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Cheap flights from St. Louis to Seoul from $383

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 1/30. 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
6:00 am - 3:50 pm
STL
-
ICN
18h 50m1 stop
Delta Logo
7:25 pm - 11:37 pm
ICN
-
STL
19h 12m1 stop
$746Delta
Wed, Jan 21 - Tue, Jan 27
Delta Logo
9:59 am - 5:45 am
STL
-
ICN
28h 46m1 stop
Delta Logo
9:35 am - 4:07 pm
ICN
-
STL
21h 32m2 stops
$750Delta
Wed, Jan 21 - Tue, Jan 27
Alaska Airlines Logo
6:19 pm - 6:35 pm
STL
-
ICN
33h 16m1 stop
Alaska Airlines Logo
8:35 pm - 1:54 pm
ICN
-
STL
32h 19m1 stop
$758Alaska Airlines
Sat, Jan 24 - Sat, Jan 31
United Airlines Logo
5:25 pm - 5:40 am
STL
-
ICN
21h 15m1 stop
United Airlines Logo
12:45 pm - 4:44 pm
ICN
-
STL
18h 59m1 stop
$846United Airlines
Sun, Feb 15 - Thu, Feb 19
United Airlines Logo
3:15 pm - 5:40 am
STL
-
ICN
23h 25m2 stops
United Airlines Logo
12:45 pm - 4:44 pm
ICN
-
STL
18h 59m1 stop
$850United Airlines
Sun, Feb 15 - Thu, Feb 19
Japan Airlines Logo
7:04 am - 10:05 pm
STL
-
GMP
24h 01m2 stops
Japan Airlines Logo
12:05 pm - 11:59 pm
GMP
-
STL
26h 54m2 stops
$856Japan Airlines
Wed, Jan 21 - Tue, Jan 27
Delta Logo
1:00 pm - 5:00 am
STL
-
ICN
26h 00m1 stop
Delta Logo
4:25 pm - 11:42 pm
ICN
-
STL
21h 17m1 stop
$866Delta
Wed, Mar 25 - Sun, Apr 5
Delta Logo
6:10 am - 4:30 pm
STL
-
ICN
20h 20m2 stops
Delta Logo
7:20 pm - 11:15 pm
ICN
-
STL
17h 55m2 stops
$870Delta
Sun, Mar 29 - Mon, Apr 6
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
$882Multiple Airlines
Fri, Mar 27 - Mon, Apr 6
Japan Airlines Logo
7:00 am - 10:05 pm
STL
-
GMP
25h 05m2 stops
Japan Airlines Logo
8:00 am - 6:03 pm
GMP
-
STL
24h 03m2 stops
$920Japan Airlines
Mon, Mar 9 - Fri, Mar 13

United Airlines flights from St. Louis to Seoul

Our best United Airlines deals on St. Louis to Seoul flight tickets
United Airlines
Feb 15
STL5:25 pmLambert-St Louis
21h 15m
1 stop
ICN5:40 amIncheon Intl
Feb 19
ICN12:45 pmIncheon Intl
18h 59m
1 stop
STL4:44 pmLambert-St Louis
$846
Find similar
United Airlines
Feb 15
STL1:11 pmLambert-St Louis
25h 29m
2 stops
ICN5:40 amIncheon Intl
Feb 19
ICN12:45 pmIncheon Intl
22h 41m
2 stops
STL8:26 pmLambert-St Louis
$850
Find similar
United Airlines
Mar 11
STL6:51 amLambert-St Louis
31h 49m
1 stop
ICN4:40 amIncheon Intl
Mar 23
ICN5:00 pmIncheon Intl
30h 21m
2 stops
STL9:21 amLambert-St Louis
$877
Find similar

Korean Air flights from St. Louis to Seoul

Our best Korean Air deals on St. Louis to Seoul flight tickets
Korean Air
Dec 13
STL6:00 amLambert-St Louis
18h 30m
1 stop
ICN3:30 pmIncheon Intl
Dec 19
ICN7:30 pmIncheon Intl
18h 57m
1 stop
STL11:27 pmLambert-St Louis
$2,365
Find similar
Korean Air
Dec 20
STL6:05 amLambert-St Louis
18h 25m
1 stop
ICN3:30 pmIncheon Intl
Dec 23
ICN7:30 pmIncheon Intl
17h 46m
1 stop
STL10:16 pmLambert-St Louis
$3,010
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Seoul 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 11, 2025.
Use the filters below to find and compare flights from St. Louis to Seoul that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 1/21

6:00 am-3:50 pm

1 stop18h 50m

Incheon Intl

Tue 1/27

7:25 pm-11:37 pm

1 stop19h 12m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 1/21

9:59 am-5:45 am

1 stop28h 46m

Incheon Intl

Tue 1/27

9:35 am-4:07 pm

2 stops21h 32m

$750

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 1/24

6:19 pm-6:35 pm

1 stop33h 16m

Incheon Intl

Sat 1/31

8:35 pm-1:54 pm

1 stop32h 19m

$758

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/15

5:25 pm-5:40 am

1 stop21h 15m

Incheon Intl

Thu 2/19

12:45 pm-4:44 pm

1 stop18h 59m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/15

3:15 pm-5:40 am

2 stops23h 25m

Incheon Intl

Thu 2/19

12:45 pm-4:44 pm

1 stop18h 59m

$850

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 1/21

7:04 am-10:05 pm

2 stops24h 01m

Seoul Gimpo Intl

Tue 1/27

12:05 pm-11:59 pm

2 stops26h 54m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 3/25

1:00 pm-5:00 am

1 stop26h 00m

Incheon Intl

Sun 4/5

4:25 pm-11:42 pm

1 stop21h 17m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 3/29

6:10 am-4:30 pm

2 stops20h 20m

Incheon Intl

Mon 4/6

7:20 pm-11:15 pm

2 stops17h 55m

$870

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 3/27

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Mon 4/6

8:35 pm-11:55 pm

1 stop17h 20m

$882

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Mon 3/9

7:00 am-10:05 pm

2 stops25h 05m

Seoul Gimpo Intl

Fri 3/13

8:00 am-6:03 pm

2 stops24h 03m

$920

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 Seoul

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 typical price of a round-trip flight between St. Louis and Seoul?

What is the cheapest month to fly to Seoul?

The month of September is another great option to travel to Seoul, with average flight prices from St. Louis averaging around $875.

What is the cheapest day to depart on your flight to Seoul?

According to our data, Tuesday is the cheapest day to fly to Seoul from St. Louis. The lowest ticket price found for a Tuesday departure recently was $1,367. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Seoul is Sunday, with ticket prices averaging around $1,713.

What is the cheapest time of day to depart on your flight to Seoul?

Flying to Seoul from St. Louis in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $1,290 when looking at flights departing in the afternoon. In the evening is when there is more demand to fly to Seoul, so prices are often more expensive at around $1,673 per ticket.

How far in advance should I book a flight to Seoul?

You are more likely to see cheaper flights to Seoul from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Seoul for around $1,120 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seoul from St. Louis for as low as $1,065 on momondo.

Can stopping save me money on St. Louis to Seoul flights?

You could potentially save up to 7% on your flight if you consider stops on a St. Louis to Seoul flight.

When to book flights from St. Louis to Seoul

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

Cheap St. Louis to Seoul (STL to SEL) flight deals and tips

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

Fastest flight time

20h 20m

Direct flights

None
The fastest flight from St. Louis to Seoul takes 20h 20m
There are no direct flights from St. Louis to Seoul. There are no popular flight routes from St. Louis to Seoul.
Search flight deals

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

    The distance between Lambert-St Louis and Seoul is about 6661.9 mi. 20h 20m is a normal flight duration for this route.

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

    Prices for flights from Lambert-St Louis Airport to Seoul are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Seoul.

  • What documentation or ID do you need to fly to Seoul?

    The required travel and health documents for your Seoul trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seoul. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from St. Louis to Seoul?

Best airlines flying from St. Louis to Seoul

Compare and see reviews for airlines that fly from St. Louis to Seoul with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $799Free CancellationRating
7.1
10,516 reviews
Search Air Canada flights
American AirlinesPriceFrom $846Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
DeltaPriceFrom $846Free CancellationRating
7.9
8,007 reviews
Search Delta flights
United AirlinesPriceFrom $870Free CancellationRating
7.4
9,095 reviews
Search United Airlines flights
Korean AirPriceFrom $999Free CancellationRating
8.4
1,184 reviews
Search Korean Air flights

Why use momondo?

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

Finding the right flight to Seoul from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seoul quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Seoul from St. Louis which offer a flexible booking policy as well as other useful filters and features.

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

momondo provides multiple filters to help you find the best flight to Seoul from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Price alerts on flights to Seoul from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Seoul trip

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Find better results for your trip to South Korea

Fly into one of these airports located in Seoul

Airports listed have a maximum distance of 30.3 mi from Seoul
Seoul Gimpo Intl Airport
Incheon Intl Airport