HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bangkok

$411+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
abr. 20 — abr. 271
dom. 4/20
dom. 4/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Bangkok with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to Bangkok are usually found in September or March, booked 63 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap 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 abril 15, 2025.

Round-trip from

$731
(Delta)

One-way from

$411
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$921
From Ontario to Bangkok
Search Deals
One-way flight from Ontario to Bangkok
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($335 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($51 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find 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 abril 15, 2025.

This CrystalTravel deal was found by Cheapflights users on 4/14. 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.
lun. 11/37:00 amONT - BKK
2 stops23h 30mKorean Air
dom. 11/161:00 amBKK - ONT
2 stops27h 18mKorean Air
Deal found 4/14$723
This Delta deal was found by Cheapflights users on 4/15. 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.
lun. 4/285:45 amONT - BKK
2 stops26h 00mDelta
lun. 5/1211:30 pmBKK - ONT
2 stops32h 50mDelta
Deal found 4/15$731
This oojo deal was found by Cheapflights users on 4/15. 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.
lun. 9/2212:10 amONT - BKK
1 stop22h 00mChina Airlines
jue. 10/91:20 pmBKK - ONT
1 stop18h 40mChina Airlines
Deal found 4/15$787
This United Airlines deal was found by Cheapflights users on 4/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/2010:00 amONT - BKK
2 stops23h 55mUnited Airlines
jue. 8/289:35 amBKK - ONT
2 stops27h 18mUnited Airlines
Deal found 4/15$804
This oojo deal was found by Cheapflights users on 4/13. 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.
mié. 8/2011:45 pmONT - BKK
1 stop26h 55mSTARLUX Airlines
mié. 9/31:10 pmBKK - ONT
1 stop17h 55mSTARLUX Airlines
Deal found 4/13$910
This oojo deal was found by Cheapflights users on 4/14. 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.
mar. 9/2311:39 amONT - BKK
2 stops28h 36mQatar Airways
mar. 9/308:00 pmBKK - ONT
2 stops41h 59mQatar Airways
Deal found 4/14$960
This Mytrip deal was found by Cheapflights users on 4/14. 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.
lun. 5/512:10 amONT - DMK
2 stops27h 25mMultiple Airlines
mar. 5/201:40 pmDMK - ONT
2 stops20h 40mMultiple Airlines
Deal found 4/14$1,006

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 abril 15, 2025.
Use the filters below to find and compare flights from Ontario to Bangkok that are best for you.

Fly from

Ontario

Fly to

Bangkok

Route

Depart

Return

Price

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

lun. 4/28

5:45 am-9:45 pm

2 stops26h 00m

Bangkok Suvarnabhumi

lun. 5/12

11:30 pm-6:20 pm

2 stops32h 50m

$731

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

mar. 4/29

5:45 am-11:40 pm

2 stops27h 55m

Bangkok Suvarnabhumi

lun. 5/26

2:35 am-6:20 pm

2 stops29h 45m

$754

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

lun. 9/22

12:10 am-9:45 am

1 stop19h 35m

Bangkok Suvarnabhumi

mié. 10/8

1:20 pm-6:00 pm

1 stop18h 40m

$787

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

mié. 8/20

10:00 am-11:55 pm

2 stops23h 55m

Bangkok Suvarnabhumi

jue. 8/28

9:35 am-10:53 pm

2 stops27h 18m

$804

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

sáb. 10/4

11:10 pm-12:00 pm

1 stop22h 50m

Bangkok Suvarnabhumi

sáb. 10/18

1:10 pm-5:05 pm

1 stop17h 55m

$908

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

mar. 9/23

11:39 am-6:15 am

2 stops28h 36m

Bangkok Suvarnabhumi

mar. 9/30

8:00 pm-11:59 pm

2 stops41h 59m

$960

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

dom. 5/4

8:24 am-9:10 pm

2 stops46h 46m

Bangkok Suvarnabhumi

mar. 5/20

5:30 pm-8:20 pm

1 stop16h 50m

$990

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

lun. 5/5

12:10 am-5:35 pm

2 stops27h 25m

Bangkok Don Mueang Intl

mar. 5/20

1:40 pm-8:20 pm

2 stops20h 40m

$1,006

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

dom. 5/4

8:24 am-9:10 pm

2 stops46h 46m

$411

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

lun. 4/28

6:00 am-4:35 am

2 stops32h 35m

$418

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 18 results
1
2

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 11, 2025.

Booking 63 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, March is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $958). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,574). 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.

What is the cheapest time of day to fly from ONT to BKK?

Find hourly flight availability from Ontario to Bangkok. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 15, 2025.

It’s typically best to fly out from Ontario to Bangkok in the morning. Doing so could potentially save you 29% on the flight price compared to flying in the afternoon, which is usually more expensive.

Rainfall in Bangkok by month

Plan your trip to Bangkok by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Bangkok ranges from 0.4 - 12.6 inches per month. September is typically the wettest month, when rainfall can reach 12.6 in. January is typically the driest time to visit Bangkok when rainfall is around 0.4 in.

Temperature in Bangkok by month

Plan your trip to Bangkok by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Bangkok, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 86.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).

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 abril 15, 2025.
See what other customers who have flown with STARLUX Airlines, EVA Air and Korean Air from Ontario to Bangkok have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
STARLUX Airlines
9.1
Wonderful
154 reviews

Boarding

9.0

Entertainment

9.0

Comfort

9.0

Overall

9.1

Crew

9.3

Food

8.9

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
STARLUX Airlines
9.1
Wonderful
154 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Boarding

9.0

Entertainment

9.0

Comfort

9.0

Overall

9.1

Crew

9.3

Food

8.9

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
EVA Air
8.4
Very good
1,176 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Boarding

9.0

Entertainment

9.0

Comfort

9.0

Overall

9.1

Crew

9.3

Food

8.9

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
Korean Air
8.4
Very good
1,063 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Boarding

9.0

Entertainment

9.0

Comfort

9.0

Overall

9.1

Crew

9.3

Food

8.9

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
Japan Airlines
8.3
Very good
1,440 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Boarding

9.0

Entertainment

9.0

Comfort

9.0

Overall

9.1

Crew

9.3

Food

8.9

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.
China Airlines
8.2
Very good
729 reviews
STARLUX Airlines
9.1
Wonderful
154 reviews

Boarding

9.0

Entertainment

9.0

Comfort

9.0

Overall

9.1

Crew

9.3

Food

8.9

Reviews

1 / 5
10.0
Excellent

Andrew,Jan 2025

LAX - TPE

Crew were attentive from start to finish. Each meal was amazing. IFE screen was huge and had quite a bit of western movies, however the tv shows were lacking.

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.

  • 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 $731 on this airline. Additional options worth looking into are Korean Air and China Airlines, starting at $754 and $787 round-trip. Delta is priced at 31% 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 United Airlines, with whom users have recently found tickets for as low as $418. 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, March is the cheapest month in which you can book a flight from Ontario to Bangkok (average of $958). Flying from Ontario to Bangkok in December is currently the most expensive (average of $1,574). 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.

Alternative routes for Ontario to Bangkok

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Suvarnabhumi flights
San Francisco to Suvarnabhumi flights
Ontario to Suvarnabhumi flights
Burbank to Suvarnabhumi flights
Santa Ana to Suvarnabhumi flights
Las Vegas to Suvarnabhumi flights
San Jose to Suvarnabhumi flights
Los Angeles to Don Mueang Intl flights
Oakland to Suvarnabhumi flights
San Diego to Suvarnabhumi flights
Los Angeles to Phuket City flights
San Francisco to Don Mueang Intl flights
San Francisco to Phuket City flights
San Francisco to Chiang Mai flights
San Jose to Phuket City flights
Sacramento to Suvarnabhumi flights
Oakland to Phuket City flights
Los Angeles to Chiang Mai flights
Ontario to Phuket City flights
Burbank to Phuket City flights
Santa Ana to Phuket City flights
Ontario to Chiang Mai flights
Reno to Suvarnabhumi flights
Santa Rosa to Suvarnabhumi flights
Santa Ana to Chiang Mai flights
Las Vegas to Don Mueang Intl flights
Long Beach to Suvarnabhumi flights
Burbank to Chiang Mai flights
Los Angeles to Ko Samui flights
Los Angeles to Krabi flights
San Francisco to Ko Samui flights
Fresno to Suvarnabhumi flights
San Jose to Chiang Mai flights
San Diego to Phuket City flights
Las Vegas to Phuket City flights
Oakland to Chiang Mai flights
San Francisco to Krabi flights
San Diego to Don Mueang Intl flights
San Jose to Don Mueang Intl flights
Sacramento to Phuket City flights
Santa Ana to Krabi flights
Palm Springs to Suvarnabhumi flights
Las Vegas to Chiang Mai flights
San Francisco to Lampang flights
San Jose to Ko Samui flights
San Diego to Chiang Mai flights
San Diego to Krabi flights

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 abril 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$785Average$826FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
DeltaCheapest$807Average$809FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$828Average$928FlexibilityNo cancel feeOn-time70%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.