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Cheap flights from St. Louis to Seoul from $367

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 3/8. 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 35m1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m1 stop
$745Multiple Airlines
Mon, Mar 30 - Wed, Apr 1
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m1 stop
$746Multiple Airlines
Thu, Apr 2 - Thu, Apr 16
Multiple Airlines Logo
4:20 pm - 6:35 pm
STL
-
ICN
36h 15m1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m1 stop
$752Multiple Airlines
Sun, Mar 29 - Wed, Apr 1
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m1 stop
$755Multiple Airlines
Mon, Mar 30 - Fri, Apr 3
Delta Logo
6:59 pm - 2:10 pm
STL
-
ICN
29h 11m1 stop
Delta Logo
6:50 pm - 11:58 pm
ICN
-
STL
19h 08m1 stop
$845Delta
Sun, Mar 29 - Tue, Apr 7
Delta Logo
6:10 am - 3:30 pm
STL
-
ICN
18h 20m1 stop
Delta Logo
6:00 pm - 8:37 pm
ICN
-
STL
17h 37m1 stop
$846Delta
Sun, Jan 11 - Wed, Jan 21
Delta Logo
7:15 am - 4:50 pm
STL
-
ICN
19h 35m2 stops
Delta Logo
7:00 pm - 11:15 pm
ICN
-
STL
18h 15m2 stops
$850Delta
Mon, Mar 30 - Mon, Apr 6
Japan Airlines Logo
1:35 pm - 6:20 pm
STL
-
GMP
37h 45m2 stops
Japan Airlines Logo
7:40 pm - 11:59 pm
GMP
-
STL
43h 19m2 stops
$879Japan Airlines
Thu, Jan 22 - Mon, Jan 26
Japan Airlines Logo
7:04 am - 6:20 pm
STL
-
GMP
44h 16m2 stops
Japan Airlines Logo
8:00 am - 11:59 pm
GMP
-
STL
30h 59m2 stops
$880Japan Airlines
Thu, Jan 22 - Mon, Jan 26
Japan Airlines Logo
7:15 am - 10:05 pm
STL
-
GMP
23h 50m2 stops
Japan Airlines Logo
12:05 pm - 11:59 pm
GMP
-
STL
26h 54m2 stops
$912Japan Airlines
Sun, Jan 11 - Wed, Jan 21

American Airlines flights from St. Louis to Seoul

Our best American Airlines deals on St. Louis to Seoul flight tickets
American Airlines
Feb 11
STL7:15 amLambert-St Louis
18h 30m
1 stop
ICN4:45 pmIncheon Intl
Feb 28
ICN7:15 pmIncheon Intl
28h 37m
1 stop
STL8:52 amLambert-St Louis
$851
Find similar
American Airlines
Mar 28
STL6:50 pmLambert-St Louis
30h 40m
1 stop
ICN3:30 pmIncheon Intl
Apr 6
ICN5:25 pmIncheon Intl
19h 33m
1 stop
STL10:58 pmLambert-St Louis
$852
Find similar
American Airlines
Mar 28
STL6:53 pmLambert-St Louis
30h 37m
2 stops
ICN3:30 pmIncheon Intl
Apr 5
ICN5:25 pmIncheon Intl
29h 30m
1 stop
STL8:55 amLambert-St Louis
$906
Find similar

Delta flights from St. Louis to Seoul

Our best Delta deals on St. Louis to Seoul flight tickets
Delta
Mar 29
STL6:59 pmLambert-St Louis
29h 11m
1 stop
ICN2:10 pmIncheon Intl
Apr 7
ICN6:50 pmIncheon Intl
19h 08m
1 stop
STL11:58 pmLambert-St Louis
$845
Find similar
Delta
Jan 11
STL6:10 amLambert-St Louis
18h 20m
1 stop
ICN3:30 pmIncheon Intl
Jan 21
ICN6:00 pmIncheon Intl
17h 37m
1 stop
STL8:37 pmLambert-St Louis
$846
Find similar
Delta
Mar 30
STL7:15 amLambert-St Louis
18h 05m
1 stop
ICN3:20 pmIncheon Intl
Apr 1
ICN7:00 pmIncheon Intl
19h 21m
2 stops
STL12:21 amLambert-St Louis
$850
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 26, 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

Mon 3/30

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Wed 4/1

8:35 pm-11:59 pm

1 stop17h 24m

$745

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/2

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Thu 4/16

8:35 pm-11:59 pm

1 stop17h 24m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 3/29

4:20 pm-6:35 pm

1 stop36h 15m

Incheon Intl

Wed 4/1

8:35 pm-11:59 pm

1 stop17h 24m

$752

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 3/30

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Fri 4/3

8:35 pm-11:59 pm

1 stop17h 24m

$755

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 3/29

6:59 pm-2:10 pm

1 stop29h 11m

Incheon Intl

Tue 4/7

6:50 pm-11:58 pm

1 stop19h 08m

$845

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 1/11

6:10 am-3:30 pm

1 stop18h 20m

Incheon Intl

Wed 1/21

6:00 pm-8:37 pm

1 stop17h 37m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 3/30

7:15 am-4:50 pm

2 stops19h 35m

Incheon Intl

Mon 4/6

7:00 pm-11:15 pm

2 stops18h 15m

$850

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Thu 1/22

1:35 pm-6:20 pm

2 stops37h 45m

Seoul Gimpo Intl

Mon 1/26

7:40 pm-11:59 pm

2 stops43h 19m

$879

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Thu 1/22

7:04 am-6:20 pm

2 stops44h 16m

Seoul Gimpo Intl

Mon 1/26

8:00 am-11:59 pm

2 stops30h 59m

$880

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sun 1/11

7:15 am-10:05 pm

2 stops23h 50m

Seoul Gimpo Intl

Wed 1/21

12:05 pm-11:59 pm

2 stops26h 54m

$912

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 $1,121 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

18h 10m

Direct flights

None
The fastest flight from St. Louis to Seoul takes 18h 10m
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. 18h 10m 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
10,562 reviews
Search Air Canada flights
American AirlinesPriceFrom $846Free CancellationRating
7.2
11,064 reviews
Search American Airlines flights
DeltaPriceFrom $846Free CancellationRating
7.9
8,014 reviews
Search Delta flights
United AirlinesPriceFrom $870Free CancellationRating
7.4
9,116 reviews
Search United Airlines flights
Korean AirPriceFrom $999Free CancellationRating
8.4
1,185 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