HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bangkok

$454+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BKK
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
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 March 25, 2025.

Round-trip from

$816
(Trip.com)

One-way from

$454
(United Airlines)

Popular in

June

Cheapest in

September

Average price

$874
From Ontario to Bangkok
Search Deals
One-way flight from Ontario to Bangkok
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($318 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 25, 2025.

This FlightHub deal was found by Cheapflights users on 3/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/245:45 amONT - BKK
2 stops27h 55mKorean Air
Sun 5/49:50 amBKK - ONT
2 stops44h 54mKorean Air
Deal found 3/24$783
This Delta deal was found by Cheapflights users on 3/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/215:45 amONT - BKK
2 stops26h 00mDelta
Sat 5/249:50 amBKK - ONT
2 stops22h 30mDelta
Deal found 3/24$787
This Korean Air deal was found by Cheapflights users on 3/24. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:00 amONT - BKK
2 stops25h 20mMultiple Airlines
Wed 11/269:30 pmBKK - ONT
2 stops30h 53mMultiple Airlines
Deal found 3/24$830
This Gotogate deal was found by Cheapflights users on 3/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/412:10 amONT - BKK
1 stop26h 10mChina Airlines
Sun 5/185:30 pmBKK - ONT
1 stop38h 30mChina Airlines
Deal found 3/24$837
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1910:00 amONT - BKK
2 stops23h 55mUnited Airlines
Tue 9/97:00 amBKK - ONT
2 stops24h 42mUnited Airlines
Deal found 3/24$867
This Gurufare deal was found by Cheapflights users on 3/24. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1211:10 pmONT - BKK
1 stop27h 30mSTARLUX Airlines
Sun 10/55:50 pmBKK - ONT
1 stop37h 15mSTARLUX Airlines
Deal found 3/24$901
This oojo deal was found by Cheapflights users on 3/24. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:00 amONT - BKK
2 stops35h 20mQatar Airways
Wed 10/88:00 pmBKK - ONT
2 stops40h 37mQatar Airways
Deal found 3/24$960
This Mytrip deal was found by Cheapflights users on 3/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/412:10 amONT - DMK
2 stops27h 25mMultiple Airlines
Sun 5/187:30 amDMK - ONT
2 stops24h 30mMultiple Airlines
Deal found 3/24$1,079

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 March 25, 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

Thu 4/24

5:45 am-11:40 pm

2 stops27h 55m

Bangkok Suvarnabhumi

Sun 5/4

9:50 am-4:44 pm

2 stops44h 54m

$783

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 4/21

5:45 am-9:45 pm

2 stops26h 00m

Bangkok Suvarnabhumi

Sat 5/24

9:50 am-6:20 pm

2 stops22h 30m

$787

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 9/15

12:10 am-4:20 pm

1 stop26h 10m

Bangkok Suvarnabhumi

Wed 9/24

1:20 pm-6:00 pm

1 stop18h 40m

$828

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Tue 8/19

10:00 am-11:55 pm

2 stops23h 55m

Bangkok Suvarnabhumi

Tue 9/9

7:00 am-5:42 pm

2 stops24h 42m

$867

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 9/12

11:10 pm-4:40 pm

1 stop27h 30m

Bangkok Suvarnabhumi

Sun 10/5

5:50 pm-5:05 pm

1 stop37h 15m

$901

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Sun 4/20

8:15 am-11:50 pm

2 stops25h 35m

Bangkok Suvarnabhumi

Sun 5/25

1:20 pm-6:00 pm

1 stop18h 40m

$984

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 9/12

11:39 am-7:20 am

2 stops29h 41m

Bangkok Suvarnabhumi

Mon 9/22

8:00 pm-11:59 pm

2 stops41h 59m

$1,038

OntarioBangkok

ONT - DMK

ONTDMK

Ontario

Sun 5/4

12:10 am-5:35 pm

2 stops27h 25m

Bangkok Don Mueang Intl

Sun 5/18

7:30 am-6:00 pm

2 stops24h 30m

$1,079

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Mon 5/5

1:45 pm-4:35 am

2 stops48h 50m

$454

OntarioBangkok

ONT - BKK

ONTBKK

Ontario

Fri 4/25

8:10 am-11:50 pm

2 stops25h 40m

$465

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

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 March 21, 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 $963). 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 March 25, 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 March 25, 2025.
See what other customers who have flown with STARLUX Airlines, Korean Air and China Airlines 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
144 reviews

Boarding

9.0

Comfort

9.0

Entertainment

9.0

Overall

9.1

Food

8.9

Crew

9.3

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
144 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Comfort

9.0

Entertainment

9.0

Overall

9.1

Food

8.9

Crew

9.3

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
1,047 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Comfort

9.0

Entertainment

9.0

Overall

9.1

Food

8.9

Crew

9.3

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
723 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Comfort

9.0

Entertainment

9.0

Overall

9.1

Food

8.9

Crew

9.3

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.
Delta
8.0
Very good
7,890 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Comfort

9.0

Entertainment

9.0

Overall

9.1

Food

8.9

Crew

9.3

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.
Qatar Airways
7.4
Good
3,540 reviews
STARLUX Airlines
9.1
Wonderful
144 reviews

Boarding

9.0

Comfort

9.0

Entertainment

9.0

Overall

9.1

Food

8.9

Crew

9.3

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 Korean Air. Our recent data shows that you can find tickets from as low as $816 on this airline. Additional options worth looking into are China Airlines and United Airlines, starting at $828 and $864 round-trip. Korean Air is priced at 22% 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 $454. However, be on the lookout for offers from China Airlines and Delta, 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 $963). 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
San Jose to Suvarnabhumi flights
Los Angeles to Don Mueang Intl flights
Santa Ana to Suvarnabhumi flights
Las Vegas to Suvarnabhumi flights
Oakland to Suvarnabhumi flights
Burbank to Suvarnabhumi flights
San Francisco to Don Mueang Intl flights
Los Angeles to Phuket City flights
San Diego to Suvarnabhumi flights
Los Angeles to Chiang Mai flights
San Francisco to Chiang Mai flights
San Francisco to Phuket City flights
Sacramento to Suvarnabhumi flights
Ontario to Phuket City flights
Santa Rosa to Suvarnabhumi flights
San Jose to Phuket City flights
Santa Ana to Phuket City flights
Oakland to Phuket City flights
Long Beach to Suvarnabhumi flights
Los Angeles to Ko Samui flights
Burbank to Phuket City flights
Medford to Suvarnabhumi flights
Las Vegas to Don Mueang Intl flights
Reno to Suvarnabhumi flights
Ontario to Chiang Mai flights
Las Vegas to Phuket City flights
San Jose to Chiang Mai flights
Los Angeles to Krabi flights
Santa Ana to Chiang Mai flights
San Francisco to Ko Samui flights
San Diego to Phuket City flights
Palm Springs to Suvarnabhumi flights
Fresno to Suvarnabhumi flights
Sacramento to Phuket City flights
San Jose to Don Mueang Intl flights
San Diego to Ko Samui flights
Las Vegas to Chiang Mai flights
San Diego to Don Mueang Intl flights
Oakland to Chiang Mai flights
San Francisco to Krabi flights
Las Vegas to Ko Samui flights
Los Angeles to Lampang flights
San Francisco to Surat Thani 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 March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$785Average$871FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$795Average$1,035FlexibilityNo cancel feeOn-time69%
DeltaCheapest$807Average$995FlexibilityNo cancel feeOn-timeN/A
China AirlinesCheapest$827Average$931FlexibilityNo 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.