Cheap flights from Washington to Seoul from $377

The cheapest month to fly to Incheon Intl Airport from State of Washington is in April. 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 April, then departing from State of Washington during the month August is also very affordable. Most momondo users find prices during this month for around $338.

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 $673. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $906. 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 $714. 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 afternoon when prices are $1,401 on average. Flights to Incheon Intl Airport from State of Washington in the afternoon 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 $879 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 $564 on momondo.

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

Alaska Airlines, Delta, and United 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 56% of people opting to fly with this airline when traveling to Incheon Intl Airport. Keep in mind that there are 11 different airlines that fly to Incheon Intl Airport on a routine basis, so you have a few additional options to choose from.

As of March 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 12:00PM, with 66% of flights taking off in the afternoon.

The number of flights available between State of Washington and Incheon Intl Airport is 52 per week as of March 2026. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.