The cheapest times to fly from SEA to CNX are

  • February 5th to May 13th
  • August 27th to December 2nd (except the weeks of November 5th and November 19th)

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 SEA to CNX is late August to early September. Prices can be as high as $1672 for Sunday flights during mid December, or as low as $631 for Tuesday flights around late August to early September.


When to Fly to Chiang Mai

Flying from Seattle, WA (SEA) to Chiang Mai (CNX) will usually cost between $661 to $1211 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late August to early September with an average ticket price of $694. Due to high demand the most expensive time to fly is mid December, with an average price of $1471. Planning your trip to low-cost times can easily save you $777 on economy flights and even more on first-class flights. Generally, any price below $785 can be considered a good price for a round-trip SEA to CNX flight.

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

SEA to CNX Flight Prices

Compared to other flights, the SEA to CNX flight is cheaper than the average and costs less than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.07, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to CNX, and Sunday the cheapest day to fly back into SEA. Sundays are the most expensive days to fly to Chiang Mai, and Wednesdays are the most expensive days to return to Seattle. Selecting flights on the least expensive days could save you up to $55 (6%) 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 $826. Return trip prices are from the CNX to SEA 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 SEA 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 13 hour 56 minutes may not be realistic.


Flight Questions Answered

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

Which airlines fly this route?

You can find 29 major airlines flying this route most often: Air Astana, Air Canada, Air China, Alaska, American, ANA, Asiana, Austrian, Bangkok Airways, Cathay Dragon, Cathay Pacific, China Airlines, China Eastern, China Southern, Delta, Emirates, Etihad, EVA Air, Hainan, JAL, Korean Air, Lufthansa, Qatar Airways, Shenzhen, Singapore Airlines, SWISS, THAI, United, Vietnam Airlines, and potentially more during busy seasons.

How far away is it from Chiang Mai International Airport to Seattle/Tacoma International Airport?

The distance between the two airports is roughly 7194 miles or 11578 kilometers.

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

The real-world flight time for a nonstop SEA to CNX flight is about 13 hour 56 minutes.

How many flights go between Seattle, WA and Chiang Mai?

It depends on the day of the week and the date, but a typical day might have around 72 available flights from SEA to CNX.


Airport Location Info


Departing Airport

Origination code SEA
Origination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3

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.