HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seoul

$433+ Cheap flights from St. Louis (STL) to Seoul (SEL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEL
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Seoul with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from St. Louis to Seoul

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Seoul (SEL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 16, 2025.

Round-trip from

$844
(American Airlines)

One-way from

$433
(Alaska Airlines)

Popular in

August

Cheapest in

October

Average price

$911
From Lambert-St Louis to Seoul (SEL)
Search Deals
One-way flight from Lambert-St Louis to Seoul (SEL)
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($140 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from St. Louis to Seoul

Cheapest flights from St. Louis to Seoul
Explore the most affordable flight options available from St. Louis to Seoul. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/273:59 pmSTL - ICN
1 stop33h 31mAmerican Airlines
Sun 10/265:55 pmICN - STL
1 stop29h 25mAmerican Airlines
Deal found 9/15$844
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/317:00 pmSTL - ICN
2 stops31h 45mAmerican Airlines
Fri 11/77:15 pmICN - STL
1 stop18h 14mAmerican Airlines
Deal found 9/16$849
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:50 amSTL - ICN
1 stop18h 30mDelta
Sat 11/17:30 pmICN - STL
1 stop17h 37mDelta
Deal found 9/15$856
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/107:58 pmSTL - ICN
2 stops29h 47mAmerican Airlines
Thu 11/277:15 pmICN - STL
1 stop30h 24mAmerican Airlines
Deal found 9/14$857
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:00 amSTL - ICN
2 stops20h 30mDelta
Sun 11/27:40 pmICN - STL
1 stop19h 44mDelta
Deal found 9/15$861
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:00 amSTL - ICN
2 stops20h 30mDelta
Mon 10/136:40 pmICN - STL
1 stop18h 27mDelta
Deal found 9/15$866
This Air Canada deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/179:15 amSTL - ICN
1 stop18h 15mAir Canada
Mon 11/38:10 pmICN - STL
1 stop34h 19mAir Canada
Deal found 9/16$870
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:09 pmSTL - ICN
2 stops30h 21mDelta
Thu 11/279:35 amICN - STL
2 stops24h 00mDelta
Deal found 9/15$871
This Trip.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/196:00 amSTL - ICN
1 stop22h 35mMultiple Airlines
Sun 9/216:20 pmICN - STL
2 stops34h 44mMultiple Airlines
Deal found 9/15$910
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/127:52 pmSTL - ICN
2 stops42h 58mMultiple Airlines
Sun 11/99:00 pmICN - STL
1 stop17h 59mMultiple Airlines
Deal found 9/14$918
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/245:15 amSTL - ICN
2 stops33h 05mUnited Airlines
Sun 11/212:45 pmICN - STL
2 stops24h 09mUnited Airlines
Deal found 9/15$941
This Expedia deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:39 amSTL - GMP
2 stops25h 26mJapan Airlines
Thu 11/612:05 pmGMP - STL
2 stops26h 37mJapan Airlines
Deal found 9/15$1,045

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from St. Louis to Seoul that are best for you.

Fly from

St. Louis

Fly to

Seoul

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/31

7:01 am-3:55 pm

1 stop18h 54m

Incheon Intl

Fri 11/7

7:15 pm-10:29 pm

1 stop18h 14m

$849

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

6:00 am-5:20 pm

1 stop21h 20m

Incheon Intl

Sat 11/1

7:30 pm-11:07 pm

1 stop17h 37m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 10/29

1:35 pm-4:40 am

2 stops25h 05m

Incheon Intl

Wed 11/5

12:45 pm-4:27 pm

1 stop18h 42m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 2/19

7:00 am-6:35 pm

1 stop20h 35m

Incheon Intl

Fri 2/27

8:35 pm-11:56 pm

1 stop18h 21m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 9/27

6:40 am-4:25 pm

1 stop19h 45m

Incheon Intl

Sun 10/26

7:25 pm-11:41 pm

1 stop18h 16m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 10/30

5:24 pm-4:40 am

2 stops21h 16m

Incheon Intl

Thu 11/6

12:45 pm-4:27 pm

1 stop18h 42m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 10/2

6:00 am-6:35 pm

1 stop22h 35m

Incheon Intl

Mon 10/13

8:35 pm-12:03 am

1 stop17h 28m

$856

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. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Thu 10/30

6:39 am-10:05 pm

2 stops25h 26m

Seoul Gimpo Intl

Thu 11/6

12:05 pm-11:42 pm

2 stops26h 37m

$1,045

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 12/16

6:55 am-10:05 pm

2 stops24h 10m

Seoul Gimpo Intl

Sun 1/11

7:40 pm-11:08 am

2 stops30h 28m

$1,699

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 25 results
1
2
3

Best time to book a flight from St. Louis to Seoul

Have a flexible travel schedule? Discover the best time to fly to Seoul from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Seoul

What is the cheapest month to book a flight from St. Louis to Seoul?

Currently, February is the cheapest month in which you can book a flight from St. Louis to Seoul (average of $989). Flying from St. Louis to Seoul in December is currently the most expensive (average of $1,621). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to SEL?

Find hourly flight availability from St. Louis to Seoul. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 23% on flights from St. Louis to Seoul by exploring options for tickets at noon.

Reviews of airlines servicing Seoul

Get insights into the airlines that provide service to Seoul. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seoul. Reviews last updated September 16, 2025.
Read reviews from past customers who have flown Korean Air, Delta, and United Airlines from St. Louis to Seoul. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,140 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Entertainment

8.2

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Korean Air
8.4
Very good
1,140 reviews
Korean Air
8.4
Very good
1,140 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Entertainment

8.2

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Delta
8.0
Very good
7,957 reviews
Korean Air
8.4
Very good
1,140 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Entertainment

8.2

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
United Airlines
7.4
Good
8,924 reviews
Korean Air
8.4
Very good
1,140 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Entertainment

8.2

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
American Airlines
7.2
Good
10,000 reviews
Korean Air
8.4
Very good
1,140 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Entertainment

8.2

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.
Air Canada
7.1
Good
10,000 reviews
Korean Air
8.4
Very good
1,140 reviews

Comfort

8.3

Overall

8.4

Boarding

8.5

Entertainment

8.2

Food

8.1

Crew

8.7

Reviews

1 / 20
10.0
Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Seoul. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Seoul?

    For a flight from St. Louis to Seoul, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 0 outbound flights to Seoul per day. 5 airlines have flights to Seoul from Lambert-St Louis on a regular basis.

  • How long is the flight from St. Louis to Seoul?

    For as low as $849, American Airlines can have you in Seoul from St. Louis in 18h 54m. The distance from St. Louis to Seoul is about 6670 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from St. Louis to Seoul round-trip?

    Air Canada, at $799, was found to be the cheapest airline from St. Louis to Seoul.Alternate airlines to your destination round-trip include Delta and American Airlines. These flights start at 29% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Seoul one-way?

    To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $433. United Airlines flights start at $448 while deals on Air Canada start at $572 one-way.

  • Can I find deals for flights from St. Louis to Seoul that include hotel bookings?

    Yes. In addition to deals on St. Louis to Seoul flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Seoul?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Seoul.

  • Can I find deals for business class flights from St. Louis to Seoul?

    Yes. Cheapflights offers flight deals from St. Louis to Seoul by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Seoul?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Seoul (average of $989). Flying from St. Louis to Seoul in December is currently the most expensive (average of $1,621). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 5 airlines flying from St. Louis to Seoul

Discover the top 5 airlines that operate flights from St. Louis to Seoul. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$799Average$1,083FlexibilityNo cancel feeOn-time67%
DeltaCheapest$866Average$1,374FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$902Average$1,846FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$902Average$1,635FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$1,057Average$1,889FlexibilityNo cancel feeOn-time81%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.