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$418+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Round-trip from

$777
(Delta)

One-way from

$418
(United Airlines)

Popular in

June

Cheapest in

March

Average price

$971
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. 18% potential increase in price ($216 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 1, 2025.

This StudentUniverse deal was found by Cheapflights users on 4/30. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/65:45 amONT - BKK
2 stops26h 00mKorean Air
Mon 5/199:40 pmBKK - ONT
2 stops34h 40mKorean Air
Deal found 4/30$774
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/76:00 amONT - BKK
2 stops25h 45mDelta
Mon 5/269:50 amBKK - ONT
2 stops22h 30mDelta
Deal found 4/30$777
This Korean Air deal was found by Cheapflights users on 4/30. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:00 amONT - CNX
2 stops25h 05mKorean Air
Tue 2/1012:15 amCNX - ONT
2 stops32h 00mKorean Air
Deal found 4/30$782
This United Airlines deal was found by Cheapflights users on 4/30. 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.
Thu 8/216:00 amONT - BKK
2 stops27h 55mUnited Airlines
Wed 9/109:35 amBKK - ONT
2 stops24h 58mUnited Airlines
Deal found 4/30$805
This oojo deal was found by Cheapflights users on 4/30. 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.
Mon 9/111:10 pmONT - BKK
1 stop22h 50mSTARLUX Airlines
Mon 9/221:10 pmBKK - ONT
1 stop17h 55mSTARLUX Airlines
Deal found 4/30$819
This Korean Air deal was found by Cheapflights users on 4/30. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:00 amONT - BKK
2 stops26h 20mMultiple Airlines
Fri 11/211:00 amBKK - ONT
2 stops27h 18mMultiple Airlines
Deal found 4/30$849
This Korean Air deal was found by Cheapflights users on 4/29. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/17:00 amONT - CNX
2 stops26h 05mMultiple Airlines
Thu 11/1312:15 amCNX - ONT
2 stops28h 03mMultiple Airlines
Deal found 4/29$849
This oojo deal was found by Cheapflights users on 4/30. 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 11/410:45 pmONT - BKK
1 stop23h 20mChina Airlines
Mon 11/102:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 4/30$875
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/65:45 amONT - HKT
2 stops26h 25mDelta
Tue 5/2011:25 pmHKT - ONT
2 stops32h 55mDelta
Deal found 4/30$877
This Korean Air deal was found by Cheapflights users on 4/30. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/65:45 amONT - HKT
2 stops26h 25mKorean Air
Wed 5/2111:25 pmHKT - ONT
2 stops32h 55mKorean Air
Deal found 4/30$882
This Ovago deal was found by Cheapflights users on 4/29. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1210:45 pmONT - CNX
1 stop20h 40mChina Airlines
Wed 2/1111:25 amCNX - ONT
1 stop20h 25mChina Airlines
Deal found 4/29$901
This oojo deal was found by Cheapflights users on 4/30. 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.
Mon 9/2911:39 amONT - BKK
2 stops28h 36mQatar Airways
Sun 2/88:10 amBKK - ONT
2 stops49h 07mQatar Airways
Deal found 4/30$968

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 May 1, 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

Mon 9/22

7:00 am-1:05 am

2 stops28h 05m

Bangkok Suvarnabhumi

Sun 10/19

2:35 am-11:46 pm

2 stops35h 11m

$777

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 5/13

6:00 am-11:40 pm

2 stops27h 40m

Bangkok Suvarnabhumi

Tue 5/20

9:40 pm-6:20 pm

2 stops34h 40m

$782

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 8/21

6:00 am-11:55 pm

2 stops27h 55m

Bangkok Suvarnabhumi

Wed 9/10

9:35 am-8:33 pm

2 stops24h 58m

$805

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/1

11:10 pm-12:00 pm

1 stop22h 50m

Bangkok Suvarnabhumi

Mon 9/22

1:10 pm-5:05 pm

1 stop17h 55m

$819

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 9/2

12:45 am-9:45 am

1 stop19h 00m

Bangkok Suvarnabhumi

Wed 9/24

1:20 pm-6:00 pm

1 stop18h 40m

$875

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 9/21

12:10 am-10:20 am

1 stop20h 10m

Chiang Mai

Fri 9/26

11:20 am-6:00 pm

1 stop20h 40m

$939

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Wed 7/2

6:25 am-10:10 pm

2 stops25h 45m

Phuket City

Wed 11/5

11:20 pm-5:17 pm

2 stops32h 57m

$944

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 5/13

6:00 am-11:40 pm

2 stops27h 40m

Bangkok Suvarnabhumi

Sat 5/31

11:30 pm-6:20 pm

2 stops32h 50m

$957

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/1

6:00 am-6:15 am

2 stops34h 15m

Bangkok Suvarnabhumi

Mon 9/29

2:30 am-11:59 pm

2 stops35h 29m

$965

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Tue 9/9

7:00 am-9:55 pm

2 stops24h 55m

Chiang Mai

Sat 9/27

11:20 am-6:00 pm

1 stop20h 40m

$1,019

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 41 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, March is the cheapest month in which you can book a flight from Ontario to Thailand (average of $955). Flying from Ontario to Thailand in December is currently the most expensive (average of $1,574). 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 May 1, 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.

Rainfall in Thailand by month

Plan your trip to Thailand by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Thailand ranges from 0.4 - 12.6 inches per month. September is typically the wettest month, when rainfall can reach 12.6 in. January is typically the driest time to visit Thailand when rainfall is around 0.4 in.

Temperature in Thailand by month

Plan your trip to Thailand by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Thailand, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 86.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).

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 May 1, 2025.
Peruse reviews from past customers who have flown with STARLUX Airlines, EVA Air and Korean Air from Ontario to Thailand to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
9.1
Wonderful
161 reviews

Overall

9.1

Entertainment

9.0

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
STARLUX Airlines
9.1
Wonderful
161 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Overall

9.1

Entertainment

9.0

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
EVA Air
8.4
Very good
1,186 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Overall

9.1

Entertainment

9.0

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
Korean Air
8.4
Very good
1,068 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Overall

9.1

Entertainment

9.0

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
Japan Airlines
8.3
Very good
1,464 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Overall

9.1

Entertainment

9.0

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.
China Airlines
8.3
Very good
732 reviews
STARLUX Airlines
9.1
Wonderful
161 reviews

Overall

9.1

Entertainment

9.0

Comfort

9.0

Boarding

9.0

Crew

9.3

Food

8.9

Reviews

1 / 6
10.0
Excellent

Anonymous,Apr 2025

KIX - TPE

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety. They offer blindfolds and earplugs, which are a plus.

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.

  • 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 $418 on United Airlines. Other airlines that offer cheap prices include Korean Air from $440 and Delta from $454 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, March is the cheapest month in which you can book a flight from Ontario to Thailand (average of $955). Flying from Ontario to Thailand in December is currently the most expensive (average of $1,574). 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$785Average$871FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
China AirlinesCheapest$796Average$920FlexibilityNo cancel feeOn-time70%
DeltaCheapest$807Average$809FlexibilityNo cancel feeOn-timeN/A

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