฿11,640+ Cheap flights from Ontario
This is the cheapest return flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/2. 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.
ONT — BKK
8 Nov — 15 Nov1
Find flights from Ontario within your budget
Find flights departing from Ontario that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 9 October 2026. In the last 7 days, Cheapflights users made a total of 7,457,451 searches
Fly to
Route
Depart
Return
Cheapest return flight
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Tue 12/1
15:30-21:30
2 stops63h 00m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿12,313
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Fri 15/1
15:30-00:20
2 stops41h 50m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿14,533
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Thu 22/10
06:07-09:35
2 stops37h 28m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿15,173
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Fri 30/10
06:00-23:05
2 stops27h 05m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿15,442
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Wed 21/10
11:10-23:55
2 stops46h 45m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿16,249
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Mon 1/2
07:25-05:10
2 stops30h 45m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿16,518
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Wed 24/2
11:20-05:10
2 stops50h 50m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿16,518
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Tue 2/2
07:25-05:10
2 stops30h 45m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿16,518
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Thu 4/2
07:25-05:10
2 stops30h 45m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿16,518
Fastest return journey
OntarioBangkok
ONT Ontario - BKK Bangkok Suvarnabhumi
ONTBKK
Ontario
Wed 17/2
08:00-00:20
2 stops25h 20m
Bangkok Suvarnabhumi
Wed 31/12
00:00-09:00
Nonstop0h 00m
฿16,619
Showing 1-10 of 23 resultsSorted by cheapest first
Best time to book a flight from Ontario
Have a flexible travel schedule? Discover the best time to fly from Ontario with our price prediction graph.
ONT-BKK
ONT-MNL
ONT-SIN
ONT-MAN
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Travel insights for flights from Ontario
Get recent, data-driven insights about flights from Ontario including ideal travel times, pricing trends, and more.
ONT-BKK
ONT-MNL
ONT-SIN
ONT-MAN
What is the cheapest month to book a flight from Ontario?
Currently, January is the cheapest month in which you can book a flight from Ontario (average of ฿26,005). Flying from Ontario in June will prove the most costly (average of ฿49,016). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.
What are popular destinations to fly to from Ontario?
If you’re flying from Ontario, these routes are more frequently taken by airlines Dallas (145 flights per day), Seattle (113 flights per day) and Atlanta (89 flights per day).
What is the cheapest place to fly to from Ontario?
The cheapest city to fly to from Ontario is Seattle/Tacoma Intl, with prices starting at ฿6,957. Explore other affordable destinations below.
When is the best time to book a flight from Ontario?
Booking 14 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Browse thousands of different options on Cheapflights for your next trip
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Direct flights from California
Nearby airports
Other United States cities
Popular flights
Direct flights from California
Book a direct flight from one of these other cities located in California.
Airports servicing Ontario
Fly out of one of these airports located in Ontario.
Fly from other United States cities
Consider departing from one of these cities also located in United States. Flight origins are based on user searches made on Cheapflights and were last updated on 9 October 2026.
Popular flight searches
Check out other popular destinations found by fellow travellers in 2026
Related info for your journey
Access useful and relevant information related to your journey from Ontario. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 9 October 2026.
Fly with Cheapflights
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Ontario?
Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.
Why should you use Cheapflights to find cheap flight tickets from Ontario?
Cheapflights simply makes it quick and affordable to book flights from Ontario by bringing together all flight options from hundreds of airlines and agencies online — and we put them in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.
Can Cheapflights find flights from Ontario with no change fees?
Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario, users can toggle the no change fees filter when performing a flight search.
Can Cheapflights notify me if prices for flights from Ontario become cheaper?
Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and use a valid email address to enable the Price Alerts feature. That’s it!