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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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ICN
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
1 adult, Economy
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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 septiembre 17, 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 South Korea
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One-way flight from Lambert-St Louis to South Korea
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Highest demand for flights based on searches. 10% potential increase in price ($140 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 septiembre 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/17. 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.
dom. 9/218:03 pmSTL - ICN
2 stops29h 27mAmerican Airlines
lun. 10/65:45 pmICN - STL
1 stop29h 06mAmerican Airlines
Deal found 9/17$828
This American Airlines deal was found by Cheapflights users on 9/17. 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.
jue. 9/185:18 amSTL - ICN
1 stop20h 12mAmerican Airlines
sáb. 10/45:25 pmICN - STL
1 stop16h 50mAmerican Airlines
Deal found 9/17$837
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.
sáb. 9/273:59 pmSTL - ICN
1 stop33h 31mAmerican Airlines
dom. 10/265:55 pmICN - STL
1 stop29h 25mAmerican Airlines
Deal found 9/16$844
This Ticket deal was found by Cheapflights users on 9/17. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/219:15 amSTL - ICN
1 stop18h 15mAir Canada
lun. 10/67:05 pmICN - STL
1 stop34h 13mAir Canada
Deal found 9/17$848
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.
vie. 10/317:01 amSTL - ICN
1 stop18h 54mAmerican Airlines
vie. 11/77:15 pmICN - STL
1 stop18h 14mAmerican Airlines
Deal found 9/16$849
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/26:00 amSTL - ICN
1 stop22h 35mAlaska Airlines
lun. 10/138:35 pmICN - STL
1 stop17h 28mAlaska Airlines
Deal found 9/16$856
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/246:00 amSTL - ICN
2 stops20h 30mDelta
dom. 11/27:40 pmICN - STL
1 stop19h 44mDelta
Deal found 9/16$861
This United Airlines deal was found by Cheapflights users on 9/17. 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.
lun. 11/104:43 pmSTL - ICN
2 stops21h 57mUnited Airlines
jue. 11/276:00 pmICN - STL
2 stops33h 39mUnited Airlines
Deal found 9/17$862
This American Airlines deal was found by Cheapflights users on 9/17. 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.
sáb. 11/16:05 pmSTL - ICN
1 stop32h 40mAmerican Airlines
sáb. 11/87:15 pmICN - STL
1 stop28h 43mAmerican Airlines
Deal found 9/17$863
This Delta deal was found by Cheapflights users on 9/17. 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.
vie. 10/245:15 pmSTL - ICN
1 stop20h 45mDelta
sáb. 11/17:30 pmICN - STL
1 stop17h 37mDelta
Deal found 9/17$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.
mié. 9/179:15 amSTL - ICN
1 stop18h 15mAir Canada
lun. 11/38:10 pmICN - STL
1 stop34h 19mAir Canada
Deal found 9/16$870
This Delta deal was found by Cheapflights users on 9/17. 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.
jue. 10/26:01 amSTL - ICN
2 stops20h 24mDelta
lun. 10/137:20 pmICN - STL
2 stops19h 04mDelta
Deal found 9/17$871

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 septiembre 17, 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

vie. 10/31

7:01 am-3:55 pm

1 stop18h 54m

Incheon Intl

vie. 11/7

7:15 pm-10:29 pm

1 stop18h 14m

$849

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

jue. 10/2

6:00 am-6:35 pm

1 stop22h 35m

Incheon Intl

lun. 10/13

8:35 pm-12:03 am

1 stop17h 28m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

vie. 10/24

6:00 am-5:20 pm

1 stop21h 20m

Incheon Intl

dom. 11/2

7:40 pm-12:24 am

1 stop19h 44m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 9/27

6:01 am-5:20 pm

2 stops21h 19m

Incheon Intl

dom. 10/26

7:25 pm-8:05 am

1 stop26h 40m

$861

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

jue. 10/2

7:16 am-3:30 pm

1 stop18h 14m

Incheon Intl

lun. 10/13

5:45 pm-11:49 pm

1 stop20h 04m

$861

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

vie. 10/31

6:00 am-4:30 pm

2 stops20h 30m

Incheon Intl

vie. 11/7

9:35 am-4:10 pm

2 stops21h 35m

$861

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

lun. 11/10

5:29 pm-5:40 am

1 stop21h 11m

Incheon Intl

jue. 11/27

6:00 pm-10:51 am

2 stops31h 51m

$862

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 11/1

4:34 pm-4:45 pm

2 stops34h 11m

Incheon Intl

sáb. 11/8

7:15 pm-8:09 am

2 stops27h 54m

$863

St. LouisDaegu

STL - TAE

STLTAE

Lambert-St Louis

jue. 2/26

6:00 am-7:45 pm

2 stops22h 45m

Daegu

lun. 3/2

7:40 am-11:40 pm

2 stops31h 00m

$1,237

St. LouisBusan

STL - PUS

STLPUS

Lambert-St Louis

jue. 2/26

7:30 am-7:30 pm

2 stops21h 00m

Busan Gimhae

lun. 3/2

10:25 am-11:40 pm

2 stops28h 15m

$1,239

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 25 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, February is the cheapest month in which you can book a flight from St. Louis to South Korea (average of $989). Flying from St. Louis to South Korea 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 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 septiembre 17, 2025.

When flying from St. Louis to South Korea, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 septiembre 17, 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
1,140 reviews

Entertainment

8.2

Food

8.1

Overall

8.4

Comfort

8.3

Crew

8.7

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
1,140 reviews
Korean Air
8.4
Very good
1,140 reviews

Entertainment

8.2

Food

8.1

Overall

8.4

Comfort

8.3

Crew

8.7

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
8.0
Very good
7,961 reviews
Korean Air
8.4
Very good
1,140 reviews

Entertainment

8.2

Food

8.1

Overall

8.4

Comfort

8.3

Crew

8.7

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
8,926 reviews
Korean Air
8.4
Very good
1,140 reviews

Entertainment

8.2

Food

8.1

Overall

8.4

Comfort

8.3

Crew

8.7

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
10,000 reviews
Korean Air
8.4
Very good
1,140 reviews

Entertainment

8.2

Food

8.1

Overall

8.4

Comfort

8.3

Crew

8.7

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
10,000 reviews
Korean Air
8.4
Very good
1,140 reviews

Entertainment

8.2

Food

8.1

Overall

8.4

Comfort

8.3

Crew

8.7

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 American Airlines, Alaska Airlines, and Delta fly from St. Louis to South Korea in about 18h 54m. The time it takes to get you to your destination can typically vary by up to 3h 41m. 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 Alaska Airlines. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $573 and $693, 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, February is the cheapest month in which you can book a flight from St. Louis to South Korea (average of $989). Flying from St. Louis to South Korea 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

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Alternative routes for St. Louis to South Korea

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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 septiembre 17, 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%

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