HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Thailand

$376+ 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Thailand with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 15, 2025.

Round-trip from

$657
(lol.travel)

One-way from

$376
(Delta)

Popular in

December

Cheapest in

August

Average price

$742
From Ontario to Thailand
Search Deals
One-way flight from Ontario to Thailand
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($89 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 15, 2025.

This SmartFares deal was found by Cheapflights users on 9/13. 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.
Thu 11/136:45 amONT - BKK
2 stops23h 45mKorean Air
Tue 11/2511:15 pmBKK - ONT
2 stops32h 54mKorean Air
Deal found 9/13$701
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:40 amONT - BKK
2 stops23h 50mKorean Air
Tue 12/99:30 pmBKK - ONT
2 stops34h 37mKorean Air
Deal found 9/14$708
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.
Sun 10/196:00 amONT - BKK
2 stops25h 45mDelta
Wed 10/299:40 amBKK - ONT
2 stops27h 01mDelta
Deal found 9/15$710
This Delta deal was found by Cheapflights users on 9/13. 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.
Sun 10/196:00 amONT - CNX
2 stops25h 55mDelta
Sat 10/2511:15 pmCNX - ONT
2 stops37h 26mDelta
Deal found 9/13$710
This Korean Air 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/217:35 amONT - BKK
2 stops39h 40mKorean Air
Fri 10/3111:15 pmBKK - ONT
2 stops37h 26mKorean Air
Deal found 9/14$715
This Korean Air 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/296:00 amONT - CNX
2 stops25h 55mKorean Air
Mon 10/611:15 pmCNX - ONT
2 stops37h 26mKorean Air
Deal found 9/14$715
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/181:15 pmONT - BKK
2 stops42h 30mDelta
Thu 10/3012:55 amBKK - ONT
2 stops34h 25mDelta
Deal found 9/14$716
This EaseMyTrip deal was found by Cheapflights users on 9/13. 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 EaseMyTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/286:45 amONT - BKK
2 stops25h 35mKorean Air
Mon 12/1512:55 amBKK - ONT
2 stops31h 12mKorean Air
Deal found 9/13$723
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:00 amONT - BKK
2 stops32h 10mUnited Airlines
Fri 1/99:10 amBKK - ONT
2 stops42h 04mUnited Airlines
Deal found 9/14$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.
Tue 9/166:00 amONT - BKK
2 stops32h 35mUnited Airlines
Sun 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.
Wed 9/176:00 amONT - BKK
2 stops27h 55mUnited Airlines
Fri 9/267:00 amBKK - ONT
2 stops24h 40mUnited 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.
Mon 9/156:50 pmONT - BKK
2 stops43h 45mUnited Airlines
Sun 9/217:00 amBKK - ONT
2 stops27h 43mUnited Airlines
Deal found 9/15$733

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 September 15, 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

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 10/19

6:00 am-9:45 pm

2 stops25h 45m

Bangkok Suvarnabhumi

Sat 11/1

11:15 pm-11:41 pm

2 stops38h 26m

$710

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 11/12

6:45 am-11:20 pm

2 stops25h 35m

Bangkok Suvarnabhumi

Fri 11/21

9:40 am-11:52 pm

2 stops29h 12m

$710

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 11/12

6:45 am-12:45 am

2 stops27h 00m

Bangkok Suvarnabhumi

Thu 11/27

9:40 am-6:18 pm

2 stops23h 38m

$710

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Tue 10/21

7:35 am-9:55 pm

2 stops24h 20m

Chiang Mai

Sat 10/25

11:15 pm-10:41 pm

2 stops37h 26m

$710

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/29

6:00 am-9:45 pm

2 stops25h 45m

Bangkok Suvarnabhumi

Tue 10/14

2:35 am-5:10 pm

2 stops28h 35m

$715

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 11/19

6:45 am-11:20 pm

2 stops25h 35m

Bangkok Suvarnabhumi

Wed 1/28

11:15 pm-3:20 pm

2 stops31h 05m

$715

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 11/19

6:45 am-11:20 pm

2 stops25h 35m

Bangkok Suvarnabhumi

Thu 1/29

9:40 am-3:20 pm

2 stops44h 40m

$715

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 11/14

6:00 am-11:25 am

2 stops38h 25m

Bangkok Suvarnabhumi

Mon 11/24

4:55 pm-10:51 pm

2 stops20h 56m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 1/22

1:53 pm-11:25 am

2 stops30h 32m

Bangkok Suvarnabhumi

Fri 1/30

4:55 pm-10:53 pm

2 stops20h 58m

$750

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 1/24

6:39 pm-11:25 am

2 stops25h 46m

Bangkok Suvarnabhumi

Fri 2/27

4:55 pm-10:57 pm

2 stops21h 02m

$750

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 60 results
1
2
3
...
6

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 September 15, 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 September 15, 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
211 reviews

Crew

9.2

Boarding

9.0

Entertainment

8.9

Food

8.8

Comfort

8.9

Overall

8.9

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
211 reviews
STARLUX Airlines
8.9
Very good
211 reviews

Crew

9.2

Boarding

9.0

Entertainment

8.9

Food

8.8

Comfort

8.9

Overall

8.9

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
1,139 reviews
STARLUX Airlines
8.9
Very good
211 reviews

Crew

9.2

Boarding

9.0

Entertainment

8.9

Food

8.8

Comfort

8.9

Overall

8.9

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
767 reviews
STARLUX Airlines
8.9
Very good
211 reviews

Crew

9.2

Boarding

9.0

Entertainment

8.9

Food

8.8

Comfort

8.9

Overall

8.9

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
8,929 reviews
STARLUX Airlines
8.9
Very good
211 reviews

Crew

9.2

Boarding

9.0

Entertainment

8.9

Food

8.8

Comfort

8.9

Overall

8.9

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 25h 45m. Delta provides one of the quickest options available for as low as $710. The distance between Ontario and Thailand is about 8280 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 $480 one-way.

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

    Most travelers choose Ontario - Bangkok Suvarnabhumi, Ontario - Phuket City or Ontario - Bangkok Don Mueang Intl 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Thailand

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Haneda flights
Los Angeles to Narita flights
San Francisco to Haneda flights
San Francisco to Narita flights
Los Angeles to Manila flights
Los Angeles to Suvarnabhumi flights
San Francisco to Manila flights
San Francisco to Hong Kong flights
San Francisco to Taiwan Taoyuan Intl flights
Los Angeles to Incheon Intl flights
San Francisco to New Delhi flights
San Francisco to Suvarnabhumi flights
Los Angeles to Taiwan Taoyuan Intl flights
Ontario to Narita flights
Los Angeles to Ho Chi Minh City flights
San Francisco to Mumbai flights
San Francisco to Ho Chi Minh City flights
San Francisco to Hongqiao Intl flights
Los Angeles to Kansai Intl flights
Los Angeles to Hong Kong flights
Ontario to Haneda flights
San Francisco to Incheon Intl flights
San Francisco to Pu Dong flights
Los Angeles to Hongqiao Intl flights
San Diego to Narita flights
Ontario to Suvarnabhumi flights
Ontario to Manila flights
Los Angeles to New Delhi flights
Los Angeles to Pu Dong flights
Burbank to Narita flights
San Francisco to Bangalore flights
San Jose to New Delhi flights
Ontario to Taiwan Taoyuan Intl flights
Los Angeles to Singapore flights
Los Angeles to Mumbai flights
Oakland to New Delhi flights
Los Angeles to Gimpo Intl flights
Santa Ana to Haneda flights
San Francisco to Sung Shan flights
Los Angeles to Don Mueang Intl flights
Los Angeles to Yerevan flights
San Francisco to Hyderabad flights
Burbank to Suvarnabhumi flights
San Jose to Haneda flights
Burbank to Manila flights
Los Angeles to Sung Shan flights
Santa Ana to Suvarnabhumi flights
Santa Ana to Manila flights
San Diego to Haneda flights
Ontario to Ho Chi Minh City flights

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 September 15, 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%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.