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$420+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$735
(CrystalTravel)

One-way from

$420
(FlightHub)

Popular in

December

Cheapest in

March

Average price

$1,028
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 ($97 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 July 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 July 3, 2025.

This CrystalTravel deal was found by Cheapflights users on 7/3. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:43 amONT - BKK
2 stops25h 37mKorean Air
Tue 11/2511:15 pmBKK - ONT
2 stops33h 02mKorean Air
Deal found 7/3$735
This Delta deal was found by Cheapflights users on 7/1. 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 8/76:25 amONT - BKK
2 stops25h 20mDelta
Tue 8/269:50 amBKK - ONT
2 stops26h 50mDelta
Deal found 7/1$778
This CrystalTravel deal was found by Cheapflights users on 7/1. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/96:00 amONT - BKK
2 stops32h 35mUnited Airlines
Fri 10/107:00 amBKK - ONT
2 stops29h 42mUnited Airlines
Deal found 7/1$805
This Gotogate deal was found by Cheapflights users on 7/3. 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.
Sat 8/1612:45 amONT - BKK
1 stop19h 00mChina Airlines
Tue 9/210:50 amBKK - ONT
1 stop21h 50mChina Airlines
Deal found 7/3$815
This Korean Air deal was found by Cheapflights users on 7/1. 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.
Fri 8/296:00 amONT - CNX
2 stops25h 55mKorean Air
Sun 9/2811:15 pmCNX - ONT
2 stops31h 45mKorean Air
Deal found 7/1$825
This Delta deal was found by Cheapflights users on 6/30. 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 7/226:25 amONT - CNX
2 stops25h 30mDelta
Mon 7/2811:15 pmCNX - ONT
2 stops38h 27mDelta
Deal found 6/30$864
This oojo deal was found by Cheapflights users on 7/1. 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.
Sun 8/3112:45 amONT - CNX
1 stop19h 35mChina Airlines
Sat 9/2011:20 amCNX - ONT
1 stop20h 40mChina Airlines
Deal found 7/1$866
This Korean Air deal was found by Cheapflights users on 7/3. 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 10/276:45 amONT - HKT
2 stops24h 55mKorean Air
Sun 12/711:20 pmHKT - ONT
2 stops32h 57mKorean Air
Deal found 7/3$884
This Trip.com deal was found by Cheapflights users on 7/3. 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.
Mon 9/2212:10 amONT - HKT
2 stops33h 30mMultiple Airlines
Wed 10/18:55 amHKT - ONT
2 stops23h 05mMultiple Airlines
Deal found 7/3$893
This Trip.com deal was found by Cheapflights users on 6/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2812:10 amONT - KBV
2 stops30h 00mMultiple Airlines
Thu 10/169:00 amKBV - ONT
2 stops23h 00mMultiple Airlines
Deal found 6/30$927
This Korean Air deal was found by Cheapflights users on 7/2. 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 8/166:05 pmONT - CNX
2 stops37h 50mMultiple Airlines
Sat 8/2311:15 pmCNX - ONT
2 stops31h 56mMultiple Airlines
Deal found 7/2$943
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1012:45 amONT - DMK
1 stop21h 00mMultiple Airlines
Thu 9/187:25 amDMK - ONT
1 stop24h 35mMultiple Airlines
Deal found 7/3$1,033

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 July 3, 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 11/10

6:43 am-11:20 pm

2 stops25h 37m

Bangkok Suvarnabhumi

Tue 11/25

11:15 pm-5:17 pm

2 stops33h 02m

$735

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 8/7

6:25 am-9:45 pm

2 stops25h 20m

Bangkok Suvarnabhumi

Tue 8/26

9:50 am-10:40 pm

2 stops26h 50m

$778

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 9/9

6:00 am-4:35 am

2 stops32h 35m

Bangkok Suvarnabhumi

Fri 10/10

7:00 am-10:42 pm

2 stops29h 42m

$805

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 8/16

12:45 am-9:45 am

1 stop19h 00m

Bangkok Suvarnabhumi

Tue 9/2

10:50 am-6:40 pm

1 stop21h 50m

$815

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Fri 8/29

6:00 am-9:55 pm

2 stops25h 55m

Chiang Mai

Sun 9/28

11:15 pm-5:00 pm

2 stops31h 45m

$825

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Tue 7/22

6:25 am-9:55 pm

2 stops25h 30m

Chiang Mai

Mon 7/28

11:15 pm-11:42 pm

2 stops38h 27m

$864

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 8/31

12:45 am-10:20 am

1 stop19h 35m

Chiang Mai

Sun 9/28

11:20 am-6:00 pm

1 stop20h 40m

$866

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Thu 8/7

6:25 am-10:10 pm

2 stops25h 45m

Phuket City

Thu 8/21

11:25 pm-10:42 pm

2 stops37h 17m

$889

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 9/22

12:10 am-11:40 pm

2 stops33h 30m

Phuket City

Wed 10/1

8:55 am-6:00 pm

2 stops23h 05m

$893

OntarioKrabi

ONT - KBV

ONTKBV

Ontario

Sun 9/28

12:10 am-8:10 pm

2 stops30h 00m

Krabi

Thu 10/16

9:00 am-6:00 pm

2 stops23h 00m

$927

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 33 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 $952). Flying from Ontario to Thailand in December is currently the most expensive (average of $1,573). 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 July 3, 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 July 3, 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. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
9.1
Wonderful
189 reviews

Comfort

9.0

Food

8.9

Overall

9.1

Crew

9.3

Entertainment

9.0

Boarding

9.0

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
189 reviews
STARLUX Airlines
9.1
Wonderful
189 reviews

Comfort

9.0

Food

8.9

Overall

9.1

Crew

9.3

Entertainment

9.0

Boarding

9.0

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
1,215 reviews
STARLUX Airlines
9.1
Wonderful
189 reviews

Comfort

9.0

Food

8.9

Overall

9.1

Crew

9.3

Entertainment

9.0

Boarding

9.0

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
1,101 reviews
STARLUX Airlines
9.1
Wonderful
189 reviews

Comfort

9.0

Food

8.9

Overall

9.1

Crew

9.3

Entertainment

9.0

Boarding

9.0

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
744 reviews
STARLUX Airlines
9.1
Wonderful
189 reviews

Comfort

9.0

Food

8.9

Overall

9.1

Crew

9.3

Entertainment

9.0

Boarding

9.0

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.
Delta
8.0
Very good
7,982 reviews
STARLUX Airlines
9.1
Wonderful
189 reviews

Comfort

9.0

Food

8.9

Overall

9.1

Crew

9.3

Entertainment

9.0

Boarding

9.0

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 $420 on Korean Air. Other airlines that offer cheap prices include Delta from $434 and China Airlines from $473 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 $952). Flying from Ontario to Thailand in December is currently the most expensive (average of $1,573). 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

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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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$781Average$832FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$927FlexibilityNo cancel feeOn-time69%
China AirlinesCheapest$796Average$924FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$808Average$900FlexibilityNo cancel feeOn-timeN/A

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