$505 Cheap Flights from Seoul (GMP) to Washington (IAD)

View $505 flight on Tue, Sep 30, 2025Opens in a new window

Popular airlines from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD)

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Seoul to Washington (GMP-IAD)

Prices were available within the past 7 days and start at $505 for one-way flights and $1,072 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

All Nippon Airways
Mon, Sep 1 - Tue, Sep 30
GMP
Seoul
IAD
Washington
$1,072 Roundtrip, found 1 day ago
$1,072
Roundtrip
found 1 day ago
Select All Nippon Airways flight, departing Mon, Sep 1 from Seoul to Washington, returning Tue, Sep 30, priced at $1,072 found 1 day ago
All Nippon Airways
Wed, Sep 3 - Wed, Sep 10
GMP
Seoul
IAD
Washington
$1,073 Roundtrip, found 7 hours ago
$1,073
Roundtrip
found 7 hours ago
Select All Nippon Airways flight, departing Wed, Sep 3 from Seoul to Washington, returning Wed, Sep 10, priced at $1,073 found 7 hours ago
All Nippon Airways
Mon, Jul 14 - Mon, Jul 21
GMP
Seoul
IAD
Washington
$1,075 Roundtrip, found 5 days ago
$1,075
Roundtrip
found 5 days ago
Select All Nippon Airways flight, departing Mon, Jul 14 from Seoul to Washington, returning Mon, Jul 21, priced at $1,075 found 5 days ago
All Nippon Airways
Wed, Sep 3 - Wed, Sep 10
GMP
Seoul
IAD
Washington
$1,076 Roundtrip, found 7 hours ago
$1,076
Roundtrip
found 7 hours ago
Select All Nippon Airways flight, departing Wed, Sep 3 from Seoul to Washington, returning Wed, Sep 10, priced at $1,076 found 7 hours ago
Asiana Airlines
Tue, Aug 12 - Tue, Aug 19
GMP
Seoul
IAD
Washington
$1,080 Roundtrip, found 2 days ago
$1,080
Roundtrip
found 2 days ago
Select Asiana Airlines flight, departing Tue, Aug 12 from Seoul to Washington, returning Tue, Aug 19, priced at $1,080 found 2 days ago
Jeju Air
Tue, Aug 12 - Tue, Aug 19
GMP
Seoul
IAD
Washington
$1,088 Roundtrip, found 2 days ago
$1,088
Roundtrip
found 2 days ago
Select Jeju Air flight, departing Tue, Aug 12 from Seoul to Washington, returning Tue, Aug 19, priced at $1,088 found 2 days ago
Asiana Airlines
Tue, Aug 12 - Tue, Aug 19
GMP
Seoul
IAD
Washington
$1,091 Roundtrip, found 2 days ago
$1,091
Roundtrip
found 2 days ago
Select Asiana Airlines flight, departing Tue, Aug 12 from Seoul to Washington, returning Tue, Aug 19, priced at $1,091 found 2 days ago
Jeju Air
Tue, Aug 12 - Tue, Aug 19
GMP
Seoul
IAD
Washington
$1,099 Roundtrip, found 2 days ago
$1,099
Roundtrip
found 2 days ago
Select Jeju Air flight, departing Tue, Aug 12 from Seoul to Washington, returning Tue, Aug 19, priced at $1,099 found 2 days ago
Japan Airlines
Tue, Sep 9 - Tue, Sep 30
GMP
Seoul
IAD
Washington
$1,196 Roundtrip, found 1 day ago
$1,196
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Tue, Sep 9 from Seoul to Washington, returning Tue, Sep 30, priced at $1,196 found 1 day ago
Air China
Tue, Aug 12 - Tue, Aug 19
GMP
Seoul
IAD
Washington
$1,209 Roundtrip, found 2 days ago
$1,209
Roundtrip
found 2 days ago
Select Air China flight, departing Tue, Aug 12 from Seoul to Washington, returning Tue, Aug 19, priced at $1,209 found 2 days ago

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ronald Reagan Washington National DCA. Closest option available. Average driving time to city center is 8 minutes. Flights from $1,497
DCA
Ronald Reagan Washington National
Closest
Average driving time to city center8 min
Flights from $1,497
Flights from Seoul (GMP) to Washington (IAD)
Origin airport
Gimpo Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
All Nippon Airways
Roundtrip price
$1,072
Distance
6929 mi

Seoul to Washington Flights

The cheapest times to fly from Seoul to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seoul to Washington are during the month of September. You can find some of the cheapest flights from Seoul to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seoul to Washington

Sunday is one of the best days to book for cheap flights from Seoul to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seoul to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seoul to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $505 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seoul to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seoul to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD) cost?
Discover the latest flight deals from GMP to IAD by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from GMP to IAD?
The cheapest flights from GMP to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD)?
Although Seoul (GMP-Gimpo Intl.) doesn't offer any direct flights to Washington Dulles Intl. Airport (IAD), other airports have nonstop routes. Departing from Incheon Intl. Airport (ICN) will get you to Washington without any layovers.
What is the cheapest airline that flies from GMP to IAD?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from GMP to IAD. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD)?
There aren't any daily direct flights available from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD). But you can choose flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from GMP to IAD?
Typically you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* However, this can change based on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD)?
To avoid potential delays on the Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD) route, aim to fly before 3 PM. Departures after this time have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD) last-minute?
Waiting until just before your departure to book a flight from GMP to IAD generally means paying more. While you may find some last-minute discounts, there's no guarantee. Be flexible with your travel plans to maximize your chances of snagging a bargain.
Is it cheaper to book a GMP to IAD flight and hotel package?
Booking a GMP to IAD flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Choose from our extensive range of hotels and then add activities, car rentals and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Gimpo Intl. Airport (GMP) to Washington Dulles Intl. Airport (IAD)?
Typically, you're able to reschedule or cancel your GMP to IAD flight. However, additional fees may apply, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's rules and fees on flight changes, or if you need more information, head to our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.