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$421+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Feb 26 — Mar 51
Wed 2/26
Wed 3/5
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 February 21, 2025.

Round-trip from

$737
(Delta)

One-way from

$421
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$815
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. 20% potential increase in price ($246 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 21, 2025.

This Delta deal was found by Cheapflights users on 2/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/235:40 amONT - BKK
2 stops25h 50mDelta
Tue 5/2711:30 pmBKK - ONT
2 stops31h 44mDelta
Deal found 2/19$737
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/56:00 amONT - CNX
2 stops26h 05mDelta
Fri 5/211:15 pmCNX - ONT
2 stops37h 36mDelta
Deal found 2/20$787
This Gotogate deal was found by Cheapflights users on 2/19. 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.
Thu 3/610:45 pmONT - BKK
1 stop23h 20mChina Airlines
Wed 3/1910:55 amBKK - ONT
1 stop20h 55mChina Airlines
Deal found 2/19$837
This United Airlines deal was found by Cheapflights users on 2/19. 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 3/36:00 amONT - BKK
2 stops27h 05mUnited Airlines
Mon 3/177:10 amBKK - ONT
2 stops24h 54mUnited Airlines
Deal found 2/19$849
This United deal was found by Cheapflights users on 2/20. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/273:55 pmONT - BKK
2 stops42h 00mMultiple Airlines
Tue 5/137:00 amBKK - ONT
2 stops21h 25mMultiple Airlines
Deal found 2/20$872
This FlightHub deal was found by Cheapflights users on 2/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/610:45 pmONT - CNX
1 stop20h 40mChina Airlines
Wed 4/3011:20 amCNX - ONT
1 stop20h 40mChina Airlines
Deal found 2/20$874
This Gurufare deal was found by Cheapflights users on 2/19. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/26:00 amONT - BKK
2 stops24h 30mKorean Air
Tue 3/259:40 amBKK - ONT
2 stops45h 02mKorean Air
Deal found 2/19$893
This Korean Air deal was found by Cheapflights users on 2/20. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/65:40 amONT - CNX
2 stops26h 15mKorean Air
Sun 4/1311:15 pmCNX - ONT
2 stops31h 28mKorean Air
Deal found 2/20$893
This Ovago deal was found by Cheapflights users on 2/19. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/611:45 pmONT - BKK
1 stop26h 55mSTARLUX Airlines
Wed 8/201:10 pmBKK - ONT
1 stop18h 30mSTARLUX Airlines
Deal found 2/19$926
This Korean Air deal was found by Cheapflights users on 2/20. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/255:40 amONT - HKT
2 stops26h 00mMultiple Airlines
Tue 4/811:25 pmHKT - ONT
2 stops31h 18mMultiple Airlines
Deal found 2/20$992
This Korean Air deal was found by Cheapflights users on 2/20. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/66:00 amONT - HKT
2 stops24h 40mKorean Air
Tue 3/2511:20 pmHKT - ONT
2 stops31h 22mKorean Air
Deal found 2/20$993
This FlightHub deal was found by Cheapflights users on 2/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/1711:45 pmONT - CNX
1 stop20h 40mMultiple Airlines
Fri 3/2810:10 amCNX - ONT
2 stops21h 40mMultiple Airlines
Deal found 2/20$1,020

Find flights from Ontario to Thailand within your budget

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 February 21, 2025.

Fly from

Ontario

Fly to

Thailand

Route

Depart

Return

Price

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 3/23

5:40 am-9:30 pm

2 stops25h 50m

Bangkok Suvarnabhumi

Mon 5/26

11:30 pm-10:40 pm

2 stops37h 10m

$737

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Wed 3/5

6:00 am-11:05 pm

2 stops26h 05m

Chiang Mai

Fri 5/2

11:15 pm-10:51 pm

2 stops37h 36m

$787

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 3/6

10:45 pm-1:05 pm

1 stop23h 20m

Bangkok Suvarnabhumi

Wed 3/19

10:55 am-5:50 pm

1 stop20h 55m

$837

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 3/3

6:00 am-12:05 am

2 stops27h 05m

Bangkok Suvarnabhumi

Mon 3/17

7:10 am-6:04 pm

2 stops24h 54m

$849

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 4/27

3:55 pm-11:55 pm

2 stops42h 00m

Bangkok Suvarnabhumi

Tue 5/13

7:00 am-2:25 pm

2 stops21h 25m

$872

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Thu 3/6

10:45 pm-10:25 am

1 stop20h 40m

Chiang Mai

Wed 4/30

11:20 am-6:00 pm

1 stop20h 40m

$874

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 3/2

6:00 am-9:30 pm

2 stops24h 30m

Bangkok Suvarnabhumi

Tue 3/11

11:15 pm-4:42 pm

2 stops31h 27m

$893

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 4/6

5:40 am-9:55 pm

2 stops26h 15m

Chiang Mai

Sun 4/13

11:15 pm-4:43 pm

2 stops31h 28m

$893

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 8/6

11:45 pm-4:40 pm

1 stop26h 55m

Bangkok Suvarnabhumi

Wed 8/20

1:10 pm-5:40 pm

1 stop18h 30m

$926

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 3/10

5:40 am-9:40 pm

2 stops26h 00m

Phuket City

Tue 3/25

11:20 pm-4:42 pm

2 stops31h 22m

$993

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 42 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.

Travel insights for flights from Ontario to Thailand

Get recent, data-driven insights about flights from Ontario to Thailand including ideal travel times, pricing trends, and more.

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

Currently, February is the cheapest month in which you can book a flight from Ontario to Thailand (average of $976). Flying from Ontario to Thailand in June is currently the most expensive (average of $1,580). 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 February 21, 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 February 21, 2025.
Peruse reviews from past customers who have flown with Korean Air, Japan Airlines and China Airlines 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.
Korean Air
8.4
Very good
1,037 reviews

Crew

8.7

Entertainment

8.2

Boarding

8.5

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

ATL - SBN

Regional jets are small and uncomfortable. When flying in or out of South Bend airport, that's usually what I'm on. It's the price one pays for the great convenience of using a small airport (cheap parking, no lines). The CRJ900 has engines attached to the fuselage near the rear of the plane. So, very loud in the back of the plane, and I happened to have the far back corner that also had no window. Oh well, a short flight and pleasant neighbor and cheerful attendant.

Korean Air
8.4
Very good
1,037 reviews
Korean Air
8.4
Very good
1,037 reviews

Crew

8.7

Entertainment

8.2

Boarding

8.5

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

ATL - SBN

Regional jets are small and uncomfortable. When flying in or out of South Bend airport, that's usually what I'm on. It's the price one pays for the great convenience of using a small airport (cheap parking, no lines). The CRJ900 has engines attached to the fuselage near the rear of the plane. So, very loud in the back of the plane, and I happened to have the far back corner that also had no window. Oh well, a short flight and pleasant neighbor and cheerful attendant.

Japan Airlines
8.3
Very good
1,440 reviews
Korean Air
8.4
Very good
1,037 reviews

Crew

8.7

Entertainment

8.2

Boarding

8.5

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

ATL - SBN

Regional jets are small and uncomfortable. When flying in or out of South Bend airport, that's usually what I'm on. It's the price one pays for the great convenience of using a small airport (cheap parking, no lines). The CRJ900 has engines attached to the fuselage near the rear of the plane. So, very loud in the back of the plane, and I happened to have the far back corner that also had no window. Oh well, a short flight and pleasant neighbor and cheerful attendant.

China Airlines
8.2
Very good
727 reviews
Korean Air
8.4
Very good
1,037 reviews

Crew

8.7

Entertainment

8.2

Boarding

8.5

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

ATL - SBN

Regional jets are small and uncomfortable. When flying in or out of South Bend airport, that's usually what I'm on. It's the price one pays for the great convenience of using a small airport (cheap parking, no lines). The CRJ900 has engines attached to the fuselage near the rear of the plane. So, very loud in the back of the plane, and I happened to have the far back corner that also had no window. Oh well, a short flight and pleasant neighbor and cheerful attendant.

Delta
8.0
Very good
8,219 reviews
Korean Air
8.4
Very good
1,037 reviews

Crew

8.7

Entertainment

8.2

Boarding

8.5

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

ATL - SBN

Regional jets are small and uncomfortable. When flying in or out of South Bend airport, that's usually what I'm on. It's the price one pays for the great convenience of using a small airport (cheap parking, no lines). The CRJ900 has engines attached to the fuselage near the rear of the plane. So, very loud in the back of the plane, and I happened to have the far back corner that also had no window. Oh well, a short flight and pleasant neighbor and cheerful attendant.

Qatar Airways
7.4
Good
3,613 reviews
Korean Air
8.4
Very good
1,037 reviews

Crew

8.7

Entertainment

8.2

Boarding

8.5

Comfort

8.3

Overall

8.4

Food

8.1

Reviews

1 / 20

6.0
Good

Anonymous,Feb 2025

ATL - SBN

Regional jets are small and uncomfortable. When flying in or out of South Bend airport, that's usually what I'm on. It's the price one pays for the great convenience of using a small airport (cheap parking, no lines). The CRJ900 has engines attached to the fuselage near the rear of the plane. So, very loud in the back of the plane, and I happened to have the far back corner that also had no window. Oh well, a short flight and pleasant neighbor and cheerful attendant.

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 $475 on Qatar Airways. Other airlines that offer cheap prices include China Airlines from $491 and Delta from $519 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, February is the cheapest month in which you can book a flight from Ontario to Thailand (average of $976). Flying from Ontario to Thailand in June is currently the most expensive (average of $1,580). 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 February 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$785Average$871FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
DeltaCheapest$807Average$995FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$825Average$1,103FlexibilityNo cancel feeOn-time70%
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