The cheapest times to fly from ONT to BKK are

  • January 15th to April 29th (except the weeks of January 22nd and March 26th)
  • August 20th to December 2nd (except the weeks of October 8th and November 19th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from ONT to BKK is late September. Prices can be as high as $1544 for Saturday flights during mid December, or as low as $582 for Tuesday flights around late September.


When to Fly to Bangkok

Flying from Ontario, CA (ONT) to Bangkok (BKK) will usually cost between $586 to $1096 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late September with an average ticket price of $626. Due to high demand the most expensive time to fly is mid December, with an average price of $1275. Planning your trip to low-cost times can easily save you $649 on economy flights and even more on first-class flights. Generally, any price below $709 can be considered a good price for a round-trip ONT to BKK flight.

See below for a graph of average weekly prices for the ONT to BKK route. All prices are for round-trip tickets in USD.

ONT to BKK Flight Prices

Compared to other flights, the ONT to BKK flight is cheaper than the average and costs less than the average flight leaving from Ontario. The average price per mile (for a direct flight) is $0.05, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly to Bangkok, and Thursdays are the most expensive days to return to Ontario. Selecting flights on the least expensive days could save you up to $74 (8%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $741. Return trip prices are from the BKK to ONT flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from ONT to BKK can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 15 hour 54 minutes may not be realistic.


Flight Questions Answered

Still have questions about flying from ONT to BKK? We’ve got answers.

Which airlines fly this route?

You can find 27 major airlines flying this route most often: Air Canada, Air France, Alaska, Alitalia, American, ANA, Asiana, Bangkok Airways, British Airways, Cathay Pacific, China Airlines, China Southern, Delta, EgyptAir, EVA Air, Hainan, Iberia, JAL, KLM, Lufthansa, Qatar Airways, Shanghai Airlines, Singapore Airlines, Turkish Airlines, United, Vietnam Airlines, Virgin Atlantic, and potentially more during busy seasons.

How far away is it from Suvarnabhumi International Airport to Ontario International Airport?

The distance between the two airports is roughly 8284 miles or 13332 kilometers.

How long does it take to fly from ONT to BKK?

The real-world flight time for a nonstop ONT to BKK flight is about 15 hour 54 minutes.

How many flights go between Ontario, CA and Bangkok?

It depends on the day of the week and the date, but a typical day might have around 84 available flights from ONT to BKK.


Airport Location Info


Departing Airport

Origination code ONT
Origination airport name Ontario International Airport
City Ontario, CA
Country the United States
Latitude 34.1
Longitude -117.6

Return Airport

Destination code BKK
Destination airport name Suvarnabhumi International Airport
City Bangkok
Country Thailand
Latitude 13.7
Longitude 100.7


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.