Cheap flights from Incheon Intl Airport to Seattle from $323

In general, November is the cheapest month to fly from Incheon Intl Airport to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $532. If you don’t want to visit Seattle in November, then you should wait until September to fly from Incheon Intl Airport, when ticket prices are also cheap, with an average price of $584.

On average, the least expensive day to fly to Seattle from Incheon Intl Airport is on a Monday. momondo users have found tickets for Monday departures for as low as $706. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Incheon Intl Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $884.

Flying to Seattle from Incheon Intl Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $733 when looking at flights departing in the evening. Flights to Seattle are more costly in the afternoon, with an average ticket price of $748. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to Seattle from Incheon Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $686 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Incheon Intl Airport for as low as $538 on momondo.

There are 4 cabin classes available to choose from on Incheon Intl to Seattle/Tacoma Intl 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 19% on your flight if you consider stops on a Incheon Intl Airport to Seattle flight.

As of March 2026, prices for Incheon Intl Airport to Seattle flights are approximately 38% cheaper when compared to flights at the same time last year.

Korean Air, Delta, and United Airlines are the most popular carriers operating from Incheon Intl to Seattle/Tacoma Intl

Korean Air, Asiana Airlines and Delta are the top three most popular airlines that fly to Seattle from Incheon Intl Airport according to our data. Korean Air is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 8 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Historically, on average around 28% of flights between Incheon and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 155 minutes.

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

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Friday 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 21% of their flights experiencing any sort of delay.

San Francisco (SFO) was the most common stop: 88% of momondo users choosing 1-stop flights on this route connected there.

Flights via Taipei City (TPE) offer the lowest average round-trip price of $963.

Flights connecting via Taipei City (TPE) have the shortest average one-way travel time: 15h 10m.

Taipei City (TPE) has the shortest average layover time for this route: 1h 55m.

The number of flights available between Incheon Intl Airport and Seattle is 8 per day as of March 2026. The most frequent departure time is 8:00PM, with 74% of daily flights leaving in the evening.

As of March 2026, 59 flights take off from Incheon Intl Airport and land in Seattle each week. The most common flight departure day for this route is Fri, with 19% of weekly flights taking off on this day.