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St. Louis

$542+ Cheap flights from Incheon Intl (ICN) to St. Louis (STL)

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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — STL
Oct 29 — Nov 51
Wed 10/29
Wed 11/5
1 adult, Economy
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Cheap flight deals from Incheon Intl to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Incheon Intl (ICN) to St. Louis (STL). 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 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$625
(American Airlines)

One-way from

$542
(American Airlines)

Popular in

January

Cheapest in

September

Average price

$711
Provider with most accurate pricing for Incheon Intl-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Incheon Intl-Lambert-St Louis flights.
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From Incheon Intl to Lambert-St Louis
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One-way flight from Incheon Intl to Lambert-St Louis
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Highest demand for flights based on searches. 16% potential increase in price ($225 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($42 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 Incheon Intl to St. Louis

Cheapest flights from Incheon Intl to St. Louis
Explore the most affordable flight options available from Incheon Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 29, 2025.

This American Airlines deal was found by Cheapflights users on 9/28. 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 10/135:45 pmICN - STL
1 stop20h 04mAmerican Airlines
Thu 11/137:58 pmSTL - ICN
2 stops29h 47mAmerican Airlines
Deal found 9/28$625
This Delta deal was found by Cheapflights users on 9/28. 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 10/136:40 pmICN - STL
1 stop28h 11mDelta
Mon 10/202:29 pmSTL - ICN
1 stop34h 51mDelta
Deal found 9/28$628
This United Airlines deal was found by Cheapflights users on 9/28. 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 10/134:50 pmICN - STL
2 stops31h 02mUnited Airlines
Thu 11/138:20 amSTL - ICN
2 stops30h 20mUnited Airlines
Deal found 9/28$654
This American Airlines deal was found by Cheapflights users on 9/28. 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.
Wed 10/295:55 pmICN - STL
2 stops28h 14mAmerican Airlines
Sat 11/298:04 pmSTL - ICN
2 stops29h 41mAmerican Airlines
Deal found 9/28$679
This Delta deal was found by Cheapflights users on 9/28. 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.
Wed 11/127:30 pmICN - STL
1 stop31h 29mDelta
Wed 11/197:05 amSTL - ICN
1 stop19h 40mDelta
Deal found 9/28$712
This Priceline deal was found by Cheapflights users on 9/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/137:30 pmICN - STL
1 stop18h 53mKorean Air
Thu 11/206:34 amSTL - ICN
1 stop18h 46mKorean Air
Deal found 9/29$835
This American Airlines deal was found by Cheapflights users on 9/29. 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 11/137:15 pmICN - STL
2 stops27h 54mAmerican Airlines
Thu 11/205:17 amSTL - ICN
1 stop20h 28mAmerican Airlines
Deal found 9/29$962
This Air Canada deal was found by Cheapflights users on 9/28. 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 10/295:55 pmICN - STL
3 stops35h 51mMultiple Airlines
Sat 11/294:05 pmSTL - ICN
2 stops34h 05mMultiple Airlines
Deal found 9/28$1,137

Cheapflights Fare Finder

 
Customize your flight search to find flights from Incheon Intl to St. Louis 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 29, 2025.
Use the filters below to find and compare flights from Incheon Intl Airport to St. Louis that are best for you.

Fly from

Incheon Intl

Fly to

St. Louis

Route

Depart

Return

Price

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 10/13

5:45 pm-11:49 pm

1 stop20h 04m

Lambert-St Louis

Thu 11/13

7:58 pm-4:45 pm

2 stops29h 47m

$625

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 10/13

6:40 pm-8:51 am

1 stop28h 11m

Lambert-St Louis

Mon 10/20

2:29 pm-3:20 pm

1 stop34h 51m

$628

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 10/13

4:50 pm-9:52 am

2 stops31h 02m

Lambert-St Louis

Thu 11/13

8:20 am-5:40 am

2 stops30h 20m

$654

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Wed 10/29

5:55 pm-8:09 am

2 stops28h 14m

Lambert-St Louis

Sat 11/29

8:04 pm-4:45 pm

2 stops29h 41m

$679

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 3/23

9:00 pm-11:55 pm

1 stop16h 55m

Lambert-St Louis

Fri 3/27

2:55 pm-4:20 am

1 stop23h 25m

$689

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Wed 11/12

4:10 pm-6:57 pm

2 stops17h 47m

Lambert-St Louis

Wed 11/19

7:05 am-5:45 pm

1 stop19h 40m

$712

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 2/12

7:30 pm-11:10 pm

1 stop18h 40m

Lambert-St Louis

Mon 2/16

7:00 am-4:20 pm

1 stop18h 20m

$734

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Wed 10/29

5:55 pm-9:20 am

1 stop29h 25m

$542

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Wed 10/29

6:55 pm-11:59 pm

2 stops43h 04m

$558

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/28

Compare providers for flights from Incheon Intl to St. Louis

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 Incheon Intl to St. Louis in September.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy2 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 Incheon Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Incheon Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Incheon Intl Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Incheon Intl Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub 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 Incheon Intl Airport-St. Louis 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 Incheon Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Incheon Intl 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 Incheon Intl Airport to St. Louis

How much does it cost to fly round-trip from Incheon Intl Airport to St. Louis?

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated September 29, 2025.
Get a feel of what it's like to fly with Delta from Incheon Intl Airport to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,964 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others
Delta
8.0
Very good
7,964 reviews
Delta
8.0
Very good
7,964 reviews

Comfort

7.9

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
6.0
Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

Related info for your journey

Find useful and relevant information for your journey from Incheon Intl to St. Louis. 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 into for flights to St. Louis from Incheon Intl?

    Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Incheon Intl. On average, Lambert-St Louis has 0 inbound flights from Incheon Intl per day from 1 airline. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from Incheon Intl Airport to St. Louis?

    For as low as $625, American Airlines can have you in St. Louis from Incheon Intl Airport in 20h 04m. Incheon Intl Airport and St. Louis 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 is the cheapest airline to fly from Incheon Intl Airport to St. Louis round-trip?

    Flying on Delta is currently your cheapest option to St. Louis, with prices starting at $663. This flight start at 40% lower than the current average price 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Incheon Intl to St. Louis 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 Incheon Intl Airport to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Incheon Intl Airport to St. Louis (average of $311). Flying from Incheon Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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Alternative routes for Incheon Intl to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Incheon Intl to St. Louis

Discover the top airline that operate flights from Incheon Intl to St. Louis. 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 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$663Average$926FlexibilityNo cancel feeOn-timeN/A

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