Cheap flights from Seattle to South Korea from $342

If you aren’t able to travel to South Korea during the month of April, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $376.

On average, the least expensive day to fly to South Korea from Seattle is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $659. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to South Korea for around $861.

Flying to South Korea from Seattle at noon is the least expensive time of day to depart. momondo users have found prices as low as $381 when looking at flights departing at noon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $874 on average. Flights to South Korea 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 - South Korea flight prices

You are more likely to see cheaper flights to South Korea from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to South Korea for around $849 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to South Korea from Seattle for as low as $560 on momondo.

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

China Airlines, EVA Air, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to South Korea

Alaska Airlines, Korean Air and Asiana Airlines are the top three most popular airlines that fly to South Korea from Seattle according to our data. Alaska Airlines is the first choice among our users, with 58% of people opting to fly with this airline when traveling to South Korea. Keep in mind that there are 7 different airlines that fly to South Korea on a routine basis, so you have a few additional options to choose from.

Historically, on average around 26% of flights between Seattle and South Korea have experienced a delay on any given week. The average delay length over the past 12 months has been 148 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.

The number of flights available between Seattle and South Korea is 6 per day as of September 2026. The most frequent departure time is 12:00AM, with 63% of daily flights leaving in the afternoon.

As of September 2026, there are 45 flights per week flying from Seattle to South Korea. The most common day of the week flights depart is Mon, with 20% of flights taking off on this day.