$299 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 1/16. 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 Seoul

Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$646
Typical prices: $799-$1,307
Delta
Fri 1/16Fri 1/23
STL - ICN • 1 stop
Cheapest non-stop
$1,543
Typical prices: $1,557-$1,817
Korean Air
Thu 1/15Wed 1/28
ORD - ICN • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seoul!
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 16 - Fri, Jan 23
Delta Logo
6:35 am - 4:50 pm
STL
-
ICN
19h 15m1 stop
Delta Logo
7:40 pm - 9:38 pm
ICN
-
STL
16h 58m1 stop
$646Delta
Fri, Jan 16 - Fri, Jan 23
Delta Logo
6:55 pm - 3:30 pm
STL
-
ICN
29h 35m2 stops
Delta Logo
7:30 pm - 11:37 pm
ICN
-
STL
19h 07m2 stops
$650Delta
Sat, Mar 28 - Wed, Apr 8
Multiple Airlines Logo
2:55 pm - 6:35 pm
STL
-
ICN
37h 40m1 stop
Multiple Airlines Logo
8:35 pm - 11:55 pm
ICN
-
STL
17h 20m1 stop
$651Multiple Airlines
Sat, Jan 31 - Sat, Feb 7
Multiple Airlines Logo
6:19 pm - 6:35 pm
STL
-
ICN
33h 16m1 stop
Multiple Airlines Logo
8:35 pm - 1:54 pm
ICN
-
STL
32h 19m1 stop
$656Multiple Airlines
Sun, Feb 1 - Thu, Feb 5
United Airlines Logo
5:00 pm - 5:40 am
STL
-
ICN
21h 40m1 stop
United Airlines Logo
12:45 pm - 3:37 pm
ICN
-
STL
17h 52m1 stop
$746United Airlines
Sun, Feb 1 - Thu, Feb 5
United Airlines Logo
9:57 am - 5:40 am
STL
-
ICN
28h 43m2 stops
United Airlines Logo
12:45 pm - 3:37 pm
ICN
-
STL
17h 52m1 stop
$750United Airlines
Wed, Jan 21 - Sun, Jan 25
Japan Airlines Logo
7:04 am - 10:55 am
STL
-
GMP
36h 51m2 stops
Japan Airlines Logo
7:40 pm - 11:59 pm
GMP
-
STL
43h 19m2 stops
$780Japan Airlines
Mon, Jan 19 - Wed, Jan 28
Cathay Pacific Logo
2:35 pm - 12:45 pm
ORD
-
ICN
31h 10m1 stop
Cathay Pacific Logo
7:35 pm - 12:55 pm
ICN
-
ORD
32h 20m1 stop
$845Cathay Pacific
Mon, Jan 19 - Wed, Jan 28
Cathay Pacific Logo
2:35 pm - 1:55 pm
ORD
-
ICN
32h 20m1 stop
Cathay Pacific Logo
10:00 am - 12:55 pm
ICN
-
ORD
41h 55m1 stop
$856Cathay Pacific
Tue, Jan 13 - Tue, Jan 20
Japan Airlines Logo
7:04 am - 10:05 pm
STL
-
GMP
24h 01m2 stops
Japan Airlines Logo
8:00 am - 6:16 pm
GMP
-
STL
25h 16m2 stops
$866Japan Airlines
Useful Info

Good to know

Low seasonAugust
Cheapest flight$299
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 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 $728