$465 Cheap Flights from St. Louis (STL) to Seoul (GMP)

View $465 flight on Mon, Aug 18, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $465 for one-way flights and $901 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Japan Airlines
Tue, Oct 14 - Tue, Oct 21
STL
St. Louis
GMP
Seoul
$901 Roundtrip, found 6 days ago
$901
Roundtrip
found 6 days ago
Select Japan Airlines flight, departing Tue, Oct 14 from St. Louis to Seoul, returning Tue, Oct 21, priced at $901 found 6 days ago
Japan Airlines
Thu, Sep 18 - Thu, Sep 25
STL
St. Louis
GMP
Seoul
$906 Roundtrip, found 1 day ago
$906
Roundtrip
found 1 day ago
Select Japan Airlines flight, departing Thu, Sep 18 from St. Louis to Seoul, returning Thu, Sep 25, priced at $906 found 1 day ago
Japan Airlines
Thu, Aug 14 - Wed, Aug 20
STL
St. Louis
GMP
Seoul
$907 Roundtrip, found 6 days ago
$907
Roundtrip
found 6 days ago
Select Japan Airlines flight, departing Thu, Aug 14 from St. Louis to Seoul, returning Wed, Aug 20, priced at $907 found 6 days ago
Japan Airlines
Sun, Aug 17 - Tue, Aug 19
STL
St. Louis
GMP
Seoul
$921 Roundtrip, found 4 days ago
$921
Roundtrip
found 4 days ago
Select Japan Airlines flight, departing Sun, Aug 17 from St. Louis to Seoul, returning Tue, Aug 19, priced at $921 found 4 days ago
Japan Airlines
Sun, Nov 16 - Wed, Nov 26
STL
St. Louis
GMP
Seoul
$950 Roundtrip, found 21 hours ago
$950
Roundtrip
found 21 hours ago
Select Japan Airlines flight, departing Sun, Nov 16 from St. Louis to Seoul, returning Wed, Nov 26, priced at $950 found 21 hours ago
Japan Airlines
Tue, Nov 11 - Thu, Nov 27
STL
St. Louis
GMP
Seoul
$950 Roundtrip, found 4 days ago
$950
Roundtrip
found 4 days ago
Select Japan Airlines flight, departing Tue, Nov 11 from St. Louis to Seoul, returning Thu, Nov 27, priced at $950 found 4 days ago
Japan Airlines
Wed, Oct 22 - Wed, Nov 26
STL
St. Louis
GMP
Seoul
$956 Roundtrip, found 4 hours ago
$956
Roundtrip
found 4 hours ago
Select Japan Airlines flight, departing Wed, Oct 22 from St. Louis to Seoul, returning Wed, Nov 26, priced at $956 found 4 hours ago
American Airlines
Mon, Sep 1 - Mon, Sep 8
STL
St. Louis
GMP
Seoul
$983 Roundtrip, found 1 hour ago
$983
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Mon, Sep 1 from St. Louis to Seoul, returning Mon, Sep 8, priced at $983 found 1 hour ago
Air Canada
Mon, Sep 1 - Tue, Sep 30
STL
St. Louis
GMP
Seoul
$997 Roundtrip, found 4 hours ago
$997
Roundtrip
found 4 hours ago
Select Air Canada flight, departing Mon, Sep 1 from St. Louis to Seoul, returning Tue, Sep 30, priced at $997 found 4 hours ago
All Nippon Airways
Mon, Apr 20 - Mon, Apr 27
STL
St. Louis
GMP
Seoul
$1,918 Roundtrip, found 20 hours ago
$1,918
Roundtrip
found 20 hours ago
Select All Nippon Airways flight, departing Mon, Apr 20 from St. Louis to Seoul, returning Mon, Apr 27, priced at $1,918 found 20 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 $866
ICN
Incheon Intl.
Cheapest
Average driving time to city center47 min
Flights from $866
Flights from St. Louis (STL) to Seoul (GMP)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Gimpo Intl.
Airlines serving
All Nippon Airways, Japan Airlines
Roundtrip price
$901
Distance
6659 mi

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 October. 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 $465 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.

 

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 $465 or cheap return flight from $901 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)?
October 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.

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*Available to One Key members.