Cheap flights from Washington to Seoul from $441

The cheapest month to fly to Incheon Intl Airport from State of Washington is in September. Flight prices, which tend to average around $284, 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 September, then departing from State of Washington during the month March is also very affordable. Most momondo users find prices during this month for around $333.

The cheapest day to depart from State of Washington to Incheon Intl Airport is on a Wednesday when prices can be found for as low as $672. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $885. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

In the evening is the cheapest time of day to fly from State of Washington to Incheon Intl Airport when you can find flight prices for as low as $728. Flying to Incheon Intl Airport in the evening 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 $876 on average. Flights to Incheon Intl Airport from State of Washington 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 Washington - Incheon Intl flight prices

You are more likely to see cheaper flights to Incheon Intl Airport from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Incheon Intl Airport for around $856 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 State of Washington for as low as $580 on momondo.

Delta, United Airlines, and Alaska Airlines are the most popular carriers operating from Washington to Incheon Intl

Alaska Airlines, Korean Air and Asiana Airlines are the top three most popular airlines that fly to Incheon Intl Airport from State of Washington according to our data. Alaska Airlines is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Incheon Intl Airport. Keep in mind that there are 9 different airlines that fly to Incheon Intl Airport on a routine basis, so you have a few additional options to choose from.

As of May 2026, there are 7 flights per day flying from State of Washington to Incheon Intl Airport. The most common time of day flights depart is 12:00AM, with 63% of flights taking off in the afternoon.

The number of flights available between State of Washington and Incheon Intl Airport is 55 per week as of May 2026. The most frequent departure day is Fri, with 18% of weekly flights leaving on this day.