$314 Find Cheap Flights from Ontario to Bangkok

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Bangkok departing on 1/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Bangkok

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Bangkok, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Bangkok, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$719
Overall average: $837
United Airlines
Tue 3/3Tue 3/10
ONT - BKK • 2 stops
Cheapest one-way
$314
Typical prices: $412-$564
Delta
Mon 1/26
ONT - BKK • 2 stops
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Bangkok (ONT-BKK)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Bangkok that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Bangkok

Tue, Mar 3 - Tue, Mar 10
United Airlines Logo
6:10 am - 5:10 am
ONT
-
BKK
32h 00m
2 stops
United Airlines Logo
7:10 am - 5:41 pm
BKK
-
ONT
24h 31m
2 stops
$719United Airlines
Thu, Apr 16 - Thu, Apr 30
United Airlines Logo
11:05 am - 9:35 am
ONT
-
BKK
32h 30m
2 stops
United Airlines Logo
9:35 am - 10:59 pm
BKK
-
ONT
27h 24m
2 stops
$724United Airlines
Sat, Apr 11 - Thu, May 21
United Airlines Logo
6:00 am - 11:55 pm
ONT
-
BKK
27h 55m
2 stops
United Airlines Logo
7:00 am - 5:47 pm
BKK
-
ONT
24h 47m
2 stops
$727United Airlines
Fri, Apr 17 - Thu, Apr 30
United Airlines Logo
6:00 am - 9:35 am
ONT
-
BKK
37h 35m
2 stops
United Airlines Logo
9:35 am - 10:59 pm
BKK
-
ONT
27h 24m
2 stops
$729United Airlines
Wed, May 6 - Sun, May 17
United Airlines Logo
6:59 pm - 9:35 am
ONT
-
BKK
48h 36m
2 stops
United Airlines Logo
9:35 am - 10:59 pm
BKK
-
ONT
51h 24m
2 stops
$730United Airlines
Sat, Feb 28 - Thu, Apr 30
United Airlines Logo
1:53 pm - 11:25 am
ONT
-
BKK
54h 32m
2 stops
United Airlines Logo
9:35 am - 10:59 pm
BKK
-
ONT
27h 24m
2 stops
$735United Airlines
Mon, Mar 2 - Tue, Mar 31
Delta Logo
6:00 am - 12:45 am
ONT
-
BKK
27h 45m
2 stops
Delta Logo
9:40 pm - 5:13 pm
BKK
-
ONT
33h 33m
2 stops
$736Delta
Sun, Mar 8 - Sun, Mar 22
Delta Logo
6:00 am - 12:45 am
ONT
-
BKK
28h 45m
2 stops
Delta Logo
2:05 am - 5:13 pm
BKK
-
ONT
29h 08m
2 stops
$739Delta
Thu, Apr 9 - Fri, May 1
Delta Logo
6:00 am - 11:40 pm
ONT
-
BKK
27h 40m
2 stops
Delta Logo
9:40 pm - 5:15 pm
BKK
-
ONT
33h 35m
2 stops
$740Delta
Tue, Apr 7 - Wed, Apr 22
Multiple Airlines Logo
12:10 am - 4:20 pm
ONT
-
DMK
26h 10m
1 stop
Multiple Airlines Logo
7:25 am - 6:00 pm
DMK
-
ONT
24h 35m
1 stop
$964Multiple Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Bangkok flights

Get data-powered insights and trends into flights from Ontario to Bangkok to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to Bangkok?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Bangkok, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Bangkok is January, where tickets cost $769 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,452 and $1,337 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Bangkok, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to Bangkok, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Cheapest flight$314
Flight from Ontario to Bangkok Suvarnabhumi Airport

When to book flights from Ontario to Bangkok

Are your dates flexible? Find out the best times to travel from Ontario to Bangkok based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Bangkok

  • What is the cheapest flight from Ontario to Bangkok?

    In the last 3 days, the lowest price for a flight from Ontario to Bangkok was $314 for a one-way ticket and $719 for a round-trip.

  • Do I need a passport to fly between Ontario and Bangkok?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Ontario and on arrival in Bangkok.

  • Which airports will I be using when flying from Ontario to Bangkok?

    When flying out of Ontario you will be using Ontario. You will be landing at one of these airports: Bangkok Suvarnabhumi or Bangkok Don Mueang Intl.

  • Which aircraft models fly most regularly from Ontario to Bangkok?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Bangkok?

    SkyTeam is the only airline alliance operating flights between Ontario and Bangkok.

  • What is the most popular layover when flying to Bangkok from Ontario?

    Taipei City is the most popular layover city among KAYAK users traveling from Ontario to Bangkok.

  • How does KAYAK find such low prices on flights from Ontario to Bangkok?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Bangkok.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Bangkok?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bangkok from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Bangkok?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Bangkok with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Bangkok?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Bangkok from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Ontario to Bangkok

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Bangkok. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Bangkok? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.9
STARLUX AirlinesOverall score based on 267 reviews
9.1Crew
8.9Boarding
8.8Entertainment
8.8Comfort
8.6Food
Airline reviews

Majority of the movie entertainment loaded in the aircraft were quite old.

10.0 ExcellentAnonymous, Jan 2026
TPE - ONT
Read more STARLUX Airlines reviews

Majority of the movie entertainment loaded in the aircraft were quite old.

Crew is very attentive. Another new airbus 350-900 plane. Very modern.

Passengers were confused and freaking out coz the flight information wasn’t showing on the board that was running with all the departing flights. B9 gate was still showing Cathay Pacific bound for HK 15:50 was on until 22:07. STARLUX staff cameater but didn’t let the passengers go in to pre departure area until 22:45 for the 23:30 boarding time

The aircraft is fairly new. The screen is big and it's great to enjoy movies on a long haul flight. However, the food quality , and drink and snack selections, have room for improvement.

Preboarding food selection is an excellent idea. On the other end I did know the choice. People in my area know the choice. It ends with I got my meal till most of them are half way to finish their meal.

Overall it’s good . However the food quality can be improved .

My luggage was forced open and broke the zipper. I received it in a huge STARLUX plastic bag. Unfortunately, I have a round trip ticket but might be my first and last with this airline

I went to the gate that showed on the flight board but they changed gates at the last minute and I missed my flight. I had to buy new ticket from EVA air to Manila and take 3 hour bus ride back to my home. Will never fly Starlux again!

Starlux was great service and awesome food and drinks👍🏼 will take starlux again for my next vacation👍🏼

Loved the boarding process. All airlines should board from the back to the front. Very efficient. Food was excellent, crew were great, seats were spacious and comfortable and the entertainment screen was the best I have seen.

The boarding process was efficient and quick. The seats were comfortable. The food was good. The service was excellent. We had a lovely flight from Seattle on Korean air

Flight crew was fantastic. The aircraft was meticulously cleaned at all times. The crew was continuously checking to see if the passengers were ok.

They were trying to get people to check luggage because the over head compartments were full but when we boarded there were lots of empty places that people could have put the luggage.

It was good, I liked the self-serve snacks but it was a little difficult to get the alcohol, which is understandable since I wouldn't want kids sneaking it.

Friendly flight attendants and gate agents. Very clean plane and food was good!

This was an amazing flight. The crew was great. The service was great. The food provided was great.

I was unable to select decent seats, and so I was stuck in the middle seat because it was selected for me

There was a lot of partial tv shows but not enough to last the flight. The food was incredible! The crew were so helpful and patient. Lots more space than what I usually get on an international flight. Very comfortable!

Stingy on the drinks - 15 hour direct flight and could barely get attention for some water

Not many people, so you can lay down on two seats

Flight attendants. Food, entertainment and most of all, be on time.

Very bad. They don’t allow group people to sit together by blocking most of seats and opening only single seat during online checking in. . By doing so, they can rip off customers at the check-in counter by collecting extra money if we want to sit together in the same row.

Hour late but understandable under the conditions. Taoyuan airport could have clearer signs language wise and more staff to help direct people.

Delayed. Not a full flight and whole rows left open with the paid seating. Food was ok. My beef meal only had one cube of beef the rest carrot cubes. Entertainment on personal device but didn’t know about it until the flight was almost done.

We are glad to have used China Airlines for our trip. Continue the good service! Thank you!

The flight was uneventful and the crew was kind and professional. Really appreciate the option to order a vegan meal for the flight!

I love my Delta crew, they were so welcoming and helpful.

Overall was a lovely experience. The crew were kind and courteous throughout the entire flight.

Sat next to a woman who had her period. Blood was on her seat and on the arm rest between us. I ended up having period blood on my jacket and shoes. Very gross!

Better organization of boarding procedures. Terrible leadership guiding people to gates.

Everything you need to know for your flight from Ontario to Bangkok

Information on your arrival and departure airports