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Cheap Flights from Ontario International (ONT) to Chiang Mai (CNX)

Compare Ontario International to Chiang Mai flight deals

Find the cheapest month or even day of the year to fly to Chiang Mai

Book the best Chiang Mai fare with no extra fees

Flight deals from Ontario International to Chiang Mai

Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Chiang Mai Airport? If you want to travel next month, return fares start from £1,120. Find the lowest prices on one-way and return tickets right here.
Chiang Mai.£417 per passenger.Departing Tue, 2 Feb.One-way flight with Korean Air.Outbound indirect flight with Korean Air, departs from Ontario International on Tue, 2 Feb, arriving in Chiang Mai.Price includes taxes and charges.From £417, select.
Chiang Mai.£419 per passenger.Departing Tue, 1 Dec.One-way flight with Korean Air.Outbound indirect flight with Korean Air, departs from Ontario International on Tue, 1 Dec, arriving in Chiang Mai.Price includes taxes and charges.From £419, select.
Chiang Mai.£423 per passenger.Departing Tue, 19 Jan.One-way flight with Korean Air.Outbound indirect flight with Korean Air, departs from Ontario International on Tue, 19 Jan, arriving in Chiang Mai.Price includes taxes and charges.From £423, select.
Chiang Mai.£424 per passenger.Departing Thu, 18 Mar.One-way flight with Korean Air.Outbound indirect flight with Korean Air, departs from Ontario International on Thu, 18 Mar, arriving in Chiang Mai.Price includes taxes and charges.From £424, select.
Chiang Mai.£424 per passenger.Departing Wed, 18 Nov.One-way flight with Korean Air.Outbound indirect flight with Korean Air, departs from Ontario International on Wed, 18 Nov, arriving in Chiang Mai.Price includes taxes and charges.From £424, select.
Chiang Mai.£433 per passenger.Departing Sun, 25 Oct.One-way flight with Korean Air.Outbound indirect flight with Korean Air, departs from Ontario International on Sun, 25 Oct, arriving in Chiang Mai.Price includes taxes and charges.From £433, select.
Chiang Mai.£462 per passenger.Departing Fri, 28 Aug.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Fri, 28 Aug, arriving in Chiang Mai.Price includes taxes and charges.From £462, select.
Chiang Mai.£462 per passenger.Departing Sun, 27 Sep.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Sun, 27 Sep, arriving in Chiang Mai.Price includes taxes and charges.From £462, select.
Chiang Mai.£481 per passenger.Departing Tue, 13 Apr.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Tue, 13 Apr, arriving in Chiang Mai.Price includes taxes and charges.From £481, select.
Chiang Mai.£537 per passenger.Departing Thu, 16 Jul.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Thu, 16 Jul, arriving in Chiang Mai.Price includes taxes and charges.From £537, select.
Chiang Mai.£750 per passenger.Departing Sun, 21 Jun.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Sun, 21 Jun, arriving in Chiang Mai.Price includes taxes and charges.From £750, select.
Chiang Mai.£816 per passenger.Departing Tue, 26 May.One-way flight with China Airlines.Outbound indirect flight with China Airlines, departs from Ontario International on Tue, 26 May, arriving in Chiang Mai.Price includes taxes and charges.From £816, select.

Find the cheapest month to fly from Ontario International to Chiang Mai

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Chiang Mai flights are currently cheapest in February.
May
from £816
Jun
from £750
Jul
from £537
Aug
from £462
Sep
from £462
Oct
from £433
Nov
from £424
Dec
from £419
Jan
from £423
Feb
from £417
Mar
from £424
Apr
from £481

Ontario International to Chiang Mai: Alternative routes

Compare routes from Ontario International to Chiang Mai below. You may find an airport to fly into that's cheaper, faster, or easier than Chiang Mai.

Chiang Mai

2 miles from central Chiang Mai
ClosestCheapest
from £417
Search flights

Lampang

49 miles from central Chiang Mai
from £685
Search flights

Ontario to Chiang Mai: Flight information

The things to know before you go.
Cheapest flight found£417
Cheapest month to flyFebruary

Finding cheap flights from Ontario International to Chiang Mai: Frequently asked questions

The best price we found for a return flight from Ontario International to Chiang Mai is £687. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ontario International to Chiang Mai. But we found flights with one or more stops from £687.
As of May 2026, there are no flights flying from Ontario International to Chiang Mai.
The cheapest month to fly from Ontario International to Chiang Mai is usually November.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Chiang Mai Airport on Monday, 2 November 2026.
No airlines currently offer direct flights between Ontario International Airport and Chiang Mai Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Chiang Mai but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Chiang Mai is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Korean Air offers the cheapest flight tickets to Chiang Mai.

Flying from Ontario International Airport (ONT) to Chiang Mai International Airport (CNX): what you need to know

  • Chiang Mai's timezone is UTC+7, making Chiang Mai 14 hours ahead of Ontario.

  • Arrive at the airport on time so you don't miss your ONT to CNX flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid any last-minute rush.

  • Travelling during a peak time such as August? Major public holidays and other high seasons can lead to longer lines and delays at airport checkpoints. Play things extra safe and arrive up to four hours before an international flight and two hours before a domestic departure.

  • Pick a stopover if you want to break up your flight. Simply uncheck 'Direct flights only' to see your options for tickets from Ontario International Airport to Chiang Mai International Airport. Taiwan Taoyuan International Airport is a popular stopover on the ONT to CNX route.

How to find the cheapest flights from Ontario International Airport (ONT) to Chiang Mai International Airport (CNX)

  • At the moment, £417 is the cheapest price we've found for a one-way Ontario International Airport to Chiang Mai International Airport flight. The best price for a return ticket is £687. Bear in mind that fares can change due to demand at the time of booking.

  • To pick up cheap tickets from ONT to CNX, book as early as you can. Airlines generally offer the most competitive fares when flights are first released.

  • Getting cheap flights from Ontario International Airport to Chiang Mai International Airport is easy if you're flexible with your trip dates. Use the 'Whole month' function to see the lowest fares across each month and land a great deal.

  • Save time looking for cheap flights from ONT to CNX by creating a Price Alert. You'll get an email or notification on the app when a new low fare is offered.

  • Tailor your flights with filters. Pick your preferred arrival and departure times, airlines and total journey duration. You can also sort your results by 'Cheapest,' 'Fastest' or 'Best' flights from Ontario International Airport to Chiang Mai International Airport.

Handy information about Ontario International Airport (ONT)

  • ONT is located at 2900 E. Airport Drive.

  • Ontario International Airport scores top marks for its on-time performance. 83.6% of flights that take off from ONT arrive at their destination without delay.

  • Central Ontario to Ontario International Airport is around 4 miles. Depending on traffic, it'll take about 10 minutes to get there if you're driving, catching a cab or ride-sharing.

  • Catching public transport? You can expect a journey time of around 1 hour 30 minutes.

  • Get your travels off to a leisurely start by staying near ONT. Whether you're catching an early flight from Ontario International Airport to Chiang Mai International Airport or just don't want to be rushed, these stays are the answer:

Arriving at Chiang Mai International Airport (CNX)

Getting from Chiang Mai International Airport (CNX) to central Chiang Mai

  • From Chiang Mai International Airport, Chiang Mai is approximately 3 miles away. It takes around 10 minutes to get to the centre driving.

  • Getting to the centre by public transport will take you around 25 minutes.

When to fly to Chiang Mai International Airport (CNX)

  • August is the most popular month for flights from Ontario International Airport to Chiang Mai International Airport. To avoid the crowds, head to Chiang Mai in February.

  • Before locking in your flight from Ontario International Airport to Chiang Mai International Airport, consider the type of weather you enjoy. April is the warmest month in Chiang Mai, with the temperature ranging from 22ºC (72ºF) to 42ºC (108ºF).

  • Look for cheap tickets from ONT to CNX in January if you like cooler conditions. Temperatures are at their lowest then, ranging between 12ºC (54ºF) and 31ºC (88ºF) on average.

Explore more of Thailand

  • You've done Chiang Mai, now it's time to explore other parts of Thailand. Journey around 270 miles east to Udon Thani to tick off its leading attractions. From Nong Prajak Public Park to Krom Luang Prachaksinlapakhom Monument and Chinesisches Tor, you've got a jam-packed schedule ahead.

  • If you're ready to explore another great destination in Thailand, consider Lampang, about 50 miles south-east of Chiang Mai. Baan Sao Nak, Ratsadapisek Bridge and Horse-Drawn Carriage are key highlights.

Plan the rest of your trip from Ontario to Chiang Mai

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.