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$454+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
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 March 25, 2025.

Round-trip from

$815
(Delta)

One-way from

$454
(United Airlines)

Popular in

June

Cheapest in

March

Average price

$777
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 ($241 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 March 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 March 25, 2025.

This FlightHub deal was found by Cheapflights users on 3/24. 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 4/245:45 amONT - BKK
2 stops27h 55mKorean Air
Sun 5/49:50 amBKK - ONT
2 stops44h 54mKorean Air
Deal found 3/24$783
This Delta deal was found by Cheapflights users on 3/24. 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.
Mon 4/215:45 amONT - BKK
2 stops26h 00mDelta
Sat 5/249:50 amBKK - ONT
2 stops22h 30mDelta
Deal found 3/24$787
This Delta deal was found by Cheapflights users on 3/24. 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.
Fri 8/157:00 amONT - CNX
2 stops24h 55mDelta
Wed 9/1011:15 pmCNX - ONT
2 stops38h 28mDelta
Deal found 3/24$815
This KAYAK deal was found by Cheapflights users on 3/24. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/127:00 amONT - CNX
2 stops40h 05mKorean Air
Tue 2/1012:15 amCNX - ONT
2 stops32h 00mKorean Air
Deal found 3/24$828
This Korean Air deal was found by Cheapflights users on 3/24. 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 11/57:00 amONT - BKK
2 stops25h 20mMultiple Airlines
Wed 11/269:30 pmBKK - ONT
2 stops30h 53mMultiple Airlines
Deal found 3/24$830
This Gotogate deal was found by Cheapflights users on 3/24. 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.
Sun 5/412:10 amONT - BKK
1 stop26h 10mChina Airlines
Sun 5/185:30 pmBKK - ONT
1 stop38h 30mChina Airlines
Deal found 3/24$837
This FlightHub deal was found by Cheapflights users on 3/24. 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.
Sun 5/1112:10 amONT - CNX
1 stop20h 10mChina Airlines
Wed 5/2111:20 amCNX - ONT
1 stop20h 40mChina Airlines
Deal found 3/24$861
This United Airlines deal was found by Cheapflights users on 3/24. 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 8/1910:00 amONT - BKK
2 stops23h 55mUnited Airlines
Tue 9/97:00 amBKK - ONT
2 stops24h 42mUnited Airlines
Deal found 3/24$867
This Delta deal was found by Cheapflights users on 3/23. 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 9/96:00 amONT - HKT
2 stops26h 10mDelta
Sun 9/2111:25 pmHKT - ONT
2 stops37h 16mDelta
Deal found 3/23$876
This Gurufare deal was found by Cheapflights users on 3/24. 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.
Fri 9/1211:10 pmONT - BKK
1 stop27h 30mSTARLUX Airlines
Sun 10/55:50 pmBKK - ONT
1 stop37h 15mSTARLUX Airlines
Deal found 3/24$901
This Korean Air deal was found by Cheapflights users on 3/24. 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 11/137:00 amONT - HKT
2 stops23h 40mMultiple Airlines
Tue 12/211:20 pmHKT - ONT
2 stops29h 03mMultiple Airlines
Deal found 3/24$930
This Korean Air deal was found by Cheapflights users on 3/24. 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 9/157:00 amONT - CNX
2 stops24h 55mMultiple Airlines
Mon 9/2211:15 pmCNX - ONT
2 stops32h 07mMultiple Airlines
Deal found 3/24$939

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 March 25, 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

Thu 4/24

5:45 am-11:40 pm

2 stops27h 55m

Bangkok Suvarnabhumi

Sun 5/4

9:50 am-4:44 pm

2 stops44h 54m

$783

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 4/21

5:45 am-9:45 pm

2 stops26h 00m

Bangkok Suvarnabhumi

Sat 5/24

9:50 am-6:20 pm

2 stops22h 30m

$787

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Fri 8/15

7:00 am-9:55 pm

2 stops24h 55m

Chiang Mai

Wed 9/10

11:15 pm-11:43 pm

2 stops38h 28m

$815

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/15

12:10 am-4:20 pm

1 stop26h 10m

Bangkok Suvarnabhumi

Wed 9/24

1:20 pm-6:00 pm

1 stop18h 40m

$828

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 5/11

12:10 am-10:20 am

1 stop20h 10m

Chiang Mai

Wed 5/21

11:20 am-6:00 pm

1 stop20h 40m

$861

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 8/19

10:00 am-11:55 pm

2 stops23h 55m

Bangkok Suvarnabhumi

Tue 9/9

7:00 am-5:42 pm

2 stops24h 42m

$867

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Tue 9/9

6:00 am-10:10 pm

2 stops26h 10m

Phuket City

Tue 9/16

11:25 pm-10:41 pm

2 stops37h 16m

$876

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 9/12

11:10 pm-4:40 pm

1 stop27h 30m

Bangkok Suvarnabhumi

Sun 10/5

5:50 pm-5:05 pm

1 stop37h 15m

$901

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Mon 9/15

7:00 am-9:55 pm

2 stops24h 55m

Chiang Mai

Mon 9/22

11:15 pm-5:22 pm

2 stops32h 07m

$939

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Sat 9/13

7:00 am-10:10 pm

2 stops25h 10m

Phuket City

Sun 9/21

11:25 pm-5:22 pm

2 stops31h 57m

$971

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

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 $963). 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 March 25, 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 March 25, 2025.
Peruse reviews from past customers who have flown with STARLUX Airlines, Korean Air and Japan 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.
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Crew

9.3

Comfort

9.0

Entertainment

9.0

Food

8.9

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
STARLUX Airlines
9.1
Wonderful
144 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Crew

9.3

Comfort

9.0

Entertainment

9.0

Food

8.9

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
Korean Air
8.4
Very good
1,047 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Crew

9.3

Comfort

9.0

Entertainment

9.0

Food

8.9

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
Japan Airlines
8.3
Very good
1,440 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Crew

9.3

Comfort

9.0

Entertainment

9.0

Food

8.9

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
China Airlines
8.2
Very good
723 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Crew

9.3

Comfort

9.0

Entertainment

9.0

Food

8.9

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
Delta
8.0
Very good
7,890 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Crew

9.3

Comfort

9.0

Entertainment

9.0

Food

8.9

Overall

9.1

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

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 $454 on United Airlines. Other airlines that offer cheap prices include China Airlines from $481 and Delta from $485 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 $963). 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 March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$785Average$859FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
DeltaCheapest$807Average$858FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$825Average$1,120FlexibilityNo cancel feeOn-time70%
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