$436 Cheap Flights from St. Louis (STL) to Seoul (GMP)

View $436 flight on Tue, Nov 18, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Gimpo Intl. Airport (GMP)

  • 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 St. Louis to Seoul (STL-GMP)

Prices were available within the past 7 days and start at $436 for one-way flights and $881 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Japan Airlines
Tue, Jan 6 - Wed, Jan 21
STL
St. Louis
GMP
Seoul
$881 Roundtrip, found 1 day ago
$881
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Tue, Jan 6 from St. Louis to Seoul, returning Wed, Jan 21, priced at $881 found 1 day ago
American Airlines
Mon, Oct 20 - Thu, Nov 6
STL
St. Louis
GMP
Seoul
$901 Roundtrip, found 2 days ago
$901
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Oct 20 from St. Louis to Seoul, returning Thu, Nov 6, priced at $901 found 2 days ago
Japan Airlines
Tue, Oct 21 - Thu, Nov 6
STL
St. Louis
GMP
Seoul
$907 Roundtrip, found 2 days ago
$907
Roundtrip
found 2 days ago
Select Japan Airlines flight, departing Tue, Oct 21 from St. Louis to Seoul, returning Thu, Nov 6, priced at $907 found 2 days ago
Japan Airlines
Mon, Dec 1 - Sat, Dec 13
STL
St. Louis
GMP
Seoul
$921 Roundtrip, found 2 days ago
$921
Roundtrip
found 2 days ago
Select Japan Airlines flight, departing Mon, Dec 1 from St. Louis to Seoul, returning Sat, Dec 13, priced at $921 found 2 days ago
American Airlines
Fri, Oct 31 - Tue, Nov 18
STL
St. Louis
GMP
Seoul
$977 Roundtrip, found 2 days ago
$977
Roundtrip
found 2 days ago
Select American Airlines flight, departing Fri, Oct 31 from St. Louis to Seoul, returning Tue, Nov 18, priced at $977 found 2 days ago
American Airlines
Wed, Nov 26 - Sat, Dec 13
STL
St. Louis
GMP
Seoul
$982 Roundtrip, found 2 days ago
$982
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Nov 26 from St. Louis to Seoul, returning Sat, Dec 13, priced at $982 found 2 days ago
Japan Airlines
Tue, Jan 6 - Sat, Jan 24
STL
St. Louis
GMP
Seoul
$995 Roundtrip, found 1 day ago
$995
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Tue, Jan 6 from St. Louis to Seoul, returning Sat, Jan 24, priced at $995 found 1 day ago
Japan Airlines
Fri, Dec 5 - Mon, Dec 22
STL
St. Louis
GMP
Seoul
$1,015 Roundtrip, found 1 day ago
$1,015
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Fri, Dec 5 from St. Louis to Seoul, returning Mon, Dec 22, priced at $1,015 found 1 day ago
Japan Airlines
Wed, Dec 10 - Sat, Dec 13
STL
St. Louis
GMP
Seoul
$1,017 Roundtrip, found 5 days ago
$1,017
Roundtrip
found 5 days ago
Select Japan Airlines flight, departing Wed, Dec 10 from St. Louis to Seoul, returning Sat, Dec 13, priced at $1,017 found 5 days ago
All Nippon Airways
Sun, Nov 16 - Wed, Nov 26
STL
St. Louis
GMP
Seoul
$1,968 Roundtrip, found 14 hours ago
$1,968
Roundtrip
found 14 hours ago
Select All Nippon Airways flight, departing Sun, Nov 16 from St. Louis to Seoul, returning Wed, Nov 26, priced at $1,968 found 14 hours ago

Alternative airports near Seoul

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

Select flight to Incheon Intl. ICN. Cheapest option available. Average driving time to city center is 47 minutes. Flights from $1,138
ICN
Incheon Intl.
Cheapest
Average driving time to city center47 min
Flights from $1,138

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP) cost?
Get a cheap one-way flight from $436 or cheap return flight from $881 from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP)?
January is the cheapest month to fly from STL to GMP. Planning your trip for the off-season is often the key to scoring lower fares.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP)?
To find the cheapest airline flying from STL to GMP, use Expedia's filter tool. Customize your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to GMP?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can vary 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 Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP)?
Choose a flight from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures later than this are on average 22% more likely to be 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 Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP) last-minute?
Waiting until right before your break to book a flight from STL to GMP often results in higher prices. Although you may find some last-minute discounts, they're not always guaranteed. Keep your travel plans flexible for a better chance of snagging a bargain.
Is it cheaper to book a STL to GMP flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to GMP flight and hotel package with Expedia could result in significant savings. What's more, having everything in one convenient place will take the hassle out of planning your trip. Simply pick your flights and select from our extensive range of hotels, then tailor your trip with other add-ons like activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Gimpo Intl. Airport (GMP)?
In most instances, you're able to reschedule or cancel your STL to GMP flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need more details, go to our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Gimpo Intl.
Airlines serving
All Nippon Airways, Japan Airlines
Roundtrip price
$881
Distance
6659 mi

Book with confidence

Book with confidence

St. Louis to Seoul Flights

The cheapest times to fly from St. Louis to Seoul

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 St. Louis to Seoul are during the month of January. You can find some of the cheapest flights from St. Louis to Seoul with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Seoul

Sunday is one of the best days to book for cheap flights from St. Louis to Seoul: 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 St. Louis to Seoul

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 St. Louis to Seoul in 2025. You can also book with separate airlines for your outbound and return journeys, from $436 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 St. Louis to Seoul 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 St. Louis to Seoul 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.

 

St. Louis to Seoul Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.