Cheap flights from Incheon Intl Airport to Seattle from $388

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 $575.

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 $707. 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 $920.

Flying to Seattle from Incheon Intl Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $753 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the evening, with an average ticket price of $754. Departure times in the evening 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 $698 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 $589 on momondo.

You could potentially save up to 28% on your flight if you consider stops on a Incheon Intl Airport to Seattle flight.

As of April 2026, prices for Incheon Intl Airport to Seattle flights are approximately 33% cheaper when compared to flights at the same time last year.

United Airlines and Alaska 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 41% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Historically, on average around 26% 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 164 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 20% of their flights experiencing any sort of delay.

The number of flights available between Incheon Intl Airport and Seattle is 5 per day as of April 2026. The most frequent departure time is 9:00PM, with 70% of daily flights leaving in the evening.

As of April 2026, 37 flights take off from Incheon Intl Airport and land in Seattle each week. The most common flight departure day for this route is Mon, with 22% of weekly flights taking off on this day.