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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 11/16. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
2:50 pm - 6:35 pmSTL-ICN
36h 45m1 stop
Alaska Airlines Logo
8:35 pm - 1:54 pmICN-STL
32h 19m1 stop
$759Alaska Airlines
Find Deal
Tue, Jan 13 - Thu, Jan 22
American Airlines Logo
7:00 am - 4:45 pmSTL-ICN
18h 45m1 stop
American Airlines Logo
7:15 pm - 10:39 amICN-STL
30h 24m1 stop
$838American 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
$839American Airlines
Find Deal
Mon, Nov 10 - Thu, Nov 27
United Airlines Logo
1:15 pm - 5:40 amSTL-ICN
25h 25m2 stops
United Airlines Logo
12:45 pm - 3:37 pmICN-STL
17h 52m1 stop
$846United Airlines
Find Deal
Tue, Jan 13 - Thu, Jan 22
United Airlines Logo
3:11 pm - 5:40 amSTL-ICN
23h 29m2 stops
United Airlines Logo
12:45 pm - 8:58 pmICN-STL
23h 13m2 stops
$851United Airlines
Find Deal
Tue, Jan 13 - Thu, Jan 22
American Airlines Logo
7:00 am - 4:45 pmSTL-ICN
18h 45m1 stop
American Airlines Logo
7:15 pm - 10:34 pmICN-STL
18h 19m1 stop
$856American Airlines
Find Deal
Sun, Nov 16 - Sun, Nov 23
Hawaiian Airlines Logo
5:26 pm - 6:35 pmSTL-ICN
34h 09m1 stop
Hawaiian Airlines Logo
8:35 pm - 1:54 pmICN-STL
32h 19m1 stop
$1,190Hawaiian Airlines
Find Deal
Wed, Dec 24 - Mon, Jan 19
Delta Logo
2:18 pm - 5:10 amSTL-ICN
23h 52m2 stops
Delta Logo
8:05 pm - 11:25 pmICN-STL
18h 20m2 stops
$1,276Delta
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Wed, Dec 24 - Mon, Jan 19
Delta Logo
2:18 pm - 5:10 amSTL-ICN
23h 52m2 stops
Delta Logo
7:25 pm - 11:56 amICN-STL
31h 31m1 stop
$1,282Delta
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Wed, Dec 24 - Mon, Jan 19
Air Canada Logo
11:05 am - 6:25 pmSTL-ICN
40h 20m2 stops
Air Canada Logo
6:55 pm - 10:22 pmICN-STL
42h 27m2 stops
$2,466Air Canada
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Thu, Dec 18 - Thu, Dec 25

American Airlines flights from St. Louis to Incheon Intl Airport

Our best American Airlines deals on St. Louis to Incheon Intl Airport flight tickets
American Airlines
Nov 10
STL7:00 amLambert-St Louis
18h 45m
1 stop
ICN4:45 pmIncheon Intl
Nov 27
ICN7:15 pmIncheon Intl
30h 24m
1 stop
STL10:39 amLambert-St Louis
$838
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
$839
Find similar
American Airlines
Nov 13
STL5:17 amLambert-St Louis
20h 28m
1 stop
ICN4:45 pmIncheon Intl
Nov 20
ICN7:15 pmIncheon Intl
18h 19m
1 stop
STL10:34 pmLambert-St Louis
$846
Find similar

United Airlines flights from St. Louis to Incheon Intl Airport

Our best United Airlines deals on St. Louis to Incheon Intl Airport flight tickets
United Airlines
Jan 13
STL1:15 pmLambert-St Louis
25h 25m
2 stops
ICN5:40 amIncheon Intl
Jan 22
ICN12:45 pmIncheon Intl
17h 52m
1 stop
STL3:37 pmLambert-St Louis
$846
Find similar
United Airlines
Jan 13
STL3:11 pmLambert-St Louis
23h 29m
2 stops
ICN5:40 amIncheon Intl
Jan 22
ICN12:45 pmIncheon Intl
23h 13m
2 stops
STL8:58 pmLambert-St Louis
$851
Find similar
United Airlines
Nov 10
STL1:35 pmLambert-St Louis
25h 05m
2 stops
ICN5:40 amIncheon Intl
Nov 27
ICN12:45 pmIncheon Intl
48h 09m
2 stops
STL9:54 pmLambert-St Louis
$859
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Incheon Intl Airport 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 3, 2025.
Use the filters below to find and compare flights from St. Louis to Incheon Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 1/13

2:50 pm-6:35 pm

1 stop36h 45m

Incheon Intl

Thu 1/22

8:35 pm-1:54 pm

1 stop32h 19m

$759

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

7:00 am-4:45 pm

1 stop18h 45m

Incheon Intl

Thu 11/27

7:15 pm-10:39 am

1 stop30h 24m

$838

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

$839

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 1/13

1:15 pm-5:40 am

2 stops25h 25m

Incheon Intl

Thu 1/22

12:45 pm-3:37 pm

1 stop17h 52m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 1/13

3:11 pm-5:40 am

2 stops23h 29m

Incheon Intl

Thu 1/22

12:45 pm-8:58 pm

2 stops23h 13m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 11/16

7:00 am-4:45 pm

1 stop18h 45m

Incheon Intl

Sun 11/23

7:15 pm-10:34 pm

1 stop18h 19m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 12/24

5:26 pm-6:35 pm

1 stop34h 09m

Incheon Intl

Mon 1/19

8:35 pm-1:54 pm

1 stop32h 19m

$1,190

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 12/24

2:18 pm-5:10 am

2 stops23h 52m

Incheon Intl

Mon 1/19

8:05 pm-11:25 pm

2 stops18h 20m

$1,276

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 12/24

2:18 pm-5:10 am

2 stops23h 52m

Incheon Intl

Mon 1/19

7:25 pm-11:56 am

1 stop31h 31m

$1,282

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 12/18

11:05 am-6:25 pm

2 stops40h 20m

Incheon Intl

Thu 12/25

6:55 pm-10:22 pm

2 stops42h 27m

$2,466

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Incheon Intl Airport

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 Incheon Intl Airport?

The cheapest month to fly to Incheon Intl Airport from St. Louis is in October. Flight prices, which tend to average around $866, are often lower during this time because this is during the off-season. If you are unable to visit Incheon Intl Airport during the month of October, then departing from St. Louis during the month January is also very affordable. Most momondo users find prices during this month for around $902.

What is the cheapest day to depart on your flight to Incheon Intl Airport?

The cheapest day to depart from St. Louis to Incheon Intl Airport is on a Wednesday when prices can be found for as low as $1,462. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $1,782. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

What is the cheapest time of day to depart on your flight to Incheon Intl Airport?

In the afternoon is the cheapest time of day to fly from St. Louis to Incheon Intl Airport when you can find flight prices for as low as $1,485. Flying to Incheon Intl Airport in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,718 on average. Flights to Incheon Intl Airport from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Incheon Intl Airport?

You are more likely to see cheaper flights to Incheon Intl Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Incheon Intl Airport for around $1,213 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Incheon Intl Airport from St. Louis for as low as $1,065 on momondo.

When to book flights from St. Louis to Incheon Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Incheon Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Incheon Intl Airport (STL to ICN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Incheon Intl Airport

Direct flights

None
There are no direct flights from St. Louis to Incheon Intl Airport. There are no popular flight routes from St. Louis to Incheon Intl Airport.
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  • How far is Lambert-St Louis to Incheon Intl by plane?

    The straight-line distance from Lambert-St Louis to Incheon Intl is 6682.0 mi. By plane, this route typically takes 18h 45m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Incheon Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Incheon Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Incheon Intl Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Incheon Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Incheon Intl Airport.

  • What documentation or ID do you need to fly to Incheon Intl Airport?

    The travel and health documents required for your trip to Incheon Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Incheon Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Incheon Intl Airport?

Best airlines flying from St. Louis to Incheon Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Incheon Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $799Free CancellationRating
7.1
10,394 reviews
Search Air Canada flights
American AirlinesPriceFrom $846Free CancellationRating
7.2
11,035 reviews
Search American Airlines flights
DeltaPriceFrom $846Free CancellationRating
7.9
8,001 reviews
Search Delta flights
United AirlinesPriceFrom $902Free CancellationRating
7.4
8,996 reviews
Search United Airlines flights
Korean AirPriceFrom $1,057Free CancellationRating
8.4
1,158 reviews
Search Korean Air flights

Traveling to a place near Seoul?

Book flights to Seoul if you plan to visit one of these locations
Suwon
Seongnam
Daejeon
Anyang

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Seoul?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Seoul. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from St. Louis to Seoul with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Seoul flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Seoul?

Once you have performed a search for St. Louis to Seoul flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Seoul right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Seoul now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seoul and let you know when they change.

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