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$361+ 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Bangkok are usually found in August or September, booked 67 days in advance, depart on a Wednesday or Monday and return on a Wednesday

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 septiembre 17, 2025.

Round-trip from

$701
(SmartFares)

One-way from

$361
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$825
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. 9% potential increase in price ($105 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 septiembre 17, 2025.

This SmartFares deal was found by Cheapflights users on 9/14. 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.
mar. 12/26:40 amONT - BKK
2 stops25h 40mKorean Air
lun. 1/1912:55 amBKK - ONT
2 stops36h 43mKorean Air
Deal found 9/14$701
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/196:00 amONT - BKK
2 stops25h 45mDelta
mié. 10/229:50 amBKK - ONT
2 stops26h 51mDelta
Deal found 9/15$710
This Korean Air deal was found by Cheapflights users on 9/15. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/56:00 amONT - BKK
2 stops29h 05mKorean Air
sáb. 11/2211:15 pmBKK - ONT
2 stops32h 54mKorean Air
Deal found 9/15$715
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/189:50 amONT - BKK
2 stops47h 35mDelta
vie. 10/319:40 amBKK - ONT
2 stops27h 01mDelta
Deal found 9/15$716
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/266:36 pmONT - BKK
2 stops43h 59mUnited Airlines
mar. 10/149:35 amBKK - ONT
2 stops46h 05mUnited Airlines
Deal found 9/15$724
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/166:00 amONT - BKK
2 stops32h 35mUnited Airlines
dom. 9/217:00 amBKK - ONT
2 stops24h 29mUnited Airlines
Deal found 9/15$727
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/175:10 amONT - BKK
2 stops28h 45mUnited Airlines
jue. 9/257:00 amBKK - ONT
2 stops27h 24mUnited Airlines
Deal found 9/15$730
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/156:50 pmONT - BKK
2 stops43h 45mUnited Airlines
dom. 9/217:00 amBKK - ONT
2 stops27h 43mUnited Airlines
Deal found 9/15$733
This United Airlines deal was found by Cheapflights users on 9/16. 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.
mar. 9/166:00 amONT - BKK
2 stops32h 35mUnited Airlines
vie. 10/314:55 pmBKK - ONT
2 stops19h 56mUnited Airlines
Deal found 9/16$743
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/166:00 amONT - BKK
2 stops38h 25mUnited Airlines
dom. 2/154:55 pmBKK - ONT
2 stops34h 23mUnited Airlines
Deal found 9/15$750
This United Airlines deal was found by Cheapflights users on 9/16. 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.
dom. 11/236:38 pmONT - BKK
2 stops25h 47mUnited Airlines
jue. 12/44:55 pmBKK - ONT
2 stops20h 54mUnited Airlines
Deal found 9/16$751
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/36:38 pmONT - BKK
2 stops49h 47mUnited Airlines
dom. 11/164:55 pmBKK - ONT
2 stops20h 56mUnited Airlines
Deal found 9/15$756

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 septiembre 17, 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

dom. 10/5

6:00 am-1:05 am

2 stops29h 05m

Bangkok Suvarnabhumi

sáb. 11/22

11:15 pm-5:09 pm

2 stops32h 54m

$715

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

mié. 11/19

6:45 am-11:20 pm

2 stops25h 35m

Bangkok Suvarnabhumi

mar. 1/27

12:55 am-10:38 pm

2 stops36h 43m

$715

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

lun. 3/2

6:45 am-9:30 pm

2 stops23h 45m

Bangkok Suvarnabhumi

jue. 3/12

11:15 pm-5:15 pm

2 stops32h 00m

$715

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

mié. 11/5

1:45 pm-11:25 am

2 stops30h 40m

Bangkok Suvarnabhumi

mar. 11/11

4:55 pm-10:51 pm

2 stops20h 56m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

jue. 1/22

1:53 pm-11:25 am

2 stops30h 32m

Bangkok Suvarnabhumi

vie. 1/30

4:55 pm-10:53 pm

2 stops20h 58m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

mié. 1/7

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

sáb. 1/17

4:55 pm-10:53 pm

2 stops20h 58m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

lun. 2/2

1:53 pm-11:25 am

2 stops30h 32m

Bangkok Suvarnabhumi

dom. 2/15

4:55 pm-10:57 pm

2 stops21h 02m

$751

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

vie. 11/7

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

lun. 11/24

4:55 pm-5:34 pm

2 stops39h 39m

$751

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

jue. 10/30

1:40 pm-11:25 am

2 stops31h 45m

Bangkok Suvarnabhumi

jue. 11/6

4:55 pm-10:51 pm

2 stops20h 56m

$751

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

dom. 11/23

1:40 pm-11:25 am

2 stops30h 45m

Bangkok Suvarnabhumi

lun. 12/15

4:55 pm-10:49 pm

2 stops20h 54m

$751

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 47 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 September 12, 2025.

Booking 67 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, September is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $900). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,507). 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 septiembre 17, 2025.

It’s typically best to fly out from Ontario to Bangkok in the morning. 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 septiembre 17, 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
215 reviews

Entertainment

8.9

Food

8.8

Overall

8.9

Comfort

8.9

Crew

9.2

Boarding

9.0

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
STARLUX Airlines
8.9
Very good
215 reviews
STARLUX Airlines
8.9
Very good
215 reviews

Entertainment

8.9

Food

8.8

Overall

8.9

Comfort

8.9

Crew

9.2

Boarding

9.0

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
Korean Air
8.4
Very good
1,140 reviews
STARLUX Airlines
8.9
Very good
215 reviews

Entertainment

8.9

Food

8.8

Overall

8.9

Comfort

8.9

Crew

9.2

Boarding

9.0

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
China Airlines
8.3
Very good
768 reviews
STARLUX Airlines
8.9
Very good
215 reviews

Entertainment

8.9

Food

8.8

Overall

8.9

Comfort

8.9

Crew

9.2

Boarding

9.0

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!
United Airlines
7.4
Good
8,926 reviews
STARLUX Airlines
8.9
Very good
215 reviews

Entertainment

8.9

Food

8.8

Overall

8.9

Comfort

8.9

Crew

9.2

Boarding

9.0

Reviews

1 / 8
10.0
Excellent

Anonymous,Sep 2025

TPE - CRK

Superb service! My second time flying with Starlux to Clark. Will definately fly this route with them again!

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 $710, Delta can have you in Bangkok from Ontario in 25h 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 China Airlines. Our recent data shows that you can find tickets from as low as $773 on this airline. Additional options worth looking into are Korean Air and STARLUX Airlines, starting at $781 and $789 round-trip. China Airlines is priced at 24% 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, September is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $900). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,507). 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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Alternative routes for Ontario to Bangkok

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 septiembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
China AirlinesCheapest$773Average$922FlexibilityNo cancel feeOn-time70%
Korean AirCheapest$781Average$843FlexibilityNo cancel feeOn-time81%
STARLUX AirlinesCheapest$789Average$841FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$795Average$908FlexibilityNo cancel feeOn-time69%

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