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$426+ 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$786
(FlightHub)

One-way from

$432
(Jettzy)

Popular in

December

Cheapest in

March

Average price

$1,247
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. 9% potential increase in price ($95 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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.
Wed 11/266:43 amONT - BKK
2 stops23h 47mKorean Air
Sun 12/79:40 amBKK - ONT
2 stops46h 37mKorean Air
Deal found 6/10$786
This Delta deal was found by Cheapflights users on 6/10. 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 10/236:45 amONT - BKK
2 stops25h 00mDelta
Thu 11/209:40 amBKK - ONT
2 stops22h 37mDelta
Deal found 6/10$800
This oojo deal was found by Cheapflights users on 6/12. 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 11/39:45 pmONT - BKK
1 stop23h 50mSTARLUX Airlines
Mon 11/171:45 pmBKK - ONT
1 stop17h 05mSTARLUX Airlines
Deal found 6/12$807
This oojo deal was found by Cheapflights users on 6/12. 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 11/310:45 pmONT - BKK
1 stop20h 05mChina Airlines
Sun 11/162:35 amBKK - ONT
1 stop29h 15mChina Airlines
Deal found 6/12$824
This United Airlines deal was found by Cheapflights users on 6/10. 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 8/196:00 amONT - BKK
2 stops27h 55mUnited Airlines
Tue 9/29:35 amBKK - ONT
2 stops24h 58mUnited Airlines
Deal found 6/10$825
This Korean Air deal was found by Cheapflights users on 6/12. 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 11/126:43 amONT - CNX
2 stops25h 22mKorean Air
Tue 2/1012:15 amCNX - ONT
2 stops30h 05mKorean Air
Deal found 6/12$841
This Delta deal was found by Cheapflights users on 6/10. 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 9/216:45 amONT - CNX
2 stops25h 10mDelta
Wed 9/2411:15 pmCNX - ONT
2 stops37h 27mDelta
Deal found 6/10$850
This oojo deal was found by Cheapflights users on 6/10. 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.
Wed 10/2212:10 amONT - CNX
1 stop20h 10mChina Airlines
Tue 12/2311:25 amCNX - ONT
1 stop20h 25mChina Airlines
Deal found 6/10$851
This ScholarTrip deal was found by Cheapflights users on 6/11. 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 ScholarTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/196:43 amONT - HKT
2 stops23h 57mKorean Air
Wed 11/2611:20 pmHKT - ONT
2 stops32h 57mKorean Air
Deal found 6/11$900
This Trip.com deal was found by Cheapflights users on 6/11. 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.
Fri 11/219:45 pmONT - HKT
2 stops35h 10mMultiple Airlines
Mon 12/17:30 amHKT - ONT
2 stops23h 20mMultiple Airlines
Deal found 6/11$901
This Korean Air deal was found by Cheapflights users on 6/12. 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 8/166:00 amONT - BKK
2 stops25h 45mMultiple Airlines
Sun 9/282:35 amBKK - ONT
2 stops28h 42mMultiple Airlines
Deal found 6/12$913
This FlightHub deal was found by Cheapflights users on 6/11. 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.
Wed 11/129:45 pmONT - CNX
2 stops30h 10mMultiple Airlines
Wed 2/1110:10 amCNX - ONT
2 stops20h 40mMultiple Airlines
Deal found 6/11$949

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 June 12, 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

Wed 11/26

6:43 am-9:30 pm

2 stops23h 47m

Bangkok Suvarnabhumi

Sun 12/7

9:40 am-5:17 pm

2 stops46h 37m

$786

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 10/23

6:45 am-9:45 pm

2 stops25h 00m

Bangkok Suvarnabhumi

Thu 11/20

9:40 am-5:17 pm

2 stops22h 37m

$800

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 11/3

9:45 pm-12:35 pm

1 stop23h 50m

Bangkok Suvarnabhumi

Mon 11/17

1:45 pm-3:50 pm

1 stop17h 05m

$807

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 9/2

6:50 pm-4:35 am

2 stops43h 45m

Bangkok Suvarnabhumi

Thu 9/11

9:35 am-8:33 pm

2 stops24h 58m

$822

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 11/3

10:45 pm-9:50 am

1 stop20h 05m

Bangkok Suvarnabhumi

Sun 11/16

2:35 am-4:50 pm

1 stop29h 15m

$824

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 8/3

12:45 am-10:20 am

1 stop19h 35m

Chiang Mai

Tue 9/23

11:20 am-6:00 pm

1 stop20h 40m

$872

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Wed 11/19

6:43 am-9:40 pm

2 stops23h 57m

Phuket City

Wed 11/26

11:20 pm-5:17 pm

2 stops32h 57m

$900

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Fri 11/21

9:45 pm-11:55 pm

2 stops35h 10m

Phuket City

Mon 12/1

7:30 am-3:50 pm

2 stops23h 20m

$901

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 8/16

6:00 am-9:45 pm

2 stops25h 45m

Bangkok Suvarnabhumi

Sun 9/28

2:35 am-5:17 pm

2 stops28h 42m

$913

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 8/3

6:25 am-9:55 pm

2 stops25h 30m

Chiang Mai

Wed 9/24

11:15 pm-10:42 pm

2 stops37h 27m

$914

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 40 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 $953). 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 June 12, 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 June 12, 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
178 reviews

Boarding

9.0

Comfort

9.0

Entertainment

8.9

Overall

9.1

Food

8.8

Crew

9.3

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
STARLUX Airlines
9.1
Wonderful
178 reviews
STARLUX Airlines
9.1
Wonderful
178 reviews

Boarding

9.0

Comfort

9.0

Entertainment

8.9

Overall

9.1

Food

8.8

Crew

9.3

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
EVA Air
8.4
Very good
1,202 reviews
STARLUX Airlines
9.1
Wonderful
178 reviews

Boarding

9.0

Comfort

9.0

Entertainment

8.9

Overall

9.1

Food

8.8

Crew

9.3

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
Korean Air
8.4
Very good
1,088 reviews
STARLUX Airlines
9.1
Wonderful
178 reviews

Boarding

9.0

Comfort

9.0

Entertainment

8.9

Overall

9.1

Food

8.8

Crew

9.3

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
Japan Airlines
8.3
Very good
1,490 reviews
STARLUX Airlines
9.1
Wonderful
178 reviews

Boarding

9.0

Comfort

9.0

Entertainment

8.9

Overall

9.1

Food

8.8

Crew

9.3

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.
China Airlines
8.3
Very good
738 reviews
STARLUX Airlines
9.1
Wonderful
178 reviews

Boarding

9.0

Comfort

9.0

Entertainment

8.9

Overall

9.1

Food

8.8

Crew

9.3

Reviews

1 / 7
10.0
Excellent

ltulagan,Jun 2025

TPE - SEA

The whole trip was very pleasant from the crew, the food, the amenities during the flight.

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 $432 on Korean Air. Other airlines that offer cheap prices include United Airlines from $454 and STARLUX Airlines from $459 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 $953). 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$783Average$833FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,013FlexibilityNo cancel feeOn-time69%
China AirlinesCheapest$796Average$930FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$814Average$900FlexibilityNo cancel feeOn-timeN/A

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