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Cheap flights from St. Louis to Seoul from $448

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.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Seoul

Cheap round-trip flights

American Airlines Logo
8:05 pm - 3:30 pmSTL-ICN
29h 25m2 stops
American Airlines Logo
5:55 pm - 9:20 amICN-STL
29h 25m1 stop
$825American Airlines
Find Deal
Mon, Oct 20 - Sun, Oct 26
American Airlines Logo
5:11 am - 3:30 pmSTL-ICN
20h 19m1 stop
American Airlines Logo
5:55 pm - 9:20 amICN-STL
29h 25m1 stop
$834American Airlines
Find Deal
Mon, Oct 20 - Sun, Oct 26
American Airlines Logo
3:59 pm - 3:30 pmSTL-ICN
33h 31m1 stop
American Airlines Logo
5:55 pm - 9:20 amICN-STL
29h 25m1 stop
$844American Airlines
Find Deal
Sat, Sep 27 - Sun, Oct 26
Delta Logo
6:50 am - 3:20 pmSTL-ICN
18h 30m1 stop
Delta Logo
7:40 pm - 12:24 amICN-STL
19h 44m1 stop
$856Delta
Find Deal
Fri, Oct 24 - Sun, Nov 2
Delta Logo
6:00 am - 4:30 pmSTL-ICN
20h 30m2 stops
Delta Logo
7:40 pm - 12:24 amICN-STL
19h 44m1 stop
$861Delta
Find Deal
Fri, Oct 24 - Sun, Nov 2
Alaska Airlines Logo
2:55 pm - 6:35 pmSTL-ICN
36h 40m1 stop
Alaska Airlines Logo
8:35 pm - 11:56 pmICN-STL
18h 21m1 stop
$864Alaska Airlines
Find Deal
Wed, Feb 4 - Sat, Feb 14
United Airlines Logo
5:15 am - 4:20 amSTL-ICN
33h 05m2 stops
United Airlines Logo
12:45 pm - 10:54 pmICN-STL
24h 09m2 stops
$941United Airlines
Find Deal
Fri, Oct 24 - Sun, Nov 2
Air Canada Logo
4:05 pm - 4:05 pmSTL-ICN
34h 00m2 stops
Air Canada Logo
5:55 pm - 3:29 pmICN-STL
35h 34m2 stops
$1,000Air Canada
Find Deal
Sat, Sep 27 - Sun, Oct 26
United Airlines Logo
9:00 am - 4:20 amSTL-ICN
29h 20m2 stops
United Airlines Logo
4:50 pm - 8:46 pmICN-STL
17h 56m2 stops
$1,045United Airlines
Find Deal
Tue, Oct 7 - Tue, Oct 14
Alaska Airlines Logo
2:55 pm - 6:35 pmSTL-ICN
36h 40m1 stop
Alaska Airlines Logo
8:35 pm - 11:56 pmICN-STL
18h 21m1 stop
$1,046Alaska Airlines
Find Deal
Wed, Feb 11 - Sat, Feb 21

Delta flights from St. Louis to Seoul

Our best Delta deals on St. Louis to Seoul flight tickets
Delta
Oct 24
STL6:50 amLambert-St Louis
18h 30m
1 stop
ICN3:20 pmIncheon Intl
Nov 2
ICN7:40 pmIncheon Intl
19h 44m
1 stop
STL12:24 amLambert-St Louis
$856
Find similar
Delta
Oct 24
STL6:00 amLambert-St Louis
20h 30m
2 stops
ICN4:30 pmIncheon Intl
Nov 2
ICN7:40 pmIncheon Intl
19h 44m
1 stop
STL12:24 amLambert-St Louis
$861
Find similar
Delta
Oct 2
STL6:00 amLambert-St Louis
20h 30m
2 stops
ICN4:30 pmIncheon Intl
Oct 13
ICN6:40 pmIncheon Intl
18h 27m
1 stop
STL11:07 pmLambert-St Louis
$866
Find similar

American Airlines flights from St. Louis to Seoul

Our best American Airlines deals on St. Louis to Seoul flight tickets
American Airlines
Oct 20
STL8:05 pmLambert-St Louis
29h 25m
2 stops
ICN3:30 pmIncheon Intl
Oct 26
ICN5:55 pmIncheon Intl
29h 25m
1 stop
STL9:20 amLambert-St Louis
$825
Find similar
American Airlines
Oct 20
STL5:11 amLambert-St Louis
20h 19m
1 stop
ICN3:30 pmIncheon Intl
Oct 26
ICN5:55 pmIncheon Intl
29h 25m
1 stop
STL9:20 amLambert-St Louis
$834
Find similar
American Airlines
Sep 27
STL3:59 pmLambert-St Louis
33h 31m
1 stop
ICN3:30 pmIncheon Intl
Oct 26
ICN5:55 pmIncheon Intl
29h 25m
1 stop
STL9:20 amLambert-St Louis
$844
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 September 15, 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 10/20

8:05 pm-3:30 pm

2 stops29h 25m

Incheon Intl

Sun 10/26

5:55 pm-9:20 am

1 stop29h 25m

$825

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 10/20

5:11 am-3:30 pm

1 stop20h 19m

Incheon Intl

Sun 10/26

5:55 pm-9:20 am

1 stop29h 25m

$834

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 9/27

3:59 pm-3:30 pm

1 stop33h 31m

Incheon Intl

Sun 10/26

5:55 pm-9:20 am

1 stop29h 25m

$844

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

6:50 am-3:20 pm

1 stop18h 30m

Incheon Intl

Sun 11/2

7:40 pm-12:24 am

1 stop19h 44m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

6:00 am-4:30 pm

2 stops20h 30m

Incheon Intl

Sun 11/2

7:40 pm-12:24 am

1 stop19h 44m

$861

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 2/4

2:55 pm-6:35 pm

1 stop36h 40m

Incheon Intl

Sat 2/14

8:35 pm-11:56 pm

1 stop18h 21m

$864

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

5:15 am-4:20 am

2 stops33h 05m

Incheon Intl

Sun 11/2

12:45 pm-10:54 pm

2 stops24h 09m

$941

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 9/27

4:05 pm-4:05 pm

2 stops34h 00m

Incheon Intl

Sun 10/26

5:55 pm-3:29 pm

2 stops35h 34m

$1,000

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 10/7

9:00 am-4:20 am

2 stops29h 20m

Incheon Intl

Tue 10/14

4:50 pm-8:46 pm

2 stops17h 56m

$1,045

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 2/11

2:55 pm-6:35 pm

1 stop36h 40m

Incheon Intl

Sat 2/21

8:35 pm-11:56 pm

1 stop18h 21m

$1,046

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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 January is another great option to travel to Seoul, with average flight prices from St. Louis averaging around $895.

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 $1,265 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 14% 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 09m 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
10,000 reviews
Search Air Canada flights
DeltaPriceFrom $866Free CancellationRating
7.9
7,954 reviews
Search Delta flights
American AirlinesPriceFrom $902Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $902Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
Korean AirPriceFrom $1,057Free CancellationRating
8.4
1,139 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