$382 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 11/17. 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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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

Wed, Jan 7 - Fri, Jan 23
Alaska Airlines Logo
2:50 pm - 6:35 pmSTL-ICN
36h 45m1 stop
Alaska Airlines Logo
8:35 pm - 10:51 pmICN-STL
17h 16m1 stop
$773Alaska Airlines
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Wed, Jan 7 - Thu, Jan 22
Alaska Airlines Logo
2:50 pm - 6:35 pmSTL-ICN
36h 45m1 stop
Alaska Airlines Logo
8:35 pm - 1:54 pmICN-STL
32h 19m1 stop
$779Alaska Airlines
Find Deal
Mon, Nov 24 - Sat, Dec 6
Air Canada Logo
4:05 pm - 5:10 pmSTL-ICN
34h 05m2 stops
Air Canada Logo
8:10 pm - 3:29 pmICN-STL
34h 19m1 stop
$787Air Canada
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Mon, Nov 10 - Thu, Nov 27
United Airlines Logo
9:00 am - 5:40 amSTL-ICN
29h 40m2 stops
United Airlines Logo
6:00 pm - 2:24 pmICN-STL
35h 24m2 stops
$792United Airlines
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Mon, Nov 10 - Thu, Nov 27
United Airlines Logo
12:31 pm - 5:40 amSTL-ICN
26h 09m2 stops
United Airlines Logo
6:00 pm - 12:28 pmICN-STL
33h 28m2 stops
$796United Airlines
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Fri, Mar 6 - Fri, Mar 13
Turkish Airlines Logo
11:50 am - 6:20 pmORD-ICN
39h 30m1 stop
Turkish Airlines Logo
10:45 am - 7:25 pmICN-ORD
46h 40m1 stop
$835Turkish Airlines
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Mon, Nov 10 - Thu, Nov 27
American Airlines Logo
7:00 am - 4:45 pmSTL-ICN
18h 45m1 stop
American Airlines Logo
7:15 pm - 10:39 amICN-STL
30h 24m1 stop
$838American Airlines
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Mon, Nov 10 - Thu, Nov 27
American Airlines Logo
7:00 am - 4:45 pmSTL-ICN
18h 45m1 stop
American Airlines Logo
7:15 pm - 10:39 amICN-STL
30h 24m1 stop
$842American Airlines
Find Deal
Fri, Mar 6 - Thu, Mar 12
Turkish Airlines Logo
11:50 am - 6:20 pmORD-ICN
39h 30m1 stop
Turkish Airlines Logo
12:10 am - 11:05 amICN-ORD
24h 55m1 stop
$844Turkish Airlines
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Mon, Jan 12 - Tue, Jan 20
Delta Logo
7:00 am - 4:20 pmSTL-ICN
18h 20m1 stop
Delta Logo
7:25 pm - 11:39 pmICN-STL
19h 14m1 stop
$846Delta
Find Deal

Everything you should know

Cheapest round-trip
$773
Overall average: $902
Alaska Airlines
Wed 1/7Fri 1/23
STL - ICN • 1 stop
Cheapest non-stop
$1,488
Typical prices: $1,538-$1,879
Korean Air
Mon 11/17Fri 11/21
ORD - ICN • Non-stop
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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 Seoul!
Useful Info

Good to know

Low seasonAugust
Cheapest flight$407
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly with an average 23% 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 $698

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