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$423+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Bangkok are usually found in September or March, booked 42 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 July 30, 2025.

Round-trip from

$739
(CrystalTravel)

One-way from

$411
(lol.travel)

Popular in

June

Cheapest in

September

Average price

$1,095
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. 17% potential increase in price ($214 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 30, 2025.

This CrystalTravel deal was found by Cheapflights users on 7/29. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/196:37 amONT - BKK
2 stops28h 28mKorean Air
Wed 11/51:00 amBKK - ONT
2 stops31h 10mKorean Air
Deal found 7/29$739
This Delta deal was found by Cheapflights users on 7/29. 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 8/206:05 amONT - BKK
2 stops25h 40mDelta
Thu 11/69:40 amBKK - ONT
2 stops22h 30mDelta
Deal found 7/29$778
This oojo deal was found by Cheapflights users on 7/29. 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 11/39:45 pmONT - BKK
1 stop27h 45mSTARLUX Airlines
Mon 11/171:45 pmBKK - ONT
1 stop17h 05mSTARLUX Airlines
Deal found 7/29$806
This oojo deal was found by Cheapflights users on 7/30. 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.
Tue 8/1912:45 amONT - BKK
1 stop21h 25mChina Airlines
Wed 8/271:20 pmBKK - ONT
1 stop19h 20mChina Airlines
Deal found 7/30$822
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Thu 9/1112:45 amONT - DMK
2 stops32h 30mMultiple Airlines
Sat 9/277:30 amDMK - ONT
2 stops24h 30mMultiple Airlines
Deal found 7/30$1,005

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 July 30, 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

Sun 10/19

6:37 am-1:05 am

2 stops28h 28m

Bangkok Suvarnabhumi

Wed 11/5

1:00 am-5:10 pm

2 stops31h 10m

$739

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 8/20

6:05 am-9:45 pm

2 stops25h 40m

Bangkok Suvarnabhumi

Thu 11/6

9:40 am-5:10 pm

2 stops22h 30m

$778

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 1/23

10:50 pm-9:50 am

1 stop20h 00m

Bangkok Suvarnabhumi

Thu 2/5

2:35 am-4:50 pm

1 stop29h 15m

$796

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 11/3

9:45 pm-4:30 pm

1 stop27h 45m

Bangkok Suvarnabhumi

Mon 11/17

1:45 pm-3:50 pm

1 stop17h 05m

$806

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Thu 9/11

12:45 am-11:15 pm

2 stops32h 30m

Bangkok Don Mueang Intl

Sat 9/27

7:30 am-6:00 pm

2 stops24h 30m

$1,005

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/15

6:00 am-11:25 pm

2 stops27h 25m

$423

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/8

6:00 am-11:25 pm

2 stops27h 25m

$434

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 10/25

11:10 pm-4:30 pm

1 stop27h 20m

$453

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 1/26

10:50 pm-1:05 pm

1 stop23h 15m

$458

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 8/26

6:00 am-11:00 pm

2 stops27h 00m

$478

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 12 results
1
2

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 July 25, 2025.

Booking 42 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 $946). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,563). 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 July 30, 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.

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 July 30, 2025.
Read through reviews of airlines operating flights from Ontario to Bangkok, such as STARLUX Airlines, Korean Air, and Japan Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
9.0
Wonderful
199 reviews

Entertainment

8.9

Food

8.8

Overall

9.0

Crew

9.3

Boarding

9.0

Comfort

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
STARLUX Airlines
9.0
Wonderful
199 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Entertainment

8.9

Food

8.8

Overall

9.0

Crew

9.3

Boarding

9.0

Comfort

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
Korean Air
8.4
Very good
1,121 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Entertainment

8.9

Food

8.8

Overall

9.0

Crew

9.3

Boarding

9.0

Comfort

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
Japan Airlines
8.3
Very good
1,536 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Entertainment

8.9

Food

8.8

Overall

9.0

Crew

9.3

Boarding

9.0

Comfort

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
China Airlines
8.3
Very good
754 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Entertainment

8.9

Food

8.8

Overall

9.0

Crew

9.3

Boarding

9.0

Comfort

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
Delta
8.0
Very good
7,980 reviews
STARLUX Airlines
9.0
Wonderful
199 reviews

Entertainment

8.9

Food

8.8

Overall

9.0

Crew

9.3

Boarding

9.0

Comfort

8.9

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.

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.

  • 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 $739 on this airline. Additional options worth looking into are Delta and China Airlines, starting at $778 and $796 round-trip. Korean Air is priced at 27% 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 $411. However, be on the lookout for offers from Delta 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, September is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $946). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,563). 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$781Average$833FlexibilityNo cancel feeOn-time81%
STARLUX AirlinesCheapest$789Average$847FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$795Average$908FlexibilityNo cancel feeOn-time69%
China AirlinesCheapest$822Average$931FlexibilityNo cancel feeOn-time70%

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