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Cheap flights from St. Louis to Seoul from $433

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 1/12. 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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Find the cheapest flights from St. Louis to Seoul

Cheap round-trip flights

Enter your travel dates to find the best prices.
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 - Wed, Mar 4
United Airlines Logo
1:11 pm - 5:40 am
STL
-
ICN
25h 29m2 stops
United Airlines Logo
6:00 pm - 10:00 pm
ICN
-
STL
19h 00m2 stops
$850United Airlines
Sun, Feb 15 - Wed, Mar 4
Delta Logo
11:23 am - 3:30 pm
STL
-
ICN
37h 07m1 stop
Delta Logo
9:35 am - 8:43 pm
ICN
-
STL
26h 08m1 stop
$851Delta
Sun, Feb 8 - Sun, Feb 22
American Airlines Logo
7:15 am - 4:45 pm
STL
-
ICN
18h 30m1 stop
American Airlines Logo
7:15 pm - 11:18 pm
ICN
-
STL
19h 03m1 stop
$856American Airlines
Fri, Feb 6 - Fri, Feb 20
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 14 - Wed, Jan 28
American Airlines Logo
5:50 am - 4:45 pm
STL
-
ICN
19h 55m1 stop
American Airlines Logo
7:15 pm - 8:32 am
ICN
-
STL
28h 17m2 stops
$860American Airlines
Fri, Feb 6 - Fri, Feb 20
Delta Logo
6:59 pm - 4:00 am
STL
-
ICN
19h 01m1 stop
Delta Logo
7:20 pm - 12:18 am
ICN
-
STL
18h 58m2 stops
$870Delta
Sun, Mar 29 - Wed, Apr 8
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
$890Japan Airlines
Sun, Jan 18 - Fri, Jan 23
Multiple Airlines Logo
7:05 am - 10:05 pm
STL
-
GMP
25h 00m2 stops
Multiple Airlines Logo
8:00 am - 8:06 pm
GMP
-
STL
26h 06m2 stops
$1,686Multiple Airlines
Sun, Mar 15 - Thu, Mar 19
Multiple Airlines Logo
10:03 am - 9:50 pm
STL
-
GMP
21h 47m2 stops
Multiple Airlines Logo
7:55 am - 4:13 pm
GMP
-
STL
22h 18m2 stops
$1,808Multiple Airlines
Thu, Apr 2 - Thu, Apr 16

United Airlines flights from St. Louis to Seoul

Our best United Airlines deals on St. Louis to Seoul flight tickets
United Airlines
Feb 15
STL3:15 pmLambert-St Louis
23h 25m
2 stops
ICN5:40 amIncheon Intl
Mar 4
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
Mar 4
ICN6:00 pmIncheon Intl
19h 00m
2 stops
STL10:00 pmLambert-St Louis
$850
Find similar
United Airlines
Feb 7
STL5:00 pmLambert-St Louis
21h 40m
1 stop
ICN5:40 amIncheon Intl
Apr 26
ICN4:50 pmIncheon Intl
27h 02m
1 stop
STL5:52 amLambert-St Louis
$866
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
19h 01m
1 stop
ICN4:00 amIncheon Intl
Apr 8
ICN7:20 pmIncheon Intl
18h 58m
2 stops
STL12:18 amLambert-St Louis
$870
Find similar
Delta
Mar 20
STL5:29 pmLambert-St Louis
32h 01m
1 stop
ICN3:30 pmIncheon Intl
Mar 29
ICN6:50 pmIncheon Intl
18h 52m
1 stop
STL11:42 pmLambert-St Louis
$871
Find similar
Delta
Feb 7
STL6:10 amLambert-St Louis
19h 20m
2 stops
ICN4:30 pmIncheon Intl
Apr 26
ICN7:20 pmIncheon Intl
19h 16m
2 stops
STL12:36 amLambert-St Louis
$949
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 4, 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

Sun 2/15

5:25 pm-5:40 am

1 stop21h 15m

Incheon Intl

Wed 3/4

12:45 pm-4:44 pm

1 stop18h 59m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/15

1:11 pm-5:40 am

2 stops25h 29m

Incheon Intl

Wed 3/4

6:00 pm-10:00 pm

2 stops19h 00m

$850

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/8

11:23 am-3:30 pm

1 stop37h 07m

Incheon Intl

Sun 2/22

9:35 am-8:43 pm

1 stop26h 08m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 2/6

7:15 am-4:45 pm

1 stop18h 30m

Incheon Intl

Fri 2/20

7:15 pm-11:18 pm

1 stop19h 03m

$856

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 1/14

7:04 am-10:05 pm

2 stops24h 01m

Seoul Gimpo Intl

Wed 1/28

12:05 pm-11:59 pm

2 stops26h 54m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 2/6

5:50 am-4:45 pm

1 stop19h 55m

Incheon Intl

Fri 2/20

7:15 pm-8:32 am

2 stops28h 17m

$860

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 3/29

6:59 pm-4:00 am

1 stop19h 01m

Incheon Intl

Wed 4/8

7:20 pm-12:18 am

2 stops18h 58m

$870

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sun 1/18

7:04 am-10:05 pm

2 stops24h 01m

Seoul Gimpo Intl

Fri 1/23

12:05 pm-11:59 pm

2 stops26h 54m

$890

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sun 3/15

7:05 am-10:05 pm

2 stops25h 00m

Seoul Gimpo Intl

Thu 3/19

8:00 am-8:06 pm

2 stops26h 06m

$1,686

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Thu 4/2

10:03 am-9:50 pm

2 stops21h 47m

Seoul Gimpo Intl

Thu 4/16

7:55 am-4:13 pm

2 stops22h 18m

$1,808

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 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 $1,170 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

17h 50m

Direct flights

None
The fastest flight from St. Louis to Seoul takes 17h 50m
There are no direct flights from St. Louis to Seoul. There are no popular flight routes from St. Louis to Seoul.
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  • How far is Lambert-St Louis to Seoul by plane?

    The distance between Lambert-St Louis and Seoul is about 6661.9 mi. 18h 30m 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
10,500 reviews
Search Air Canada flights
American AirlinesPriceFrom $846Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
DeltaPriceFrom $846Free CancellationRating
7.9
8,011 reviews
Search Delta flights
United AirlinesPriceFrom $870Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights
Korean AirPriceFrom $999Free CancellationRating
8.4
1,179 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