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$433+ Cheap flights from St. Louis (STL) to South Korea

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 — ICN
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Find flight deals from St. Louis to South Korea

Cheapest flights from St. Louis to South Korea
Explore the most affordable flight options available from St. Louis to South Korea. 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

Cheap flight deals from St. Louis to South Korea

Keep the following information in mind while searching for St. Louis to South Korea flight deals. Data was 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 South Korea
Search Deals
One-way flight from Lambert-St Louis to South Korea
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

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to South Korea 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 South Korea that are best for you.

Fly from

St. Louis

Fly to

South Korea

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 37 results
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Best time to book a flight from St. Louis to South Korea

Have a flexible travel schedule? Discover the best time to fly to South Korea 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 South Korea

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

Currently, April is the cheapest month in which you can book a flight from St. Louis to South Korea (average of $727). Flying from St. Louis to South Korea 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 KR?

Find hourly flight availability from St. Louis to South Korea. 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.

It’s optimal to fly from St. Louis to South Korea in the evening. By choosing this option you can save up to 49% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from St. Louis to South Korea?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to South Korea. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to South Korea flight should consider departing on Wednesday evenings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing South Korea

Get insights into the airlines that provide service to South Korea. 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 South Korea. Reviews last updated November 3, 2025.
Get a feel of what it's like to fly with Korean Air, Delta, and United Airlines from St. Louis to South Korea by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,158 reviews

Crew

8.7

Comfort

8.3

Overall

8.4

Entertainment

8.2

Food

8.1

Boarding

8.5

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

Crew

8.7

Comfort

8.3

Overall

8.4

Entertainment

8.2

Food

8.1

Boarding

8.5

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

Crew

8.7

Comfort

8.3

Overall

8.4

Entertainment

8.2

Food

8.1

Boarding

8.5

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

Crew

8.7

Comfort

8.3

Overall

8.4

Entertainment

8.2

Food

8.1

Boarding

8.5

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

Crew

8.7

Comfort

8.3

Overall

8.4

Entertainment

8.2

Food

8.1

Boarding

8.5

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

Crew

8.7

Comfort

8.3

Overall

8.4

Entertainment

8.2

Food

8.1

Boarding

8.5

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 South Korea. 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 South Korea?

    If you book a flight to South Korea from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis.

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

    Airlines like Alaska Airlines, United Airlines, and Delta fly from St. Louis to South Korea in about 25h 25m. The time it takes to get you to your destination can typically vary by up to 11h 20m. St. Louis and South Korea are separated by a distance of 6670 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $433 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Japan Airlines and United Airlines, with prices starting from $433 and $448, respectively.

  • What are the most popular routes from St. Louis to South Korea?

    When deciding which route to take from St. Louis to South Korea consider Lambert-St Louis - Incheon Intl, Lambert-St Louis - Seoul Gimpo Intl or Lambert-St Louis - Busan Gimhae as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to South Korea 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 South Korea?

    Currently, April is the cheapest month in which you can book a flight from St. Louis to South Korea (average of $727). Flying from St. Louis to South Korea 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

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Alternative routes for St. Louis to South Korea

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from St. Louis to South Korea

Discover the top 5 airlines that operate flights from St. Louis to South Korea. 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%

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