$340 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 2/19. 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
Typical prices: $1,251-$1,544
Delta
Mon 2/2Fri 2/6
STL - ICN • 1 stop
Cheapest non-stop
$1,556
Typical prices: $1,629-$1,880
Korean Air
Mon 1/12Mon 1/26
ORD - ICN • Non-stop
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Flight Deals
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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

Mon, Feb 2 - Fri, Feb 6
Delta Logo
6:10 am - 3:30 pmSTL-ICN
18h 20m1 stop
Delta Logo
7:25 pm - 11:37 pmICN-STL
19h 12m1 stop
$746Delta
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Mon, Feb 2 - Fri, Feb 6
Delta Logo
6:10 am - 3:30 pmSTL-ICN
18h 20m1 stop
Delta Logo
9:35 am - 5:50 pmICN-STL
23h 15m2 stops
$750Delta
Find Deal
Mon, Jan 12 - Thu, Jan 29
Cathay Pacific Logo
2:35 pm - 1:55 pmORD-ICN
32h 20m1 stop
Cathay Pacific Logo
1:45 pm - 12:55 pmICN-ORD
38h 10m1 stop
$799Cathay Pacific
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Sun, Jan 11 - Sun, Jan 25
Cathay Pacific Logo
2:35 pm - 1:55 pmORD-ICN
32h 20m1 stop
Cathay Pacific Logo
1:45 pm - 12:55 pmICN-ORD
38h 10m1 stop
$800Cathay Pacific
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Thu, Dec 4 - Thu, Dec 11
Multiple Airlines Logo
9:06 pm - 4:20 pmORD-ICN
28h 14m1 stop
Multiple Airlines Logo
1:20 pm - 12:13 amICN-ORD
25h 53m1 stop
$804Multiple Airlines
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Fri, Jan 23 - Tue, Jan 27
United Airlines Logo
8:46 am - 5:40 amMLI-ICN
29h 54m2 stops
United Airlines Logo
12:45 pm - 4:54 pmICN-MLI
19h 09m2 stops
$820United Airlines
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Thu, Dec 4 - Sun, Dec 14
Multiple Airlines Logo
6:50 am - 4:20 pmORD-ICN
42h 30m1 stop
Multiple Airlines Logo
10:20 pm - 6:05 amICN-ORD
22h 45m1 stop
$835Multiple Airlines
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Fri, Dec 5 - Sat, Dec 13
Multiple Airlines Logo
6:50 am - 4:20 pmORD-ICN
42h 30m1 stop
Multiple Airlines Logo
1:20 pm - 12:13 amICN-ORD
25h 53m1 stop
$838Multiple Airlines
Find Deal
Thu, Dec 4 - Tue, Dec 9
United Airlines Logo
3:19 pm - 5:40 amSTL-ICN
23h 21m2 stops
United Airlines Logo
12:45 pm - 4:27 pmICN-STL
18h 42m1 stop
$846United Airlines
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Fri, Mar 20 - Sun, Mar 29
Alaska Airlines Logo
7:00 am - 6:35 pmSTL-ICN
21h 35m1 stop
Alaska Airlines Logo
8:35 pm - 2:11 pmICN-STL
31h 36m1 stop
$873Alaska Airlines
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Good to know

Low seasonAugust
Cheapest flight$340
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly with an average 20% 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 $726