$368 Find Cheap Flights from Illinois to Seoul

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seoul departing on 4/5. 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

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Everything you should know

Cheapest round-trip
$733
Overall average: $799
Multiple Airlines
Fri 1/23Thu 1/29
STL - ICN • 1 stop
Cheapest non-stop
$1,582
Typical prices: $1,557-$1,831
Korean Air
Mon 2/2Wed 2/11
ORD - ICN • Non-stop
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Illinois to Seoul

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Seoul 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 Illinois to Seoul

Fri, Jan 23 - Thu, Jan 29
Multiple Airlines Logo
2:50 pm - 6:35 pm
STL
-
ICN
36h 45m1 stop
Multiple Airlines Logo
8:35 pm - 1:54 pm
ICN
-
STL
32h 19m1 stop
$733Multiple Airlines
Sat, Mar 28 - Sat, Apr 4
Multiple Airlines Logo
5:30 pm - 6:35 pm
STL
-
ICN
35h 05m1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m1 stop
$753Multiple Airlines
Thu, Jan 22 - Mon, Jan 26
Multiple Airlines Logo
2:50 pm - 6:35 pm
STL
-
ICN
36h 45m1 stop
Multiple Airlines Logo
8:35 pm - 1:54 pm
ICN
-
STL
32h 19m1 stop
$759Multiple Airlines
Mon, Mar 2 - Tue, Mar 10
Turkish Airlines Logo
8:20 pm - 9:05 am
ORD
-
ICN
21h 45m1 stop
Turkish Airlines Logo
12:10 am - 11:05 am
ICN
-
ORD
24h 55m1 stop
$841Turkish Airlines
Sat, Apr 4 - Sun, May 3
Delta Logo
6:29 am - 5:20 pm
STL
-
ICN
20h 51m1 stop
Delta Logo
4:25 pm - 11:33 pm
ICN
-
STL
21h 08m1 stop
$847Delta
Thu, Jan 29 - Thu, Feb 5
Japan Airlines Logo
7:04 am - 10:05 pm
STL
-
GMP
24h 01m2 stops
Japan Airlines Logo
12:05 pm - 11:59 pm
GMP
-
STL
26h 54m2 stops
$847Japan Airlines
Thu, Jan 22 - Mon, Jan 26
United Airlines Logo
3:11 pm - 5:40 am
STL
-
ICN
23h 29m2 stops
United Airlines Logo
6:00 pm - 10:58 pm
ICN
-
STL
19h 58m2 stops
$850United Airlines
Thu, Jan 22 - Mon, Jan 26
United Airlines Logo
2:45 pm - 5:40 am
STL
-
ICN
23h 55m2 stops
United Airlines Logo
12:45 pm - 3:37 pm
ICN
-
STL
17h 52m1 stop
$851United Airlines
Sat, Mar 28 - Sun, Apr 5
Delta Logo
5:29 pm - 5:20 pm
STL
-
ICN
33h 51m1 stop
Delta Logo
7:20 pm - 12:21 am
ICN
-
STL
19h 01m1 stop
$852Delta
Thu, Jan 22 - Mon, Jan 26
Japan Airlines Logo
6:00 am - 10:55 am
STL
-
GMP
37h 55m2 stops
Japan Airlines Logo
12:05 pm - 6:16 pm
GMP
-
STL
45h 11m2 stops
$880Japan Airlines
Useful Info

Good to know

Low seasonAugust
Cheapest flight$368
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly with an average 23% increase in price.
Flight from St. Louis to Seoul Incheon Airport

FAQs for booking flights from Illinois to Seoul

  • How does KAYAK find such low prices on flights from Illinois to Seoul?

    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 Illinois to Seoul.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Seoul?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seoul from Illinois 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 Illinois to Seoul?

    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 Seoul with an airline and back to Illinois with another airline.

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

    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 Seoul from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight to Seoul

Cabin class types available on flights to Illinois

Cabin classes available on flights to Seoul. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
First Class flights to Seoulfrom $26,570
Business Class flights to Seoulfrom $4,268
Prem Econ Class flights to Seoulfrom $5,635
Economy Class flights to Seoulfrom $710