$369 Cheap Flights from St. Louis (STL) to Seoul (ICN)

View $369 flight on Thu, Apr 9, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Incheon Intl. Airport (ICN)

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

Prices were available within the past 7 days and start at $369 for one-way flights and $746 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Mar 30 - Fri, Apr 10
STL
St. Louis
ICN
Seoul
$746 Roundtrip, found 7 hours ago
$746
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Mon, Mar 30 from St. Louis to Seoul, returning Fri, Apr 10, priced at $746 found 7 hours ago
Alaska Airlines
Tue, Feb 24 - Thu, Feb 26
STL
St. Louis
ICN
Seoul
$753 Roundtrip, found 3 hours ago
$753
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Tue, Feb 24 from St. Louis to Seoul, returning Thu, Feb 26, priced at $753 found 3 hours ago
Alaska Airlines
Wed, Mar 25 - Wed, Apr 8
STL
St. Louis
ICN
Seoul
$756 Roundtrip, found 4 days ago
$756
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Mar 25 from St. Louis to Seoul, returning Wed, Apr 8, priced at $756 found 4 days ago
Alaska Airlines
Fri, Mar 20 - Thu, Mar 26
STL
St. Louis
ICN
Seoul
$756 Roundtrip, found 5 days ago
$756
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Mar 20 from St. Louis to Seoul, returning Thu, Mar 26, priced at $756 found 5 days ago
Alaska Airlines
Tue, Feb 24 - Thu, Feb 26
STL
St. Louis
ICN
Seoul
$759 Roundtrip, found 3 hours ago
$759
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Tue, Feb 24 from St. Louis to Seoul, returning Thu, Feb 26, priced at $759 found 3 hours ago
Alaska Airlines
Wed, Mar 25 - Wed, Apr 8
STL
St. Louis
ICN
Seoul
$762 Roundtrip, found 4 days ago
$762
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Mar 25 from St. Louis to Seoul, returning Wed, Apr 8, priced at $762 found 4 days ago
American Airlines
Sun, Nov 16 - Fri, Nov 21
STL
St. Louis
ICN
Seoul
$846 Roundtrip, found 4 hours ago
$846
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Sun, Nov 16 from St. Louis to Seoul, returning Fri, Nov 21, priced at $846 found 4 hours ago
Delta
Mon, Nov 24 - Wed, Nov 26
STL
St. Louis
ICN
Seoul
$846 Roundtrip, found 4 hours ago
$846
Roundtrip
found 4 hours ago
Select Delta flight, departing Mon, Nov 24 from St. Louis to Seoul, returning Wed, Nov 26, priced at $846 found 4 hours ago
Hawaiian Airlines
Wed, Oct 22 - Fri, Nov 7
STL
St. Louis
ICN
Seoul
$846 Roundtrip, found 1 day ago
$846
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Wed, Oct 22 from St. Louis to Seoul, returning Fri, Nov 7, priced at $846 found 1 day ago
United
Sat, Feb 14 - Thu, Feb 19
STL
St. Louis
ICN
Seoul
$846 Roundtrip, found 11 hours ago
$846
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Feb 14 from St. Louis to Seoul, returning Thu, Feb 19, priced at $846 found 11 hours ago

Find the cheapest month to fly from St. Louis (STL) to Seoul (ICN)

September is typically the cheapest month to fly

From $762 - $1,300 per traveler.

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 $861
ICN
Incheon Intl.
Cheapest
Average driving time to city center47 min
Flights from $861

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN) cost?
Secure a cheap one-way flight from $369 or cheap return flight from $746 from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN)?
March is the most affordable month to fly from STL to ICN. 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 Incheon Intl. Airport (ICN)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest STL to ICN flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN)?
There aren't any daily direct flights from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN). But you can choose flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from STL to ICN?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*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 Incheon Intl. Airport (ICN)?
Opt for a flight from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN) that takes off before 3 PM to reduce the likelihood of delays. Departures after this hour 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 Incheon Intl. Airport (ICN) last-minute?
Last-minute fares from STL to ICN are generally more expensive. To lock in the cheapest rates, start looking for flights as early as possible. That said, if your travel plans are flexible, you may find a cheap ticket right before you leave.
Is it cheaper to book a STL to ICN flight and hotel package?
Opting for a STL to ICN flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Select from our extensive range of accommodations and then add flights, car rentals and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN)?
In most cases, you can cancel or modify your STL to ICN flight. However, additional fees may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you'd like further information, visit our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Incheon Intl.
Airlines serving
Air Canada, Alaska Airlines, All Nippon Airways, American Airlines, Cathay Pacific, Delta, Hawaiian Airlines, Korean Air, United
Roundtrip price
$746
Distance
6674 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 March. 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 $369 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.