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$366+ 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 11/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Dec 21 — Dec 281
Sun 12/21
Sun 12/28
1 adult, Economy
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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 November 21, 2025.

This oojo deal was found by Cheapflights users on 11/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2710:50 pmONT - BKK
1 stop23h 15mChina Airlines
Thu 12/410:55 amBKK - ONT
1 stop20h 55mChina Airlines
Deal found 11/20$733
This Delta deal was found by Cheapflights users on 11/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:00 amONT - BKK
2 stops27h 55mDelta
Sat 12/62:05 amBKK - ONT
2 stops36h 53mDelta
Deal found 11/21$734
This Korean Air deal was found by Cheapflights users on 11/21. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/16:45 amONT - BKK
2 stops39h 40mKorean Air
Mon 12/222:05 amBKK - ONT
2 stops30h 03mKorean Air
Deal found 11/21$739
This Delta deal was found by Cheapflights users on 11/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:40 pmONT - BKK
2 stops57h 45mDelta
Tue 12/2311:15 pmBKK - ONT
2 stops32h 53mDelta
Deal found 11/21$740
This Gotogate deal was found by Cheapflights users on 11/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2810:50 pmONT - BKK
1 stop26h 55mChina Airlines
Tue 12/162:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 11/20$744
This oojo deal was found by Cheapflights users on 11/19. 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.
Fri 11/2810:50 pmONT - BKK
1 stop35h 45mChina Airlines
Fri 12/122:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 11/19$745
This oojo deal was found by Cheapflights users on 11/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2510:50 pmONT - BKK
1 stop23h 15mChina Airlines
Tue 12/22:05 pmBKK - ONT
1 stop17h 45mChina Airlines
Deal found 11/20$749
This United Airlines deal was found by Cheapflights users on 11/19. 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 11/266:00 amONT - BKK
2 stops38h 25mUnited Airlines
Wed 12/34:55 pmBKK - ONT
2 stops39h 42mUnited Airlines
Deal found 11/19$750
This CheapOair deal was found by Cheapflights users on 11/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2410:50 pmONT - BKK
1 stop26h 55mChina Airlines
Thu 11/275:50 pmBKK - ONT
1 stop38h 00mChina Airlines
Deal found 11/20$754
This CheapOair deal was found by Cheapflights users on 11/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2710:50 pmONT - BKK
1 stop20h 00mChina Airlines
Fri 12/55:50 pmBKK - ONT
1 stop38h 00mChina Airlines
Deal found 11/19$755
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Mon 11/241:40 pmONT - BKK
2 stops54h 45mUnited Airlines
Fri 12/194:55 pmBKK - ONT
2 stops20h 46mUnited Airlines
Deal found 11/19$756
This Gotogate deal was found by Cheapflights users on 11/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2910:50 pmONT - CNX
1 stop26h 45mChina Airlines
Mon 12/155:35 pmCNX - ONT
1 stop38h 15mChina Airlines
Deal found 11/19$797

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 November 21, 2025.

Round-trip from

$690
(Delta)

One-way from

$366
(Delta)

Popular in

June

Cheapest in

October

Average price

$756
From Ontario to Thailand
Search Deals
One-way flight from Ontario to Thailand
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($159 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 21, 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

Mon 3/16

6:45 am-10:55 pm

2 stops26h 10m

Chiang Mai

Wed 3/18

12:15 am-10:38 pm

2 stops36h 23m

$690

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 4/15

6:00 am-9:45 am

2 stops37h 45m

Bangkok Suvarnabhumi

Mon 4/27

7:00 am-11:06 pm

2 stops30h 06m

$734

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 3/14

6:45 am-12:55 am

2 stops28h 10m

Bangkok Suvarnabhumi

Sun 3/22

9:30 pm-10:38 pm

2 stops39h 08m

$734

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 3/14

6:45 am-12:55 am

2 stops28h 10m

Bangkok Suvarnabhumi

Mon 3/23

11:15 pm-10:38 pm

2 stops37h 23m

$734

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 1/25

7:30 am-12:55 am

2 stops26h 25m

Bangkok Suvarnabhumi

Sat 2/7

2:05 am-1:56 pm

2 stops26h 51m

$744

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 1/12

7:30 am-12:55 am

2 stops26h 25m

Bangkok Suvarnabhumi

Thu 1/22

11:15 pm-1:56 pm

2 stops29h 41m

$745

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Thu 1/1

6:38 am-10:55 pm

2 stops25h 17m

Chiang Mai

Mon 2/9

12:15 am-1:56 pm

2 stops28h 41m

$745

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 2/14

3:30 pm-12:45 am

2 stops42h 15m

Bangkok Suvarnabhumi

Sun 3/1

9:30 pm-1:56 pm

2 stops31h 26m

$745

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 3/1

6:00 am-5:10 am

2 stops56h 10m

Bangkok Suvarnabhumi

Tue 3/31

3:40 pm-5:47 pm

2 stops40h 07m

$748

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 1/10

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Fri 1/23

4:55 pm-12:17 pm

2 stops34h 22m

$750

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

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, April is the cheapest month in which you can book a flight from Ontario to Thailand (average of $486). Flying from Ontario to Thailand 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.

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 November 21, 2025.

When flying from Ontario to Thailand, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 38% versus a flight in the afternoon.

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 November 21, 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
232 reviews

Entertainment

8.9

Food

8.7

Overall

8.9

Crew

9.2

Comfort

8.9

Boarding

9.0

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
STARLUX Airlines
8.9
Very good
232 reviews
STARLUX Airlines
8.9
Very good
232 reviews

Entertainment

8.9

Food

8.7

Overall

8.9

Crew

9.2

Comfort

8.9

Boarding

9.0

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
Korean Air
8.4
Very good
1,170 reviews
STARLUX Airlines
8.9
Very good
232 reviews

Entertainment

8.9

Food

8.7

Overall

8.9

Crew

9.2

Comfort

8.9

Boarding

9.0

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
China Airlines
8.3
Very good
782 reviews
STARLUX Airlines
8.9
Very good
232 reviews

Entertainment

8.9

Food

8.7

Overall

8.9

Crew

9.2

Comfort

8.9

Boarding

9.0

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them
United Airlines
7.4
Good
9,029 reviews
STARLUX Airlines
8.9
Very good
232 reviews

Entertainment

8.9

Food

8.7

Overall

8.9

Crew

9.2

Comfort

8.9

Boarding

9.0

Reviews

1 / 9
10.0
Excellent

Chad,Nov 2025

TPE - SEA

Starlux Airlines was amazing. No complaints on anything with them

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 25h 17m. Delta provides one of the quickest options available for as low as $745. 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 $366 on Delta. Other airlines that offer cheap prices include Korean Air from $369 and China Airlines from $575 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, April is the cheapest month in which you can book a flight from Ontario to Thailand (average of $486). Flying from Ontario to Thailand 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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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 November 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$732Average$833FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$756Average$917FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$778Average$854FlexibilityNo cancel feeOn-time69%
STARLUX AirlinesCheapest$787Average$825FlexibilityNo cancel feeOn-timeN/A

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