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$458+ Cheap flights from Ontario (ONT) to Bangkok

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Jun 25 — Jul 21
Thu 6/25
Thu 7/2
1 adult, Economy
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Cheap flight deals from Ontario to Bangkok

Cheapest flights from Ontario to Bangkok
Explore the most affordable flight options available from Ontario to Bangkok. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 26, 2026.

This Delta deal was found by Cheapflights users on 5/26. 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 8/316:20 am
ONT
-
BKK
2 stops28h 45m
Delta
Tue 9/89:50 am
BKK
-
ONT
2 stops26h 54m
Delta
Deal found 5/26$890
This Kissandfly.com deal was found by Cheapflights users on 5/23. 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.
Wed 7/156:20 am
ONT
-
BKK
2 stops27h 15m
Korean Air
Wed 10/2812:55 am
BKK
-
ONT
2 stops30h 22m
Korean Air
Deal found 5/23$894
This Delta deal was found by Cheapflights users on 5/23. 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 8/305:05 pm
ONT
-
BKK
2 stops40h 30m
Delta
Wed 9/92:35 am
BKK
-
ONT
2 stops34h 05m
Delta
Deal found 5/23$895
This SmartFares deal was found by Cheapflights users on 5/23. 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.
Tue 10/207:00 am
ONT
-
BKK
2 stops24h 45m
Korean Air
Wed 11/1111:15 pm
BKK
-
ONT
2 stops33h 02m
Korean Air
Deal found 5/23$906
This Delta deal was found by Cheapflights users on 5/26. 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 8/206:20 am
ONT
-
BKK
2 stops25h 25m
Delta
Fri 8/289:50 am
BKK
-
ONT
2 stops27h 44m
Delta
Deal found 5/26$921
This Delta deal was found by Cheapflights users on 5/23. 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 8/912:55 pm
ONT
-
BKK
2 stops42h 50m
Delta
Thu 8/272:35 am
BKK
-
ONT
2 stops34h 59m
Delta
Deal found 5/23$926
This Jetabroad deal was found by Cheapflights users on 5/22. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/126:20 am
ONT
-
BKK
2 stops25h 25m
Korean Air
Mon 7/272:35 am
BKK
-
ONT
2 stops28h 46m
Korean Air
Deal found 5/22$933
This SmartFares deal was found by Cheapflights users on 5/24. 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.
Sun 11/17:00 am
ONT
-
BKK
2 stops23h 30m
Korean Air
Mon 11/1611:15 pm
BKK
-
ONT
2 stops33h 02m
Korean Air
Deal found 5/24$942
This Korean Air deal was found by Cheapflights users on 5/23. 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 8/106:00 am
ONT
-
BKK
2 stops25h 45m
Korean Air
Wed 8/199:40 pm
BKK
-
ONT
2 stops33h 41m
Korean Air
Deal found 5/23$945
This Delta deal was found by Cheapflights users on 5/26. 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 10/157:00 am
ONT
-
BKK
2 stops26h 35m
Delta
Sat 10/319:40 am
BKK
-
ONT
2 stops21h 37m
Delta
Deal found 5/26$952
This Korean Air deal was found by Cheapflights users on 5/26. 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 11/287:00 am
ONT
-
BKK
2 stops26h 45m
Korean Air
Mon 12/1411:15 pm
BKK
-
ONT
2 stops33h 02m
Korean Air
Deal found 5/26$957
This Delta deal was found by Cheapflights users on 5/25. 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 11/2911:55 am
ONT
-
BKK
2 stops66h 35m
Delta
Tue 12/1511:15 pm
BKK
-
ONT
2 stops39h 33m
Delta
Deal found 5/25$958

Find flight deals from Ontario to Bangkok

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Bangkok (TH1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 26, 2026.

Round-trip from

$890
(Delta)

One-way from

$458
(Delta)

Popular in

December

Cheapest in

January

Average price

$1,131
From Ontario to Bangkok
Search Deals
One-way flight from Ontario to Bangkok
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($44 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Bangkok 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 May 26, 2026.
Use the filters below to find and compare flights from Ontario to Bangkok that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/7

6:20 am-9:45 pm

2 stops25h 25m

Bangkok Suvarnabhumi

Mon 11/16

9:40 am-10:43 pm

2 stops28h 03m

$952

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 10/18

7:00 am-11:35 pm

2 stops26h 35m

Bangkok Suvarnabhumi

Mon 11/9

9:30 pm-5:17 pm

2 stops34h 47m

$952

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 11/14

7:00 am-9:30 pm

2 stops23h 30m

Bangkok Suvarnabhumi

Wed 11/25

12:55 am-5:17 pm

2 stops31h 22m

$957

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 11/9

7:00 am-9:30 pm

2 stops23h 30m

Bangkok Suvarnabhumi

Wed 11/25

12:55 am-5:17 pm

2 stops31h 22m

$957

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 11/15

7:00 am-12:45 am

2 stops26h 45m

Bangkok Suvarnabhumi

Sun 12/6

9:30 pm-5:17 pm

2 stops34h 47m

$1,002

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 11/15

6:00 am-9:30 pm

2 stops24h 30m

Bangkok Suvarnabhumi

Sat 12/5

9:40 am-5:17 pm

2 stops22h 37m

$1,027

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 8/22

8:00 am-11:55 pm

2 stops25h 55m

Bangkok Suvarnabhumi

Sun 9/20

7:00 am-6:11 pm

2 stops25h 11m

$1,063

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 7/17

6:00 am-9:35 am

2 stops37h 35m

Bangkok Suvarnabhumi

Mon 7/27

9:35 am-10:37 pm

2 stops27h 02m

$1,065

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 10/21

9:39 am-4:35 am

2 stops28h 56m

Bangkok Suvarnabhumi

Tue 11/10

4:55 pm-11:06 pm

2 stops21h 11m

$1,086
Quickest round-trip

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Wed 11/11

6:53 pm-11:25 am

2 stops25h 32m

Bangkok Suvarnabhumi

Wed 11/25

7:10 am-12:20 pm

2 stops20h 10m

$1,118

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/23

Showing 1-10 of 48 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Bangkok

Have a flexible travel schedule? Discover the best time to fly to Bangkok 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 Bangkok

What is the cheapest month to book a flight from Ontario to Bangkok?

Currently, July is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $457). Flying from Ontario to Bangkok 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 much does it cost to fly round-trip from Ontario to Bangkok?

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

Booking 81 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Bangkok. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing Bangkok

Get insights into the airlines that provide service to Bangkok. 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 Bangkok. Reviews last updated May 26, 2026.
Read through reviews of airlines operating flights from Ontario to Bangkok, such as STARLUX Airlines,Korean Air, andChina Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
8.9
Very good
326 reviews

Boarding

8.9

Entertainment

8.8

Crew

9.2

Overall

8.9

Comfort

8.9

Food

8.6

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
326 reviews
STARLUX Airlines
8.9
Very good
326 reviews

Boarding

8.9

Entertainment

8.8

Crew

9.2

Overall

8.9

Comfort

8.9

Food

8.6

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
326 reviews

Boarding

8.9

Entertainment

8.8

Crew

9.2

Overall

8.9

Comfort

8.9

Food

8.6

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
826 reviews
STARLUX Airlines
8.9
Very good
326 reviews

Boarding

8.9

Entertainment

8.8

Crew

9.2

Overall

8.9

Comfort

8.9

Food

8.6

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
8,423 reviews
STARLUX Airlines
8.9
Very good
326 reviews

Boarding

8.9

Entertainment

8.8

Crew

9.2

Overall

8.9

Comfort

8.9

Food

8.6

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 Bangkok. 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 Bangkok?

    Located just 3.1 mi from the city center, Ontario is the airport most travelers will use when flying to Bangkok from Ontario. Booking flights from Ontario (ONT) to Bangkok should be relatively easy as there are 0 daily outbound flights to Bangkok from 4 different airlines.

  • How long is the flight from Ontario to Bangkok?

    For as low as $957, Delta can have you in Bangkok from Ontario in 23h 30m. Airlines will cover a distance of 8280 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Ontario to Bangkok round-trip?

    Our cheapest airline available from Ontario to Bangkok is Delta. Our recent data shows that you can find tickets from as low as $457 on this airline. Additional options worth looking into are Korean Air and China Airlines, starting at $616 and $717 round-trip. Delta is priced at 52% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Bangkok one-way?

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $313. However, be on the lookout for offers from Korean Air and China Airlines, as they are both options that can get you from Ontario to Bangkok for a low price.

  • Can I find deals for flights from Ontario to Bangkok that include hotel bookings?

    Yes. In addition to deals on Ontario to Bangkok flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Bangkok?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Bangkok.

  • Can I find deals for business class flights from Ontario to Bangkok?

    Yes. Cheapflights offers flight deals from Ontario to Bangkok 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 Bangkok?

    Currently, July is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $457). Flying from Ontario to Bangkok 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 Bangkok

Discover the top 4 airlines that operate flights from Ontario to Bangkok. 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 May 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$457Average$666FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$616Average$788FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$717Average$832FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$763Average$822FlexibilityNo cancel feeOn-timeN/A

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