Bangkok

$427+ 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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
May 24 — May 311
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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 April 24, 2026.

This SmartFares deal was found by Cheapflights users on 4/19. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/247:00 am
ONT
-
BKK
2 stops25h 20m
Korean Air
Mon 12/711:15 pm
BKK
-
ONT
2 stops33h 02m
Korean Air
Deal found 4/19$887
This Korean Air deal was found by Cheapflights users on 4/20. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Mon 5/252:35 am
BKK
-
ONT
2 stops28h 35m
Korean Air
Deal found 4/20$925
This Delta deal was found by Cheapflights users on 4/21. 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.
Mon 11/26:00 am
ONT
-
BKK
2 stops24h 30m
Delta
Wed 11/259:40 am
BKK
-
ONT
2 stops22h 37m
Delta
Deal found 4/21$932
This Korean Air deal was found by Cheapflights users on 4/20. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/177:00 am
ONT
-
BKK
2 stops23h 30m
Korean Air
Tue 11/2412:55 am
BKK
-
ONT
2 stops31h 22m
Korean Air
Deal found 4/20$937
This Delta deal was found by Cheapflights users on 4/21. 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.
Sun 8/91:00 pm
ONT
-
BKK
2 stops46h 05m
Delta
Tue 11/1712:55 am
BKK
-
ONT
2 stops31h 22m
Delta
Deal found 4/21$938
This Delta deal was found by Cheapflights users on 4/21. 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.
Thu 11/126:00 am
ONT
-
BKK
2 stops24h 30m
Delta
Tue 12/19:40 am
BKK
-
ONT
2 stops40h 36m
Delta
Deal found 4/21$939
This Delta deal was found by Cheapflights users on 4/21. 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 11/115:05 pm
ONT
-
BKK
2 stops37h 25m
Delta
Tue 12/19:40 am
BKK
-
ONT
2 stops40h 36m
Delta
Deal found 4/21$945
This Delta deal was found by Cheapflights users on 4/21. 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 11/1011:55 am
ONT
-
BKK
2 stops66h 35m
Delta
Tue 12/19:40 am
BKK
-
ONT
2 stops40h 36m
Delta
Deal found 4/21$946
This Delta deal was found by Cheapflights users on 4/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
-
BKK
2 stops27h 35m
Delta
Wed 5/2011:30 pm
BKK
-
ONT
2 stops31h 40m
Delta
Deal found 4/19$955
This Delta deal was found by Cheapflights users on 4/21. 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 5/56:00 am
ONT
-
BKK
2 stops27h 35m
Delta
Thu 6/119:50 am
BKK
-
ONT
2 stops21h 29m
Delta
Deal found 4/21$956
This Delta deal was found by Cheapflights users on 4/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/317:00 am
ONT
-
BKK
2 stops24h 45m
Delta
Wed 9/239:50 am
BKK
-
ONT
2 stops26h 50m
Delta
Deal found 4/20$958
This Korean Air deal was found by Cheapflights users on 4/21. 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 7/226:20 am
ONT
-
BKK
2 stops25h 25m
Korean Air
Tue 8/252:35 am
BKK
-
ONT
2 stops28h 41m
Korean Air
Deal found 4/21$963

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 April 24, 2026.

Round-trip from

$932
(Delta)

One-way from

$427
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$839
From Ontario to Bangkok
One-way flight from Ontario to Bangkok
Highest demand for flights based on searches. 4% potential increase in price ($44 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).
Average for round-trip flights in April 2026

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 April 24, 2026.
Use the filters below to find and compare flights from Ontario to Bangkok that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 10/18

5:50 pm-1:05 am

2 stops41h 15m

Bangkok Suvarnabhumi

Sun 11/8

12:55 am-5:17 pm

2 stops31h 22m

$937

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 5/5

6:00 am-11:35 pm

2 stops27h 35m

Bangkok Suvarnabhumi

Mon 5/18

11:30 pm-5:10 pm

2 stops31h 40m

$955

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 7/22

6:20 am-11:35 pm

2 stops27h 15m

Bangkok Suvarnabhumi

Tue 8/25

2:35 am-5:16 pm

2 stops28h 41m

$1,012

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 10/6

12:00 pm-6:20 am

2 stops28h 20m

Bangkok Suvarnabhumi

Mon 10/19

2:30 am-6:13 pm

2 stops29h 43m

$1,227

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 10/7

12:00 pm-6:20 am

2 stops28h 20m

Bangkok Suvarnabhumi

Tue 10/27

2:00 am-6:13 pm

2 stops30h 13m

$1,228

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Wed 5/13

12:10 am-7:30 pm

1 stop29h 20m

Bangkok Don Mueang Intl

Wed 5/20

7:25 am-6:00 pm

1 stop24h 35m

$1,295

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Mon 5/11

12:10 am-7:30 pm

1 stop29h 20m

Bangkok Don Mueang Intl

Mon 5/18

7:25 am-6:00 pm

1 stop24h 35m

$1,296
Quickest round-trip

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Mon 5/4

12:10 am-1:05 pm

2 stops22h 55m

Bangkok Don Mueang Intl

Tue 5/12

6:45 am-6:00 pm

2 stops25h 15m

$1,301

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 10/19

12:00 pm-6:20 am

2 stops28h 20m

Bangkok Suvarnabhumi

Thu 10/29

2:00 am-6:13 pm

2 stops30h 13m

$1,308

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 5/9

5:55 pm-11:35 pm

2 stops39h 40m

Bangkok Suvarnabhumi

Tue 8/25

2:35 am-12:49 pm

2 stops48h 14m

$1,310

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/19

Showing 1-10 of 42 resultsSorted by cheapest first
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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?

Booking 81 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, July is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $457). Flying from Ontario to Bangkok in June is currently the most expensive (average of $906). 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.

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 April 24, 2026.
Read through reviews of airlines operating flights from Ontario to Bangkok, such as STARLUX Airlines,Korean Air, andChina Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Food

8.6

Entertainment

8.8

Boarding

8.9

Comfort

8.9

Crew

9.2

Overall

8.9

Reviews

1 / 11
8.0
Excellent

Anonymous,Apr 2026

PHX - TPE

After about 10 hours the seat turns into a 2 x4! Maybe pitch the front up 1-2 degrees so the posterior occupies the whole surface instead of sliding out forward--you would think it would be more comfortable.

Food

8.6

Entertainment

8.8

Boarding

8.9

Comfort

8.9

Crew

9.2

Overall

8.9

Reviews

1 / 11
8.0
Excellent

Anonymous,Apr 2026

PHX - TPE

After about 10 hours the seat turns into a 2 x4! Maybe pitch the front up 1-2 degrees so the posterior occupies the whole surface instead of sliding out forward--you would think it would be more comfortable.

Food

8.6

Entertainment

8.8

Boarding

8.9

Comfort

8.9

Crew

9.2

Overall

8.9

Reviews

1 / 11
8.0
Excellent

Anonymous,Apr 2026

PHX - TPE

After about 10 hours the seat turns into a 2 x4! Maybe pitch the front up 1-2 degrees so the posterior occupies the whole surface instead of sliding out forward--you would think it would be more comfortable.

Food

8.6

Entertainment

8.8

Boarding

8.9

Comfort

8.9

Crew

9.2

Overall

8.9

Reviews

1 / 11
8.0
Excellent

Anonymous,Apr 2026

PHX - TPE

After about 10 hours the seat turns into a 2 x4! Maybe pitch the front up 1-2 degrees so the posterior occupies the whole surface instead of sliding out forward--you would think it would be more comfortable.

Food

8.6

Entertainment

8.8

Boarding

8.9

Comfort

8.9

Crew

9.2

Overall

8.9

Reviews

1 / 11
8.0
Excellent

Anonymous,Apr 2026

PHX - TPE

After about 10 hours the seat turns into a 2 x4! Maybe pitch the front up 1-2 degrees so the posterior occupies the whole surface instead of sliding out forward--you would think it would be more comfortable.

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 $1,227, Delta can have you in Bangkok from Ontario in 28h 20m. 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 Delta. Our recent data shows that you can find tickets from as low as $457 on this airline. Additional options worth looking into are Korean Air and China Airlines, starting at $616 and $717 round-trip. Delta is priced at 52% 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 $316. 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, July is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $457). Flying from Ontario to Bangkok in June is currently the most expensive (average of $906). 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 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 April 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$457Average$660FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$616Average$783FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$717Average$834FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$763Average$819FlexibilityNo cancel feeOn-timeN/A

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