Cheap flights from Seattle to Seoul from $389

The cheapest month to fly to Incheon Intl Airport from Seattle is in August. Flight prices, which tend to average around $338, are often lower during this time because this is during the off-season. If you are unable to visit Incheon Intl Airport during the month of August, then departing from Seattle during the month April is also very affordable. Most momondo users find prices during this month for around $338.

The cheapest day to depart from Seattle to Incheon Intl Airport is on a Wednesday when prices can be found for as low as $655. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $865. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

At noon is the cheapest time of day to fly from Seattle to Incheon Intl Airport when you can find flight prices for as low as $398. Flying to Incheon Intl Airport at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $871 on average. Flights to Incheon Intl Airport from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Seattle/Tacoma Intl to Incheon Intl for the best Seattle/Tacoma Intl - Incheon Intl flight prices

You are more likely to see cheaper flights to Incheon Intl Airport from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Incheon Intl Airport for around $836 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Incheon Intl Airport from Seattle for as low as $487 on momondo.

There are 3 cabin classes available to choose from on Seattle to Incheon Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 33% on your flight if you consider stops on a Seattle to Incheon Intl Airport flight.

As of August 2026, prices for Seattle to Incheon Intl Airport flights are approximately 67% cheaper when compared to flights at the same time last year.

Cathay Pacific and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Incheon Intl

Alaska Airlines, Korean Air and Asiana Airlines are the top three most popular airlines that fly to Incheon Intl Airport from Seattle according to our data. Alaska Airlines is the first choice among our users, with 59% of people opting to fly with this airline when traveling to Incheon Intl Airport. Keep in mind that there are 7 different airlines that fly to Incheon Intl Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 28% of flights between Seattle and Incheon have experienced a delay on any given week. The average delay length over the past 12 months has been 150 minutes.

Generally, flights departing at night tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, Delta have had the least number of delays on this route over the last 12 months; with about 19% of their flights experiencing any sort of delay.

Vancouver (YVR) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Flights via Hong Kong (HKG) offer the lowest average round-trip price of $749.

Flights connecting via Vancouver (YVR) have the shortest average one-way travel time: 14h 31m.

San Francisco (SFO) has the shortest average layover time for this route: 1h 32m.

5 flights are operational daily from Seattle to Incheon Intl Airport as of August 2026. The most popular departure time for this route is 1:00PM, with 63% of flights per day taking off in the afternoon.

35 flights are operational weekly from Seattle to Incheon Intl Airport as of August 2026. The most popular departure day for this route is Fri, with 26% of flights per week taking off on this day.