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Chiang Mai

$507+ Cheap flights from Seattle (SEA) to Chiang Mai (CNX)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — CNX
May 21 — May 281
Thu 5/21
Thu 5/28
1 adult, Economy
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Cheap flight deals from Seattle to Chiang Mai

Cheapest flights from Seattle to Chiang Mai
Explore the most affordable flight options available from Seattle to Chiang Mai. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 21, 2026.

This Justfly.com deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/110:15 am
SEA
-
CNX
1 stop40h 20m
Singapore Airlines
Sat 10/3112:05 pm
CNX
-
SEA
1 stop34h 05m
Singapore Airlines
Deal found 4/18$931
This Kiwi.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/1311:10 pm
SEA
-
CNX
2 stops25h 25m
Multiple Airlines
Sat 9/1911:20 am
CNX
-
SEA
1 stop21h 55m
Multiple Airlines
Deal found 4/17$963
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/211:00 am
SEA
-
CNX
1 stop20h 55m
Korean Air
Mon 11/1612:15 am
CNX
-
SEA
1 stop23h 45m
Korean Air
Deal found 4/18$971
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/37:20 am
SEA
-
CNX
2 stops24h 35m
Korean Air
Mon 11/1612:15 am
CNX
-
SEA
1 stop23h 45m
Korean Air
Deal found 4/18$972
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/27:20 am
SEA
-
CNX
2 stops24h 35m
Korean Air
Sun 11/1512:15 am
CNX
-
SEA
1 stop23h 45m
Korean Air
Deal found 4/18$977
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/37:20 am
SEA
-
CNX
2 stops24h 35m
Korean Air
Wed 11/1112:15 am
CNX
-
SEA
2 stops30h 10m
Korean Air
Deal found 4/18$979
This Justfly.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:15 am
SEA
-
CNX
1 stop40h 20m
Singapore Airlines
Tue 9/225:35 pm
CNX
-
SEA
1 stop53h 10m
Singapore Airlines
Deal found 4/17$980
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/27:20 am
SEA
-
CNX
2 stops24h 35m
Korean Air
Tue 11/1712:15 am
CNX
-
SEA
2 stops30h 10m
Korean Air
Deal found 4/18$988
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/111:00 am
SEA
-
CNX
1 stop20h 55m
Korean Air
Wed 11/1112:15 am
CNX
-
SEA
1 stop23h 45m
Korean Air
Deal found 4/18$1,010
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/307:20 am
SEA
-
CNX
2 stops25h 35m
Korean Air
Wed 11/1112:15 am
CNX
-
SEA
1 stop23h 45m
Korean Air
Deal found 4/18$1,011
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/27:20 am
SEA
-
CNX
2 stops24h 35m
Korean Air
Sat 11/1412:15 am
CNX
-
SEA
1 stop23h 45m
Korean Air
Deal found 4/18$1,016
This Korean Air deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/211:00 am
SEA
-
CNX
1 stop20h 55m
Korean Air
Thu 11/1212:15 am
CNX
-
SEA
2 stops30h 10m
Korean Air
Deal found 4/18$1,017

Find flight deals from Seattle to Chiang Mai

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Chiang Mai (CNX). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$931
(Justfly.com)

One-way from

$507
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$867
Provider with most accurate pricing for Seattle/Tacoma Intl-Chiang Mai flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Chiang Mai flights.
Search Deals
From Seattle/Tacoma Intl to Chiang Mai
Search Deals
One-way flight from Seattle/Tacoma Intl to Chiang Mai
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($133 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($59 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Chiang Mai that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 21, 2026.
Use the filters below to find and compare flights from Seattle to Chiang Mai that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Thu 9/10

10:15 am-4:35 pm

1 stop40h 20m

Chiang Mai

Mon 9/14

5:35 pm-8:45 am

1 stop29h 10m

$1,175

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Wed 9/9

1:30 am-7:10 pm

2 stops27h 40m

Chiang Mai

Mon 9/14

11:55 am-7:40 pm

2 stops21h 45m

$1,194
Quickest round-trip

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Sat 9/12

1:55 am-10:20 am

1 stop18h 25m

Chiang Mai

Sat 9/19

11:20 am-7:15 pm

1 stop21h 55m

$1,204

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Sun 5/17

7:18 pm-1:25 pm

2 stops52h 07m

Chiang Mai

Sun 5/24

2:55 pm-12:56 pm

2 stops60h 01m

$1,299

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Tue 8/4

4:25 pm-9:20 am

2 stops26h 55m

Chiang Mai

Sun 8/23

8:00 pm-12:25 pm

2 stops30h 25m

$1,347

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Tue 8/4

4:25 pm-9:20 am

2 stops26h 55m

Chiang Mai

Fri 8/21

8:00 pm-12:25 pm

2 stops54h 25m

$1,390

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Mon 8/3

4:25 pm-1:45 pm

2 stops31h 20m

Chiang Mai

Wed 8/26

8:00 pm-12:25 pm

2 stops54h 25m

$1,390

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Wed 6/3

5:15 pm-11:15 am

2 stops28h 00m

Chiang Mai

Wed 6/17

8:00 pm-1:25 pm

2 stops31h 25m

$1,394

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Thu 5/21

5:15 pm-7:10 pm

2 stops35h 55m

Chiang Mai

Thu 7/9

8:00 pm-1:25 pm

2 stops31h 25m

$1,462

SeattleChiang Mai

SEA - CNX

SEACNX

Seattle/Tacoma Intl

Thu 7/9

1:10 am-10:25 am

1 stop19h 15m

Chiang Mai

Mon 7/13

11:35 am-7:50 pm

1 stop22h 15m

$1,494

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/20

Showing 1-10 of 21 resultsSorted by cheapest first
1
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3

Compare providers for flights from Seattle to Chiang Mai

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Chiang Mai in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Chiang Mai flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Chiang Mai flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Chiang Mai flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Chiang Mai flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Chiang Mai flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Chiang Mai

Have a flexible travel schedule? Discover the best time to fly to Chiang Mai from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Chiang Mai

How far ahead should I book a flight from Seattle to Chiang Mai?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Chiang Mai. Price data was last updated on April 17, 2026.

To ensure you get the cheapest price possible for a flight from Seattle to Chiang Mai, you should look to book at least 35 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Seattle to Chiang Mai?

Currently, September is the cheapest month in which you can book a flight from Seattle to Chiang Mai (average of $772). Flying from Seattle to Chiang Mai in December is currently the most expensive (average of $1,663). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Seattle to Chiang Mai?

Reviews of airlines servicing Chiang Mai

Get insights into the airlines that provide service to Chiang Mai. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Chiang Mai. Reviews last updated April 21, 2026.
Peruse reviews from past customers who have flown with EVA Air,Korean Air, andChina Airlines from Seattle to Chiang Mai to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.5
Very good
1,422 reviews

Crew

8.6

Entertainment

8.0

Food

8.1

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
EVA Air
8.5
Very good
1,422 reviews
EVA Air
8.5
Very good
1,422 reviews

Crew

8.6

Entertainment

8.0

Food

8.1

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
Korean Air
8.4
Very good
1,212 reviews
EVA Air
8.5
Very good
1,422 reviews

Crew

8.6

Entertainment

8.0

Food

8.1

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
China Airlines
8.3
Very good
818 reviews
EVA Air
8.5
Very good
1,422 reviews

Crew

8.6

Entertainment

8.0

Food

8.1

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
Singapore Airlines
8.2
Very good
1,501 reviews
EVA Air
8.5
Very good
1,422 reviews

Crew

8.6

Entertainment

8.0

Food

8.1

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?
Asiana Airlines
8.0
Very good
519 reviews
EVA Air
8.5
Very good
1,422 reviews

Crew

8.6

Entertainment

8.0

Food

8.1

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

TPE - SFO

Why when we’re about to board they suddenly announced the letters ABC to board first .. so what is the use us waiting at the door (with wheelchairs) ended up almost at the end to board and I can see people walking boarding first? Is this something new? You go by letters now?

Related info for your journey

Find useful and relevant information for your journey from Seattle to Chiang Mai. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Chiang Mai?

    A quick flight from Seattle to Chiang Mai can take about 18h 25m. EVA Air provides one of the quickest options available for as low as $1,204. There are 7190 mi between Seattle and Chiang Mai. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to Chiang Mai round-trip?

    According to our current data, Korean Air ($418), Asiana Airlines ($675), and China Airlines ($736) offers the cheapest pricing from Seattle to Chiang Mai. Users have found that Korean Air is 58% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Chiang Mai one-way?

    The cheapest airline one-way is Asiana Airlines, with whom users have recently found tickets for as low as $347. However, be on the lookout for offers from China Airlines and Korean Air, as they are both options that can get you from Seattle to Chiang Mai for a low price.

  • Where are the most common layover locations when flying from Seattle to Chiang Mai?

    Most of the time, Seattle to Chiang Mai flights that have layovers will stop in Seoul.

  • What are some popular things to do or see while on a layover in Seoul?

    Dongdaemun Market, Lotte World, and Gwanghwamun are the most popular attractions in Seoul if you're in need of something to do during your layover. Dongdaemun Market, Lotte World, and Gwanghwamun can be visited by traveling about 31.6 mi, 35.7 mi, and 30.1 mi respectively from Incheon Intl. Those looking to explore during their layover in Seoul can rent a car from Incheon Intl for about $47 per day.

  • Where are the least popular layover locations for Seattle to Chiang Mai flights?

    The least popular layover on flights from Seattle to Chiang Mai is Taipei City.

  • Can I find deals for flights from Seattle to Chiang Mai that include hotel bookings?

    Yes. In addition to deals on Seattle to Chiang Mai flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Chiang Mai?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Chiang Mai.

  • Can I find deals for business class flights from Seattle to Chiang Mai?

    Yes. Cheapflights offers flight deals from Seattle to Chiang Mai by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Chiang Mai?

    Currently, September is the cheapest month in which you can book a flight from Seattle to Chiang Mai (average of $772). Flying from Seattle to Chiang Mai in December is currently the most expensive (average of $1,663). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 5 airlines flying from Seattle to Chiang Mai

Discover the top 5 airlines that operate flights from Seattle to Chiang Mai. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
Korean AirCheapest$418Average$837FlexibilityNo cancel feeOn-time81%
Asiana AirlinesCheapest$675Average$951FlexibilityNo cancel feeOn-time76%
China AirlinesCheapest$736Average$830FlexibilityNo cancel feeOn-time70%
Singapore AirlinesCheapest$768Average$1,094FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$853Average$962FlexibilityNo cancel feeOn-time74%

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