$436 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 9/16. 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.
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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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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

Wed, Oct 29 - Sun, Nov 9
Korean Air Logo
7:00 am - 11:20 pmONT-BKK
26h 20m2 stops
Korean Air Logo
1:00 am - 5:17 pmBKK-ONT
31h 17m2 stops
$774Korean Air
Find Deal
Tue, Oct 21 - Thu, Oct 30
Delta Logo
7:00 am - 11:25 pmONT-BKK
26h 25m2 stops
Delta Logo
9:40 am - 10:42 pmBKK-ONT
27h 02m2 stops
$777Delta
Find Deal
Mon, Sep 22 - Sun, Oct 5
STARLUX Airlines Logo
11:10 pm - 12:00 pmONT-BKK
22h 50m1 stop
STARLUX Airlines Logo
5:50 pm - 5:05 pmBKK-ONT
37h 15m1 stop
$814STARLUX Airlines
Find Deal
Fri, Aug 29 - Mon, Sep 15
STARLUX Airlines Logo
11:45 pm - 12:00 pmONT-BKK
22h 15m1 stop
STARLUX Airlines Logo
1:10 pm - 5:05 pmBKK-ONT
17h 55m1 stop
$832STARLUX Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
United Airlines Logo
6:36 pm - 4:35 amONT-BKK
43h 59m2 stops
United Airlines Logo
9:35 am - 8:33 pmBKK-ONT
24h 58m2 stops
$862United Airlines
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Thu, Aug 21 - Mon, Sep 1
United Airlines Logo
6:00 am - 11:55 pmONT-BKK
27h 55m2 stops
United Airlines Logo
9:35 am - 8:33 pmBKK-ONT
24h 58m2 stops
$864United Airlines
Find Deal
Thu, Oct 16 - Sun, Oct 26
 Logo
6:00 am - 9:45 pmONT-BKK
25h 45m2 stops
 Logo
9:30 pm - 5:17 pmBKK-ONT
33h 47m2 stops
Mon, Aug 11 - Sun, Aug 24
China Airlines Logo
12:45 am - 4:20 pmONT-BKK
25h 35m1 stop
China Airlines Logo
5:30 pm - 6:40 pmBKK-ONT
39h 10m1 stop
$881China Airlines
Find Deal
Mon, Sep 8 - Tue, Sep 30
China Airlines Logo
12:45 am - 9:45 amONT-BKK
19h 00m1 stop
China Airlines Logo
1:20 pm - 6:00 pmBKK-ONT
18h 40m1 stop
$891China Airlines
Find Deal
Tue, Aug 12 - Sun, Aug 24
 Logo
4:00 pm - 12:00 pmONT-BKK
30h 00m2 stops
 Logo
5:50 pm - 5:40 pmBKK-ONT
37h 50m1 stop
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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’s the cheapest day of the week to fly from Ontario to Bangkok?

The average price of all round-trip flights from Ontario to Bangkok clicked on KAYAK for each day over the last 12 months.

When flying from Ontario to Bangkok, you should consider leaving on a Wednesday and avoid Fridays if you are looking for the best rates. For your return to Ontario, you’ll find the best rates on Thursdays and the most expensive ones on Fridays.

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 September, where tickets cost $868 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $1,504 and $1,459 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 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Good to know

Cheapest flight$436
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 $436 for a one-way ticket and $774 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, Star Alliance, and oneworld are the airline alliances operating flights between Ontario and Bangkok, with SkyTeam being the most commonly used for this route.

  • 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.

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.
8.4
Korean AirOverall score based on 1073 reviews
8.7Crew
8.3Comfort
8.1Food
8.5Boarding
8.2Entertainment
Airline reviews

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

6.0 GoodMaria, May 2025BOS - ICN
Read more Korean Air reviews

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

Unfortunately, there has been a boarding and departure delay. However, as usual, the flight arrived earlier than the scheduled. There has been a turbulence in-between, it’s unavoidable. I couldn’t complain them.

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

They did an excellent job helping me with a wheelchair. I couldn’t have asked for any better help.

The delay in Korea was a pain and set us back a day. I have to give big props to Korean Air for setting up a hotel with dinner and transportation to and from the hotel. I also needed assistance with a wheelchair and they did an outstanding job.

Great except for the delay in Korea. Korean Air did a great job setting up a hotel for the night. I also needed assistance with a wheelchair and they were outstanding.

The flight was on time and very quick, as expected, but the leg room isn't great in coach seats.

The boarding process for Korean airlines is very straightforward and easy. You've never met such helpful and friendly people. The food was great and the entertainment options were excellent too. My teenage boys found programs they wanted to watch while I had fun watching a full season of the Last Man - the Blind Investigator (Japanese), which my wife enjoyed too. My only complaint was that it takes a very long time to taxi at ICN (20 minutes) and the pilot had to hold at the gate for 10 minutes after our scheduled departure time, which meant we got to Seattle 27 minutes late. Luckily I had a long enough connection to make my next flight, but just barely.

Just a typical domestic poor flight nothing more. There is no food choices in such a flight. Crew doesn't really care if you are on-board or not

My second flight wasn't better than the first one. And this is 14 hours trip, crew came out only to offer food and the choices was poor. This food choices are good for Asian people but not for westerners. The breakfast kind thing was a corn sausage really disgusting. The air-conditioned blower really blow high and cold, turn out on my arrival to feel seek, that makes the trip uncomfortable. The crew didn't not really come out during the trip to offer drinks or snacks. No fruits available. Very poor service

Most relaxing long distance flight I have been on. And I have flown on many.

Not great, will likely try to fly another or maybe I should have upgraded my ticket? Needed Air…

I don’t think I’ll be flying them again. Tight seats, no flowing air or air nozzles that you can turn air on you, for those who could have motion sickness this would be your worst nightmare. The pilot was great and experienced (which is what you want when flying 12 hours) overall I’m thankful knowledgeable pilots!

My ticket did not indication which group I was in for boarding; the gate attended help me

Very routh cabin crew food is only 2 meals for 13 hours fry with them They should get better training how to service good super routh language and talking with customer

I would like to commend the staff from this flight. They all looked happy and I can tell they love what they are doing and constantly smiling while serving the passengers. Special mention to the guy FA in our section. I did not get his name but he is so far the best F.A I have ever encountered!

staff are super nice and effiecient! It was a very comfortable and relaxing flight

When I booked a premium economy ticket. I then had to pay $100+ to book my seat.

Boarding could have been a little bit better but other than that it was a pretty good experience. I think because of the stowaway to Paris France recently they are being extra diligent about boarding passes at the gate. But they boarded the back of the plane first, and that's something I really think needs to start in the USA.

Didn't like on this return inbound flights (from Hong Kong to Vancouver) Outbound to the Hong Kong was good.

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Delta flight was on time, seats were comfortable, and crew was nice.

Bathrooms dirty sinks clogged. No one seemed to clean them. Plane very old

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

It was terrible, if they ran flights on time it would make a big difference.

Delta seems to be improving in many areas, except they are super bad with the food available. Bring back normal food service on long flights.

I actually received a notification from kayak on email but not one by text from Delta when my departure gait changed and I almost missed my flight

New boarding doesn't make sense. Filling front first is slow.

Delta flight was great from the check in all the way to arrival. However, I had a very bad experience. I requested a wheelchair and the wheelchair employee that went to pick me up from the plane in Boston to bring me to the baggage claims told me I have to pay him. I was under the impression that it was a free service and I usually give tips but the person forced me to pay and since I said no because I was upset with his demand when my daughter walked in to pick me up he demanded payment from my daughter who paid him thinking maybe now it is a charged service.

The personnel were professional and friendly. The Boeing 737 Max 9 is too claustrophobic and was very warm at both airport gates, and still warm in the air.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

get E+, a must for 5 hours flight if you are tall

The first flight was better in terms of the aircraft.

Liked fold flat bed. Didn’t like having no window. Didn’t like poor choice of food and being served dinner very late, hours after take off of a 7:40pm flight. Servers not friendly. Food horrible in business class.

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

The gate was too far away for the connecting flight

Compared with other carriers business class for an overnight was not worth the extra expense.

Seats were comfortable. It’s was so cold and very uncomfortable. I paid 2000 miles for wifi service that was choppy the whole flight. Would like to be reimbursed for my miles Food was so disappointing. Three cold and terrible meals for $3000 round trip. This needs to be better.

Easy to board. Flight was super crowded though so I didn't sleep well on that cross country red-eye flight. The aisles seem ot have gotten narrower and the seat smaller whn luggage and people are getting bigger so it would be AWESOME to have more space and breathing room in general ;)

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

Information on your arrival and departure airports

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