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 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEL
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
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 November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$759
(Expedia)

One-way from

$433
(American Airlines)

Popular in

August

Cheapest in

October

Average price

$1,068
Provider with most accurate pricing for Lambert-St Louis-Seoul (SEL) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Seoul (SEL) flights.
Search Deals
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. 11% potential increase in price ($151 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 3, 2025.

This American Airlines deal was found by Cheapflights users on 11/3. 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 11/107:00 amSTL - ICN
1 stop18h 45mAmerican Airlines
Thu 11/277:15 pmICN - STL
1 stop30h 24mAmerican Airlines
Deal found 11/3$838
This American Airlines deal was found by Cheapflights users on 11/2. 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.
Thu 11/135:17 amSTL - ICN
1 stop20h 28mAmerican Airlines
Thu 11/207:15 pmICN - STL
1 stop18h 19mAmerican Airlines
Deal found 11/2$846
This American Airlines deal was found by Cheapflights users on 11/2. 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.
Sun 11/167:00 amSTL - ICN
1 stop18h 45mAmerican Airlines
Sun 11/237:15 pmICN - STL
1 stop18h 19mAmerican Airlines
Deal found 11/2$856
This United Airlines deal was found by Cheapflights users on 11/2. 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.
Mon 11/101:35 pmSTL - ICN
2 stops25h 05mUnited Airlines
Thu 11/2712:45 pmICN - STL
2 stops48h 09mUnited Airlines
Deal found 11/2$859
This American Airlines deal was found by Cheapflights users on 11/1. 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.
Tue 11/47:00 amSTL - ICN
1 stop18h 45mAmerican Airlines
Thu 11/67:15 pmICN - STL
1 stop28h 40mAmerican Airlines
Deal found 11/1$862
This Alaska Airlines deal was found by Cheapflights users on 11/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/27:00 amSTL - ICN
1 stop20h 35mAlaska Airlines
Sun 11/98:35 pmICN - STL
1 stop18h 24mAlaska Airlines
Deal found 11/1$866
This Delta deal was found by Cheapflights users on 11/1. 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.
Sun 11/23:59 pmSTL - ICN
1 stop22h 46mDelta
Sun 11/97:30 pmICN - STL
2 stops19h 14mDelta
Deal found 11/1$871
This United Airlines deal was found by Cheapflights users on 11/1. 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.
Tue 11/411:05 amSTL - ICN
2 stops27h 35mUnited Airlines
Thu 11/66:00 pmICN - STL
1 stop37h 27mUnited Airlines
Deal found 11/1$878
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Thu 11/61:35 pmSTL - ICN
2 stops25h 05mUnited Airlines
Sat 11/86:00 pmICN - STL
2 stops31h 51mUnited Airlines
Deal found 11/3$883
This Ovago deal was found by Cheapflights users on 11/2. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:55 amSTL - GMP
2 stops24h 10mJapan Airlines
Wed 12/1712:05 pmGMP - STL
2 stops26h 52mJapan Airlines
Deal found 11/2$1,226
This FlightHub deal was found by Cheapflights users on 11/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/107:00 amSTL - GMP
2 stops24h 05mJapan Airlines
Mon 1/198:00 amGMP - STL
2 stops30h 59mJapan Airlines
Deal found 11/1$1,231
This Japan Airlines deal was found by Cheapflights users on 11/1. 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 Japan Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/166:55 amSTL - GMP
2 stops24h 10mMultiple Airlines
Tue 12/238:00 amGMP - STL
2 stops22h 00mMultiple Airlines
Deal found 11/1$1,885

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 November 3, 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

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

Fri 3/27

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

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

Mon 2/16

6:48 pm-3:30 pm

2 stops29h 42m

Incheon Intl

Sun 3/1

7:30 pm-11:25 pm

1 stop18h 55m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 4/14

2:55 pm-6:35 pm

1 stop37h 40m

Incheon Intl

Fri 4/24

8:35 pm-11:55 pm

1 stop17h 20m

$852

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 3/28

10:00 am-4:00 am

1 stop28h 00m

Incheon Intl

Fri 4/10

7:40 pm-12:37 am

1 stop18h 57m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 3/31

7:06 pm-4:20 am

1 stop19h 14m

Incheon Intl

Thu 4/9

11:30 am-5:53 pm

1 stop20h 23m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 3/12

6:30 am-3:30 pm

1 stop19h 00m

Incheon Intl

Sun 3/22

7:40 pm-12:37 am

1 stop18h 57m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 4/26

8:50 am-5:20 pm

1 stop18h 30m

Incheon Intl

Wed 4/29

6:40 pm-11:01 pm

1 stop18h 21m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 11/22

6:34 am-4:20 pm

1 stop18h 46m

Incheon Intl

Sat 12/6

7:30 pm-11:27 pm

1 stop18h 57m

$866

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 35 results
1
2
3
4

Compare providers for flights from St. Louis to Seoul

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Seoul in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Seoul flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Seoul flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Seoul flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Seoul flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Seoul flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, April is the cheapest month in which you can book a flight from St. Louis to Seoul (average of $727). Flying from St. Louis to Seoul in July is currently the most expensive (average of $1,285). 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 November 3, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 13% on flights from St. Louis to Seoul by exploring options for tickets in the afternoon.

How much does it cost to fly round-trip from St. Louis to Seoul?

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 November 3, 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
1,158 reviews

Entertainment

8.2

Crew

8.7

Boarding

8.5

Food

8.1

Comfort

8.3

Overall

8.4

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
1,158 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Crew

8.7

Boarding

8.5

Food

8.1

Comfort

8.3

Overall

8.4

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
7.9
Good
8,001 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Crew

8.7

Boarding

8.5

Food

8.1

Comfort

8.3

Overall

8.4

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
8,996 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Crew

8.7

Boarding

8.5

Food

8.1

Comfort

8.3

Overall

8.4

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
11,035 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Crew

8.7

Boarding

8.5

Food

8.1

Comfort

8.3

Overall

8.4

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
10,394 reviews
Korean Air
8.4
Very good
1,158 reviews

Entertainment

8.2

Crew

8.7

Boarding

8.5

Food

8.1

Comfort

8.3

Overall

8.4

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 $846, Alaska Airlines can have you in Seoul from St. Louis in 25h 25m. 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 American Airlines and Delta. These flights start at 28% 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 American Airlines, which is currently one of the cheapest options available, starting at $433. Japan Airlines flights start at $433 while deals on United Airlines start at $448 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, April is the cheapest month in which you can book a flight from St. Louis to Seoul (average of $727). Flying from St. Louis to Seoul in July is currently the most expensive (average of $1,285). 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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$799Average$1,102FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$846Average$1,846FlexibilityNo cancel feeOn-time71%
DeltaCheapest$846Average$1,042FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$902Average$1,842FlexibilityNo 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.