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Incheon Intl

$563+ Cheap flights from St. Louis (STL) to Incheon Intl (ICN)

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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ICN
May 5 — May 121
Mon 5/5
Mon 5/12
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Incheon Intl are usually found in January or February, booked 10 days in advance, depart on a Wednesday or Sunday and return on a Wednesday

Cheap flight deals from St. Louis to Incheon Intl

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Incheon Intl (ICN). 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 April 30, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,160
(United Airlines)

One-way from

$563
(United Airlines)

Popular in

July

Cheapest in

January

Average price

$1,162
Provider with most accurate pricing for Lambert-St Louis-Incheon Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Incheon Intl flights.
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From Lambert-St Louis to Incheon Intl
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One-way flight from Lambert-St Louis to Incheon Intl
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Highest demand for flights based on searches. 17% potential increase in price ($290 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($48 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find flight deals from St. Louis to Incheon Intl

Cheapest flights from St. Louis to Incheon Intl
Explore the most affordable flight options available from St. Louis to Incheon Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.

This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/107:05 amSTL - ICN
1 stop31h 35mUnited Airlines
Thu 11/2712:45 pmICN - STL
1 stop19h 18mUnited Airlines
Deal found 4/29$993
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/105:45 pmSTL - ICN
2 stops30h 45mDelta
Thu 11/279:35 amICN - STL
2 stops23h 27mDelta
Deal found 4/29$1,060
This Hawaiian Airlines deal was found by Cheapflights users on 4/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/163:17 pmSTL - ICN
1 stop37h 18mHawaiian Airlines
Fri 9/198:35 pmICN - STL
1 stop17h 24mHawaiian Airlines
Deal found 4/28$1,083
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/142:55 pmSTL - ICN
1 stop37h 40mAlaska Airlines
Fri 10/178:35 pmICN - STL
1 stop17h 21mAlaska Airlines
Deal found 4/29$1,161
This Air Canada deal was found by Cheapflights users on 4/28. 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.
Tue 9/164:05 pmSTL - ICN
2 stops34h 00mAir Canada
Fri 9/196:00 pmICN - STL
1 stop39h 57mAir Canada
Deal found 4/28$1,178
This EVA Air deal was found by Cheapflights users on 4/28. 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 EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/16:30 pmSTL - ICN
2 stops26h 30mMultiple Airlines
Tue 9/307:45 pmICN - STL
2 stops32h 54mMultiple Airlines
Deal found 4/28$1,259
This Fareboom deal was found by Cheapflights users on 4/29. 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 Fareboom is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/142:55 pmSTL - ICN
2 stops30h 05mEVA Air
Fri 10/177:45 pmICN - STL
2 stops32h 07mEVA Air
Deal found 4/29$1,294
This oojo deal was found by Cheapflights users on 4/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/110:08 amSTL - ICN
2 stops40h 57mQatar Airways
Wed 9/31:20 amICN - STL
2 stops36h 39mQatar Airways
Deal found 4/29$1,746
This Korean Air deal was found by Cheapflights users on 4/29. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/236:00 amSTL - ICN
1 stop18h 10mKorean Air
Tue 7/297:40 pmICN - STL
1 stop18h 58mKorean Air
Deal found 4/29$1,806
This Jetabroad deal was found by Cheapflights users on 4/29. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/306:30 amSTL - ICN
2 stops22h 15mWestJet
Sun 8/38:45 pmICN - STL
2 stops26h 56mWestJet
Deal found 4/29$1,818

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Incheon Intl 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 April 30, 2025.
Use the filters below to find and compare flights from St. Louis to Incheon Intl Airport that are best for you.

Fly from

St. Louis

Fly to

Incheon Intl

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 7/7

6:00 am-3:00 pm

1 stop19h 00m

Incheon Intl

Wed 7/16

4:50 pm-4:54 am

1 stop26h 04m

$1,160

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 7/5

5:00 pm-3:20 pm

1 stop32h 20m

Incheon Intl

Wed 7/9

10:15 am-5:08 pm

1 stop20h 53m

$1,410

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 7/5

1:30 pm-4:05 pm

2 stops36h 35m

Incheon Intl

Wed 7/9

6:00 pm-8:00 pm

1 stop40h 00m

$1,497

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 5/13

6:30 am-11:00 am

2 stops38h 30m

Incheon Intl

Mon 5/19

6:20 pm-2:07 pm

1 stop33h 47m

$1,506

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 7/23

6:00 am-2:10 pm

1 stop18h 10m

Incheon Intl

Tue 7/29

7:40 pm-12:38 am

1 stop18h 58m

$1,806

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 5/21

10:05 am-6:45 pm

2 stops42h 40m

Incheon Intl

Sat 6/14

8:45 pm-4:50 pm

2 stops34h 05m

$1,825

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 7/5

7:32 pm-5:05 pm

2 stops55h 33m

Incheon Intl

Sun 7/20

1:20 am-6:33 pm

2 stops55h 13m

$1,939

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 7/12

7:32 pm-7:00 pm

2 stops33h 28m

Incheon Intl

Mon 7/14

9:25 pm-11:59 pm

2 stops40h 34m

$2,138

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 7/6

8:00 am-5:40 pm

2 stops43h 40m

Incheon Intl

Sat 7/19

10:20 am-10:45 pm

2 stops50h 25m

$2,525

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 7/3

6:00 am-3:00 pm

1 stop19h 00m

$563

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 14 results
1
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Compare providers for flights from St. Louis to Incheon Intl

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 Incheon Intl in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice 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-Incheon Intl Airport flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-Incheon Intl Airport flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from St. Louis-Incheon Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Incheon Intl Airport flights, Cheapflights users trust AranGrant the most. AranGrant 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-Incheon Intl Airport 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 Incheon Intl

Have a flexible travel schedule? Discover the best time to fly to Incheon Intl 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 Incheon Intl Airport

How far ahead should I book a flight from St. Louis to Incheon Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Incheon Intl. Price data was last updated on April 25, 2025.

Booking 9 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Incheon Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Incheon Intl Airport?

Currently, February is the cheapest month in which you can book a flight from St. Louis to Incheon Intl Airport (average of $1,001). Flying from St. Louis to Incheon Intl Airport in December is currently the most expensive (average of $1,635). 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 ICN?

Find hourly flight availability from St. Louis to Incheon Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 30, 2025.

A simple way to save on the total cost of your ticket is to fly from St. Louis to Incheon Intl Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight at noon.

Rainfall in Incheon Intl by month

Plan your trip to Incheon Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Incheon Intl Airport ranges from 0.8 - 10.2 inches per month. July is typically the wettest month, when rainfall can reach 10.2 in. January is typically the driest time to visit Incheon Intl Airport when rainfall is around 0.8 in.

Temperature in Incheon Intl by month

Plan your trip to Incheon Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Incheon Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 28.4 F).

Reviews of airlines servicing Incheon Intl

Get insights into the airlines that provide service to Incheon Intl. 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 Incheon Intl. Reviews last updated April 30, 2025.
Korean Air
8.4
Very good
1,066 reviews

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

Food

8.1

Comfort

8.3

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
1,066 reviews
Korean Air
8.4
Very good
1,066 reviews

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

Food

8.1

Comfort

8.3

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.
China Airlines
8.3
Very good
732 reviews
Korean Air
8.4
Very good
1,066 reviews

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

Food

8.1

Comfort

8.3

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.
Alaska Airlines
8.0
Very good
9,968 reviews
Korean Air
8.4
Very good
1,066 reviews

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

Food

8.1

Comfort

8.3

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
7,936 reviews
Korean Air
8.4
Very good
1,066 reviews

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

Food

8.1

Comfort

8.3

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.
Qatar Airways
7.4
Good
3,563 reviews
Korean Air
8.4
Very good
1,066 reviews

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

Food

8.1

Comfort

8.3

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 Incheon Intl. 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 Incheon Intl?

    For a flight from St. Louis to Incheon Intl, 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 Incheon Intl per day. 5 airlines have flights to Incheon Intl from Lambert-St Louis on a regular basis.

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

    United Airlines, at $1,160, was found to be the cheapest airline from St. Louis to Incheon Intl Airport.Alternate airlines to your destination round-trip include Delta and Air Canada. Users have found that United Airlines is 15% cheaper than the other options available to this destination.

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

    $563 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on WestJet and Air Canada, with prices starting from $742 and $747, respectively.

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

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

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

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

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

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

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Incheon Intl Airport (average of $1,001). Flying from St. Louis to Incheon Intl Airport in December is currently the most expensive (average of $1,635). 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
Suwon
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Alternative routes for St. Louis to Incheon Intl

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 Incheon Intl

Discover the top 5 airlines that operate flights from St. Louis to Incheon Intl. 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$799Average$1,076FlexibilityNo cancel feeOn-time67%
DeltaCheapest$902Average$1,679FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$902Average$1,532FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$996Average$1,611FlexibilityNo cancel feeOn-time71%
Korean AirCheapest$1,080Average$1,887FlexibilityNo cancel feeOn-time81%

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