The cheapest times to fly from CJU to SEA are

  • January 15th to April 1st
  • October 8th to December 23rd

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 CJU to SEA is early to mid March. Prices can be as high as $4648 for Thursday flights during early August, or as low as $693 for Tuesday flights around early to mid March.


When to Fly to Seattle

Flying from Jeju (CJU) to Seattle, WA (SEA) will usually cost between $697 to $3026 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid March with an average ticket price of $756. Due to high demand the most expensive time to fly is early August, with an average price of $4568. Planning your trip to low-cost times can easily save you $3812 on economy flights and even more on first-class flights. Generally, any price below $979 can be considered a good price for a round-trip CJU to SEA flight.

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

CJU to SEA Flight Prices

Compared to other flights, the CJU to SEA flight is priced close to the average and costs about as much as the average flight leaving from Jeju-si. The average price per mile (for a direct flight) is $0.11, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to SEA, and Wednesday the cheapest day to fly back into CJU. Thursdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $870 (42%) 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 $888. Return trip prices are from the SEA to CJU 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 CJU to SEA can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 10 hour 43 minutes may not be realistic.


Flight Hacking CJU to SEA

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from CJU to SEA — but Champion Traveler does!

Hack #1: Busan (CJU > PUS > SEA)

  • Price for both tickets: $822
  • Average savings: $157 (16.04%)

See CJU to GMP flights

Hack #2: Seoul (CJU > GMP > SEA)

  • Price for both tickets: $844
  • Average savings: $135 (13.79%)

See CJU to PUS flights

Hack #3: Beijing (CJU > PEK > SEA)

  • Price for both tickets: $943
  • Average savings: $36 (3.68%)

See CJU to PEK flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 7 major airlines flying this route most often: Air China, Asiana, Cathay Pacific, China Eastern, China Southern, JAL, Korean Air, and potentially more during busy seasons.

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

The distance between the two airports is roughly 5409 miles or 8705 kilometers.

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

The real-world flight time for a nonstop CJU to SEA flight is about 10 hour 43 minutes.

How many flights go between Jeju and Seattle, WA?

It depends on the day of the week and the date, but a typical day might have around 22 available flights from CJU to SEA.


Airport Location Info


Departing Airport

Origination codeCJU
Origination airport nameJeju International Airport
CountrySouth Korea

Return Airport

Destination codeSEA
Destination airport nameSeattle/Tacoma International Airport
CitySeattle, WA
Countrythe United States


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.