$321 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 8/4. 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
$623
Overall average: $806
Delta
Mon 8/10Thu 9/10
ONT - BKK • 2 stops
Cheapest one-way
$321
Typical prices: $448-$464
Delta
Tue 8/4
ONT - BKK • 2 stops
Top airlines
Delta
Cheapest • from $623 (round-trip)
STARLUX Airlines
Best reviews • 8.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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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

Mon, Aug 10 - Thu, Sep 10
Delta Logo
6:00 am - 11:35 pm
ONT
-
BKK
27h 35m
2 stops
Delta Logo
9:50 am - 11:44 pm
BKK
-
ONT
27h 54m
2 stops
$623Delta
Mon, Apr 20 - Sun, May 3
Korean Air Logo
7:00 am - 9:45 pm
ONT
-
BKK
24h 45m
2 stops
Korean Air Logo
9:50 am - 5:15 pm
BKK
-
ONT
45h 25m
2 stops
$631Korean Air
Mon, Apr 20 - Mon, Apr 27
Korean Air Logo
7:00 am - 9:45 pm
ONT
-
BKK
24h 45m
2 stops
Korean Air Logo
9:40 pm - 5:15 pm
BKK
-
ONT
33h 35m
2 stops
$643Korean Air
Sun, Apr 26 - Sat, May 9
Korean Air Logo
7:00 am - 11:35 pm
ONT
-
BKK
26h 35m
2 stops
Korean Air Logo
11:30 pm - 5:10 pm
BKK
-
ONT
31h 40m
2 stops
$659Korean Air
Sun, Apr 19 - Sun, May 3
Korean Air Logo
7:00 am - 11:35 pm
ONT
-
BKK
26h 35m
2 stops
Korean Air Logo
9:40 pm - 5:15 pm
BKK
-
ONT
33h 35m
2 stops
$660Korean Air
Tue, Apr 21 - Wed, May 13
Delta Logo
7:00 am - 11:35 pm
ONT
-
BKK
26h 35m
2 stops
Delta Logo
9:50 am - 5:10 pm
BKK
-
ONT
21h 20m
2 stops
$661Delta
Tue, Aug 25 - Sun, Sep 6
Korean Air Logo
7:00 am - 9:45 pm
ONT
-
BKK
24h 45m
2 stops
Korean Air Logo
2:35 am - 5:16 pm
BKK
-
ONT
28h 41m
2 stops
$664Korean Air
Tue, Apr 21 - Fri, May 8
Delta Logo
7:00 am - 11:35 pm
ONT
-
BKK
26h 35m
2 stops
Delta Logo
9:50 am - 5:10 pm
BKK
-
ONT
21h 20m
2 stops
$666Delta
Tue, Apr 21 - Wed, May 6
Korean Air Logo
7:00 am - 11:35 pm
ONT
-
BKK
26h 35m
2 stops
Korean Air Logo
9:40 pm - 5:10 pm
BKK
-
ONT
33h 30m
2 stops
$667Korean Air
Sun, May 17 - Tue, Jun 2
Multiple Airlines Logo
12:10 am - 11:05 pm
ONT
-
DMK
32h 55m
2 stops
Multiple Airlines Logo
7:30 am - 6:00 pm
DMK
-
ONT
24h 30m
2 stops
$974Multiple 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 $764 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,424 and $1,331 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 6 weeks before departure.

Good to know

Cheapest flight$321
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 $321 for a one-way ticket and $623 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 4 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 279 reviews
8.9Boarding
9.2Crew
8.7Food
8.9Comfort
8.8Entertainment
Airline reviews

Leg room was great. Friendly crew. Food is great. Crew always kept the toilet clean.

10.0 ExcellentChris, Mar 2026
CRK - TPE
Read more STARLUX Airlines reviews

Leg room was great. Friendly crew. Food is great. Crew always kept the toilet clean.

Excellent. Airline was very clean, staff was excellent, very professional. Economy seats were still large and comfortable. Meals were included and with good options. We were given a blanket and pillow as well as a comfort kit including an eye mask, ear plugs, and tooth brush. Would highly recommend.

Business Class is exceptional, from the lie flat seats to the wide range of food on board. Can’t wait for our next journey with Starlux!

Th tray was dirty when pulled it out. Still oily and food stains can clearly see last trip cleaner did not clean well. The toilet sink water did not drain quickly enough.

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 .

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.

Flight was delayed by 3-hours and their fix was… complimentary pretzels.

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

Everything I mentioned earlier - the airbus was more comfortable indeed and the experience was further enhanced.

The plane was an older model, so it wasn’t as comfortable as others. The flight attendants were not helpful during onboarding. It was a full flight so there was chaos finding space for baggage.

Awesome! On time flight, early arrival, and a complimentary upgrade!

It was nt delta. It was aeromexo. Service was awful. They served a very small drink and NO snack for a 3hr and 35min flight. Then for the first 30 min of the flight is was talk and talk over head interruption the movie/ show i picked to watch.

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

Delta’s staff is unmatched. From the gate agents, to the pilots, to the flight attendants… all top of the industry.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

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

Information on your arrival and departure airports