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Cheap flights from St. Louis to Seoul from $428

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 12/7. 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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Cheap round-trip flights

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Alaska Airlines Logo
7:00 am - 6:35 pmSTL-ICN
21h 35m1 stop
Alaska Airlines Logo
8:35 pm - 11:55 pmICN-STL
17h 20m1 stop
$746Alaska Airlines
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Sat, Mar 28 - Fri, Apr 10
American Airlines Logo
5:17 am - 4:45 pmSTL-ICN
20h 28m1 stop
American Airlines Logo
7:15 pm - 10:25 pmICN-STL
18h 10m1 stop
$846American Airlines
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Thu, Nov 27 - Thu, Dec 4
United Airlines Logo
8:25 am - 5:40 amSTL-ICN
30h 15m2 stops
United Airlines Logo
6:00 pm - 10:45 pmICN-STL
19h 45m2 stops
$850United Airlines
Find Deal
Thu, Nov 27 - Thu, Dec 4
American Airlines Logo
7:00 am - 4:45 pmSTL-ICN
18h 45m1 stop
American Airlines Logo
7:15 pm - 10:47 pmICN-STL
18h 32m1 stop
$856American Airlines
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Sat, Nov 29 - Mon, Dec 8
Delta Logo
11:51 am - 4:00 amSTL-ICN
26h 09m1 stop
Delta Logo
4:25 pm - 11:38 pmICN-STL
21h 13m1 stop
$866Delta
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Sun, Apr 26 - Wed, Apr 29
Delta Logo
6:30 am - 5:20 pmSTL-ICN
20h 50m1 stop
Delta Logo
7:20 pm - 12:37 amICN-STL
19h 17m2 stops
$870Delta
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Sat, Mar 28 - Fri, Apr 10
Japan Airlines Logo
7:00 am - 10:05 pmSTL-GMP
24h 05m2 stops
Japan Airlines Logo
12:05 pm - 11:57 pmGMP-STL
26h 52m2 stops
$889Japan Airlines
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Tue, Dec 2 - Sat, Dec 13
Multiple Airlines Logo
7:00 am - 10:05 pmSTL-GMP
24h 05m2 stops
Multiple Airlines Logo
8:00 am - 3:27 pmGMP-STL
22h 27m2 stops
$1,000Multiple Airlines
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Thu, Nov 27 - Thu, Dec 4
Japan Airlines Logo
6:20 am - 6:20 pmSTL-GMP
45h 00m2 stops
Japan Airlines Logo
8:00 am - 11:51 pmGMP-STL
30h 51m2 stops
$1,574Japan Airlines
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Wed, Dec 24 - Thu, Jan 1
Multiple Airlines Logo
7:00 am - 10:05 pmSTL-GMP
24h 05m2 stops
Multiple Airlines Logo
8:00 am - 4:34 pmGMP-STL
23h 34m2 stops
$1,656Multiple Airlines
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Sat, Nov 29 - Mon, Dec 8

American Airlines flights from St. Louis to Seoul

Our best American Airlines deals on St. Louis to Seoul flight tickets
American Airlines
Nov 27
STL5:17 amLambert-St Louis
20h 28m
1 stop
ICN4:45 pmIncheon Intl
Dec 4
ICN7:15 pmIncheon Intl
18h 10m
1 stop
STL10:25 pmLambert-St Louis
$846
Find similar
American Airlines
Nov 29
STL7:00 amLambert-St Louis
18h 45m
1 stop
ICN4:45 pmIncheon Intl
Dec 8
ICN7:15 pmIncheon Intl
18h 32m
1 stop
STL10:47 pmLambert-St Louis
$856
Find similar
American Airlines
Nov 29
STL7:00 amLambert-St Louis
18h 45m
1 stop
ICN4:45 pmIncheon Intl
Dec 8
ICN7:15 pmIncheon Intl
19h 23m
2 stops
STL11:38 pmLambert-St Louis
$860
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United Airlines flights from St. Louis to Seoul

Our best United Airlines deals on St. Louis to Seoul flight tickets
United Airlines
Nov 27
STL8:25 amLambert-St Louis
30h 15m
2 stops
ICN5:40 amIncheon Intl
Dec 4
ICN6:00 pmIncheon Intl
19h 45m
2 stops
STL10:45 pmLambert-St Louis
$850
Find similar
United Airlines
Mar 11
STL3:00 pmLambert-St Louis
23h 40m
2 stops
ICN4:40 amIncheon Intl
Apr 18
ICN11:30 amIncheon Intl
19h 22m
2 stops
STL4:52 pmLambert-St Louis
$952
Find similar
United Airlines
Mar 28
STL5:54 pmLambert-St Louis
20h 26m
2 stops
ICN4:20 amIncheon Intl
Apr 10
ICN4:50 pmIncheon Intl
30h 38m
2 stops
STL9:28 amLambert-St Louis
$1,000
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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 November 14, 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

Sat 3/28

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Fri 4/10

8:35 pm-11:55 pm

1 stop17h 20m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 11/27

5:17 am-4:45 pm

1 stop20h 28m

Incheon Intl

Thu 12/4

7:15 pm-10:25 pm

1 stop18h 10m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 11/27

8:25 am-5:40 am

2 stops30h 15m

Incheon Intl

Thu 12/4

6:00 pm-10:45 pm

2 stops19h 45m

$850

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 11/29

7:00 am-4:45 pm

1 stop18h 45m

Incheon Intl

Mon 12/8

7:15 pm-10:47 pm

1 stop18h 32m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 4/26

11:51 am-4:00 am

1 stop26h 09m

Incheon Intl

Wed 4/29

4:25 pm-11:38 pm

1 stop21h 13m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 3/28

6:30 am-5:20 pm

1 stop20h 50m

Incheon Intl

Fri 4/10

7:20 pm-12:37 am

2 stops19h 17m

$870

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 12/2

7:00 am-10:05 pm

2 stops24h 05m

Seoul Gimpo Intl

Sat 12/13

12:05 pm-11:57 pm

2 stops26h 52m

$889

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Thu 11/27

7:00 am-10:05 pm

2 stops24h 05m

Seoul Gimpo Intl

Thu 12/4

8:00 am-3:27 pm

2 stops22h 27m

$1,000

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 12/24

6:20 am-6:20 pm

2 stops45h 00m

Seoul Gimpo Intl

Thu 1/1

8:00 am-11:51 pm

2 stops30h 51m

$1,574

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sat 11/29

7:00 am-10:05 pm

2 stops24h 05m

Seoul Gimpo Intl

Mon 12/8

8:00 am-4:34 pm

2 stops23h 34m

$1,656

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 $1,166 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 48% 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

Direct flights

None
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 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
10,450 reviews
Search Air Canada flights
American AirlinesPriceFrom $846Free CancellationRating
7.2
11,048 reviews
Search American Airlines flights
DeltaPriceFrom $846Free CancellationRating
7.9
8,010 reviews
Search Delta flights
United AirlinesPriceFrom $902Free CancellationRating
7.4
9,016 reviews
Search United Airlines flights
Korean AirPriceFrom $1,057Free CancellationRating
8.4
1,163 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.

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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