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Cheap flights from Illinois to Seoul from $400

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 Seoul departing on 8/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Seoul

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
6:30 am - 6:45 pm
STL
-
ICN
46h 15m
2 stops
WestJet Logo
8:45 pm - 11:18 pm
ICN
-
STL
40h 33m
2 stops
$1,061WestJet
Fri, Oct 16 - Sun, Oct 25
WestJet Logo
1:55 pm - 6:45 pm
STL
-
ICN
38h 50m
2 stops
WestJet Logo
8:45 pm - 2:49 pm
ICN
-
STL
32h 04m
2 stops
$1,065WestJet
Wed, Sep 16 - Fri, Sep 25
Cathay Pacific Logo
4:00 pm - 2:05 pm
ORD
-
ICN
32h 05m
1 stop
Cathay Pacific Logo
1:55 am - 1:55 pm
ICN
-
ORD
26h 00m
1 stop
$1,177Cathay Pacific
Sat, Sep 12 - Tue, Sep 15
Cathay Pacific Logo
4:00 pm - 2:05 pm
ORD
-
ICN
32h 05m
1 stop
Cathay Pacific Logo
8:00 am - 2:20 pm
ICN
-
ORD
20h 20m
1 stop
$1,178Cathay Pacific
Sat, Aug 22 - Wed, Sep 9
Multiple Airlines Logo
9:20 pm - 3:50 pm
ORD
-
ICN
28h 30m
1 stop
Multiple Airlines Logo
8:30 pm - 6:17 am
ICN
-
ORD
47h 47m
2 stops
$1,180Multiple Airlines
Sat, Aug 29 - Mon, Sep 7
Multiple Airlines Logo
11:30 pm - 10:30 am
ORD
-
ICN
20h 00m
1 stop
Multiple Airlines Logo
7:20 am - 4:55 pm
ICN
-
ORD
24h 35m
1 stop
$1,181Multiple Airlines
Mon, Nov 9 - Mon, Nov 23
American Airlines Logo
7:20 am - 3:45 pm
MLI
-
ICN
18h 25m
1 stop
American Airlines Logo
6:35 pm - 11:25 pm
ICN
-
MLI
18h 50m
1 stop
$1,456American Airlines
Tue, Oct 20 - Thu, Oct 29
American Airlines Logo
7:20 am - 3:45 pm
MLI
-
ICN
18h 25m
1 stop
American Airlines Logo
6:35 pm - 10:44 am
ICN
-
MLI
30h 09m
2 stops
$1,460American Airlines
Tue, Oct 20 - Thu, Oct 29
Qatar Airways Logo
2:41 pm - 5:05 pm
CMI
-
ICN
36h 24m
2 stops
Qatar Airways Logo
1:20 am - 10:05 pm
ICN
-
CMI
34h 45m
2 stops
$1,923Qatar Airways
Wed, Sep 30 - Sat, Oct 3
Qatar Airways Logo
2:41 pm - 5:05 pm
CMI
-
ICN
36h 24m
2 stops
Qatar Airways Logo
1:20 am - 9:40 pm
ICN
-
CMI
58h 20m
2 stops
$2,149Qatar Airways
Fri, Sep 11 - Mon, Sep 14

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Japan Airlines flights from Illinois to Incheon Intl Airport

Our best Japan Airlines deals on Illinois to Incheon Intl Airport flight tickets
Japan Airlines
Oct 19
MLI7:20 amMoline Quad-City
18h 25m
1 stop
ICN3:45 pmIncheon Intl
Oct 29
ICN6:35 pmIncheon Intl
18h 50m
1 stop
MLI11:25 pmMoline Quad-City
$1,685
Japan Airlines
Oct 19
MLI7:20 amMoline Quad-City
18h 25m
1 stop
ICN3:45 pmIncheon Intl
Oct 30
ICN6:35 pmIncheon Intl
18h 50m
1 stop
MLI11:25 pmMoline Quad-City
$1,735
Japan Airlines
Sep 28
MLI7:15 amMoline Quad-City
18h 30m
1 stop
ICN3:45 pmIncheon Intl
Oct 8
ICN5:50 pmIncheon Intl
19h 35m
1 stop
MLI11:25 pmMoline Quad-City
$2,052

WestJet flights from Illinois to Incheon Intl Airport

Our best WestJet deals on Illinois to Incheon Intl Airport flight tickets
WestJet
Oct 16
STL6:30 amLambert-St Louis
46h 15m
2 stops
ICN6:45 pmIncheon Intl
Oct 25
ICN8:45 pmIncheon Intl
40h 33m
2 stops
STL11:18 pmLambert-St Louis
$1,061
WestJet
Sep 16
STL1:55 pmLambert-St Louis
38h 50m
2 stops
ICN6:45 pmIncheon Intl
Sep 25
ICN8:45 pmIncheon Intl
32h 04m
2 stops
STL2:49 pmLambert-St Louis
$1,065
WestJet
Oct 12
STL5:45 pmLambert-St Louis
59h 00m
2 stops
ICN6:45 pmIncheon Intl
Oct 27
ICN8:45 pmIncheon Intl
40h 33m
2 stops
STL11:18 pmLambert-St Louis
$1,070

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Incheon Intl Airport 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 June 24, 2026.
Use the filters below to find and compare flights from Illinois to Incheon Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/16

6:30 am-6:45 pm

2 stops46h 15m

Incheon Intl

Sun 10/25

8:45 pm-11:18 pm

2 stops40h 33m

$1,061

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 9/16

1:55 pm-6:45 pm

2 stops38h 50m

Incheon Intl

Fri 9/25

8:45 pm-2:49 pm

2 stops32h 04m

$1,065

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sat 9/12

4:00 pm-2:05 pm

1 stop32h 05m

Incheon Intl

Tue 9/15

1:55 am-1:55 pm

1 stop26h 00m

$1,177

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sat 8/22

4:00 pm-2:05 pm

1 stop32h 05m

Incheon Intl

Wed 9/9

8:00 am-2:20 pm

1 stop20h 20m

$1,178

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sat 8/29

9:20 pm-3:50 pm

1 stop28h 30m

Incheon Intl

Mon 9/7

8:30 pm-6:17 am

2 stops47h 47m

$1,180

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Mon 11/9

11:30 pm-10:30 am

1 stop20h 00m

Incheon Intl

Mon 11/23

7:20 am-4:55 pm

1 stop24h 35m

$1,181
Quickest round-trip

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Tue 10/20

7:20 am-3:45 pm

1 stop18h 25m

Incheon Intl

Thu 10/29

6:35 pm-11:25 pm

1 stop18h 50m

$1,456

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Tue 10/20

7:20 am-3:45 pm

1 stop18h 25m

Incheon Intl

Thu 10/29

6:35 pm-10:44 am

2 stops30h 09m

$1,460

ChampaignIncheon

CMI - ICN

CMIICN

Champaign University-Willard

Wed 9/30

2:41 pm-5:05 pm

2 stops36h 24m

Incheon Intl

Sat 10/3

1:20 am-10:05 pm

2 stops34h 45m

$1,923

ChampaignIncheon

CMI - ICN

CMIICN

Champaign University-Willard

Fri 9/11

2:41 pm-5:05 pm

2 stops36h 24m

Incheon Intl

Mon 9/14

1:20 am-9:40 pm

2 stops58h 20m

$2,149

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 Seoul from

How to get the cheapest flight ticket from Illinois to Incheon Intl Airport

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 Incheon Intl Airport?

The cheapest month to fly to Incheon Intl Airport from Illinois is in October. Flight prices, which tend to average around $137, are often lower during this time because this is during the off-season. If you are unable to visit Incheon Intl Airport during the month of October, then departing from Illinois during the month February is also very affordable. Most momondo users find prices during this month for around $177.

What is the cheapest day to depart on your flight to Incheon Intl Airport?

The cheapest day to depart from Illinois to Incheon Intl Airport is on a Tuesday when prices can be found for as low as $905. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,103. These prices are subject to change though, so be sure to set up a Price Alert for flights to Incheon Intl Airport.

What is the cheapest time of day to depart on your flight to Incheon Intl Airport?

In the evening is the cheapest time of day to fly from Illinois to Incheon Intl Airport when you can find flight prices for as low as $982. Flying to Incheon Intl Airport in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $987 on average. Flights to Incheon Intl Airport from Illinois in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Illinois to Incheon Intl flight route?

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

How far in advance should I book a flight from Illinois to Incheon Intl Airport?

You are more likely to see cheaper flights to Incheon Intl Airport from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Incheon Intl Airport for around $1,490 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Incheon Intl Airport from Illinois for as low as $1,094 on momondo.

What cabin class options are available on Illinois to Incheon Intl Airport flights?

There are 3 cabin classes available to choose from on Illinois to Incheon Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Incheon Intl Airport flights?

You could potentially save up to 13% on your flight if you consider stops on a Illinois to Incheon Intl Airport flight.

Cheap Illinois to Incheon Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Incheon Intl Airport

Best Price Found

$591

Fastest flight time

14h 20m

Direct flights

Every day
The best one-way flight to Incheon Intl Airport from Illinois in the past 72 hours is $591. The best round-trip flight deal from Illinois to Incheon Intl Airport found on momondo in the last 72 hours is $942.
The fastest flight from Illinois to Incheon Intl Airport takes 14h 20m
Direct flights go from Illinois to Incheon Intl Airport every day.
Search flight deals

Frequently asked questions about flying from Illinois to Incheon Intl Airport

  • When did momondo last update prices for flights from Illinois to Incheon Intl Airport?

    Prices for flights from Illinois to Incheon Intl Airport were last updated today.

  • How many operators does momondo search for flights from Illinois to Incheon Intl Airport?

  • How old do you have to be to fly from Illinois to Incheon Intl Airport?

    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 Incheon Intl Airport.

  • What documentation or ID do you need to fly to Incheon Intl Airport?

    The travel and health documents required for your trip to Incheon Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Incheon Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Illinois to Incheon Intl Airport?

Best airlines flying from Illinois to Incheon Intl Airport

Compare and see reviews for airlines that fly from Illinois to Incheon Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $194Free CancellationRating
7.8
8,431 reviews
Search Delta flights
Cathay PacificPriceFrom $639Free CancellationRating
7.6
1,388 reviews
Search Cathay Pacific flights
Turkish AirlinesPriceFrom $845Free CancellationRating
7.4
4,414 reviews
Search Turkish Airlines flights
American AirlinesPriceFrom $916Free CancellationRating
7.1
11,750 reviews
Search American Airlines flights
Japan AirlinesPriceFrom $931Free CancellationRating
8.3
1,849 reviews
Search Japan Airlines flights
EVA AirPriceFrom $947Free CancellationRating
8.5
1,481 reviews
Search EVA Air flights
Air CanadaPriceFrom $1,088Free CancellationRating
7.1
11,251 reviews
Search Air Canada flights
Asiana AirlinesPriceFrom $1,148Free CancellationRating
8.1
547 reviews
Search Asiana Airlines flights
FinnairPriceFrom $1,174Free CancellationRating
7.6
1,415 reviews
Search Finnair flights
United AirlinesPriceFrom $1,191Free CancellationRating
7.4
9,881 reviews
Search United Airlines flights

Traveling to a place near Seoul?

Book flights to Seoul if you plan to visit one of these locations
Daejeon
Suwon
Seongnam
Anyang

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to Seoul for you.

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

Yes. All flights to Seoul from Illinois on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Illinois to Seoul?

Once all potential Illinois to Seoul flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

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

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