Cheap flights from Washington, D.C. to Seoul from $423

The cheapest month to fly to Incheon Intl Airport from Washington, D.C. is in October. Flight prices, which tend to average around $219, 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 October, then departing from Washington, D.C. during the month April is also very affordable. Most momondo users find prices during this month for around $247.

The cheapest day to depart from Washington, D.C. to Incheon Intl Airport is on a Tuesday when prices can be found for as low as $1,247. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,501. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

At noon is the cheapest time of day to fly from Washington, D.C. to Incheon Intl Airport when you can find flight prices for as low as $1,283. Flying to Incheon Intl Airport at noon 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 $1,367 on average. Flights to Incheon Intl Airport from Washington, D.C. in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Washington, D.C. Dulles Intl to Incheon Intl for the best Washington, D.C. - Incheon Intl flight prices

You are more likely to see cheaper flights to Incheon Intl Airport from Washington, D.C. when booking weeks ahead of your departure date. In general, you can expect to find flights to Incheon Intl Airport for around $1,597 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 Washington, D.C. for as low as $1,366 on momondo.

There are 4 cabin classes available to choose from on Washington, D.C. to Incheon Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between Washington, D.C. to Incheon Intl Airport.

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

Delta, AIR PREMIA, and Cathay Pacific are the most popular carriers operating from Washington, D.C. to Incheon Intl

AIR PREMIA, Korean Air and Delta are the top three most popular airlines that fly to Incheon Intl Airport from Washington, D.C. according to our data. AIR PREMIA is the first choice among our users, with 49% 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.

Historically, on average around 24% of flights between Washington, D.C. and Incheon have experienced a delay on any given week. The average delay length over the past 12 months has been 97 minutes.

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

Saturday 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, Korean Air have had the least number of delays on this route over the last 12 months; with about 25% of their flights experiencing any sort of delay.

Toronto (YYZ) was the most common stop: 35% of momondo users choosing 1-stop flights on this route connected there.

Flights via Beijing (PEK) offer the lowest average round-trip price of $698.

Flights connecting via Toronto (YYZ) have the shortest average one-way travel time: 18h 29m.

Toronto (YYZ) has the shortest average layover time for this route: 1h 42m.

2 flights are operational daily from Washington, D.C. to Incheon Intl Airport as of July 2026. The most popular departure time for this route is 1:00PM, with 100% of flights per day taking off in the afternoon.

The number of flights available between Washington, D.C. and Incheon Intl Airport is 17 per week as of July 2026. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.