$358 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 3/1. 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
$746
Overall average: $1,046
Multiple Airlines
Thu 4/2Thu 4/16
STL - ICN • 1 stop
Cheapest non-stop
$1,515
Typical prices: $1,557-$1,783
Korean Air
Thu 1/22Thu 1/29
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 - Thu, Apr 16
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
17h 24m1 stop
$746Multiple Airlines
Fri, Feb 13 - Sun, Mar 1
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
20h 35m1 stop
Multiple Airlines Logo
8:35 pm - 11:59 pm
ICN
-
STL
18h 24m1 stop
$766Multiple Airlines
Mon, Jan 19 - Mon, Jan 26
United Airlines Logo
3:11 pm - 5:40 am
STL
-
ICN
23h 29m2 stops
United Airlines Logo
12:45 pm - 3:37 pm
ICN
-
STL
17h 52m1 stop
$846United Airlines
Sun, Feb 1 - Thu, Feb 5
United Airlines Logo
2:45 pm - 5:40 am
STL
-
ICN
23h 55m2 stops
United Airlines Logo
12:45 pm - 10:58 pm
ICN
-
STL
25h 13m2 stops
$850United Airlines
Mon, Jan 19 - Mon, Jan 26
Cathay Pacific Logo
2:35 pm - 9:25 pm
ORD
-
ICN
39h 50m1 stop
Cathay Pacific Logo
3:00 pm - 12:55 pm
ICN
-
ORD
36h 55m1 stop
$850Cathay Pacific
Fri, Mar 6 - Thu, Mar 19
Turkish Airlines Logo
11:50 am - 6:20 pm
ORD
-
ICN
39h 30m1 stop
Turkish Airlines Logo
12:10 am - 11:05 am
ICN
-
ORD
24h 55m1 stop
$851Turkish Airlines
Wed, Feb 11 - Sat, Feb 28
American Airlines Logo
7:15 am - 4:45 pm
STL
-
ICN
18h 30m1 stop
American Airlines Logo
7:15 pm - 8:52 am
ICN
-
STL
28h 37m1 stop
$851American Airlines
Mon, Jan 19 - Wed, Jan 28
Cathay Pacific Logo
2:35 pm - 6:35 pm
ORD
-
ICN
37h 00m1 stop
Cathay Pacific Logo
1:45 pm - 12:55 pm
ICN
-
ORD
38h 10m1 stop
$853Cathay Pacific
Sun, Mar 8 - Wed, Mar 18
Turkish Airlines Logo
12:50 pm - 6:20 pm
ORD
-
ICN
39h 30m1 stop
Turkish Airlines Logo
12:10 am - 7:25 pm
ICN
-
ORD
33h 15m1 stop
$857Turkish Airlines
Mon, Mar 2 - Wed, Mar 11
American Airlines Logo
2:55 pm - 4:45 pm
CMI
-
ICN
34h 50m1 stop
American Airlines Logo
5:55 pm - 8:58 pm
ICN
-
CMI
17h 03m1 stop
$916American Airlines
Useful Info

Good to know

Low seasonAugust
Cheapest flight$358
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly with an average 21% increase in price.
Flight from Chicago O'Hare Airport 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 $707