Bangkok

$340+ 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 7/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Apr 22 — Apr 291
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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 March 23, 2026.

This lol.travel deal was found by Cheapflights users on 3/21. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/277:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Tue 5/129:40 pm
BKK
-
ONT
2 stops33h 30m
Korean Air
Deal found 3/21$687
This lol.travel deal was found by Cheapflights users on 3/22. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/277:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Wed 5/1311:30 pm
BKK
-
ONT
2 stops31h 40m
Korean Air
Deal found 3/22$692
This Delta deal was found by Cheapflights users on 3/22. 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 4/267:00 am
ONT
-
BKK
2 stops24h 45m
Delta
Tue 5/199:50 am
BKK
-
ONT
2 stops21h 20m
Delta
Deal found 3/22$710
This Korean Air deal was found by Cheapflights users on 3/22. 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 4/217:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Tue 5/1211:30 pm
BKK
-
ONT
2 stops31h 40m
Korean Air
Deal found 3/22$715
This Delta deal was found by Cheapflights users on 3/22. 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 9/97:00 am
ONT
-
BKK
2 stops28h 05m
Delta
Sat 9/1911:30 pm
BKK
-
ONT
2 stops38h 14m
Delta
Deal found 3/22$722
This Korean Air deal was found by Cheapflights users on 3/22. 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 9/97:00 am
ONT
-
BKK
2 stops26h 35m
Korean Air
Sat 9/1911:30 pm
BKK
-
ONT
2 stops31h 46m
Korean Air
Deal found 3/22$727
This Trip.com deal was found by Cheapflights users on 3/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/267:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Tue 5/129:50 am
BKK
-
ONT
2 stops21h 20m
Korean Air
Deal found 3/21$728
This SmartFares deal was found by Cheapflights users on 3/20. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2012:10 am
ONT
-
BKK
1 stop22h 00m
China Airlines
Wed 11/42:05 pm
BKK
-
ONT
1 stop17h 45m
China Airlines
Deal found 3/20$749
This SmartFares deal was found by Cheapflights users on 3/20. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/812:45 am
ONT
-
BKK
1 stop21h 25m
China Airlines
Tue 9/221:20 pm
BKK
-
ONT
1 stop18h 40m
China Airlines
Deal found 3/20$750
This SmartFares deal was found by Cheapflights users on 3/22. 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.
Wed 9/1612:10 am
ONT
-
BKK
1 stop26h 10m
China Airlines
Sun 9/2710:50 am
BKK
-
ONT
1 stop21h 10m
China Airlines
Deal found 3/22$752
This Rumbo deal was found by Cheapflights users on 3/20. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3012:10 am
ONT
-
BKK
1 stop19h 35m
China Airlines
Wed 10/211:20 pm
BKK
-
ONT
1 stop18h 40m
China Airlines
Deal found 3/20$758
This Mytrip deal was found by Cheapflights users on 3/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2912:10 am
ONT
-
DMK
2 stops32h 55m
Multiple Airlines
Fri 5/87:30 am
DMK
-
ONT
2 stops24h 30m
Multiple Airlines
Deal found 3/20$1,042

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 March 23, 2026.

Round-trip from

$687
(lol.travel)

One-way from

$340
(iWofly)

Popular in

December

Cheapest in

January

Average price

$797
From Ontario to Bangkok
One-way flight from Ontario to Bangkok
Highest demand for flights based on searches. 5% potential increase in price ($55 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($44 potential savings vs. average RT price).
Average for round-trip flights in March 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 March 23, 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

Mon 4/27

6:00 am-11:35 pm

2 stops27h 35m

Bangkok Suvarnabhumi

Fri 5/8

9:50 am-5:10 pm

2 stops21h 20m

$819

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 5/1

12:10 am-9:45 am

1 stop19h 35m

Bangkok Suvarnabhumi

Wed 5/6

2:40 am-6:00 pm

1 stop29h 20m

$842

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 7/7

7:00 am-1:05 am

2 stops28h 05m

Bangkok Suvarnabhumi

Mon 7/20

2:35 am-10:40 pm

2 stops34h 05m

$861
Quickest round-trip

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 4/11

12:10 am-9:45 am

1 stop19h 35m

Bangkok Suvarnabhumi

Mon 5/11

10:50 am-6:00 pm

1 stop21h 10m

$911

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 5/9

12:10 am-1:20 pm

2 stops23h 10m

Bangkok Suvarnabhumi

Sun 5/31

5:30 pm-6:00 pm

1 stop38h 30m

$962

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 5/3

12:10 am-4:20 pm

1 stop26h 10m

Bangkok Suvarnabhumi

Mon 6/15

5:50 pm-6:00 pm

2 stops38h 10m

$967

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 9/13

12:45 am-1:20 pm

2 stops22h 35m

Bangkok Suvarnabhumi

Thu 9/17

10:50 am-6:00 pm

1 stop21h 10m

$987

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 7/7

7:00 am-1:05 am

2 stops28h 05m

Bangkok Suvarnabhumi

Sat 7/18

9:40 pm-5:16 pm

2 stops33h 36m

$1,005

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 4/23

6:00 am-9:35 am

2 stops37h 35m

Bangkok Suvarnabhumi

Thu 4/30

9:35 am-10:59 pm

2 stops51h 24m

$1,059

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 4/12

6:00 am-9:45 pm

2 stops25h 45m

Bangkok Suvarnabhumi

Thu 5/7

11:30 pm-5:10 pm

2 stops31h 40m

$1,062

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 45 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?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Bangkok. Price data was last updated on March 13, 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 $503). Flying from Ontario to Bangkok in June is currently the most expensive (average of $748). 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 March 23, 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

8.7

Crew

9.2

Overall

9.0

Entertainment

8.8

Boarding

9.0

Comfort

8.9

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.

Food

8.7

Crew

9.2

Overall

9.0

Entertainment

8.8

Boarding

9.0

Comfort

8.9

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.

Food

8.7

Crew

9.2

Overall

9.0

Entertainment

8.8

Boarding

9.0

Comfort

8.9

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.

Food

8.7

Crew

9.2

Overall

9.0

Entertainment

8.8

Boarding

9.0

Comfort

8.9

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.

Food

8.7

Crew

9.2

Overall

9.0

Entertainment

8.8

Boarding

9.0

Comfort

8.9

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 4 different airlines.

  • How long is the flight from Ontario to Bangkok?

    For as low as $842, Delta can have you in Bangkok from Ontario in 19h 35m. 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 $718 round-trip. Delta is priced at 51% 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, January is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $503). Flying from Ontario to Bangkok in June is currently the most expensive (average of $748). 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 March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$457Average$660FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$616Average$783FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$718Average$837FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$763Average$815FlexibilityNo cancel feeOn-timeN/A

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