ICN - STL

$647 Find Cheap Flights from Seoul Incheon Airport to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Incheon Intl to St. Louis departing on 12/19. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Incheon to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Incheon to St. Louis, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$647
Typical prices: $852-$927
United Airlines
Tue 4/14Tue 4/21
ICN - STL • 1 stop
Cheapest one-way
$448
Typical prices: $512-$918
Multiple Airlines
Fri 12/19
ICN - STL • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Incheon Intl to St. Louis (ICN-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Incheon Intl to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Incheon Intl to St. Louis

Tue, Apr 14 - Tue, Apr 21
United Airlines Logo
4:50 pm - 5:52 amICN-STL
27h 02m1 stop
United Airlines Logo
7:06 pm - 4:20 amSTL-ICN
19h 14m1 stop
$647United Airlines
Find Deal
Tue, Apr 14 - Tue, Apr 21
United Airlines Logo
11:30 am - 6:22 pmICN-STL
20h 52m1 stop
United Airlines Logo
7:06 pm - 4:20 amSTL-ICN
19h 14m1 stop
$650United Airlines
Find Deal
Tue, Apr 14 - Tue, Apr 21
United Airlines Logo
11:30 am - 4:52 pmICN-STL
19h 22m2 stops
United Airlines Logo
2:50 pm - 4:20 amSTL-ICN
23h 30m2 stops
$651United Airlines
Find Deal
Tue, Apr 14 - Tue, Apr 21
United Airlines Logo
11:30 am - 4:52 pmICN-STL
19h 22m2 stops
United Airlines Logo
1:14 pm - 4:20 amSTL-ICN
25h 06m2 stops
$654United Airlines
Find Deal
Mon, Apr 13 - Fri, Apr 24
Multiple Airlines Logo
9:00 pm - 11:55 pmICN-STL
16h 55m1 stop
Multiple Airlines Logo
2:55 pm - 4:20 amSTL-ICN
23h 25m1 stop
$664Multiple Airlines
Find Deal
Mon, Apr 13 - Fri, Apr 24
Multiple Airlines Logo
8:40 pm - 4:52 pmICN-STL
34h 12m2 stops
Multiple Airlines Logo
6:02 pm - 4:20 amSTL-ICN
20h 18m2 stops
$677Multiple Airlines
Find Deal
Mon, Apr 13 - Sun, Apr 19
Multiple Airlines Logo
9:00 pm - 11:55 pmICN-STL
16h 55m1 stop
Multiple Airlines Logo
2:55 pm - 4:20 amSTL-ICN
23h 25m1 stop
$684Multiple Airlines
Find Deal
Mon, Apr 13 - Sun, Apr 19
Multiple Airlines Logo
8:40 pm - 5:52 amICN-STL
23h 12m1 stop
Multiple Airlines Logo
2:55 pm - 4:20 amSTL-ICN
23h 25m1 stop
$701Multiple Airlines
Find Deal
Mon, Apr 13 - Fri, Apr 24
American Airlines Logo
5:25 pm - 8:55 amICN-STL
29h 30m1 stop
American Airlines Logo
5:34 am - 3:30 pmSTL-ICN
19h 56m1 stop
$739American Airlines
Find Deal
Tue, Jan 27 - Thu, Jan 29
United Airlines Logo
12:45 pm - 3:37 pmICN-STL
17h 52m1 stop
United Airlines Logo
9:57 am - 5:40 amSTL-ICN
28h 43m2 stops
$776United Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Incheon Intl to St. Louis flights

Get data-powered insights and trends into flights from Incheon Intl to St. Louis to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Incheon Intl Airport to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Incheon Intl Airport to St. Louis departing in April.

What’s the cheapest day of the week to fly from Seoul Incheon Airport to St. Louis?

The average price of all round-trip flights from Incheon Intl Airport to St. Louis clicked on KAYAK for each day over the last 12 months.

For Seoul Incheon Airport to St. Louis, Thursday is the cheapest day to fly on average and Saturday is the most expensive. Flying from St. Louis back to Seoul Incheon Airport, the best deals are generally found on Wednesday, with Friday being the most expensive.

Good to know

Low seasonNovember
Cheapest flight$448
Best time to beat the crowds with an average 47% drop in price.
Most popular time to fly with an average 39% increase in price.
Flight from Seoul Incheon Airport to St. Louis

When to book flights from Incheon Intl to St. Louis

Are your dates flexible? Find out the best times to travel from Incheon Intl to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Seoul Incheon Airport to St. Louis flights

  • What is the cheapest flight from Incheon Intl Airport to St. Louis?

    In the last 3 days, the lowest price for a flight from Incheon Intl Airport to St. Louis was $658 for a one-way ticket and $647 for a round-trip.

  • Do I need a passport to fly between Seoul Incheon Airport and St. Louis?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Seoul Incheon Airport and on arrival in St. Louis.

  • Which aircraft models fly most regularly from Seoul Incheon Airport to St. Louis?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seoul Incheon Airport to St. Louis?

    oneworld, and SkyTeam are the airline alliances operating flights between Seoul Incheon Airport and St. Louis, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Incheon to St. Louis, Delta or American Airlines?

    The two airlines most popular with KAYAK users for flights from Incheon to St. Louis are Delta and American Airlines. With an average price for the route of $926 and an overall rating of 7.9, Delta is the most popular choice. American Airlines is also a great choice for the route, with an average price of $1,552 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Seoul Incheon Airport to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seoul Incheon Airport to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seoul Incheon Airport to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Seoul Incheon Airport is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seoul Incheon Airport to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Seoul Incheon Airport with another airline. Booking your flights between Seoul Incheon Airport and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seoul Incheon Airport to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Seoul Incheon Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Incheon Intl to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Incheon to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Incheon Intl to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8010 reviews
8.5Crew
7.9Comfort
7.3Food
8.1Boarding
7.9Entertainment
Airline reviews

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

8.0 ExcellentDeborah, Nov 2025LAX - RDU
Read more Delta reviews

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

We had a lot of really rough weather but that was not Delta's fault. Pilot was amazing.

One of the best airlines that I flew on, the flight attendants were very attentive and professional.

First, Delta needs more flights to/from Miami. Second, a 1000pm leaving at 1230pm is unacceptable from their biggest airport world hub. Another aircraft could have been used such as the aircraft scheduled to be used in the morning for that exact same route. Yes, I did get me there but the lack of sleep the next day didn't help me enjoy my entire trip since I was busy with activities during the weekend. This can be and is expected from Spirit (going bankrupt) and Frontier (despite they're nickel and dimers). But from Delta's World Hub? That's totally unacceptable!

This flight was straightforward and without difficulty. Service was OK, but I continue to be underwhelmed by level of attention given to Sky Priority passengers.

It would’ve been nice for all that money to have a more substantial snack for free. I remember once upon a time getting a very nice turkey sandwich with Swiss cheese on whole wheat bread for no charge along with a drink. I guess those days are gone. it’s a little insulting being given a cookie or a bag of baked chips Going forward I’ll just bring my own.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Service in business class was not impressive. I ordered coffee with dinner and then watched other people get 2 refills before I got my 1 cup of coffee, and only after I pressed the attendant button overhead. Furthermore, the seats in the forward cabin need maintenance on this 737-800: the upholstery is detaching from the seat frame, at least on the backs of seats 1C, 1D.

The ticket agents in West Palm Beach on Friday afternoon Nov. 7th were incredible in getting us on an earlier plane to Atlanta during the government shutdown. Had the taken our original flight we would have missed our connection. She did this on her own, We didn't even have to ask, and she did it all with a smile and showing genuine concern that we would be taken care of. We are very grateful and thankful. We fly often, and now we will be sure to fly Delta.

the over had ligth did not work'd for the all way

The flight was delayed multiple times, again no fault of American but again the extra cost, for everything makes it feel like a cheap airline! Especially when flights are outrageously expensive already

The inflight staff is never the issue always the extra and charges american charges! Literally 30 bucks for WiFi! Is insane and then it’s choppy and slow. If you pay for it once you don’t need to pay again for switching aircraft especially when there is flight delays

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

I had a positive experience on American. I'm blind and traveling with a guide dog and the flight attendants were so kind, friendly, and helpful towards us. They checked in on us during the flight and they made us feel comfortable and welcomed. There was an hour delay before depature, but overall the flight was a smooth ride. I appreciate that there were no issues on this long flight back home.

We were told the flight was delayed 5 times, then it was moved to the next day.

More choices on snacks. Built-in video screen to enjoy entertainment choices.

we landed at cmh ten minutes early but had to sit on tarmac for twenty minutes because a plane was at our gate despite the fact that 3 other gates were open.

flight was good until we arrived at cmh ten minutes early but then sat on tarmac for twenty minutes because a plane was at our gate, so we had to wait despite the pilot tellling us that 3 other gates were open.

The experience with American Airlines was good, although the Philippines Airlines flight was much better (better seats, better food, better entertainment options, overall better). Again, the MIA to LAX flight was fine, but nothing in comparison to the comfort and accommodations of the Philippines Airlines flight from LAX to MNL.

I have a gluten allergy so did have any food

Everything you need to know for your flight from Incheon Intl to St. Louis

Information on your arrival and departure airports