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764 € Cheap Flights from Chiang Mai to Ontario International

Compare Chiang Mai to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

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Flight deals from Chiang Mai to Ontario International

Looking for a cheap last-minute deal or the best return flight from Chiang Mai Airport to Ontario International Airport? If you want to travel next month, return fares start from 974 €. Find the lowest prices on one-way and return tickets right here.
Ontario.764 € per passenger.Departing Fri, 20 Nov, returning Sat, 5 Dec.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Fri, 20 Nov, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Sat, 5 Dec, arriving in Chiang Mai.Price includes taxes and charges.From 764 €, select.
Ontario.806 € per passenger.Departing Sun, 13 Sep, returning Sun, 20 Sep.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Sun, 13 Sep, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Sun, 20 Sep, arriving in Chiang Mai.Price includes taxes and charges.From 806 €, select.
Ontario.809 € per passenger.Departing Fri, 9 Oct, returning Sat, 24 Oct.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Fri, 9 Oct, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Sat, 24 Oct, arriving in Chiang Mai.Price includes taxes and charges.From 809 €, select.
Ontario.810 € per passenger.Departing Wed, 30 Sep, returning Wed, 28 Oct.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Wed, 30 Sep, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Wed, 28 Oct, arriving in Chiang Mai.Price includes taxes and charges.From 810 €, select.
Ontario.811 € per passenger.Departing Tue, 6 Oct, returning Sun, 1 Nov.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Tue, 6 Oct, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Sun, 1 Nov, arriving in Chiang Mai.Price includes taxes and charges.From 811 €, select.
Ontario.816 € per passenger.Departing Wed, 11 Nov, returning Fri, 19 Feb.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Wed, 11 Nov, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Fri, 19 Feb, arriving in Chiang Mai.Price includes taxes and charges.From 816 €, select.
Ontario.816 € per passenger.Departing Wed, 11 Nov, returning Wed, 11 Nov.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Wed, 11 Nov, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Wed, 11 Nov, arriving in Chiang Mai.Price includes taxes and charges.From 816 €, select.
Ontario.819 € per passenger.Departing Mon, 5 Oct, returning Sat, 5 Dec.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Mon, 5 Oct, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Sat, 5 Dec, arriving in Chiang Mai.Price includes taxes and charges.From 819 €, select.
Ontario.890 € per passenger.Departing Wed, 30 Sep, returning Wed, 18 Nov.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Wed, 30 Sep, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Wed, 18 Nov, arriving in Chiang Mai.Price includes taxes and charges.From 890 €, select.
Ontario.960 € per passenger.Departing Tue, 1 Dec, returning Mon, 7 Dec.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Tue, 1 Dec, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Mon, 7 Dec, arriving in Chiang Mai.Price includes taxes and charges.From 960 €, select.
Ontario.974 € per passenger.Departing Tue, 18 Aug, returning Mon, 24 Aug.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Tue, 18 Aug, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Mon, 24 Aug, arriving in Chiang Mai.Price includes taxes and charges.From 974 €, select.
Ontario.987 € per passenger.Departing Mon, 29 Mar, returning Fri, 30 Apr.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Mon, 29 Mar, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Fri, 30 Apr, arriving in Chiang Mai.Price includes taxes and charges.From 987 €, select.
Ontario.1.016 € per passenger.Departing Mon, 31 Aug, returning Mon, 7 Sep.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Mon, 31 Aug, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Mon, 7 Sep, arriving in Chiang Mai.Price includes taxes and charges.From 1.016 €, select.
Ontario.1.065 € per passenger.Departing Tue, 15 Jun, returning Thu, 24 Jun.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Tue, 15 Jun, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Thu, 24 Jun, arriving in Chiang Mai.Price includes taxes and charges.From 1.065 €, select.
Ontario.1.067 € per passenger.Departing Mon, 29 Mar, returning Tue, 15 Jun.Return flight with China Airlines.Outbound indirect flight with China Airlines, departs from Chiang Mai on Mon, 29 Mar, arriving in Ontario International.Inbound indirect flight with China Airlines, departs from Ontario International on Tue, 15 Jun, arriving in Chiang Mai.Price includes taxes and charges.From 1.067 €, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Chiang Mai to Ontario International flights are currently cheapest in September.
Jul
Find prices
Aug
from 974 €
Sep
from 806 €
Oct
from 809 €
Nov
from 816 €
Dec
from 960 €
Jan
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Feb
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Mar
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Apr
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May
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Jun
from 1.065 €

Chiang Mai to Ontario International: Alternative routes

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

Ontario International

4km from central Ontario
Closest
from 764 €
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San Bernardino Norton AFB

39km from central Ontario
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Santa Ana John Wayne

48km from central Ontario
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Long Beach Municipal

54km from central Ontario
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Hawthorne

65km from central Ontario
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Burbank

67km from central Ontario
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Los Angeles International

71km from central Ontario
Cheapest
from 680 €
Search flights

Chiang Mai to Ontario: Flight information

The things to know before you go.
Cheapest flight found764 €
Cheapest month to flyNovember

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

The best price we found for a return flight from Chiang Mai to Ontario International is 764 €. 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 Chiang Mai to Ontario International. But we found flights with one or more stops from 764 €.
As of July 2026, there are no flights flying from Chiang Mai to Ontario International.
The cheapest month to fly from Chiang Mai to Ontario International is usually November.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Chiang Mai Airport to Ontario International Airport on Friday, 20 November 2026.
No airlines currently offer direct flights between Chiang Mai Airport and Ontario International 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 Ontario International 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 Ontario is around 40 days in advance, so don’t leave your flight to the last minute.

Currently, China Airlines offers the cheapest flight tickets to Ontario International.

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

  • Ontario is 15 hours behind Chiang Mai and follows the UTC-8 timezone.

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

  • You can expect longer lines during popular months like January. Arriving up to four hours ahead of an international flight and two hours for domestic departures will help ensure a smooth travel experience.

  • Pick a stopover if you'd like to break up your flight. Just deselect 'Direct flights only' to look at all your options for tickets from Chiang Mai Airport to Ontario International Airport. Taipei Taiwan Taoyuan Airport is a popular stopover on the CNX to ONT route.

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

  • The lowest price we've found for a one-way Chiang Mai Airport to Ontario International Airport flight is 421 €. A return ticket right now is 764 €. Depending on the availability and when you book, these fares may change.

  • It's usually smart to book ahead of time if you want to get cheap tickets from CNX to ONT. That's because airlines change prices based on demand, which tends to increase closer to departure.

  • Finding cheap flights from Chiang Mai Airport to Ontario International Airport is easy if you can be flexible with your travel plans. Use the 'Whole month' search tool to see the lowest fares across the month and snap up a great deal.

  • Picking up cheap flights from CNX to ONT is a cinch with Price Alerts. All you need to do is create one of these automatic alerts and we'll let you know as soon as fares go down.

  • Pick your ideal arrival and departure times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to find the best deals on flights from Chiang Mai Airport to Ontario International Airport.

Handy information about Chiang Mai Airport (CNX)

  • 73% of flights taking off from Chiang Mai Airport arrive at their destination on time.

  • Chiang Mai Airport is about 3 kilometres from central Chiang Mai. If you're driving, ride-sharing or catching a taxi from the centre, it'll take 15 minutes or so to get there, depending on the traffic.

  • You can expect a journey time of roughly 25 minutes on public transport.

  • Looking for a handy hotel close to CNX? If you're boarding an early flight from Chiang Mai Airport to Ontario International Airport, these accommodation options will have you sleeping moments from your departure gate:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • You'll find ONT at 2900 E. Airport Drive.

  • Ontario International Airport to central Ontario has a drive time of around 15 minutes. It's approximately 10 kilometres away.

  • When travelling by public transport, expect a journey time of around 45 minutes.

When to fly to Ontario International Airport (ONT)

  • July is the most popular month for flights from Chiang Mai Airport to Ontario International Airport. To steer clear of the crowds, visit Ontario in March.

  • Lock in your flight from Chiang Mai Airport to Ontario International Airport for August if you'd like to explore Ontario during its warmest month. Expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

  • Search for cheap tickets from CNX to ONT in February if you like cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC (39ºF) and 24ºC (75ºF) on average.

Explore more of the United States

  • Los Angeles is just one of the many cities in the United States waiting to be explored once you've seen Ontario. Around 56 kilometres away to the west, its best attractions include Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

  • Around 153 kilometres south of Ontario, San Diego is another essential stop in the United States. Experience major highlights starting with San Diego Zoo, San Diego Balboa Park and USS Midway Museum.

Plan the rest of your trip from Chiang Mai to Ontario

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.