$426 Find Cheap Flights from Ontario to Thailand

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 Thailand departing on 11/13. 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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Best Thailand Flight Deals from Ontario

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Bangkok
Bangkok2 stops$778
Phuket City
Phuket City2 stops$963
Chiang Mai
Chiang Mai2 stops$783
Bangkok
Bangkok2 stops$778
Phuket City
Phuket City2 stops$963
Chiang Mai
Chiang Mai2 stops$783

Cheap Flights from Ontario to Thailand (ONT-TH0)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Thailand 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 Thailand

Tue, Oct 21 - Thu, Oct 30
Delta Logo
6:00 am - 1:05 amONT-BKK
29h 05m2 stops
Delta Logo
9:40 am - 10:42 pmBKK-ONT
27h 02m2 stops
$778Delta
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Mon, Nov 3 - Mon, Nov 17
Korean Air Logo
6:45 am - 12:45 amONT-BKK
27h 00m2 stops
Korean Air Logo
9:40 am - 5:17 pmBKK-ONT
46h 37m2 stops
$783Korean Air
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Fri, Aug 8 - Sun, Aug 17
STARLUX Airlines Logo
11:45 pm - 4:40 pmONT-BKK
26h 55m1 stop
STARLUX Airlines Logo
5:50 pm - 5:40 pmBKK-ONT
37h 50m1 stop
$808STARLUX Airlines
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Wed, Aug 6 - Fri, Aug 15
STARLUX Airlines Logo
11:45 pm - 4:40 pmONT-BKK
26h 55m1 stop
STARLUX Airlines Logo
1:10 pm - 5:40 pmBKK-ONT
18h 30m1 stop
$819STARLUX Airlines
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Thu, Sep 4 - Thu, Sep 11
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
$825United Airlines
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Tue, Aug 19 - Tue, Aug 26
United Airlines Logo
5:10 am - 11:55 pmONT-BKK
28h 45m2 stops
United Airlines Logo
7:00 am - 5:37 pmBKK-ONT
24h 37m2 stops
$828United Airlines
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Mon, Sep 22 - Mon, Oct 6
 Logo
6:00 am - 9:45 pmONT-BKK
25h 45m2 stops
 Logo
9:50 am - 5:17 pmBKK-ONT
21h 27m2 stops
Sun, Oct 5 - Sun, Oct 19
China Airlines Logo
12:10 am - 4:20 pmONT-BKK
26h 10m1 stop
China Airlines Logo
2:40 am - 6:00 pmBKK-ONT
29h 20m1 stop
$846China Airlines
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Mon, Oct 13 - Mon, Oct 27
China Airlines Logo
12:10 am - 9:45 amONT-BKK
19h 35m1 stop
China Airlines Logo
2:05 pm - 5:50 pmBKK-ONT
17h 45m1 stop
$849China Airlines
Find Deal
Tue, Oct 14 - Mon, Oct 27
 Logo
6:00 am - 9:45 pmONT-BKK
25h 45m2 stops
 Logo
1:00 am - 5:17 pmBKK-ONT
30h 17m2 stops
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KAYAK's insights & trends for Ontario to Thailand flights

Get data-powered insights and trends into flights from Ontario to Thailand 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 Thailand?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Thailand, 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 Thailand is September, when tickets cost $868 (return) on average. On the other hand, the most expensive months are July and June, when the average cost of round-trip tickets is $1,491 and $1,459 respectively.

What’s the cheapest day of the week to fly from Ontario to Thailand?

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

Your flight ticket price will generally be cheaper if you fly to Thailand on a Wednesday and more expensive on a Friday. On your return trip to Ontario, you should consider flying back on a Thursday, and avoid Fridays for better deals.

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

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 Thailand, 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 Thailand, 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

Low seasonAugust
High seasonNovember
Cheapest flight$426
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Ontario to Bangkok Suvarnabhumi Airport

FAQs - booking Thailand flights

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

    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 Thailand.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Thailand 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 Thailand?

    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 from Ontario to Thailand with an airline and back with another airline.

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

    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 from Ontario to Thailand up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Thailand?

    The cheapest time of day to fly to Thailand is generally in the morning, when round-trip flights cost $911 on average. Morning departures are around 29% cheaper than evening flights, on average. The most expensive time of day to fly to Thailand is generally in the evening, which is peak travel time and where the average cost of a ticket is $1,279.

Top 5 airlines serving from Ontario to Thailand

Need help choosing which airline to fly with from Ontario to Thailand? 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.
9.1
STARLUX AirlinesOverall score based on 171 reviews
9.0Entertainment
9.3Crew
8.9Food
9.0Boarding
9.0Comfort
Airline reviews

Serve me a meal, I fell asleep during the flight. So they passed me twice.

2.0 MediocreAnonymous, May 2025SEA - TPE
Read more STARLUX Airlines reviews

Serve me a meal, I fell asleep during the flight. So they passed me twice.

Seats are not table comfortable. Crew members are pretty good. Can be much better!!

Very pleasant overall, although the movie selection could have been better.

Very pleasant experience overall, while the main course of the meal could have been better and the movies could have been more recent and with more variety.

I usually have ear problems when planes land. But the landing was so smooth I didn’t even notice it landing! The service was excellent!

the aircraft was fine and new. The crews can have better training. Their operations are not as smooth as EVA's. They are VERY stingy with drinking water. Throughout the entire flight, no one offered me any water and snacks. I still prefer EVA after trying out Starlux initially with lots of excitement and expectations.

Everything was smooth and professional. They could improve the raw vegan meal with fresher offerings, but otherwise they are now my favorite way to fly to Asia.

Leg space is small. Need more room for long flight.

Leg space is too small. Need to increase space for long flight.

Amazing!!! It really is good! The seats do go back far to relax so if you don’t like the person to go back, just adjust and go back and everyone goes back to settle and be comfy. Enjoy few free drinks and the little amenities they provide.

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

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.

Best service I’ve ever had Flight attendants are nicely dressed and look very professional

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

Food choice could be better, plus the crew can walk around and offer snacks and drinks. Also the air-conditioning onboard blows high speed, and very cold makes the trip uncomfortable.

China Airlines crews are very excellent doing their job. Very friendly and hardworking. I will always choose China Airlines over and over. Thank you all for making my flight comfortable. God bless to all the staff. :)

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!

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!

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.

I was ordered vegetarian food, but didn't services to me :(

I did not take the flight, tried to cancel it right after I booked it, but was unable to reach anyone. I blame Kayak for this situation because they sent the booking through another company and I was unable to get anyone to talk to me about the situation. I had to just take the hit and pay for another flight through Cathay Pacific, which was wonderful. I will never use Kayak again. (I bet they don’t post this review!) I’ll just post about them on social media sites. I don’t want anyone to have to go through the hassle and expense I dealt with.

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.

Boarding seemed to be organized bedlam. For what ever reason, preboarding took longer than 20 minutes. Made the plane 20 minutes late taking off. Luckily we arrived on time. Flight crew seemed very friendly. Only slight turbulence.

They hired a new catering company the same day of my flight. They botched the job by not delivering the right carts and after THREE HOURS waiting, the flight crew timed out (flight was 19 hours long and FAA rules state crew can’t work more than 14 hours long). So they CANCELED OUR FLIGHT!! Worst experience ever. Avoid UAL at all costs.

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.

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

Information on your arrival and departure airports

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