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$307+ 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 4/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Feb 5 — Feb 121
Thu 2/5
Thu 2/12
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 January 6, 2026.

Round-trip from

$610
(Delta)

One-way from

$307
(iWofly)

Popular in

June

Cheapest in

September

Average price

$742
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. 16% potential increase in price ($162 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 6, 2026.

This Delta deal was found by Cheapflights users on 1/6. 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 2/247:30 amONT - CNX
2 stops24h 25mDelta
Sun 3/812:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$610
This Delta deal was found by Cheapflights users on 1/6. 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 2/287:30 amONT - CNX
2 stops24h 25mDelta
Sun 3/812:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$615
This Delta deal was found by Cheapflights users on 1/6. 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 3/11:10 pmONT - CNX
2 stops42h 45mDelta
Sun 3/812:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$616
This Delta deal was found by Cheapflights users on 1/6. 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 2/233:30 pmONT - CNX
2 stops40h 25mDelta
Sun 3/812:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$617
This Delta deal was found by Cheapflights users on 1/6. 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 2/287:30 amONT - CNX
2 stops24h 25mDelta
Thu 3/1212:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$619
This Delta deal was found by Cheapflights users on 1/6. 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 3/15:00 pmONT - CNX
2 stops38h 55mDelta
Thu 3/1212:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$621
This Delta deal was found by Cheapflights users on 1/6. 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 2/263:30 pmONT - CNX
2 stops40h 25mDelta
Sun 3/812:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$622
This Delta deal was found by Cheapflights users on 1/6. 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 2/263:30 pmONT - CNX
2 stops40h 25mDelta
Thu 3/1212:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$626
This Delta deal was found by Cheapflights users on 1/5. 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 1/203:30 pmONT - CNX
2 stops40h 25mDelta
Mon 2/212:15 amCNX - ONT
2 stops28h 41mDelta
Deal found 1/5$666
This Delta deal was found by Cheapflights users on 1/6. 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 2/247:30 amONT - CNX
2 stops24h 25mDelta
Thu 3/512:15 amCNX - ONT
2 stops38h 34mDelta
Deal found 1/6$695
This Delta deal was found by Cheapflights users on 1/6. 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 3/11:10 pmONT - CNX
2 stops42h 45mDelta
Tue 3/1012:15 amCNX - ONT
2 stops36h 18mDelta
Deal found 1/6$701
This Delta deal was found by Cheapflights users on 1/6. 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 2/247:30 amONT - CNX
2 stops24h 25mDelta
Mon 3/912:15 amCNX - ONT
2 stops50h 08mDelta
Deal found 1/6$702

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 January 6, 2026.
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

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Fri 2/27

3:30 pm-10:55 pm

2 stops40h 25m

Chiang Mai

Sun 3/8

12:15 am-10:33 pm

2 stops36h 18m

$622

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Tue 1/20

3:30 pm-10:55 pm

2 stops40h 25m

Chiang Mai

Mon 2/2

12:15 am-1:56 pm

2 stops28h 41m

$666

OntarioChiang Mai

ONT - CNX

ONTCNX

Ontario

Wed 2/25

1:10 pm-10:55 pm

2 stops42h 45m

Chiang Mai

Sun 3/8

12:15 am-10:33 pm

2 stops36h 18m

$702

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 4/13

7:30 am-10:10 pm

2 stops24h 40m

Phuket City

Wed 4/29

11:25 pm-10:37 pm

2 stops37h 12m

$710

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 1/26

6:00 am-10:10 pm

2 stops25h 10m

Phuket City

Tue 2/3

11:40 pm-10:44 pm

2 stops38h 04m

$710

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Mon 3/2

6:00 am-10:10 pm

2 stops25h 10m

Phuket City

Thu 3/12

11:40 pm-10:33 pm

2 stops36h 53m

$715

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Wed 4/15

7:30 am-10:10 pm

2 stops24h 40m

Phuket City

Sun 4/26

11:25 pm-5:15 pm

2 stops31h 50m

$716

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Wed 3/11

6:00 am-10:10 pm

2 stops26h 10m

Phuket City

Mon 3/16

11:40 pm-5:13 pm

2 stops31h 33m

$716

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Thu 4/16

7:30 am-10:10 pm

2 stops24h 40m

Phuket City

Sun 4/26

11:25 pm-5:15 pm

2 stops31h 50m

$716

OntarioPhuket City

ONT - HKT

ONTHKT

Ontario

Tue 4/14

7:30 am-10:10 pm

2 stops24h 40m

Phuket City

Sun 4/26

11:25 pm-5:15 pm

2 stops31h 50m

$716

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/3

Showing 1-10 of 60 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, January is the cheapest month in which you can book a flight from Ontario to Thailand (average of $511). 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 January 6, 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
255 reviews

Crew

9.1

Overall

8.9

Comfort

8.8

Boarding

8.9

Food

8.6

Entertainment

8.8

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
255 reviews
STARLUX Airlines
8.9
Very good
255 reviews

Crew

9.1

Overall

8.9

Comfort

8.8

Boarding

8.9

Food

8.6

Entertainment

8.8

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
1,188 reviews
STARLUX Airlines
8.9
Very good
255 reviews

Crew

9.1

Overall

8.9

Comfort

8.8

Boarding

8.9

Food

8.6

Entertainment

8.8

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
798 reviews
STARLUX Airlines
8.9
Very good
255 reviews

Crew

9.1

Overall

8.9

Comfort

8.8

Boarding

8.9

Food

8.6

Entertainment

8.8

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 24h 40m. Delta provides one of the quickest options available for as low as $716. The distance between Ontario and Thailand is about 8688 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 $378 on Korean Air. Other airlines that offer cheap prices include China Airlines from $406 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 $511). 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

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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 3 airlines flying from Ontario to Thailand

Discover the top 3 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 January 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$637Average$793FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$718Average$903FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$731Average$822FlexibilityNo cancel feeOn-timeN/A

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