$486 Cheap Flights from Seoul (ICN) to St. Louis (STL)

View $486 flight on Fri, Oct 24, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $486 for one-way flights and $631 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, Oct 27 - Mon, Nov 3
ICN
Seoul
STL
St. Louis
$631 Roundtrip, found 2 days ago
$631
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Oct 27 from Seoul to St. Louis, returning Mon, Nov 3, priced at $631 found 2 days ago
Delta
Mon, Oct 27 - Tue, Nov 11
ICN
Seoul
STL
St. Louis
$633 Roundtrip, found 3 hours ago
$633
Roundtrip
found 3 hours ago
Select Delta flight, departing Mon, Oct 27 from Seoul to St. Louis, returning Tue, Nov 11, priced at $633 found 3 hours ago
Delta
Tue, Apr 7 - Sun, Apr 12
ICN
Seoul
STL
St. Louis
$634 Roundtrip, found 6 days ago
$634
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Apr 7 from Seoul to St. Louis, returning Sun, Apr 12, priced at $634 found 6 days ago
American Airlines
Thu, Nov 13 - Sun, Nov 16
ICN
Seoul
STL
St. Louis
$636 Roundtrip, found 2 days ago
$636
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Nov 13 from Seoul to St. Louis, returning Sun, Nov 16, priced at $636 found 2 days ago
Delta
Mon, Oct 27 - Tue, Nov 11
ICN
Seoul
STL
St. Louis
$639 Roundtrip, found 3 hours ago
$639
Roundtrip
found 3 hours ago
Select Delta flight, departing Mon, Oct 27 from Seoul to St. Louis, returning Tue, Nov 11, priced at $639 found 3 hours ago
Delta
Tue, Apr 7 - Wed, Apr 8
ICN
Seoul
STL
St. Louis
$640 Roundtrip, found 5 hours ago
$640
Roundtrip
found 5 hours ago
Select Delta flight, departing Tue, Apr 7 from Seoul to St. Louis, returning Wed, Apr 8, priced at $640 found 5 hours ago
American Airlines
Thu, Nov 13 - Sun, Nov 16
ICN
Seoul
STL
St. Louis
$642 Roundtrip, found 2 days ago
$642
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Nov 13 from Seoul to St. Louis, returning Sun, Nov 16, priced at $642 found 2 days ago
United
Tue, Apr 7 - Fri, Apr 17
ICN
Seoul
STL
St. Louis
$655 Roundtrip, found 6 days ago
$655
Roundtrip
found 6 days ago
Select United flight, departing Tue, Apr 7 from Seoul to St. Louis, returning Fri, Apr 17, priced at $655 found 6 days ago
Korean Air
Fri, Nov 7 - Tue, Nov 11
ICN
Seoul
STL
St. Louis
$704 Roundtrip, found 1 hour ago
$704
Roundtrip
found 1 hour ago
Select Korean Air flight, departing Fri, Nov 7 from Seoul to St. Louis, returning Tue, Nov 11, priced at $704 found 1 hour ago
Asiana Airlines
Wed, May 27 - Sat, Jun 13
ICN
Seoul
STL
St. Louis
$705 Roundtrip, found 1 day ago
$705
Roundtrip
found 1 day ago
Select Asiana Airlines flight, departing Wed, May 27 from Seoul to St. Louis, returning Sat, Jun 13, priced at $705 found 1 day ago

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

September is typically the cheapest month to fly

From $627 - $1,128 per traveler.

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $718
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $718

Frequently asked questions

How much does a flight from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL) cost?
Lock in a cheap one-way flight from $486 or cheap return flight from $631 from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL)?
October is the most affordable month to fly from ICN to STL. Traveling during an off-peak travel window is often the key to better flight prices.
What is the cheapest airline that flies from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from ICN to STL, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ICN to STL?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can vary based on a range of factors, such as the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL) route, travel before 3 PM. Departures after this hour 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 Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute fares from ICN to STL are typically more expensive. To lock in the cheapest rates, start looking for flights well in advance. That being said, if you can play around with your travel dates, you may land a cheap fare just before your departure.
Is it cheaper to book an ICN to STL flight and hotel package?
You'll typically save money by booking an ICN to STL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one place. Once you've selected your preferred flights and accommodations, consider other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Incheon Intl. Airport (ICN) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your ICN to STL flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Incheon Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, Alaska Airlines, American Airlines, Asiana Airlines, Cathay Pacific, Delta, Japan Airlines, Korean Air, Lufthansa, Qatar Airways, United
Roundtrip price
$631
Distance
6674 mi

Book with confidence

Seoul to St. Louis Flights

The cheapest times to fly from Seoul to St. Louis

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

 

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

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

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 St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $486 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 St. Louis 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 St. Louis 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.

 

Seoul to St. Louis Flights

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*Available to One Key members.