$380 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 1/28. 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
$730
Typical prices: $819-$1,215
Multiple Airlines
Thu 4/2Wed 4/8
STL - ICN • 1 stop
Cheapest non-stop
$1,578
Typical prices: $1,583-$1,782
Korean Air
Mon 3/9Thu 3/19
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

Thu, Apr 2 - Wed, Apr 8
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m
1 stop
Multiple Airlines Logo
7:05 pm - 3:24 pm
ICN
-
STL
34h 19m
1 stop
$730Multiple Airlines
Sun, Mar 8 - Sun, Mar 15
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m
1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m
1 stop
$738Multiple Airlines
Tue, Mar 3 - Mon, Mar 9
Turkish Airlines Logo
8:20 pm - 6:20 pm
ORD
-
ICN
31h 00m
1 stop
Turkish Airlines Logo
12:10 am - 7:25 pm
ICN
-
ORD
33h 15m
1 stop
$818Turkish Airlines
Sun, Feb 1 - Wed, Feb 11
Turkish Airlines Logo
11:50 am - 6:20 pm
ORD
-
ICN
39h 30m
1 stop
Turkish Airlines Logo
10:45 am - 10:05 am
ICN
-
ORD
38h 20m
1 stop
$828Turkish Airlines
Thu, Mar 5 - Mon, Mar 9
United Airlines Logo
6:51 am - 4:15 pm
STL
-
ICN
18h 24m
1 stop
United Airlines Logo
11:45 am - 10:25 pm
ICN
-
STL
24h 40m
1 stop
$847United Airlines
Thu, Apr 16 - Wed, Apr 22
United Airlines Logo
8:54 am - 4:20 am
STL
-
ICN
29h 26m
2 stops
United Airlines Logo
4:50 pm - 10:56 pm
ICN
-
STL
20h 06m
2 stops
$851United Airlines
Thu, Apr 16 - Wed, Apr 22
Japan Airlines Logo
7:05 am - 10:45 am
STL
-
GMP
37h 40m
2 stops
Japan Airlines Logo
7:55 am - 10:14 pm
GMP
-
STL
28h 19m
2 stops
$912Japan Airlines
Mon, Mar 2 - Wed, Mar 11
American Airlines Logo
2:54 pm - 4:45 pm
CMI
-
ICN
34h 51m
1 stop
American Airlines Logo
5:55 pm - 8:54 pm
ICN
-
CMI
16h 59m
1 stop
$917American Airlines
Mon, Mar 2 - Wed, Mar 11
American Airlines Logo
2:54 pm - 4:45 pm
CMI
-
ICN
34h 51m
1 stop
American Airlines Logo
5:55 pm - 8:54 pm
ICN
-
CMI
16h 59m
1 stop
$918American Airlines
Sun, Mar 8 - Sun, Mar 15
Japan Airlines Logo
6:38 am - 10:05 pm
STL
-
GMP
25h 27m
2 stops
Japan Airlines Logo
7:40 pm - 1:43 pm
GMP
-
STL
32h 03m
2 stops
$1,250Japan Airlines
Useful Info

Good to know

Low seasonAugust
Cheapest flight$380
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
Premium Economy Class flights to Seoulfrom $5,635
Economy Class flights to Seoulfrom $707