$433 Cheap United flights St. Louis (STL) to Seoul (ICN)

View $433 flight on Fri, Oct 24, 2025Opens in a new window

$433 Cheap United flights St. Louis (STL) to Seoul (ICN)

Prices were available within the past 7 days and start at $433 for one-way flights and $837 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Oct 21 - Tue, Nov 4
STL
St. Louis
ICN
Seoul
$837 Roundtrip, found 3 days ago
$837
Roundtrip
found 3 days ago
Select United flight, departing Tue, Oct 21 from St. Louis to Seoul, returning Tue, Nov 4, priced at $837 found 3 days ago
United
Fri, Oct 24 - Sat, Jan 24
STL
St. Louis
ICN
Seoul
$861 Roundtrip, found 3 hours ago
$861
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Oct 24 from St. Louis to Seoul, returning Sat, Jan 24, priced at $861 found 3 hours ago
United
Thu, Oct 2 - Wed, Oct 8
STL
St. Louis
ICN
Seoul
$866 Roundtrip, found 7 hours ago
$866
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Oct 2 from St. Louis to Seoul, returning Wed, Oct 8, priced at $866 found 7 hours ago
United
Sat, Dec 6 - Tue, Dec 16
STL
St. Louis
ICN
Seoul
$866 Roundtrip, found 1 hour ago
$866
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Dec 6 from St. Louis to Seoul, returning Tue, Dec 16, priced at $866 found 1 hour ago
United
Sat, Dec 6 - Tue, Dec 16
STL
St. Louis
ICN
Seoul
$871 Roundtrip, found 1 hour ago
$871
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Dec 6 from St. Louis to Seoul, returning Tue, Dec 16, priced at $871 found 1 hour ago
United
Mon, Oct 6 - Mon, Oct 13
STL
St. Louis
ICN
Seoul
$873 Roundtrip, found 22 hours ago
$873
Roundtrip
found 22 hours ago
Select United flight, departing Mon, Oct 6 from St. Louis to Seoul, returning Mon, Oct 13, priced at $873 found 22 hours ago
Flights from St. Louis (STL) to Seoul (ICN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Incheon Intl.
Airlines serving
Air Canada, Alaska Airlines, American Airlines, Cathay Pacific, Delta, Hawaiian Airlines, Korean Air, United
Popular airline
Delta
Distance
6674 mi

Frequently asked questions

How much is a United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN)?
You can discover cheap return United Airlines flights from $837 from STL to ICN by organizing your results from "Price (lowest to highest)" on Expedia. Or search for options from $433 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from STL to ICN with United Airlines?
United Airlines flights to Seoul are often cheaper in the quieter months of January and February. Whether you're after a return or one-way ticket, you could score a better deal then.
What is the cheapest time to book flights from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN) with United Airlines?
To discover cheap flights from STL to ICN with United Airlines, begin your search about one month before your planned departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another useful tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN)?
Click on the "Nonstop" filter when browsing for direct United Airlines flights from STL to ICN. You'll also be able to compare other airlines offering the same nonstop route.
What is the earliest United Airlines flight from STL to ICN?
To find the earliest departures from STL to ICN with United Airlines, sort your results by "Early Morning" and "Morning." Choosing an early flight generally means you'll experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Seoul?
Get on a United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Seoul, and you're most likely to touch down at Incheon Intl. Airport (ICN). This is the airline's main hub in this city.
Why fly with United Airlines from STL to ICN?
With a rewarding loyalty program, United Airlines is a top choice for many passengers flying from STL to ICN. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights along with your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Incheon Intl. Airport (ICN)?
Depending on the ticket type you purchased, a fee is typically charged if you cancel or change your booking more than 24 hours after it's been confirmed. To secure plane tickets with more flexibility, select our "Changes included" and "No cancel fee" boxes when you search for flights. For additional information on changing or canceling your reservation, head to "Trips," select your flight and tick "Manage Booking."

Explore a world of travel with Expedia

*Available to One Key members.