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$321+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Apr 4 — Apr 111
Sat 4/4
Sat 4/11
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 March 5, 2026.

This Delta deal was found by Cheapflights users on 2/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:00 am
ONT
-
BKK
2 stops26h 35m
Delta
Wed 5/69:50 am
BKK
-
ONT
2 stops26h 47m
Delta
Deal found 2/28$612
This Korean Air deal was found by Cheapflights users on 2/28. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/106:00 am
ONT
-
BKK
2 stops25h 30m
Korean Air
Sun 4/2611:30 pm
BKK
-
ONT
2 stops31h 45m
Korean Air
Deal found 2/28$617
This Delta deal was found by Cheapflights users on 3/2. 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.
Mon 8/106:00 am
ONT
-
BKK
2 stops27h 35m
Delta
Thu 9/109:50 am
BKK
-
ONT
2 stops27h 54m
Delta
Deal found 3/2$623
This lol.travel deal was found by Cheapflights users on 3/2. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/207:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Sun 5/39:50 am
BKK
-
ONT
2 stops45h 25m
Korean Air
Deal found 3/2$631
This Delta deal was found by Cheapflights users on 2/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/197:00 am
ONT
-
BKK
2 stops26h 35m
Delta
Wed 5/69:50 am
BKK
-
ONT
2 stops26h 47m
Delta
Deal found 2/28$637
This Korean Air deal was found by Cheapflights users on 2/28. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:00 am
ONT
-
BKK
2 stops25h 30m
Korean Air
Mon 4/279:40 pm
BKK
-
ONT
2 stops33h 35m
Korean Air
Deal found 2/28$642
This Korean Air deal was found by Cheapflights users on 2/28. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/207:00 am
ONT
-
BKK
2 stops39h 25m
Korean Air
Sun 11/2912:55 am
BKK
-
ONT
2 stops31h 22m
Korean Air
Deal found 2/28$647
This iWofly deal was found by Cheapflights users on 3/2. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/137:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Wed 9/29:50 am
BKK
-
ONT
2 stops27h 54m
Korean Air
Deal found 3/2$650
This Kissandfly.com deal was found by Cheapflights users on 3/2. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/267:00 am
ONT
-
BKK
2 stops26h 35m
Korean Air
Sat 5/911:30 pm
BKK
-
ONT
2 stops31h 40m
Korean Air
Deal found 3/2$659
This Kissandfly.com deal was found by Cheapflights users on 3/3. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/197:00 am
ONT
-
BKK
2 stops26h 35m
Korean Air
Sun 5/39:40 pm
BKK
-
ONT
2 stops33h 35m
Korean Air
Deal found 3/3$660
This Delta deal was found by Cheapflights users on 3/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:00 am
ONT
-
BKK
2 stops26h 35m
Delta
Tue 5/129:50 am
BKK
-
ONT
2 stops21h 20m
Delta
Deal found 3/3$661
This Delta deal was found by Cheapflights users on 3/1. 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.
Sun 4/197:00 am
ONT
-
BKK
2 stops26h 35m
Delta
Wed 5/139:50 am
BKK
-
ONT
2 stops21h 20m
Delta
Deal found 3/1$662

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 March 5, 2026.

Round-trip from

$612
(Delta)

One-way from

$321
(Delta)

Popular in

June

Cheapest in

September

Average price

$721
From Ontario to Thailand
Search Deals
One-way flight from Ontario to Thailand
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($145 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 5, 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

Mon 3/9

6:00 am-9:30 pm

2 stops25h 30m

Bangkok Suvarnabhumi

Mon 4/27

9:40 pm-5:15 pm

2 stops33h 35m

$692

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 8/3

7:00 am-10:10 pm

2 stops25h 10m

Phuket City

Tue 9/1

11:25 pm-5:16 pm

2 stops31h 51m

$717

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 5/5

7:00 am-11:35 pm

2 stops26h 35m

Bangkok Suvarnabhumi

Sun 5/17

9:50 am-5:10 pm

2 stops21h 20m

$767

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Wed 8/19

7:00 am-10:10 pm

2 stops25h 10m

Phuket City

Wed 9/9

11:25 pm-5:16 pm

2 stops31h 51m

$771

OntarioKrabi

ONT - KBV

ONTKBV

Ontario

Wed 4/15

11:10 pm-8:45 am

2 stops43h 35m

Krabi

Wed 4/22

9:25 am-5:05 pm

2 stops21h 40m

$801

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Sat 8/15

12:45 am-10:20 am

1 stop19h 35m

Chiang Mai

Thu 8/27

11:20 am-6:40 pm

1 stop21h 20m

$812

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 4/14

7:00 am-9:45 pm

2 stops24h 45m

Bangkok Suvarnabhumi

Tue 4/28

9:40 pm-5:15 pm

2 stops33h 35m

$815
Quickest round-trip

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 4/6

11:10 pm-12:00 pm

1 stop22h 50m

Bangkok Suvarnabhumi

Sat 4/18

1:10 pm-5:05 pm

1 stop17h 55m

$820

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Tue 5/12

12:10 am-7:30 am

2 stops41h 20m

Chiang Mai

Sun 5/17

7:10 am-6:00 pm

2 stops48h 50m

$842

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 3/30

12:10 am-11:45 pm

2 stops33h 35m

Phuket City

Fri 5/1

7:30 am-6:00 pm

2 stops24h 30m

$877

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/1

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
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6

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, January is the cheapest month in which you can book a flight from Ontario to Thailand (average of $503). Flying from Ontario to Thailand in June is currently the most expensive (average of $748). 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.

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 5, 2026.
Peruse reviews from past customers who have flown with STARLUX Airlines, Korean Air, and China 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
279 reviews

Boarding

8.9

Overall

8.9

Entertainment

8.8

Food

8.7

Crew

9.2

Comfort

8.9

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.
STARLUX Airlines
8.9
Very good
279 reviews
STARLUX Airlines
8.9
Very good
279 reviews

Boarding

8.9

Overall

8.9

Entertainment

8.8

Food

8.7

Crew

9.2

Comfort

8.9

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.
Korean Air
8.4
Very good
1,195 reviews
STARLUX Airlines
8.9
Very good
279 reviews

Boarding

8.9

Overall

8.9

Entertainment

8.8

Food

8.7

Crew

9.2

Comfort

8.9

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.
China Airlines
8.3
Very good
809 reviews
STARLUX Airlines
8.9
Very good
279 reviews

Boarding

8.9

Overall

8.9

Entertainment

8.8

Food

8.7

Crew

9.2

Comfort

8.9

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.
Delta
7.9
Good
8,250 reviews
STARLUX Airlines
8.9
Very good
279 reviews

Boarding

8.9

Overall

8.9

Entertainment

8.8

Food

8.7

Crew

9.2

Comfort

8.9

Reviews

1 / 10
10.0
Excellent

Anonymous,Jan 2026

SEA - TPE

First time travelled with starlux and had best experience. Food was really good and crew is the best. Entertainment was also best. Having latest movies. I requested for isle seat at the last time and they provided me. Best airline service.

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 19h 35m. Korean Air provides one of the quickest options available for as low as $812. The distance between Ontario and Thailand is about 8060 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 $316 on Korean Air. Other airlines that offer cheap prices include China Airlines from $398 and STARLUX Airlines from $445 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, January is the cheapest month in which you can book a flight from Ontario to Thailand (average of $503). Flying from Ontario to Thailand in June is currently the most expensive (average of $748). 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 March 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$457Average$660FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$616Average$783FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$718Average$883FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$763Average$812FlexibilityNo cancel feeOn-timeN/A

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