What is the cheapest airline that flies from Ontario to Chiang Mai?

Delta and Korean Air are the most popular carriers operating from Ontario to Chiang Mai

What airlines fly to Chiang Mai?

Cathay Pacific, EVA Air and China Airlines are the top three most popular airlines that fly to Chiang Mai from Ontario according to our data. Cathay Pacific is the first choice among our users, with 34% of people opting to fly with this airline when traveling to Chiang Mai. Keep in mind that there are 7 different airlines that fly to Chiang Mai on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Ontario Airport to Chiang Mai Airport?

Prices for flights from Ontario Airport to Chiang Mai Airport were last updated today.

How many operators does momondo search for flights from Ontario Airport to Chiang Mai Airport?

As of September 2026, there is 1 operator available to choose from for flights from Ontario Airport to Chiang Mai Airport.

How old do you have to be to fly from Ontario Airport to Chiang Mai Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Chiang Mai Airport.

What documentation or ID do you need to fly to Chiang Mai Airport?

The travel and health documents required for your trip to Chiang Mai Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chiang Mai Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$415 Cheap Flights from Ontario to Chiang Mai in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Chiang Mai

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:20 am - 10:45 pmONT Ontario-CNX Chiang Mai

25h 25m2 stops Seattle/Tacoma Intl Incheon Intl

12:20 am - 5:12 pmCNX Chiang Mai-ONT Ontario

31h 52m2 stops Incheon Intl Seattle/Tacoma Intl

$828Korean Air

Mon, Nov 2 - Wed, Nov 4

6:20 am - 10:45 pmONT Ontario-CNX Chiang Mai

25h 25m2 stops Seattle/Tacoma Intl Incheon Intl

12:20 am - 10:43 pmCNX Chiang Mai-ONT Ontario

37h 23m2 stops Incheon Intl Seattle/Tacoma Intl

$828Korean Air

Wed, Nov 4 - Wed, Jan 27

6:00 am - 10:55 pmONT Ontario-CNX Chiang Mai

25h 55m2 stops Salt Lake City Incheon Intl

12:15 am - 11:17 amCNX Chiang Mai-ONT Ontario

50h 02m2 stops Incheon Intl Seattle/Tacoma Intl

$828Delta

Sun, Nov 29 - Sat, Dec 5

6:20 am - 10:45 pmONT Ontario-CNX Chiang Mai

25h 25m2 stops Seattle/Tacoma Intl Incheon Intl

12:20 am - 5:19 pmCNX Chiang Mai-ONT Ontario

31h 59m2 stops Incheon Intl Seattle/Tacoma Intl

$828Korean Air

Fri, Nov 6 - Fri, Nov 13

7:00 am - 10:45 pmONT Ontario-CNX Chiang Mai

24h 45m2 stops Seattle/Tacoma Intl Incheon Intl

12:20 am - 10:43 pmCNX Chiang Mai-ONT Ontario

37h 23m2 stops Incheon Intl Seattle/Tacoma Intl

$828Korean Air

Sat, Nov 14 - Mon, Jan 18

7:00 am - 10:45 pmONT Ontario-CNX Chiang Mai

24h 45m2 stops Seattle/Tacoma Intl Incheon Intl

12:20 am - 10:43 pmCNX Chiang Mai-ONT Ontario

37h 23m2 stops Incheon Intl Seattle/Tacoma Intl

$828Korean Air

Sun, Nov 15 - Mon, Jan 18

7:00 am - 10:45 pmONT Ontario-CNX Chiang Mai

24h 45m2 stops Seattle/Tacoma Intl Incheon Intl

12:20 am - 1:57 pmCNX Chiang Mai-ONT Ontario

28h 37m2 stops Incheon Intl Seattle/Tacoma Intl

$828Korean Air

Tue, Feb 23 - Wed, Mar 3

6:20 am - 10:55 pmONT Ontario-CNX Chiang Mai

25h 35m2 stops Seattle/Tacoma Intl Incheon Intl

12:15 am - 11:00 pmCNX Chiang Mai-ONT Ontario

37h 45m2 stops Incheon Intl Seattle/Tacoma Intl

$872Delta

Wed, Nov 4 - Fri, Nov 13

10:50 pm - 10:25 amONT Ontario-CNX Chiang Mai

20h 35m1 stop Taipei City Taiwan Taoyuan Intl

11:25 am - 5:05 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$911China Airlines

Thu, Feb 18 - Sat, Feb 27

10:50 pm - 10:25 amONT Ontario-CNX Chiang Mai

20h 35m1 stop Taipei City Taiwan Taoyuan Intl

11:25 am - 5:05 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$922China Airlines

Tue, Feb 23 - Thu, Mar 4

Cheap last minute flights

Enter your travel dates to find the best prices.

12:45 am - 10:20 amONT Ontario-CNX Chiang Mai

19h 35m1 stop Taipei City Taiwan Taoyuan Intl

11:20 am - 6:40 pmCNX Chiang Mai-ONT Ontario

21h 20m1 stop Taipei City Taiwan Taoyuan Intl

$920China Airlines

Mon, Sep 7 - Thu, Sep 10

12:45 am - 10:20 amONT Ontario-CNX Chiang Mai

19h 35m1 stop Taipei City Taiwan Taoyuan Intl

11:20 am - 6:00 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$928China Airlines

Thu, Sep 10 - Thu, Oct 1

12:45 am - 10:20 amONT Ontario-CNX Chiang Mai

19h 35m1 stop Taipei City Taiwan Taoyuan Intl

11:20 am - 6:00 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$928China Airlines

Thu, Sep 10 - Fri, Oct 2

12:45 am - 1:45 pmONT Ontario-CNX Chiang Mai

23h 00m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

11:20 am - 6:40 pmCNX Chiang Mai-ONT Ontario

21h 20m1 stop Taipei City Taiwan Taoyuan Intl

$958Multiple Airlines

Mon, Sep 7 - Thu, Sep 10

12:45 am - 10:20 amONT Ontario-CNX Chiang Mai

19h 35m1 stop Taipei City Taiwan Taoyuan Intl

11:20 am - 6:00 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$976China Airlines

Thu, Sep 10 - Wed, Sep 30

12:45 am - 1:45 pmONT Ontario-CNX Chiang Mai

23h 00m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

11:20 am - 6:00 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$978China Airlines

Thu, Sep 10 - Fri, Oct 2

12:45 am - 1:45 pmONT Ontario-CNX Chiang Mai

23h 00m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

11:20 am - 6:00 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$978China Airlines

Thu, Sep 10 - Thu, Oct 1

12:45 am - 5:15 pmONT Ontario-CNX Chiang Mai

26h 30m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

10:30 pm - 6:40 pmCNX Chiang Mai-ONT Ontario

34h 10m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$983Multiple Airlines

Mon, Sep 7 - Thu, Sep 10

12:45 am - 1:45 pmONT Ontario-CNX Chiang Mai

23h 00m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

11:20 am - 6:00 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$1,002China Airlines

Wed, Sep 9 - Thu, Oct 1

12:45 am - 1:45 pmONT Ontario-CNX Chiang Mai

23h 00m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

11:20 am - 6:00 pmCNX Chiang Mai-ONT Ontario

20h 40m1 stop Taipei City Taiwan Taoyuan Intl

$1,002China Airlines

Tue, Sep 8 - Fri, Oct 2

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Delta flights from Ontario to Chiang Mai

Our best Delta deals on Ontario to Chiang Mai flight tickets

Delta

Nov 4

ONT6:20 amOntario

25h 35m

2 stops

CNX10:55 pmChiang Mai

Nov 13

CNX12:15 amChiang Mai

37h 45m

2 stops

ONT11:00 pmOntario

$872

Delta

Nov 13

ONT7:00 amOntario

24h 45m

2 stops

CNX10:45 pmChiang Mai

Jan 20

CNX12:20 amChiang Mai

52h 37m

2 stops

ONT1:57 pmOntario

$919

Delta

Nov 13

ONT7:00 amOntario

24h 45m

2 stops

CNX10:45 pmChiang Mai

Jan 15

CNX12:20 amChiang Mai

28h 37m

2 stops

ONT1:57 pmOntario

$946

China Airlines flights from Ontario to Chiang Mai

Our best China Airlines deals on Ontario to Chiang Mai flight tickets

China Airlines

Feb 18

ONT10:50 pmOntario

20h 35m

1 stop

CNX10:25 amChiang Mai

Feb 27

CNX11:25 amChiang Mai

20h 40m

1 stop

ONT5:05 pmOntario

$911

China Airlines

Sep 7

ONT12:45 amOntario

19h 35m

1 stop

CNX10:20 amChiang Mai

Sep 10

CNX11:20 amChiang Mai

21h 20m

1 stop

ONT6:40 pmOntario

$920

China Airlines

Feb 23

ONT10:50 pmOntario

20h 35m

1 stop

CNX10:25 amChiang Mai

Mar 4

CNX11:25 amChiang Mai

20h 40m

1 stop

ONT5:05 pmOntario

$922

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Mon 11/2

6:20 am-10:45 pm

2 stops25h 25m

Chiang Mai

Wed 11/4

12:20 am-5:12 pm

2 stops31h 52m

$828

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Wed 11/4

6:20 am-10:45 pm

2 stops25h 25m

Chiang Mai

Wed 1/27

12:20 am-10:43 pm

2 stops37h 23m

$828

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Sun 11/29

6:00 am-10:55 pm

2 stops25h 55m

Chiang Mai

Sat 12/5

12:15 am-11:17 am

2 stops50h 02m

$828

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Fri 11/6

6:20 am-10:45 pm

2 stops25h 25m

Chiang Mai

Fri 11/13

12:20 am-5:19 pm

2 stops31h 59m

$828

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Sat 11/14

7:00 am-10:45 pm

2 stops24h 45m

Chiang Mai

Mon 1/18

12:20 am-10:43 pm

2 stops37h 23m

$828

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Sun 11/15

7:00 am-10:45 pm

2 stops24h 45m

Chiang Mai

Mon 1/18

12:20 am-10:43 pm

2 stops37h 23m

$828

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Tue 2/23

7:00 am-10:45 pm

2 stops24h 45m

Chiang Mai

Wed 3/3

12:20 am-1:57 pm

2 stops28h 37m

$828

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Wed 11/4

6:20 am-10:55 pm

2 stops25h 35m

Chiang Mai

Fri 11/13

12:15 am-11:00 pm

2 stops37h 45m

$872

Quickest round-trip

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Thu 2/18

10:50 pm-10:25 am

1 stop20h 35m

Chiang Mai

Sat 2/27

11:25 am-5:05 pm

1 stop20h 40m

$911

OntarioChiang Mai

ONT Ontario - CNX Chiang Mai

ONTCNX

Ontario

Tue 2/23

10:50 pm-10:25 am

1 stop20h 35m

Chiang Mai

Thu 3/4

11:25 am-5:05 pm

1 stop20h 40m

$922

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to Chiang Mai

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Can stopping save me money on Ontario to Chiang Mai flights?

You could potentially save up to 29% on your flight if you consider stops on a Ontario to Chiang Mai flight.

When to book flights from Ontario to Chiang Mai

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Chiang Mai according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Ontario to Chiang Mai (ONT to CNX) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Chiang Mai

Best Price Found	$415
Fastest flight time	20h 35m
Direct flights	None

The best one-way flight to Chiang Mai from Ontario in the past 72 hours is $415. The best round-trip flight deal from Ontario to Chiang Mai found on momondo in the last 72 hours is $828.

The fastest flight from Ontario to Chiang Mai takes 20h 35m

There are no direct flights from Ontario to Chiang Mai. There are no popular flight routes from Ontario to Chiang Mai.

Search flight deals

Frequently asked questions about flying from Ontario to Chiang Mai

How far is Ontario to Chiang Mai by plane?
Ontario and Chiang Mai are 8055.9 mi apart from one another. Flights usually cover this in 20h 35m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Ontario Airport to Chiang Mai Airport?
Prices for flights from Ontario Airport to Chiang Mai Airport were last updated today.
How many operators does momondo search for flights from Ontario Airport to Chiang Mai Airport?
As of September 2026, there is 1 operator available to choose from for flights from Ontario Airport to Chiang Mai Airport.
How old do you have to be to fly from Ontario Airport to Chiang Mai Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Chiang Mai Airport.
What documentation or ID do you need to fly to Chiang Mai Airport?
The travel and health documents required for your trip to Chiang Mai Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Chiang Mai Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Ontario to Chiang Mai?
Based on momondo bookings for flights between Ontario and Chiang Mai, the leading airline is China Airlines, making up 100% of the total bookings.

Best airlines flying from Ontario to Chiang Mai

Compare and see reviews for airlines that fly from Ontario to Chiang Mai with momondo

Airline	Rating	Free Cancellation	Price
China Airlines	PriceFrom $742	Free Cancellation	Rating 8.3 844 reviews		Search China Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Chiang Mai?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Chiang Mai. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to Chiang Mai with flexible booking policies on momondo?

Flights from Ontario to Chiang Mai with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to Chiang Mai?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Chiang Mai.

I’m not ready to book a flight from Ontario to Chiang Mai right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Chiang Mai from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Cheap flights from Ontario to Chiang Mai from $415

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Chiang Mai departing on 1/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Delta flights from Ontario to Chiang Mai

Our best Delta deals on Ontario to Chiang Mai flight tickets

China Airlines flights from Ontario to Chiang Mai

Our best China Airlines deals on Ontario to Chiang Mai flight tickets

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Use the filters below to find and compare flights from Ontario to Chiang Mai that are best for you.

See travel insights to Chiang Mai from

How to get the cheapest flight ticket from Ontario to Chiang Mai

Can stopping save me money on Ontario to Chiang Mai flights?

What is the cheapest airline that flies from Ontario to Chiang Mai?

What airlines fly to Chiang Mai?

When to book flights from Ontario to Chiang Mai

Cheap Ontario to Chiang Mai (ONT to CNX) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Ontario to Chiang Mai

Best airlines flying from Ontario to Chiang Mai

Compare and see reviews for airlines that fly from Ontario to Chiang Mai with momondo

Why use momondo?

An easier way to manage your Chiang Mai trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Thailand

Airports servicing Thailand

Fly your favorite airline to Chiang Mai

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Chiang Mai

List of cabin classes available on flights landing in Chiang Mai. Availability may vary depending on flight origin and airline.

Popular cities in Thailand

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Ontario

According to popular flight searches on momondo this year

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