($48 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 11, 2026.

This United Airlines deal was found by Cheapflights users on 1/10. 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 8/116:53 pmONT - BKK
2 stops43h 42mUnited Airlines
Tue 8/257:00 amBKK - ONT
2 stops24h 47mUnited Airlines
Deal found 1/10$719
This United Airlines deal was found by Cheapflights users on 1/9. 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 8/116:00 amONT - BKK
2 stops27h 55mUnited Airlines
Thu 8/277:00 amBKK - ONT
2 stops24h 47mUnited Airlines
Deal found 1/9$722
This United Airlines deal was found by Cheapflights users on 1/9. 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 4/1511:05 amONT - BKK
2 stops32h 40mUnited Airlines
Thu 4/239:35 amBKK - ONT
2 stops27h 10mUnited Airlines
Deal found 1/9$723
This United Airlines deal was found by Cheapflights users on 1/8. 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 4/96:00 amONT - BKK
2 stops37h 45mUnited Airlines
Thu 4/239:35 amBKK - ONT
2 stops27h 10mUnited Airlines
Deal found 1/8$724
This United Airlines deal was found by Cheapflights users on 1/8. 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.
Sun 5/36:00 amONT - BKK
2 stops56h 35mUnited Airlines
Fri 5/159:35 amBKK - ONT
2 stops51h 17mUnited Airlines
Deal found 1/8$726
This United Airlines deal was found by Cheapflights users on 1/10. 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 4/276:49 pmONT - BKK
2 stops24h 56mUnited Airlines
Wed 6/107:00 amBKK - ONT
2 stops24h 47mUnited Airlines
Deal found 1/10$727
This United Airlines deal was found by Cheapflights users on 1/9. 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 4/176:45 pmONT - BKK
2 stops25h 00mUnited Airlines
Thu 4/239:35 amBKK - ONT
2 stops27h 10mUnited Airlines
Deal found 1/9$728
This United Airlines deal was found by Cheapflights users on 1/10. 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 4/186:49 pmONT - BKK
2 stops24h 56mUnited Airlines
Tue 4/289:35 amBKK - ONT
2 stops46h 12mUnited Airlines
Deal found 1/10$729
This United Airlines deal was found by Cheapflights users on 1/8. 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 5/111:05 amONT - BKK
2 stops51h 30mUnited Airlines
Fri 5/89:35 amBKK - ONT
2 stops27h 17mUnited Airlines
Deal found 1/8$730
This United Airlines deal was found by Cheapflights users on 1/9. 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 8/136:00 amONT - BKK
2 stops37h 45mUnited Airlines
Fri 8/217:00 amBKK - ONT
2 stops30h 06mUnited Airlines
Deal found 1/9$731
This United Airlines deal was found by Cheapflights users on 1/10. 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 4/106:00 amONT - BKK
2 stops37h 45mUnited Airlines
Wed 4/227:00 amBKK - ONT
2 stops29h 45mUnited Airlines
Deal found 1/10$732
This United Airlines deal was found by Cheapflights users on 1/11. 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 4/1711:05 amONT - BKK
2 stops32h 40mUnited Airlines
Sat 4/259:35 amBKK - ONT
2 stops27h 10mUnited Airlines
Deal found 1/11$733

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 January 11, 2026.
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

Wed 4/22

11:05 am-9:45 am

2 stops32h 40m

Bangkok Suvarnabhumi

Wed 5/20

9:35 am-10:52 pm

2 stops27h 17m

$724

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 4/10

6:00 am-9:45 am

2 stops37h 45m

Bangkok Suvarnabhumi

Mon 4/27

9:35 am-10:45 pm

2 stops27h 10m

$729

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 5/4

6:54 pm-9:45 am

2 stops24h 51m

Bangkok Suvarnabhumi

Sat 5/16

9:35 am-10:52 pm

2 stops27h 17m

$729

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 2/4

7:30 am-12:45 am

2 stops26h 15m

Bangkok Suvarnabhumi

Mon 2/23

9:40 am-10:37 pm

2 stops27h 57m

$736

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 2/25

7:30 am-12:45 am

2 stops26h 15m

Bangkok Suvarnabhumi

Fri 3/13

12:55 am-5:12 pm

2 stops30h 17m

$739

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 2/26

7:30 am-12:45 am

2 stops26h 15m

Bangkok Suvarnabhumi

Fri 3/13

12:55 am-5:12 pm

2 stops30h 17m

$739

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 3/29

6:00 am-11:40 pm

2 stops27h 40m

Bangkok Suvarnabhumi

Sun 4/12

9:50 am-5:15 pm

2 stops45h 25m

$739

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 3/28

6:37 pm-9:45 am

2 stops49h 08m

Bangkok Suvarnabhumi

Sat 4/25

9:35 am-10:45 pm

2 stops27h 10m

$739

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 3/2

6:10 am-5:10 am

2 stops32h 00m

Bangkok Suvarnabhumi

Thu 4/30

3:40 pm-10:52 pm

2 stops45h 12m

$740

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 4/3

6:00 am-11:40 pm

2 stops27h 40m

Bangkok Suvarnabhumi

Wed 4/15

11:30 pm-5:15 pm

2 stops31h 45m

$741

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/10

Showing 1-10 of 40 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 January 9, 2026.

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, January is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $511). Flying from Ontario to Bangkok in June is currently the most expensive (average of $781). 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.

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 January 11, 2026.
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
261 reviews

Overall

8.9

Boarding

8.9

Entertainment

8.8

Food

8.6

Comfort

8.8

Crew

9.1

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.
STARLUX Airlines
8.9
Very good
261 reviews
STARLUX Airlines
8.9
Very good
261 reviews

Overall

8.9

Boarding

8.9

Entertainment

8.8

Food

8.6

Comfort

8.8

Crew

9.1

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.
Korean Air
8.4
Very good
1,188 reviews
STARLUX Airlines
8.9
Very good
261 reviews

Overall

8.9

Boarding

8.9

Entertainment

8.8

Food

8.6

Comfort

8.8

Crew

9.1

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.
China Airlines
8.3
Very good
798 reviews
STARLUX Airlines
8.9
Very good
261 reviews

Overall

8.9

Boarding

8.9

Entertainment

8.8

Food

8.6

Comfort

8.8

Crew

9.1

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.

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 $724, United Airlines can have you in Bangkok from Ontario in 37h 45m. 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 $718 and $763 round-trip. Korean Air is priced at 34% 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, January is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $511). Flying from Ontario to Bangkok in June is currently the most expensive (average of $781). 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 January 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$637Average$793FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$718Average$877FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$731Average$822FlexibilityNo cancel feeOn-timeN/A

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