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Cheap flights from Illinois to South Korea from $358

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to South Korea departing on 3/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Illinois to South Korea

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
1:15 pm - 5:40 am
STL
-
ICN
25h 25m2 stops
United Airlines Logo
4:50 pm - 5:50 am
ICN
-
STL
27h 00m1 stop
$746United Airlines
Sat, Feb 7 - Sun, Apr 26
United Airlines Logo
2:45 pm - 5:40 am
STL
-
ICN
23h 55m2 stops
United Airlines Logo
12:45 pm - 8:58 pm
ICN
-
STL
23h 13m2 stops
$750United Airlines
Sun, Feb 1 - Thu, Feb 5
American Airlines Logo
7:15 am - 4:45 pm
STL
-
ICN
18h 30m1 stop
American Airlines Logo
7:15 pm - 10:59 pm
ICN
-
STL
18h 44m1 stop
$796American Airlines
Fri, Jan 16 - Fri, Jan 23
Multiple Airlines Logo
12:05 pm - 5:40 am
ORD
-
ICN
26h 35m1 stop
Multiple Airlines Logo
6:55 pm - 6:08 am
ICN
-
ORD
49h 13m2 stops
$796Multiple Airlines
Fri, Mar 6 - Mon, Mar 16
American Airlines Logo
6:00 am - 4:45 pm
STL
-
ICN
19h 45m1 stop
American Airlines Logo
7:15 pm - 10:20 am
ICN
-
STL
30h 05m2 stops
$800American Airlines
Fri, Jan 16 - Fri, Jan 23
Multiple Airlines Logo
7:00 am - 6:35 pm
STL
-
ICN
21h 35m1 stop
Multiple Airlines Logo
8:35 pm - 3:20 pm
ICN
-
STL
32h 45m1 stop
$837Multiple Airlines
Thu, Mar 12 - Sun, Mar 22
Delta Logo
6:10 am - 3:30 pm
STL
-
ICN
18h 20m1 stop
Delta Logo
9:35 am - 11:37 pm
ICN
-
STL
29h 02m2 stops
$838Delta
Fri, Jan 16 - Fri, Jan 30
Cathay Pacific Logo
2:35 pm - 1:55 pm
ORD
-
ICN
32h 20m1 stop
Cathay Pacific Logo
7:35 pm - 12:55 pm
ICN
-
ORD
32h 20m1 stop
$843Cathay Pacific
Tue, Feb 3 - Tue, Feb 10
Cathay Pacific Logo
2:35 pm - 12:45 pm
ORD
-
ICN
31h 10m1 stop
Cathay Pacific Logo
3:00 pm - 1:55 pm
ICN
-
ORD
36h 55m1 stop
$855Cathay Pacific
Tue, Mar 3 - Tue, Mar 10
Delta Logo
5:04 pm - 7:45 pm
STL
-
TAE
35h 41m2 stops
Delta Logo
7:40 am - 11:37 pm
TAE
-
STL
30h 57m2 stops
$1,212Delta
Wed, Feb 4 - Wed, Feb 11

United Airlines flights from Illinois to South Korea

Our best United Airlines deals on Illinois to South Korea flight tickets
United Airlines
Feb 7
STL1:15 pmLambert-St Louis
25h 25m
2 stops
ICN5:40 amIncheon Intl
Apr 26
ICN4:50 pmIncheon Intl
27h 00m
1 stop
STL5:50 amLambert-St Louis
$746
Find similar
United Airlines
Feb 1
STL2:45 pmLambert-St Louis
23h 55m
2 stops
ICN5:40 amIncheon Intl
Feb 5
ICN12:45 pmIncheon Intl
23h 13m
2 stops
STL8:58 pmLambert-St Louis
$750
Find similar
United Airlines
Feb 1
STL5:00 pmLambert-St Louis
21h 40m
1 stop
ICN5:40 amIncheon Intl
Feb 5
ICN12:45 pmIncheon Intl
17h 52m
1 stop
STL3:37 pmLambert-St Louis
$846
Find similar

American Airlines flights from Illinois to South Korea

Our best American Airlines deals on Illinois to South Korea flight tickets
American Airlines
Jan 16
STL7:15 amLambert-St Louis
18h 30m
1 stop
ICN4:45 pmIncheon Intl
Jan 23
ICN7:15 pmIncheon Intl
18h 44m
1 stop
STL10:59 pmLambert-St Louis
$796
Find similar
American Airlines
Jan 16
STL6:00 amLambert-St Louis
19h 45m
1 stop
ICN4:45 pmIncheon Intl
Jan 23
ICN7:15 pmIncheon Intl
30h 05m
2 stops
STL10:20 amLambert-St Louis
$800
Find similar
American Airlines
Mar 9
STL5:12 amLambert-St Louis
20h 43m
1 stop
ICN3:55 pmIncheon Intl
Mar 16
ICN5:55 pmIncheon Intl
29h 00m
1 stop
STL8:55 amLambert-St Louis
$851
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to South Korea that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 22, 2025.
Use the filters below to find and compare flights from Illinois to South Korea that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 2/7

1:15 pm-5:40 am

2 stops25h 25m

Incheon Intl

Sun 4/26

4:50 pm-5:50 am

1 stop27h 00m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/1

2:45 pm-5:40 am

2 stops23h 55m

Incheon Intl

Thu 2/5

12:45 pm-8:58 pm

2 stops23h 13m

$750

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 1/16

7:15 am-4:45 pm

1 stop18h 30m

Incheon Intl

Fri 1/23

7:15 pm-10:59 pm

1 stop18h 44m

$796

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Fri 3/6

12:05 pm-5:40 am

1 stop26h 35m

Incheon Intl

Mon 3/16

6:55 pm-6:08 am

2 stops49h 13m

$796

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 1/16

6:00 am-4:45 pm

1 stop19h 45m

Incheon Intl

Fri 1/23

7:15 pm-10:20 am

2 stops30h 05m

$800

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 3/12

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Sun 3/22

8:35 pm-3:20 pm

1 stop32h 45m

$837

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 1/16

6:10 am-3:30 pm

1 stop18h 20m

Incheon Intl

Fri 1/30

9:35 am-11:37 pm

2 stops29h 02m

$838

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Tue 2/3

2:35 pm-1:55 pm

1 stop32h 20m

Incheon Intl

Tue 2/10

7:35 pm-12:55 pm

1 stop32h 20m

$843

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Tue 3/3

2:35 pm-12:45 pm

1 stop31h 10m

Incheon Intl

Tue 3/10

3:00 pm-1:55 pm

1 stop36h 55m

$855

St. LouisDaegu

STL - TAE

STLTAE

Lambert-St Louis

Wed 2/4

5:04 pm-7:45 pm

2 stops35h 41m

Daegu

Wed 2/11

7:40 am-11:37 pm

2 stops30h 57m

$1,212

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to South Korea from

How to get the cheapest flight ticket from Illinois to South Korea

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to South Korea?

If you aren’t able to travel to South Korea during the month of January, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $924.

What is the cheapest day to depart on your flight to South Korea?

On average, the least expensive day to fly to South Korea from Illinois is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $977. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to South Korea for around $1,266.

What is the cheapest time of day to depart on your flight to South Korea?

Flying to South Korea from Illinois in the evening is the least expensive time of day to depart. momondo users have found prices as low as $982 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,432 on average. Flights to South Korea from Illinois in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Illinois to South Korea flight route?

Fly from Chicago O'Hare Intl to Incheon Intl for the best Illinois - South Korea flight prices

How far in advance should I book a flight to South Korea?

You are more likely to see cheaper flights to South Korea from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to South Korea for around $1,538 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to South Korea from Illinois for as low as $1,311 on momondo.

What cabin class options are available on Illinois to South Korea flights?

There are 4 cabin classes available to choose from on Illinois to South Korea flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Illinois to South Korea flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to South Korea

Best Price Found

$612

Fastest flight time

14h 20m

Direct flights

Every day

Airports in South Korea

24 airports
The best one-way flight to South Korea from Illinois in the past 72 hours is $612. The best round-trip flight deal from Illinois to South Korea found on momondo in the last 72 hours is $815.
The fastest flight from Illinois to South Korea takes 14h 20m
Direct flights go from Illinois to South Korea every day.
There are 24 airports in South Korea. From Illinois there are direct flights to Incheon Intl (ICN).
Search flight deals

  • When did momondo last update prices for flights from Illinois to South Korea?

    Prices for flights from Illinois to South Korea were last updated today.

  • How many operators does momondo search for flights from Illinois to South Korea?

  • How old do you have to be to fly from Illinois to South Korea?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to South Korea.

  • What documentation or ID do you need to fly to South Korea?

    The travel and health documents you'll need for your trip to South Korea may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at South Korea. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Illinois to South Korea?

Best airlines flying from Illinois to South Korea

Compare and see reviews for airlines that fly from Illinois to South Korea with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $194Free CancellationRating
7.9
8,014 reviews
Search Delta flights
United AirlinesPriceFrom $287Free CancellationRating
7.4
9,102 reviews
Search United Airlines flights
Cathay PacificPriceFrom $639Free CancellationRating
7.6
1,102 reviews
Search Cathay Pacific flights
Turkish AirlinesPriceFrom $849Free CancellationRating
7.3
4,107 reviews
Search Turkish Airlines flights
American AirlinesPriceFrom $926Free CancellationRating
7.2
11,052 reviews
Search American Airlines flights
EVA AirPriceFrom $1,003Free CancellationRating
8.4
1,298 reviews
Search EVA Air flights
Air CanadaPriceFrom $1,098Free CancellationRating
7.1
10,551 reviews
Search Air Canada flights
FinnairPriceFrom $1,110Free CancellationRating
7.6
1,339 reviews
Search Finnair flights
Korean AirPriceFrom $1,505Free CancellationRating
8.4
1,185 reviews
Search Korean Air flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to South Korea?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to South Korea. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to South Korea with flexible booking policies on momondo?

momondo does allow users to show only those flights to South Korea from Illinois which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Illinois to South Korea?

momondo helps you find the best flight between Illinois and South Korea by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Illinois to South Korea right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Illinois to South Korea now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to South Korea and let you know when they change.

An easier way to manage your South Korea trip

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