$359 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 2/27. 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
$846
Typical prices: $1,251-$1,544
Delta
Fri 2/13Sun 2/22
STL - ICN • 1 stop
Cheapest non-stop
$1,582
Typical prices: $1,575-$1,807
Korean Air
Thu 2/5Thu 3/5
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, Feb 13 - Sun, Feb 22
Delta Logo
6:00 am - 3:50 pmSTL-ICN
18h 50m1 stop
Delta Logo
6:00 pm - 8:41 pmICN-STL
17h 41m1 stop
$846Delta
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Sun, Feb 15 - Thu, Feb 19
Delta Logo
6:10 am - 4:30 pmSTL-ICN
19h 20m2 stops
Delta Logo
9:35 am - 5:42 pmICN-STL
23h 07m2 stops
$850Delta
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Fri, Feb 6 - Fri, Feb 20
American Airlines Logo
7:15 am - 4:45 pmSTL-ICN
18h 30m1 stop
American Airlines Logo
7:15 pm - 11:18 pmICN-STL
19h 03m1 stop
$856American Airlines
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Wed, Jan 14 - Wed, Jan 28
Japan Airlines Logo
7:04 am - 10:05 pmSTL-GMP
24h 01m2 stops
Japan Airlines Logo
12:05 pm - 11:59 pmGMP-STL
26h 54m2 stops
$856Japan Airlines
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Fri, Feb 6 - Fri, Feb 20
American Airlines Logo
5:50 am - 4:45 pmSTL-ICN
19h 55m1 stop
American Airlines Logo
7:15 pm - 8:32 amICN-STL
28h 17m2 stops
$860American Airlines
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Fri, Jan 30 - Sun, Feb 1
United Airlines Logo
2:45 pm - 5:40 amSTL-ICN
23h 55m2 stops
United Airlines Logo
6:00 pm - 5:11 amICN-STL
26h 11m1 stop
$866United Airlines
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Mon, Mar 2 - Sat, Mar 7
Multiple Airlines Logo
5:53 pm - 5:40 amORD-ICN
20h 47m1 stop
Multiple Airlines Logo
8:35 pm - 2:58 pmICN-ORD
33h 23m2 stops
$879Multiple Airlines
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Thu, Jan 15 - Thu, Jan 22
Japan Airlines Logo
7:04 am - 10:05 pmSTL-GMP
24h 01m2 stops
Japan Airlines Logo
12:05 pm - 11:59 pmGMP-STL
26h 54m2 stops
$881Japan Airlines
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Sat, Feb 28 - Thu, Mar 5
Multiple Airlines Logo
5:53 pm - 5:40 amORD-ICN
20h 47m1 stop
Multiple Airlines Logo
9:20 pm - 12:01 pmICN-ORD
29h 41m2 stops
$883Multiple Airlines
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Thu, Jan 8 - Fri, Jan 16
United Airlines Logo
5:00 pm - 5:40 amSTL-ICN
21h 40m1 stop
United Airlines Logo
12:45 pm - 3:37 pmICN-STL
17h 52m1 stop
$920United Airlines
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Useful Info

Good to know

Low seasonAugust
Cheapest flight$397
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 $736