Cheap flights from the United States to Seoul from $399

The cheapest month to fly to Incheon Intl Airport from United States is in April. Flight prices, which tend to average around $908, 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 United States during the month August is also very affordable. Most momondo users find prices during this month for around $931.

The cheapest day to depart from United States to Incheon Intl Airport is on a Sunday when prices can be found for as low as $1,035. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,185. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

In the morning is the cheapest time of day to fly from United States to Incheon Intl Airport when you can find flight prices for as low as $1,042. Flying to Incheon Intl Airport in the morning 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 evening when prices are $1,107 on average. Flights to Incheon Intl Airport from United States in the evening 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 United States - Incheon Intl flight prices

You are more likely to see cheaper flights to Incheon Intl Airport from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Incheon Intl Airport for around $1,534 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 United States for as low as $1,280 on momondo.

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

AIR PREMIA, Korean Air and Asiana Airlines are the top three most popular airlines that fly to Incheon Intl Airport from United States 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 24 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 23% of flights between United States and Incheon have experienced a delay on any given week. The average delay length over the past 12 months has been 166 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. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, AIR PREMIA have had the least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.

As of May 2026, there are 63 flights per day flying from United States to Incheon Intl Airport. The most common time of day flights depart is 11:00PM, with 30% of flights taking off in the evening.

444 flights are operational weekly from United States to Incheon Intl Airport as of May 2026. The most popular departure day for this route is Wed, with 16% of flights per week taking off on this day.