ONT - BKK

$410 Find Cheap Flights from Ontario to Bangkok - Compare and Save

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 8/18. 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

Save 20% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$778
Typical prices: $768-$992
Korean Air
Wed 9/2Tue 9/8
ONT - BKK • 2 stops
Cheapest one-way
$410
Typical prices: $448-$458
Korean Air
Tue 8/18
ONT - BKK • 2 stops
Top airlines
Cheapest • from $778 (round-trip)
Best reviews • 8.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Bangkok. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $697 (round-trip)
Shortest trip • 19h 35m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 22% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Bangkok!
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

Wed, Sep 2 - Tue, Sep 8
Korean Air Logo
6:20 am - 9:45 pm
ONT
-
BKK
25h 25m
2 stops
Korean Air Logo
2:35 am - 5:19 pm
BKK
-
ONT
28h 44m
2 stops
$778Korean Air
Sun, Aug 30 - Sun, Sep 6
Korean Air Logo
6:20 am - 11:35 pm
ONT
-
BKK
27h 15m
2 stops
Korean Air Logo
9:40 pm - 5:21 pm
BKK
-
ONT
33h 41m
2 stops
$797Korean Air
Mon, Aug 10 - Tue, Aug 25
Korean Air Logo
6:20 am - 9:45 pm
ONT
-
BKK
25h 25m
2 stops
Korean Air Logo
11:30 pm - 5:21 pm
BKK
-
ONT
31h 51m
2 stops
$810Korean Air
Mon, Aug 24 - Wed, Sep 16
Delta Logo
6:20 am - 9:45 pm
ONT
-
BKK
25h 25m
2 stops
Delta Logo
2:35 am - 11:47 pm
BKK
-
ONT
35h 12m
2 stops
$820Delta
Wed, Sep 23 - Wed, Oct 21
Delta Logo
6:20 am - 9:45 pm
ONT
-
BKK
25h 25m
2 stops
Delta Logo
2:35 am - 10:43 pm
BKK
-
ONT
34h 08m
2 stops
$821Delta
Mon, Nov 23 - Wed, Feb 24
Korean Air Logo
7:00 am - 9:30 pm
ONT
-
BKK
23h 30m
2 stops
Korean Air Logo
11:15 pm - 10:43 pm
BKK
-
ONT
38h 28m
2 stops
$825Korean Air
Mon, Nov 16 - Tue, Dec 1
Korean Air Logo
7:00 am - 9:30 pm
ONT
-
BKK
23h 30m
2 stops
Korean Air Logo
9:30 pm - 5:17 pm
BKK
-
ONT
34h 47m
2 stops
$826Korean Air
Thu, Dec 31 - Mon, Feb 1
Korean Air Logo
7:00 am - 9:30 pm
ONT
-
BKK
23h 30m
2 stops
Korean Air Logo
12:55 am - 1:57 pm
BKK
-
ONT
28h 02m
2 stops
$844Korean Air
Fri, Aug 28 - Wed, Sep 16
Delta Logo
6:00 am - 9:45 pm
ONT
-
BKK
25h 45m
2 stops
Delta Logo
9:50 am - 11:47 pm
BKK
-
ONT
27h 57m
2 stops
$864Delta
Tue, Sep 29 - Thu, Oct 1
Delta Logo
6:20 am - 9:45 pm
ONT
-
BKK
25h 25m
2 stops
Delta Logo
11:30 pm - 5:20 pm
BKK
-
ONT
31h 50m
2 stops
$865Delta
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.

How much is a round-trip flight from Ontario to Bangkok Suvarnabhumi Airport?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Bangkok Suvarnabhumi Airport departing in September.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Bangkok Suvarnabhumi Airport, 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 Suvarnabhumi Airport 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 $1,528 and $1,409 respectively.

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

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 Suvarnabhumi Airport, 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 Suvarnabhumi Airport, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low season

September

Cheapest flight

$410
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Ontario to Bangkok

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 Ontario to Bangkok flights

  • What is the cheapest flight from Ontario to Bangkok Suvarnabhumi Airport?

    In the last 5 days, the lowest price for a flight from Ontario to Bangkok Suvarnabhumi Airport was $410 for a one-way ticket and $778 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?

    Ontario airport is called Ontario and the only airport in Bangkok is Bangkok Suvarnabhumi.

  • 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.

  • Which is the best airline for flights from Ontario to Bangkok, STARLUX Airlines or Korean Air?

    The two airlines most popular with KAYAK users for flights from Ontario to Bangkok are STARLUX Airlines and Korean Air. With an average price for the route of $831 and an overall rating of 8.8, STARLUX Airlines is the most popular choice. Korean Air is also a great choice for the route, with an average price of $826 and an overall rating of 8.4.

  • 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. Booking your flights between Ontario and BKK can sometimes prove cheaper using this method.

  • 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.
8.8
STARLUX AirlinesOverall score based on 360 reviews
8.6Food
9.1Crew
8.9Boarding
8.9Comfort
8.7Entertainment
Airline reviews

The seats weren’t comfortable and the foot rest was broken.

6.0 GoodKim, Jul 2026
TPE - BKK
Read more STARLUX Airlines reviews

The seats weren’t comfortable and the foot rest was broken.

Hostesses were very nice I am disappointed that I paid extra 900$for premium economy which wasn't much upgraded from regular economy, I have wasted my money on this trip 😫

amazing and great food. everything was smooth from start to finished

love this boutique luxury airline. crew was nice and attentive. Lounge is too small , i think they should have more area for relaxing and lounging not just to sit and eat .. feels like a cafeteria more than a lounge. overall i enjoy it. food on the plane LAX to Teipei should inprove a bit. no flavor and more drinks pls

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

Flight cancelled due to inclement weather yet rival airline EVA Air with the same route departed 2 hours later and landed safely while our flight was cancelled and rescheduled for 36 hours later.

The crew could have been kinder and less pushy. The premium economy seats don't have enough cushion. The seats are to hard and the flight became painful and uncomfortable after an hour of flying.

Our transit in Taipei was disappointing. The ground crew could not tell us where the lounge was located, so we wasted 15 minutes trying to find it. The airline has a great review, but our experience says otherwise.

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.

AAAAHHHH... It was shocking in a very positive way, the attention to detail, the courtesy, the manners of all personnel on board, the constant honest smiling. You can see and feel they take pride in all they do no matter how trivial. The plane in general was very comfortable. I can't wait to do it again

Lousy entertainment system. Crews are excellent. Meal is just mediocre.

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

long flights are difficult but the crew and amenities made it a very good experience

Good. Obviously there is a slightly condescending attitude of all American workers towards their customers but other than that all good.

It was a great experience in all aspects including passengers are respectful to each other. I will consider to fly with Korean Air again in the future.

Excellent service, love the extra amenities (water bottles, blankets, etc.).

They had the same movie choice as my previous flight, not much of a choice, movies were not up to date, music was uninteresting. Other than sitting on the ground for 40 minutes after boarding the plane, with pilot telling us that they couldn't load the plane because of rain, (bullshit) We finally got into Bangkok of course 40 minutes late.

After the gauntlet of unnecessary security, and the two mile jog to make the flight, the flight was delayed 20 minutes on the ground for takeoff.. However, once in the air, the crew gave its usual excellent service.

They destroyed my Michael Kors Carryon luggage, they didn’t announce that only check in the carry on and when we get inside a couple of room to put the carry on bag. I was disappointed and sad because of the damaged of my luggage. They should replace it or fixed it.

We were not sat together for the longeset duration of our travel very uncomfortable didnt enjoy that they fed us at 2 am

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

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

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

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.

Unable to set seat assignment. Got a call from presumably “China airlines representative” but was asking for an exorbitant amount for the seat assignment. Was traveling as a family end up being assigned to different seats as a result. Will never use underpricer again.

Not many selections for entertainment. Bulk head seats are no longer available with out fee at the counter. That’s pretty lame.

I would have liked to know how to order a special meal (for medical purposes) before the flight.

For a long-haul flight, the crew did a very good job of keeping the lavatories clean and the aisles clear.

Lovely service and excellent food and entertainment! I couldn’t have been more happy flying with air China

Crew was absolutely fantastic and we’re so welcoming and friendly ❤️

It was as good as it could be. Flying is not a pleasant experience these days.

Very good flight. Crew was great. No issues and we even arrived early.

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Flight delayed four separate times. I’m now one hour hours late to landing.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

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.

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

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

Information on your arrival and departure airports