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Cheap flights from St. Louis to Seoul from $639

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 5/18. 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.
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m
1 stop
Multiple Airlines Logo
7:05 pm - 3:24 pm
ICN
-
STL
34h 19m
1 stop
$730Multiple Airlines
Thu, Apr 2 - Wed, Apr 8
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m
1 stop
Multiple Airlines Logo
7:05 pm - 3:24 pm
ICN
-
STL
34h 19m
1 stop
$732Multiple Airlines
Mon, Apr 13 - Wed, Apr 22
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m
1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m
1 stop
$738Multiple Airlines
Sun, Mar 8 - Sun, Mar 15
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
20h 35m
1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
18h 24m
1 stop
$767Multiple Airlines
Sun, Feb 22 - Sun, Mar 1
American Airlines Logo
5:12 am - 3:55 pm
STL
-
ICN
20h 43m
1 stop
American Airlines Logo
5:55 pm - 8:35 am
ICN
-
STL
28h 40m
2 stops
$838American Airlines
Tue, Mar 10 - Tue, Mar 17
Delta Logo
1:11 pm - 4:00 am
STL
-
ICN
24h 49m
1 stop
Delta Logo
10:15 am - 8:38 pm
ICN
-
STL
24h 23m
1 stop
$847Delta
Sat, Apr 25 - Wed, May 6
United Airlines Logo
2:40 pm - 4:20 am
STL
-
ICN
23h 40m
2 stops
United Airlines Logo
4:50 pm - 5:47 am
ICN
-
STL
26h 57m
1 stop
$851United Airlines
Sat, Apr 25 - Wed, May 6
American Airlines Logo
6:50 pm - 4:45 pm
STL
-
ICN
30h 55m
1 stop
American Airlines Logo
7:15 pm - 8:35 am
ICN
-
STL
28h 20m
2 stops
$857American Airlines
Sun, Feb 22 - Sun, Mar 1
Japan Airlines Logo
7:05 am - 10:45 am
STL
-
GMP
37h 40m
2 stops
Japan Airlines Logo
7:55 am - 10:14 pm
GMP
-
STL
28h 19m
2 stops
$912Japan Airlines
Thu, Apr 16 - Wed, Apr 22
Japan Airlines Logo
6:20 am - 9:50 pm
STL
-
GMP
25h 30m
2 stops
Japan Airlines Logo
7:55 am - 1:59 pm
GMP
-
STL
20h 04m
2 stops
$1,154Japan Airlines
Tue, Apr 14 - Tue, Apr 21

American Airlines flights from St. Louis to Seoul

Our best American Airlines deals on St. Louis to Seoul flight tickets
American Airlines
Mar 10
STL5:12 amLambert-St Louis
20h 43m
1 stop
ICN3:55 pmIncheon Intl
Mar 17
ICN5:55 pmIncheon Intl
28h 40m
2 stops
STL8:35 amLambert-St Louis
$838
American Airlines
Feb 22
STL6:50 pmLambert-St Louis
30h 55m
1 stop
ICN4:45 pmIncheon Intl
Mar 1
ICN7:15 pmIncheon Intl
28h 20m
2 stops
STL8:35 amLambert-St Louis
$857
American Airlines
Apr 2
STL5:12 amLambert-St Louis
20h 33m
1 stop
ICN3:45 pmIncheon Intl
Apr 8
ICN5:40 pmIncheon Intl
19h 24m
1 stop
STL11:04 pmLambert-St Louis
$897

United Airlines flights from St. Louis to Seoul

Our best United Airlines deals on St. Louis to Seoul flight tickets
United Airlines
Jan 25
STL5:00 pmLambert-St Louis
21h 40m
1 stop
ICN5:40 amIncheon Intl
Jan 29
ICN12:45 pmIncheon Intl
17h 52m
1 stop
STL3:37 pmLambert-St Louis
$846
United Airlines
Apr 25
STL7:05 pmLambert-St Louis
19h 15m
1 stop
ICN4:20 amIncheon Intl
May 6
ICN4:50 pmIncheon Intl
26h 57m
1 stop
STL5:47 amLambert-St Louis
$847
United Airlines
Apr 25
STL3:15 pmLambert-St Louis
23h 05m
2 stops
ICN4:20 amIncheon Intl
May 6
ICN4:50 pmIncheon Intl
26h 57m
1 stop
STL5:47 amLambert-St Louis
$851

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 January 24, 2026.
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

Thu 4/2

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Wed 4/8

7:05 pm-3:24 pm

1 stop34h 19m

$730

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 4/13

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Wed 4/22

7:05 pm-3:24 pm

1 stop34h 19m

$732

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 3/8

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Sun 3/15

8:35 pm-11:59 pm

1 stop17h 24m

$738

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/22

7:00 am-6:35 pm

1 stop20h 35m

Incheon Intl

Sun 3/1

8:35 pm-11:59 pm

1 stop18h 24m

$767

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 3/10

5:12 am-3:55 pm

1 stop20h 43m

Incheon Intl

Tue 3/17

5:55 pm-8:35 am

2 stops28h 40m

$838

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/25

1:11 pm-4:00 am

1 stop24h 49m

Incheon Intl

Wed 5/6

10:15 am-8:38 pm

1 stop24h 23m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/25

2:40 pm-4:20 am

2 stops23h 40m

Incheon Intl

Wed 5/6

4:50 pm-5:47 am

1 stop26h 57m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/22

6:50 pm-4:45 pm

1 stop30h 55m

Incheon Intl

Sun 3/1

7:15 pm-8:35 am

2 stops28h 20m

$857

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Thu 4/16

7:05 am-10:45 am

2 stops37h 40m

Seoul Gimpo Intl

Wed 4/22

7:55 am-10:14 pm

2 stops28h 19m

$912

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 4/14

6:20 am-9:50 pm

2 stops25h 30m

Seoul Gimpo Intl

Tue 4/21

7:55 am-1:59 pm

2 stops20h 04m

$1,154

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
1
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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 January is another great option to travel to Seoul, with average flight prices from St. Louis averaging around $866.

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 $1,098 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 $1,048 on momondo.

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

You could potentially save up to 13% 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

19h 40m

Direct flights

None
The fastest flight from St. Louis to Seoul takes 19h 40m
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. 19h 40m 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
10,652 reviews
Search Air Canada flights
American AirlinesPriceFrom $846Free CancellationRating
7.2
11,193 reviews
Search American Airlines flights
DeltaPriceFrom $846Free CancellationRating
7.9
8,110 reviews
Search Delta flights
United AirlinesPriceFrom $870Free CancellationRating
7.4
9,194 reviews
Search United Airlines 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.

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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