Bangkok

$459+ 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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
May 9 — May 161
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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 April 9, 2026.

This SmartFares deal was found by Cheapflights users on 4/8. 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 9/1012:45 am
ONT
-
BKK
1 stop21h 25m
China Airlines
Fri 9/251:20 pm
BKK
-
ONT
1 stop18h 40m
China Airlines
Deal found 4/8$823
This Vliegwinkel deal was found by Cheapflights users on 4/7. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/612:10 am
ONT
-
BKK
1 stop35h 15m
China Airlines
Wed 5/205:30 pm
BKK
-
ONT
1 stop38h 30m
China Airlines
Deal found 4/7$825
This SmartFares deal was found by Cheapflights users on 4/7. 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 10/612:10 am
ONT
-
BKK
1 stop26h 10m
China Airlines
Tue 10/201:20 pm
BKK
-
ONT
1 stop18h 40m
China Airlines
Deal found 4/7$832
This oojo deal was found by Cheapflights users on 4/6. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2112:10 am
ONT
-
BKK
1 stop19h 35m
China Airlines
Sun 11/15:50 pm
BKK
-
ONT
1 stop38h 00m
China Airlines
Deal found 4/6$833
This SmartFares deal was found by Cheapflights users on 4/4. 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 10/2012:10 am
ONT
-
BKK
1 stop19h 35m
China Airlines
Wed 11/42:05 pm
BKK
-
ONT
1 stop17h 45m
China Airlines
Deal found 4/4$835
This oojo deal was found by Cheapflights users on 4/6. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/2612:10 am
ONT
-
BKK
1 stop19h 35m
China Airlines
Wed 5/131:20 pm
BKK
-
ONT
1 stop18h 40m
China Airlines
Deal found 4/6$839
This oojo deal was found by Cheapflights users on 4/8. 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.
Sat 5/912:10 am
ONT
-
BKK
1 stop19h 35m
China Airlines
Thu 5/141:20 pm
BKK
-
ONT
1 stop18h 40m
China Airlines
Deal found 4/8$840
This Gotogate deal was found by Cheapflights users on 4/4. 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.
Sun 10/1812:10 am
ONT
-
BKK
1 stop22h 00m
China Airlines
Mon 11/162:05 pm
BKK
-
ONT
1 stop17h 45m
China Airlines
Deal found 4/4$841
This Gotogate deal was found by Cheapflights users on 4/5. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/310:50 pm
ONT
-
BKK
1 stop23h 15m
China Airlines
Wed 11/252:05 pm
BKK
-
ONT
1 stop17h 45m
China Airlines
Deal found 4/5$845
This CrystalTravel deal was found by Cheapflights users on 4/8. 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.
Fri 10/3011:50 pm
ONT
-
BKK
1 stop20h 00m
China Airlines
Fri 11/132:05 pm
BKK
-
ONT
1 stop17h 45m
China Airlines
Deal found 4/8$848
This Gotogate deal was found by Cheapflights users on 4/4. 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.
Wed 10/2112:10 am
ONT
-
BKK
1 stop22h 00m
China Airlines
Sun 11/222:35 am
BKK
-
ONT
1 stop29h 15m
China Airlines
Deal found 4/4$850
This Mytrip deal was found by Cheapflights users on 4/7. 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.
Sun 4/2612:10 am
ONT
-
DMK
2 stops27h 25m
Multiple Airlines
Wed 5/67:30 am
DMK
-
ONT
2 stops24h 30m
Multiple Airlines
Deal found 4/7$1,096

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 April 9, 2026.

Round-trip from

$823
(SmartFares)

One-way from

$459
(iWofly)

Popular in

December

Cheapest in

January

Average price

$803
From Ontario to Bangkok
One-way flight from Ontario to Bangkok
Highest demand for flights based on searches. 4% potential increase in price ($47 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($43 potential savings vs. average RT price).
Average for round-trip flights in April 2026

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 April 9, 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
Quickest round-trip

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 5/2

12:10 am-9:45 am

1 stop19h 35m

Bangkok Suvarnabhumi

Fri 5/15

1:20 pm-6:00 pm

1 stop18h 40m

$955

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Thu 4/30

7:00 am-9:45 pm

2 stops24h 45m

Bangkok Suvarnabhumi

Tue 5/12

9:50 am-5:10 pm

2 stops21h 20m

$974

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 9/22

7:13 pm-9:35 am

2 stops24h 22m

Bangkok Suvarnabhumi

Tue 9/29

7:00 am-5:47 pm

2 stops24h 47m

$1,018

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 5/1

1:30 pm-9:35 am

2 stops54h 05m

Bangkok Suvarnabhumi

Thu 5/14

3:45 pm-10:59 pm

2 stops45h 14m

$1,034

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 9/26

12:10 am-9:25 pm

2 stops31h 15m

Bangkok Suvarnabhumi

Thu 10/1

1:20 pm-6:00 pm

1 stop18h 40m

$1,079

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 4/24

7:00 am-9:45 pm

2 stops24h 45m

Bangkok Suvarnabhumi

Sun 7/19

2:35 am-5:21 pm

2 stops28h 46m

$1,090

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sat 4/25

7:00 am-9:45 pm

2 stops24h 45m

Bangkok Suvarnabhumi

Sun 7/19

2:35 am-5:21 pm

2 stops28h 46m

$1,090

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Sun 4/26

12:10 am-5:35 pm

2 stops27h 25m

Bangkok Don Mueang Intl

Wed 5/6

7:30 am-6:00 pm

2 stops24h 30m

$1,096

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 5/11

12:10 am-9:45 am

1 stop19h 35m

Bangkok Suvarnabhumi

Tue 5/19

5:50 pm-6:00 pm

2 stops38h 10m

$1,117

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Sun 5/3

12:10 am-11:05 pm

2 stops32h 55m

Bangkok Don Mueang Intl

Mon 5/11

7:30 am-6:00 pm

2 stops24h 30m

$1,153

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/5

Showing 1-10 of 42 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

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Bangkok. Price data was last updated on April 3, 2026.

Booking 83 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.

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $503). Flying from Ontario to Bangkok in June is currently the most expensive (average of $747). 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?

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 April 9, 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.

Crew

9.2

Food

8.7

Entertainment

8.8

Comfort

8.9

Overall

8.9

Boarding

9.0

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.

Crew

9.2

Food

8.7

Entertainment

8.8

Comfort

8.9

Overall

8.9

Boarding

9.0

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.

Crew

9.2

Food

8.7

Entertainment

8.8

Comfort

8.9

Overall

8.9

Boarding

9.0

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.

Crew

9.2

Food

8.7

Entertainment

8.8

Comfort

8.9

Overall

8.9

Boarding

9.0

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.

Crew

9.2

Food

8.7

Entertainment

8.8

Comfort

8.9

Overall

8.9

Boarding

9.0

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 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 $955, China Airlines can have you in Bangkok from Ontario in 19h 35m. 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 Korean Air, with whom users have recently found tickets for as low as $316. However, be on the lookout for offers from China Airlines and STARLUX 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, January is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $503). Flying from Ontario to Bangkok in June is currently the most expensive (average of $747). 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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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 April 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$457Average$660FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$616Average$783FlexibilityNo cancel feeOn-time81%
China AirlinesCheapest$717Average$835FlexibilityNo cancel feeOn-time70%
STARLUX AirlinesCheapest$763Average$816FlexibilityNo cancel feeOn-timeN/A

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