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Cheap flights from St. Louis to Seoul from $344

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Seoul departing on 3/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Seoul

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:35 am - 4:50 pm
STL
-
ICN
19h 15m1 stop
Delta Logo
7:40 pm - 9:38 pm
ICN
-
STL
16h 58m1 stop
$646Delta
Fri, Jan 16 - Fri, Jan 23
Delta Logo
6:55 pm - 3:30 pm
STL
-
ICN
29h 35m2 stops
Delta Logo
7:30 pm - 11:37 pm
ICN
-
STL
19h 07m2 stops
$650Delta
Fri, Jan 16 - Fri, Jan 23
Multiple Airlines Logo
2:55 pm - 6:35 pm
STL
-
ICN
37h 40m1 stop
Multiple Airlines Logo
8:35 pm - 11:55 pm
ICN
-
STL
17h 20m1 stop
$651Multiple Airlines
Sat, Mar 28 - Wed, Apr 8
Multiple Airlines Logo
6:19 pm - 6:35 pm
STL
-
ICN
33h 16m1 stop
Multiple Airlines Logo
8:35 pm - 1:54 pm
ICN
-
STL
32h 19m1 stop
$656Multiple Airlines
Sat, Jan 31 - Sat, Feb 7
Multiple Airlines Logo
2:55 pm - 6:35 pm
STL
-
ICN
37h 40m1 stop
Multiple Airlines Logo
8:35 pm - 11:55 pm
ICN
-
STL
17h 20m1 stop
$660Multiple Airlines
Sat, Mar 28 - Mon, Apr 6
United Airlines Logo
5:00 pm - 5:40 am
STL
-
ICN
21h 40m1 stop
United Airlines Logo
12:45 pm - 3:37 pm
ICN
-
STL
17h 52m1 stop
$746United Airlines
Sun, Feb 1 - Thu, Feb 5
United Airlines Logo
9:57 am - 5:40 am
STL
-
ICN
28h 43m2 stops
United Airlines Logo
12:45 pm - 3:37 pm
ICN
-
STL
17h 52m1 stop
$750United Airlines
Sun, Feb 1 - Thu, Feb 5
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m1 stop
Multiple Airlines Logo
8:35 pm - 11:55 pm
ICN
-
STL
17h 20m1 stop
$831Multiple Airlines
Wed, Mar 25 - Thu, Apr 9
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m1 stop
Multiple Airlines Logo
8:35 pm - 11:55 pm
ICN
-
STL
17h 20m1 stop
$832Multiple Airlines
Thu, Mar 26 - Mon, Apr 6
Multiple Airlines Logo
2:55 pm - 6:35 pm
STL
-
ICN
37h 40m1 stop
Multiple Airlines Logo
8:35 pm - 11:55 pm
ICN
-
STL
17h 20m1 stop
$837Multiple Airlines
Sat, Mar 28 - Thu, Apr 9

United Airlines flights from St. Louis to Incheon Intl Airport

Our best United Airlines deals on St. Louis to Incheon Intl Airport flight tickets
United Airlines
Feb 1
STL5:00 pmLambert-St Louis
21h 40m
1 stop
ICN5:40 amIncheon Intl
Feb 5
ICN12:45 pmIncheon Intl
17h 52m
1 stop
STL3:37 pmLambert-St Louis
$746
Find similar
United Airlines
Feb 1
STL9:57 amLambert-St Louis
28h 43m
2 stops
ICN5:40 amIncheon Intl
Feb 5
ICN12:45 pmIncheon Intl
17h 52m
1 stop
STL3:37 pmLambert-St Louis
$750
Find similar
United Airlines
Jan 13
STL5:00 pmLambert-St Louis
21h 40m
1 stop
ICN5:40 amIncheon Intl
Jan 20
ICN12:45 pmIncheon Intl
17h 52m
1 stop
STL3:37 pmLambert-St Louis
$846
Find similar

Delta flights from St. Louis to Incheon Intl Airport

Our best Delta deals on St. Louis to Incheon Intl Airport flight tickets
Delta
Jan 16
STL6:35 amLambert-St Louis
19h 15m
1 stop
ICN4:50 pmIncheon Intl
Jan 23
ICN7:40 pmIncheon Intl
16h 58m
1 stop
STL9:38 pmLambert-St Louis
$646
Find similar
Delta
Jan 16
STL6:55 pmLambert-St Louis
29h 35m
2 stops
ICN3:30 pmIncheon Intl
Jan 23
ICN7:30 pmIncheon Intl
19h 07m
2 stops
STL11:37 pmLambert-St Louis
$650
Find similar
Delta
Mar 28
STL5:00 pmLambert-St Louis
21h 00m
1 stop
ICN4:00 amIncheon Intl
Apr 9
ICN7:00 pmIncheon Intl
18h 15m
2 stops
STL11:15 pmLambert-St Louis
$870
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Incheon Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from St. Louis to Incheon Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 1/16

6:35 am-4:50 pm

1 stop19h 15m

Incheon Intl

Fri 1/23

7:40 pm-9:38 pm

1 stop16h 58m

$646

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 1/16

6:55 pm-3:30 pm

2 stops29h 35m

Incheon Intl

Fri 1/23

7:30 pm-11:37 pm

2 stops19h 07m

$650

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 3/28

2:55 pm-6:35 pm

1 stop37h 40m

Incheon Intl

Wed 4/8

8:35 pm-11:55 pm

1 stop17h 20m

$651

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 1/31

6:19 pm-6:35 pm

1 stop33h 16m

Incheon Intl

Sat 2/7

8:35 pm-1:54 pm

1 stop32h 19m

$656

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 3/28

2:55 pm-6:35 pm

1 stop37h 40m

Incheon Intl

Mon 4/6

8:35 pm-11:55 pm

1 stop17h 20m

$660

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/1

5:00 pm-5:40 am

1 stop21h 40m

Incheon Intl

Thu 2/5

12:45 pm-3:37 pm

1 stop17h 52m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/1

9:57 am-5:40 am

2 stops28h 43m

Incheon Intl

Thu 2/5

12:45 pm-3:37 pm

1 stop17h 52m

$750

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 3/25

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Thu 4/9

8:35 pm-11:55 pm

1 stop17h 20m

$831

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 3/26

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Mon 4/6

8:35 pm-11:55 pm

1 stop17h 20m

$832

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 3/28

2:55 pm-6:35 pm

1 stop37h 40m

Incheon Intl

Thu 4/9

8:35 pm-11:55 pm

1 stop17h 20m

$837

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seoul from

How to get the cheapest flight ticket from St. Louis to Incheon Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Incheon Intl Airport?

The cheapest month to fly to Incheon Intl Airport from St. Louis is in January. Flight prices, which tend to average around $799, are often lower during this time because this is during the off-season. If you are unable to visit Incheon Intl Airport during the month of January, then departing from St. Louis during the month December is also very affordable. Most momondo users find prices during this month for around $846.

What is the cheapest day to depart on your flight to Incheon Intl Airport?

The cheapest day to depart from St. Louis to Incheon Intl Airport is on a Wednesday when prices can be found for as low as $1,462. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,782. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

What is the cheapest time of day to depart on your flight to Incheon Intl Airport?

In the afternoon is the cheapest time of day to fly from St. Louis to Incheon Intl Airport when you can find flight prices for as low as $1,485. Flying to Incheon Intl Airport in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,718 on average. Flights to Incheon Intl Airport from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Incheon Intl Airport?

You are more likely to see cheaper flights to Incheon Intl Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Incheon Intl Airport for around $1,121 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Incheon Intl Airport from St. Louis for as low as $1,065 on momondo.

When to book flights from St. Louis to Incheon Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Incheon Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Incheon Intl Airport (STL to ICN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Incheon Intl Airport

Fastest flight time

17h 50m

Direct flights

None
The fastest flight from St. Louis to Incheon Intl Airport takes 17h 50m
There are no direct flights from St. Louis to Incheon Intl Airport. There are no popular flight routes from St. Louis to Incheon Intl Airport.
Search flight deals

  • How far is Lambert-St Louis to Incheon Intl by plane?

    The straight-line distance from Lambert-St Louis to Incheon Intl is 6682.0 mi. By plane, this route typically takes 17h 50m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Incheon Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Incheon Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Incheon Intl Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Incheon Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Incheon Intl Airport.

  • What documentation or ID do you need to fly to Incheon Intl Airport?

    The travel and health documents required for your trip to Incheon Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Incheon Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Incheon Intl Airport?

Best airlines flying from St. Louis to Incheon Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Incheon Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $799Free CancellationRating
7.1
10,534 reviews
Search Air Canada flights
American AirlinesPriceFrom $846Free CancellationRating
7.2
11,055 reviews
Search American Airlines flights
DeltaPriceFrom $846Free CancellationRating
7.9
8,008 reviews
Search Delta flights
United AirlinesPriceFrom $870Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
Korean AirPriceFrom $999Free CancellationRating
8.4
1,186 reviews
Search Korean Air flights

Traveling to a place near Seoul?

Book flights to Seoul if you plan to visit one of these locations
Suwon
Seongnam
Daejeon
Anyang

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Seoul?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Seoul. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Seoul with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Seoul flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Seoul?

Once you have performed a search for St. Louis to Seoul flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Seoul right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Seoul now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seoul and let you know when they change.

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