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Cheap flights from St. Louis to Seoul from $640

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 8/20. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Seoul

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
2:00 pm - 6:45 pm
STL
-
ICN
38h 45m
2 stops
WestJet Logo
8:45 pm - 6:15 pm
ICN
-
STL
35h 30m
2 stops
$1,095WestJet
Fri, Oct 16 - Sun, Oct 25
WestJet Logo
2:00 pm - 6:45 pm
STL
-
ICN
38h 45m
2 stops
WestJet Logo
8:45 pm - 6:15 pm
ICN
-
STL
35h 30m
2 stops
$1,102WestJet
Fri, Oct 16 - Sun, Oct 25
Delta Logo
12:00 pm - 4:00 am
STL
-
ICN
26h 00m
1 stop
Delta Logo
6:35 pm - 12:34 am
ICN
-
STL
20h 59m
1 stop
$1,106Delta
Mon, Oct 5 - Wed, Nov 4
Delta Logo
6:15 am - 4:50 pm
STL
-
ICN
20h 35m
2 stops
Delta Logo
6:45 pm - 12:34 am
ICN
-
STL
20h 49m
2 stops
$1,110Delta
Mon, Oct 5 - Wed, Nov 4
WestJet Logo
2:30 pm - 6:45 pm
STL
-
ICN
62h 15m
2 stops
WestJet Logo
8:45 pm - 11:48 pm
ICN
-
STL
41h 03m
2 stops
$1,139WestJet
Mon, Sep 21 - Sat, Oct 17
WestJet Logo
3:54 pm - 6:45 pm
STL
-
ICN
36h 51m
2 stops
WestJet Logo
8:45 pm - 3:54 pm
ICN
-
STL
33h 09m
2 stops
$1,142WestJet
Sun, Sep 13 - Sun, Sep 27
Japan Airlines Logo
9:32 am - 9:15 pm
STL
-
GMP
21h 43m
2 stops
Japan Airlines Logo
8:00 am - 10:59 pm
GMP
-
STL
28h 59m
2 stops
$1,332Japan Airlines
Tue, Aug 18 - Tue, Aug 25
Japan Airlines Logo
6:00 am - 5:55 pm
STL
-
GMP
45h 55m
2 stops
Japan Airlines Logo
8:00 am - 4:20 pm
GMP
-
STL
22h 20m
2 stops
$1,362Japan Airlines
Sun, Aug 30 - Thu, Sep 3
Multiple Airlines Logo
6:00 am - 9:15 pm
STL
-
GMP
25h 15m
2 stops
Multiple Airlines Logo
12:05 pm - 10:59 pm
GMP
-
STL
24h 54m
2 stops
$1,466Multiple Airlines
Tue, Aug 18 - Tue, Aug 25
Multiple Airlines Logo
6:00 am - 9:15 pm
STL
-
GMP
25h 15m
2 stops
Multiple Airlines Logo
8:00 am - 6:38 pm
GMP
-
STL
24h 38m
2 stops
$1,508Multiple Airlines
Sun, Aug 9 - Thu, Aug 20

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Air Canada flights from St. Louis to Seoul

Our best Air Canada deals on St. Louis to Seoul flight tickets
Air Canada
Oct 5
STL12:10 pmLambert-St Louis
38h 15m
1 stop
ICN4:25 pmIncheon Intl
Nov 4
ICN8:10 pmIncheon Intl
34h 16m
1 stop
STL3:26 pmLambert-St Louis
$1,200
Air Canada
Sep 21
STL12:10 pmLambert-St Louis
38h 15m
1 stop
ICN4:25 pmIncheon Intl
Oct 17
ICN5:45 pmIncheon Intl
34h 15m
2 stops
STL2:00 pmLambert-St Louis
$1,237
Air Canada
Sep 14
STL12:10 pmLambert-St Louis
38h 15m
1 stop
ICN4:25 pmIncheon Intl
Sep 27
ICN5:45 pmIncheon Intl
38h 56m
2 stops
STL6:41 pmLambert-St Louis
$1,243

Cathay Pacific flights from St. Louis to Seoul

Our best Cathay Pacific deals on St. Louis to Seoul flight tickets
Cathay Pacific
Aug 4
STL9:08 amLambert-St Louis
37h 32m
2 stops
ICN12:40 pmIncheon Intl
Aug 18
ICN8:05 pmIncheon Intl
51h 19m
2 stops
STL9:24 amLambert-St Louis
$1,215
Cathay Pacific
Oct 12
STL6:04 amLambert-St Louis
28h 21m
2 stops
ICN12:25 amIncheon Intl
Jan 20
ICN3:00 pmIncheon Intl
46h 59m
2 stops
STL10:59 pmLambert-St Louis
$1,260
Cathay Pacific
Oct 16
STL7:10 pmLambert-St Louis
27h 30m
2 stops
ICN12:40 pmIncheon Intl
Jan 18
ICN3:00 pmIncheon Intl
46h 59m
2 stops
STL10:59 pmLambert-St Louis
$1,310

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 July 8, 2026.
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

Cheapest round-trip

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/16

2:00 pm-6:45 pm

2 stops38h 45m

Incheon Intl

Sun 10/25

8:45 pm-6:15 pm

2 stops35h 30m

$1,095

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/16

2:00 pm-6:45 pm

2 stops38h 45m

Incheon Intl

Sun 10/25

8:45 pm-6:15 pm

2 stops35h 30m

$1,102

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 10/5

12:00 pm-4:00 am

1 stop26h 00m

Incheon Intl

Wed 11/4

6:35 pm-12:34 am

1 stop20h 59m

$1,106
Quickest round-trip

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 10/5

6:15 am-4:50 pm

2 stops20h 35m

Incheon Intl

Wed 11/4

6:45 pm-12:34 am

2 stops20h 49m

$1,110

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 9/21

2:30 pm-6:45 pm

2 stops62h 15m

Incheon Intl

Sat 10/17

8:45 pm-11:48 pm

2 stops41h 03m

$1,139

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 9/13

3:54 pm-6:45 pm

2 stops36h 51m

Incheon Intl

Sun 9/27

8:45 pm-3:54 pm

2 stops33h 09m

$1,142

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 8/18

9:32 am-9:15 pm

2 stops21h 43m

Seoul Gimpo Intl

Tue 8/25

8:00 am-10:59 pm

2 stops28h 59m

$1,332

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sun 8/30

6:00 am-5:55 pm

2 stops45h 55m

Seoul Gimpo Intl

Thu 9/3

8:00 am-4:20 pm

2 stops22h 20m

$1,362

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 8/18

6:00 am-9:15 pm

2 stops25h 15m

Seoul Gimpo Intl

Tue 8/25

12:05 pm-10:59 pm

2 stops24h 54m

$1,466

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sun 8/9

6:00 am-9:15 pm

2 stops25h 15m

Seoul Gimpo Intl

Thu 8/20

8:00 am-6:38 pm

2 stops24h 38m

$1,508

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 April is another great option to travel to Seoul, with average flight prices from St. Louis averaging around $751.

Can stopping save me money on St. Louis to Seoul flights?

You could potentially save up to 43% 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

16h 02m

Direct flights

None
The fastest flight from St. Louis to Seoul takes 16h 02m
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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Frequently asked questions about flying from St. Louis to Seoul

  • How far is Lambert-St Louis to Seoul by plane?

    The distance between Lambert-St Louis and Seoul is about 6661.9 mi. 16h 02m 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
DeltaPriceFrom $846Free CancellationRating
7.8
8,451 reviews
Search Delta flights
United AirlinesPriceFrom $865Free CancellationRating
7.4
9,945 reviews
Search United Airlines flights
Korean AirPriceFrom $999Free CancellationRating
8.4
1,221 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