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$448+ 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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Jul 2 — Jul 91
Thu 7/2
Thu 7/9
1 adult, Economy
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Cheap 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 2, 2026.

This lol.travel deal was found by Cheapflights users on 6/1. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/17:00 am
ONT
-
BKK
2 stops25h 20m
Korean Air
Mon 12/149:40 am
BKK
-
ONT
2 stops46h 37m
Korean Air
Deal found 6/1$863
This Delta deal was found by Cheapflights users on 6/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
ONT
-
BKK
2 stops25h 45m
Delta
Mon 9/711:30 pm
BKK
-
ONT
2 stops37h 10m
Delta
Deal found 6/2$890
This Delta deal was found by Cheapflights users on 5/31. 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 11/116:00 am
ONT
-
CNX
2 stops25h 55m
Delta
Sun 11/2212:15 am
CNX
-
ONT
2 stops32h 02m
Delta
Deal found 5/31$890
This Korean Air deal was found by Cheapflights users on 6/1. 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.
Tue 7/146:20 am
ONT
-
BKK
2 stops25h 25m
Korean Air
Wed 8/262:35 am
BKK
-
ONT
2 stops28h 46m
Korean Air
Deal found 6/1$895
This Korean Air deal was found by Cheapflights users on 5/31. 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 11/167:00 am
ONT
-
CNX
2 stops24h 55m
Korean Air
Sun 11/2212:15 am
CNX
-
ONT
2 stops32h 02m
Korean Air
Deal found 5/31$895
This Delta deal was found by Cheapflights users on 5/31. 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 8/3012:55 pm
ONT
-
BKK
2 stops44h 40m
Delta
Mon 9/72:35 am
BKK
-
ONT
2 stops34h 05m
Delta
Deal found 5/31$896
This SmartFares deal was found by Cheapflights users on 5/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:00 am
ONT
-
BKK
2 stops23h 30m
Korean Air
Mon 11/1611:15 pm
BKK
-
ONT
2 stops33h 02m
Korean Air
Deal found 5/28$899
This SmartFares deal was found by Cheapflights users on 5/28. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:00 am
ONT
-
BKK
2 stops23h 30m
Korean Air
Wed 12/212:55 am
BKK
-
ONT
2 stops31h 22m
Korean Air
Deal found 5/28$908
This SmartFares deal was found by Cheapflights users on 6/1. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/27:00 am
ONT
-
BKK
2 stops23h 30m
Korean Air
Tue 12/112:55 am
BKK
-
ONT
2 stops31h 22m
Korean Air
Deal found 6/1$914
This Delta deal was found by Cheapflights users on 6/1. 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.
Sat 9/56:00 am
ONT
-
BKK
2 stops25h 45m
Delta
Wed 9/309:50 am
BKK
-
ONT
2 stops26h 50m
Delta
Deal found 6/1$921
This Delta deal was found by Cheapflights users on 5/31. 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 11/156:00 am
ONT
-
CNX
2 stops25h 55m
Delta
Sun 11/2212:15 am
CNX
-
ONT
2 stops38h 33m
Delta
Deal found 5/31$921
This Korean Air deal was found by Cheapflights users on 5/29. 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 7/116:20 am
ONT
-
BKK
2 stops27h 15m
Korean Air
Mon 7/272:35 am
BKK
-
ONT
2 stops28h 46m
Korean Air
Deal found 5/29$926

Find 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 2, 2026.

Round-trip from

$890
(Delta)

One-way from

$448
(Trip.com)

Popular in

December

Cheapest in

March

Average price

$1,006
From Ontario to Thailand
Search Deals
One-way flight from Ontario to Thailand
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 2, 2026.
Use the filters below to find and compare flights from Ontario to Thailand that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 10/18

7:00 am-9:45 pm

2 stops24h 45m

Bangkok Suvarnabhumi

Tue 10/27

9:40 am-5:17 pm

2 stops21h 37m

$921

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sun 11/1

7:00 am-10:55 pm

2 stops24h 55m

Chiang Mai

Wed 11/4

12:15 am-5:17 pm

2 stops32h 02m

$926

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 7/19

6:20 am-9:45 pm

2 stops25h 25m

Bangkok Suvarnabhumi

Mon 8/17

2:35 am-5:21 pm

2 stops28h 46m

$945

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 10/15

7:00 am-9:45 pm

2 stops24h 45m

Bangkok Suvarnabhumi

Sat 10/24

9:50 am-5:17 pm

2 stops21h 27m

$952

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 11/16

7:00 am-9:30 pm

2 stops23h 30m

Bangkok Suvarnabhumi

Sun 12/6

11:15 pm-5:17 pm

2 stops33h 02m

$957

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Tue 8/4

6:20 am-10:10 pm

2 stops25h 50m

Phuket City

Sun 8/16

11:25 pm-5:21 pm

2 stops31h 56m

$995

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 9/23

1:56 pm-9:35 am

2 stops29h 39m

Bangkok Suvarnabhumi

Wed 10/7

9:35 am-8:16 pm

2 stops24h 41m

$1,003

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 7/24

6:20 am-9:45 pm

2 stops25h 25m

Bangkok Suvarnabhumi

Wed 8/12

2:35 am-5:21 pm

2 stops28h 46m

$1,015

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 11/23

6:00 am-12:20 am

2 stops27h 20m

Bangkok Suvarnabhumi

Thu 12/3

4:55 pm-11:06 pm

2 stops21h 11m

$1,017

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Tue 11/17

6:00 am-10:10 pm

2 stops25h 10m

Phuket City

Fri 11/20

11:40 pm-11:48 pm

2 stops39h 08m

$1,021

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/31

Showing 1-10 of 60 resultsSorted by cheapest first
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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, July is the cheapest month in which you can book a flight from Ontario to Thailand (average of $457). Flying from Ontario to Thailand in December is currently the most expensive (average of $732). 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.

How far ahead should I book a flight from Ontario to Thailand?

The best time to book flights from Ontario to Thailand is 81 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 2, 2026.
Peruse reviews from past customers who have flown with STARLUX Airlines,Korean Air, andChina Airlines 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
8.9
Very good
327 reviews

Food

8.6

Comfort

8.9

Entertainment

8.8

Overall

8.9

Boarding

8.9

Crew

9.1

Reviews

1 / 12
10.0
Excellent

ember j,Apr 2026

TPE - ONT

Amazing how an airline can elevate service by just modernizing structures such as the massage chairs in the boarding areas to the massive airbus with the rolls Royce engines with the electrochromatic windows ! And not to mention the flawless service of the aircrew even with the language difference. I’ll definitely fly with starlux again
STARLUX Airlines
8.9
Very good
327 reviews
STARLUX Airlines
8.9
Very good
327 reviews

Food

8.6

Comfort

8.9

Entertainment

8.8

Overall

8.9

Boarding

8.9

Crew

9.1

Reviews

1 / 12
10.0
Excellent

ember j,Apr 2026

TPE - ONT

Amazing how an airline can elevate service by just modernizing structures such as the massage chairs in the boarding areas to the massive airbus with the rolls Royce engines with the electrochromatic windows ! And not to mention the flawless service of the aircrew even with the language difference. I’ll definitely fly with starlux again
Korean Air
8.4
Very good
1,217 reviews
STARLUX Airlines
8.9
Very good
327 reviews

Food

8.6

Comfort

8.9

Entertainment

8.8

Overall

8.9

Boarding

8.9

Crew

9.1

Reviews

1 / 12
10.0
Excellent

ember j,Apr 2026

TPE - ONT

Amazing how an airline can elevate service by just modernizing structures such as the massage chairs in the boarding areas to the massive airbus with the rolls Royce engines with the electrochromatic windows ! And not to mention the flawless service of the aircrew even with the language difference. I’ll definitely fly with starlux again
China Airlines
8.3
Very good
828 reviews
STARLUX Airlines
8.9
Very good
327 reviews

Food

8.6

Comfort

8.9

Entertainment

8.8

Overall

8.9

Boarding

8.9

Crew

9.1

Reviews

1 / 12
10.0
Excellent

ember j,Apr 2026

TPE - ONT

Amazing how an airline can elevate service by just modernizing structures such as the massage chairs in the boarding areas to the massive airbus with the rolls Royce engines with the electrochromatic windows ! And not to mention the flawless service of the aircrew even with the language difference. I’ll definitely fly with starlux again
Delta
7.9
Good
8,398 reviews
STARLUX Airlines
8.9
Very good
327 reviews

Food

8.6

Comfort

8.9

Entertainment

8.8

Overall

8.9

Boarding

8.9

Crew

9.1

Reviews

1 / 12
10.0
Excellent

ember j,Apr 2026

TPE - ONT

Amazing how an airline can elevate service by just modernizing structures such as the massage chairs in the boarding areas to the massive airbus with the rolls Royce engines with the electrochromatic windows ! And not to mention the flawless service of the aircrew even with the language difference. I’ll definitely fly with starlux again

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.

  • How long is the flight from Ontario to Thailand?

    A quick flight from Ontario to Thailand can take about 24h 45m. Delta provides one of the quickest options available for as low as $921. The distance between Ontario and Thailand is about 8280 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $313 on Delta. Other airlines that offer cheap prices include Korean Air from $316 and China Airlines from $398 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, July is the cheapest month in which you can book a flight from Ontario to Thailand (average of $457). Flying from Ontario to Thailand in December is currently the most expensive (average of $732). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$457Average$666FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$616Average$788FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$717Average$1,158FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$763Average$824FlexibilityNo cancel feeOn-timeN/A

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