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Cheap flights from St. Louis to Seoul from $402

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 1/9. 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
$766Alaska Airlines
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Sun, Apr 5 - Wed, Apr 15
Alaska Airlines Logo
2:55 pm - 6:35 pmSTL-ICN
37h 40m1 stop
Alaska Airlines Logo
8:35 pm - 11:55 pmICN-STL
17h 20m1 stop
$773Alaska Airlines
Find Deal
Sat, Apr 4 - Wed, Apr 15
American Airlines Logo
7:58 pm - 4:45 pmSTL-ICN
29h 47m2 stops
American Airlines Logo
7:15 pm - 12:37 pmICN-STL
32h 22m1 stop
$841American Airlines
Find Deal
Mon, Nov 10 - Thu, Nov 27
American Airlines Logo
7:58 pm - 4:45 pmSTL-ICN
29h 47m2 stops
American Airlines Logo
7:15 pm - 10:39 amICN-STL
30h 24m1 stop
$843American Airlines
Find Deal
Mon, Nov 10 - Thu, Nov 27
Delta Logo
6:30 am - 4:20 pmSTL-ICN
18h 50m1 stop
Delta Logo
7:30 pm - 10:16 pmICN-STL
17h 46m1 stop
$846Delta
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Mon, Dec 8 - Sat, Dec 27
Delta Logo
6:00 am - 4:30 pmSTL-ICN
19h 30m2 stops
Delta Logo
7:30 pm - 10:16 pmICN-STL
17h 46m1 stop
$851Delta
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Mon, Dec 8 - Sat, Dec 27
United Airlines Logo
5:25 pm - 4:15 pmSTL-ICN
31h 50m1 stop
United Airlines Logo
11:45 am - 4:44 pmICN-STL
18h 59m1 stop
$853United Airlines
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Sat, Feb 28 - Wed, Mar 11
United Airlines Logo
5:25 pm - 4:15 pmSTL-ICN
31h 50m1 stop
United Airlines Logo
5:00 pm - 9:48 amICN-STL
30h 48m2 stops
$858United Airlines
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Sat, Feb 28 - Thu, Mar 12
Japan Airlines Logo
1:43 pm - 6:20 pmSTL-GMP
37h 37m2 stops
Japan Airlines Logo
12:05 pm - 1:43 pmGMP-STL
40h 38m2 stops
$888Japan Airlines
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Wed, Nov 12 - Thu, Nov 20
Japan Airlines Logo
3:23 pm - 10:55 amSTL-GMP
28h 32m2 stops
Japan Airlines Logo
8:00 am - 11:42 pmGMP-STL
30h 42m2 stops
$1,009Japan Airlines
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Mon, Nov 10 - Tue, Nov 18

American Airlines flights from St. Louis to Seoul

Our best American Airlines deals on St. Louis to Seoul flight tickets
American Airlines
Nov 10
STL7:58 pmLambert-St Louis
29h 47m
2 stops
ICN4:45 pmIncheon Intl
Nov 27
ICN7:15 pmIncheon Intl
32h 22m
1 stop
STL12:37 pmLambert-St Louis
$841
Find similar
American Airlines
Nov 10
STL7:58 pmLambert-St Louis
29h 47m
2 stops
ICN4:45 pmIncheon Intl
Nov 27
ICN7:15 pmIncheon Intl
30h 24m
1 stop
STL10:39 amLambert-St Louis
$843
Find similar
American Airlines
Dec 9
STL5:14 amLambert-St Louis
20h 31m
1 stop
ICN4:45 pmIncheon Intl
Dec 28
ICN7:15 pmIncheon Intl
30h 35m
1 stop
STL10:50 amLambert-St Louis
$852
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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
Feb 28
STL5:25 pmLambert-St Louis
31h 50m
1 stop
ICN4:15 pmIncheon Intl
Mar 11
ICN11:45 amIncheon Intl
18h 59m
1 stop
STL4:44 pmLambert-St Louis
$853
Find similar
United Airlines
Feb 28
STL5:25 pmLambert-St Louis
31h 50m
1 stop
ICN4:15 pmIncheon Intl
Mar 12
ICN5:00 pmIncheon Intl
30h 48m
2 stops
STL9:48 amLambert-St Louis
$858
Find similar
United Airlines
Apr 3
STL1:30 pmLambert-St Louis
24h 50m
2 stops
ICN4:20 amIncheon Intl
Apr 17
ICN4:50 pmIncheon Intl
38h 13m
1 stop
STL5:03 pmLambert-St Louis
$878
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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 October 16, 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 4/5

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Wed 4/15

8:35 pm-11:55 pm

1 stop17h 20m

$766

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/4

2:55 pm-6:35 pm

1 stop37h 40m

Incheon Intl

Wed 4/15

8:35 pm-11:55 pm

1 stop17h 20m

$773

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

7:58 pm-4:45 pm

2 stops29h 47m

Incheon Intl

Thu 11/27

7:15 pm-12:37 pm

1 stop32h 22m

$841

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

7:58 pm-4:45 pm

2 stops29h 47m

Incheon Intl

Thu 11/27

7:15 pm-10:39 am

1 stop30h 24m

$843

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 12/8

6:30 am-4:20 pm

1 stop18h 50m

Incheon Intl

Sat 12/27

7:30 pm-10:16 pm

1 stop17h 46m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 12/8

6:00 am-4:30 pm

2 stops19h 30m

Incheon Intl

Sat 12/27

7:30 pm-10:16 pm

1 stop17h 46m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 2/28

5:25 pm-4:15 pm

1 stop31h 50m

Incheon Intl

Wed 3/11

11:45 am-4:44 pm

1 stop18h 59m

$853

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 2/28

5:25 pm-4:15 pm

1 stop31h 50m

Incheon Intl

Thu 3/12

5:00 pm-9:48 am

2 stops30h 48m

$858

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 11/12

1:43 pm-6:20 pm

2 stops37h 37m

Seoul Gimpo Intl

Thu 11/20

12:05 pm-1:43 pm

2 stops40h 38m

$888

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Mon 11/10

3:23 pm-10:55 am

2 stops28h 32m

Seoul Gimpo Intl

Tue 11/18

8:00 am-11:42 pm

2 stops30h 42m

$1,009

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 $1,266 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 54% 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 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
10,307 reviews
Search Air Canada flights
DeltaPriceFrom $861Free CancellationRating
7.9
7,980 reviews
Search Delta flights
American AirlinesPriceFrom $902Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
United AirlinesPriceFrom $902Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights
Korean AirPriceFrom $1,057Free CancellationRating
8.4
1,149 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