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$401+ 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 7/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Bangkok are usually found in September or March, booked 63 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 June 30, 2025.

Round-trip from

$756
(FlightHub)

One-way from

$401
(CrystalTravel)

Popular in

July

Cheapest in

September

Average price

$1,371
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. 16% potential increase in price ($201 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 June 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 June 30, 2025.

This FlightHub deal was found by Cheapflights users on 6/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/236:25 amONT - BKK
2 stops28h 40mKorean Air
Mon 8/1811:30 pmBKK - ONT
2 stops31h 41mKorean Air
Deal found 6/27$756
This Delta deal was found by Cheapflights users on 6/27. 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 10/206:45 amONT - BKK
2 stops25h 00mDelta
Sun 11/1611:15 pmBKK - ONT
2 stops38h 27mDelta
Deal found 6/27$778
This oojo deal was found by Cheapflights users on 6/27. 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.
Sat 8/911:45 pmONT - BKK
1 stop26h 55mSTARLUX Airlines
Mon 8/181:10 pmBKK - ONT
1 stop18h 30mSTARLUX Airlines
Deal found 6/27$808
This Flightnetwork deal was found by Cheapflights users on 6/30. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2412:45 amONT - BKK
1 stop19h 00mChina Airlines
Mon 9/810:50 amBKK - ONT
1 stop21h 50mChina Airlines
Deal found 6/30$812
This United Airlines deal was found by Cheapflights users on 6/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/206:00 amONT - BKK
2 stops27h 55mUnited Airlines
Wed 9/39:35 amBKK - ONT
2 stops24h 58mUnited Airlines
Deal found 6/30$825
This Korean Air deal was found by Cheapflights users on 6/28. 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.
Mon 8/46:25 amONT - BKK
2 stops25h 20mMultiple Airlines
Mon 8/1811:30 pmBKK - ONT
2 stops31h 41mMultiple Airlines
Deal found 6/28$832
This Mytrip deal was found by Cheapflights users on 6/28. 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.
Mon 10/612:10 amONT - DMK
2 stops24h 05mMultiple Airlines
Fri 10/246:40 amDMK - ONT
2 stops25h 20mMultiple Airlines
Deal found 6/28$1,071

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 June 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

Wed 7/23

6:25 am-1:05 am

2 stops28h 40m

Bangkok Suvarnabhumi

Mon 8/18

11:30 pm-5:11 pm

2 stops31h 41m

$756

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 10/20

6:45 am-9:45 pm

2 stops25h 00m

Bangkok Suvarnabhumi

Sun 11/16

11:15 pm-10:42 pm

2 stops38h 27m

$778

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 8/9

11:45 pm-4:40 pm

1 stop26h 55m

Bangkok Suvarnabhumi

Mon 8/18

1:10 pm-5:40 pm

1 stop18h 30m

$808

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 8/24

12:45 am-9:45 am

1 stop19h 00m

Bangkok Suvarnabhumi

Mon 9/8

10:50 am-6:40 pm

1 stop21h 50m

$812

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 8/20

6:00 am-11:55 pm

2 stops27h 55m

Bangkok Suvarnabhumi

Wed 9/3

9:35 am-8:33 pm

2 stops24h 58m

$825

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 8/4

6:25 am-9:45 pm

2 stops25h 20m

Bangkok Suvarnabhumi

Mon 8/18

11:30 pm-5:11 pm

2 stops31h 41m

$832

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Mon 10/6

12:10 am-2:15 pm

2 stops24h 05m

Bangkok Don Mueang Intl

Fri 10/24

6:40 am-6:00 pm

2 stops25h 20m

$1,071

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 7/23

6:25 am-1:05 am

2 stops28h 40m

$401

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 8/11

6:05 am-1:05 am

2 stops29h 00m

$435

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 8/18

12:45 am-4:20 pm

1 stop25h 35m

$473

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 14 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 June 27, 2025.

Booking 63 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, March is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $952). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,573). 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 June 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 June 30, 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
9.0
Wonderful
187 reviews

Food

8.8

Entertainment

9.0

Overall

9.0

Boarding

9.0

Crew

9.3

Comfort

9.0

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
187 reviews
STARLUX Airlines
9.0
Wonderful
187 reviews

Food

8.8

Entertainment

9.0

Overall

9.0

Boarding

9.0

Crew

9.3

Comfort

9.0

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
1,101 reviews
STARLUX Airlines
9.0
Wonderful
187 reviews

Food

8.8

Entertainment

9.0

Overall

9.0

Boarding

9.0

Crew

9.3

Comfort

9.0

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
745 reviews
STARLUX Airlines
9.0
Wonderful
187 reviews

Food

8.8

Entertainment

9.0

Overall

9.0

Boarding

9.0

Crew

9.3

Comfort

9.0

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
7,969 reviews
STARLUX Airlines
9.0
Wonderful
187 reviews

Food

8.8

Entertainment

9.0

Overall

9.0

Boarding

9.0

Crew

9.3

Comfort

9.0

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.
United Airlines
7.4
Good
8,852 reviews
STARLUX Airlines
9.0
Wonderful
187 reviews

Food

8.8

Entertainment

9.0

Overall

9.0

Boarding

9.0

Crew

9.3

Comfort

9.0

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 $756 on this airline. Additional options worth looking into are Delta and STARLUX Airlines, starting at $778 and $808 round-trip. Korean Air is priced at 28% 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 $401. However, be on the lookout for offers from Delta and China 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, March is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $952). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,573). 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$781Average$832FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$927FlexibilityNo cancel feeOn-time69%
STARLUX AirlinesCheapest$808Average$900FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$819Average$925FlexibilityNo cancel feeOn-time70%

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