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$361+ Cheap flights from Ontario (ONT) to Thailand

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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Cheap flight deals from Ontario to Thailand

Keep the following information in mind while searching for Ontario to Thailand flight deals. Data was last updated septiembre 17, 2025.

Round-trip from

$701
(SmartFares)

One-way from

$361
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$742
From Ontario to Thailand
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One-way flight from Ontario to Thailand
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Highest demand for flights based on searches. 9% potential increase in price ($89 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 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 Thailand

Cheapest flights from Ontario to Thailand
Explore the most affordable flight options available from Ontario to Thailand. 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 Thailand 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 Thailand that are best for you.

Fly from

Ontario

Fly to

Thailand

Route

Depart

Return

Price

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

lun. 3/9

6:00 am-10:55 pm

2 stops26h 55m

Chiang Mai

mié. 3/11

12:15 am-10:38 pm

2 stops36h 23m

$710

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

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

lun. 2/16

6:45 am-10:55 pm

2 stops25h 10m

Chiang Mai

mar. 2/24

12:15 am-10:38 pm

2 stops37h 23m

$715

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

mar. 2/17

6:45 am-10:55 pm

2 stops25h 10m

Chiang Mai

jue. 2/26

12:15 am-3:20 pm

2 stops30h 05m

$715

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

dom. 2/15

6:45 am-10:55 pm

2 stops25h 10m

Chiang Mai

jue. 2/26

12:15 am-3:20 pm

2 stops30h 05m

$715

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

sáb. 2/14

6:45 am-10:55 pm

2 stops25h 10m

Chiang Mai

mar. 2/24

12:15 am-10:38 pm

2 stops37h 23m

$715

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

dom. 2/15

6:45 am-10:55 pm

2 stops25h 10m

Chiang Mai

mar. 2/24

12:15 am-10:38 pm

2 stops37h 23m

$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

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Thailand

Have a flexible travel schedule? Discover the best time to fly to Thailand 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 Thailand

What is the cheapest month to book a flight from Ontario to Thailand?

Currently, September is the cheapest month in which you can book a flight from Ontario to Thailand (average of $900). Flying from Ontario to Thailand 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 TH?

Find hourly flight availability from Ontario to Thailand. 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.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Thailand as you normally would.

Reviews of airlines servicing Thailand

Get insights into the airlines that provide service to Thailand. 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 Thailand. Reviews last updated septiembre 17, 2025.
Peruse reviews from past customers who have flown with STARLUX Airlines, Korean Air, and China Airlines from Ontario to Thailand to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
8.9
Very good
215 reviews

Boarding

9.0

Overall

8.9

Comfort

8.9

Crew

9.2

Entertainment

8.9

Food

8.8

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

Boarding

9.0

Overall

8.9

Comfort

8.9

Crew

9.2

Entertainment

8.9

Food

8.8

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

Boarding

9.0

Overall

8.9

Comfort

8.9

Crew

9.2

Entertainment

8.9

Food

8.8

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

Boarding

9.0

Overall

8.9

Comfort

8.9

Crew

9.2

Entertainment

8.9

Food

8.8

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

Boarding

9.0

Overall

8.9

Comfort

8.9

Crew

9.2

Entertainment

8.9

Food

8.8

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 Thailand. 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 Thailand?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Thailand.

  • How long is the flight from Ontario to Thailand?

    A quick flight from Ontario to Thailand can take about 26h 55m. Delta provides one of the quickest options available for as low as $710. The distance between Ontario and Thailand is about 8060 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Ontario to Thailand one-way?

    One-way options have recently been found by users for as low as $376 on Delta. Other airlines that offer cheap prices include Korean Air from $429 and China Airlines from $478 one-way.

  • What are the most popular routes from Ontario to Thailand?

    Most travelers choose Ontario - Bangkok Suvarnabhumi, Ontario - Phuket City or Ontario - Chiang Mai when deciding on the best route from Ontario to Thailand.

  • Can I find deals for flights from Ontario to Thailand that include hotel bookings?

    Yes. In addition to deals on Ontario to Thailand flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Thailand?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Thailand.

  • Can I find deals for business class flights from Ontario to Thailand?

    Yes. Cheapflights offers flight deals from Ontario to Thailand 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 Thailand?

    Currently, September is the cheapest month in which you can book a flight from Ontario to Thailand (average of $900). Flying from Ontario to Thailand 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 Thailand

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 Thailand

Discover the top 4 airlines that operate flights from Ontario to Thailand. 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$904FlexibilityNo 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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