The cheapest times to fly from ONT to CNX are

  • January 8th to May 13th (except the weeks of January 22nd and March 26th)
  • September 3rd to September 23rd (except the week of September 10th)
  • October 15th to December 9th

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 CNX is early to mid May. Prices can be as high as $3747 for Saturday flights during mid December, or as low as $848 for Tuesday flights around early to mid May.


When to Fly to Chiang Mai

Flying from Ontario, CA (ONT) to Chiang Mai (CNX) will usually cost between $953 to $1363 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid May with an average ticket price of $917. Due to high demand the most expensive time to fly is mid December, with an average price of $1489. Planning your trip to low-cost times can easily save you $572 on economy flights and even more on first-class flights. Generally, any price below $1058 can be considered a good price for a round-trip ONT to CNX flight.

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

ONT to CNX Flight Prices

Compared to other flights, the ONT to CNX flight is priced close to the average and costs less than the average flight leaving from Ontario. The average price per mile (for a direct flight) is $0.08, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to CNX, and Monday the cheapest day to fly back into ONT. Saturdays are the most expensive days to fly to Chiang Mai, and Sundays are the most expensive days to return to Ontario. Selecting flights on the least expensive days could save you up to $578 (22%) 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 $1061. Return trip prices are from the CNX 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 CNX 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 30 minutes may not be realistic.


Flight Hacking ONT to CNX

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from ONT to CNX — but Champion Traveler does!

Hack #1: Bangkok (ONT > BKK > CNX)

  • Price for both tickets: $777
  • Average savings: $281 (26.56%)

See ONT to BKK flights

Hack #2: Hanoi (ONT > HAN > CNX)

  • Price for both tickets: $874
  • Average savings: $185 (17.44%)

See ONT to HAN flights

Hack #3: Hong Kong (ONT > HKG > CNX)

  • Price for both tickets: $899
  • Average savings: $160 (15.08%)

See ONT to HKG flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 24 major airlines flying this route most often: Aer Lingus, Air Canada, Air France, American, Bangkok Airways, British Airways, Cathay Dragon, Cathay Pacific, China Airlines, China Southern, Delta, EVA Air, Finnair, Iberia, JAL, KLM, Lufthansa, Qatar Airways, Singapore Airlines, Tap Air Portugal, Turkish Airlines, United, Virgin Atlantic, WestJet, and potentially more during busy seasons.

How far away is it from Chiang Mai International Airport to Ontario International Airport?

The distance between the two airports is roughly 8064 miles or 12978 kilometers.

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

The real-world flight time for a nonstop ONT to CNX flight is about 15 hour 30 minutes.

How many flights go between Ontario, CA and Chiang Mai?

It depends on the day of the week and the date, but a typical day might have around 12 available flights from ONT to CNX.


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 CNX
Destination airport name Chiang Mai International Airport
City Chiang Mai
Country Thailand
Latitude 18.8
Longitude 99


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.