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$417+ Cheap flights from Illinois to Seoul (SEL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/26. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEL
Apr 23 — Apr 301
Thu 4/23
Thu 4/30
1 adult, Economy
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Cheap flight deals from Illinois to Seoul

Cheapest flights from Illinois to Seoul
Explore the most affordable flight options available from Illinois to Seoul. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 24, 2026.

This FlightHub deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/308:10 pm
ORD
-
ICN
1 stop31h 30m
Turkish Airlines
Mon 10/2610:45 am
ICN
-
ORD
1 stop38h 20m
Turkish Airlines
Deal found 3/19$947
This Kiwi.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/205:15 am
ORD
-
ICN
1 stop20h 35m
Multiple Airlines
Tue 5/51:00 pm
ICN
-
ORD
1 stop23h 04m
Multiple Airlines
Deal found 3/20$951
This Booking.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/712:50 pm
ORD
-
ICN
1 stop29h 15m
Turkish Airlines
Sat 11/2112:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 3/19$955
This CrystalTravel deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/238:10 pm
ORD
-
ICN
1 stop31h 30m
Turkish Airlines
Tue 9/811:20 pm
ICN
-
ORD
1 stop24h 20m
Turkish Airlines
Deal found 3/23$957
This KAYAK deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:25 am
ORD
-
ICN
1 stop40h 15m
Turkish Airlines
Wed 10/2810:45 am
ICN
-
ORD
1 stop38h 20m
Turkish Airlines
Deal found 3/19$963
This Booking.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:10 pm
ORD
-
ICN
1 stop31h 30m
Turkish Airlines
Fri 9/1110:15 am
ICN
-
ORD
1 stop37h 25m
Turkish Airlines
Deal found 3/20$964
This Kiwi.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:21 pm
ORD
-
ICN
1 stop30h 29m
Multiple Airlines
Fri 5/222:10 pm
ICN
-
ORD
2 stops46h 51m
Multiple Airlines
Deal found 3/20$972
This CrystalTravel deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/411:30 pm
ORD
-
ICN
1 stop20h 00m
EVA Air
Tue 11/2411:40 am
ICN
-
ORD
1 stop22h 55m
EVA Air
Deal found 3/21$975
This FlightHub deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:10 pm
ORD
-
ICN
1 stop31h 30m
Turkish Airlines
Tue 9/811:20 pm
ICN
-
ORD
1 stop24h 20m
Turkish Airlines
Deal found 3/23$976
This Air Canada deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2312:10 pm
STL
-
ICN
1 stop38h 05m
Air Canada
Tue 10/67:05 pm
ICN
-
STL
1 stop38h 55m
Air Canada
Deal found 3/21$979
This FlightHub deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:25 am
ORD
-
ICN
1 stop40h 15m
Turkish Airlines
Tue 9/811:20 pm
ICN
-
ORD
1 stop24h 20m
Turkish Airlines
Deal found 3/20$983
This Air Canada deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/222:40 pm
STL
-
ICN
2 stops35h 25m
Air Canada
Tue 10/65:45 pm
ICN
-
STL
2 stops34h 15m
Air Canada
Deal found 3/21$984

Find flight deals from Illinois to Seoul

Keep the following information in mind while searching for Illinois to Seoul flight deals. Data was last updated March 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$947
(FlightHub)

One-way from

$417
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$1,438

Good round-trip deal

$832 or less

Good one-way deal

$534 or less
Provider with most accurate pricing for Chicago (CHI)-Seoul (SEL) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Seoul (SEL) flights.
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From Illinois to Seoul (SEL)
Search Deals
One-way flight from Illinois to Seoul (SEL)
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High demand for flights, 5% potential price rise
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($65 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Seoul (SEL).
Search Deals
Price to beat on a one-way flight from Illinois to Seoul (SEL).
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Seoul 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, Cheapflights users made 2,558,603 searches. Data last updated March 24, 2026.
Use the filters below to find and compare flights from Illinois to Seoul that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/4

9:16 am-4:20 am

2 stops29h 04m

Incheon Intl

Fri 4/17

4:50 pm-10:45 am

2 stops31h 55m

$1,063

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 4/15

7:00 am-3:20 pm

1 stop18h 20m

Incheon Intl

Wed 4/22

7:20 pm-12:25 am

1 stop19h 05m

$1,066

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/16

6:19 am-4:50 pm

2 stops20h 31m

Incheon Intl

Wed 4/22

7:20 pm-12:25 am

1 stop19h 05m

$1,071

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 4/21

4:30 pm-4:20 am

2 stops21h 50m

Incheon Intl

Tue 4/28

4:50 pm-8:25 am

2 stops29h 35m

$1,071

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 4/10

6:29 am-5:20 pm

1 stop20h 51m

Incheon Intl

Thu 4/16

7:20 pm-12:25 am

1 stop19h 05m

$1,141

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Thu 9/10

8:42 pm-11:30 am

2 stops24h 48m

Incheon Intl

Tue 9/15

8:35 pm-7:00 am

2 stops24h 25m

$1,148

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 5/6

7:06 pm-4:20 am

1 stop19h 14m

Incheon Intl

Wed 5/13

4:50 pm-5:47 am

1 stop26h 57m

$1,160

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Mon 8/31

1:33 pm-4:20 am

2 stops24h 47m

Incheon Intl

Wed 9/9

11:30 am-4:56 pm

2 stops19h 26m

$1,177

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/16

11:15 am-4:20 am

2 stops27h 05m

Incheon Intl

Wed 4/22

11:30 am-8:54 pm

2 stops23h 24m

$1,201

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/18

7:05 pm-4:20 am

1 stop19h 15m

Incheon Intl

Sun 4/26

11:30 am-5:50 am

1 stop32h 20m

$1,208

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Illinois to Seoul

Have a flexible travel schedule? Discover the best time to fly to Seoul from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Seoul

What is the cheapest month to book a flight from Illinois to Seoul?

Currently, October is the cheapest month in which you can book a flight from Illinois to Seoul (average of $197). Flying from Illinois to Seoul in June is currently the most expensive (average of $1,029). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to SEL?

Find hourly flight availability from Illinois to Seoul. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 24, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Seoul as you normally would.

How much does it cost to fly round-trip from Illinois to Seoul?

Related info for your journey

Find useful and relevant information for your journey from Illinois to Seoul. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to Seoul?

    There are many flights that can get you from Illinois to Seoul in 18h 20m. Fly via Air Canada, United Airlines, or Delta to get the fastest option. Airlines will cover a distance of 6670 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Illinois to Seoul one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $468. Users have also found prices from $491 and $551 on Turkish Airlines and EVA Air, respectively.

  • What are the most popular routes from Illinois to Seoul?

    The most popular flight routes from Illinois to Seoul are Chicago O'Hare Intl - Incheon Intl, Chicago O'Hare Intl - Seoul Gimpo Intl and Chicago Midway - Incheon Intl.

  • What are the most reliable airlines from Illinois to Seoul?

    Before booking your flight to Seoul from Illinois, check out the most reliable airlines to get you to your destination on time: Korean Air (72%), Delta (65%), Atlas Air( 49%).

  • What are the cheapest flights from Illinois to Seoul?

    While on average a flight from Illinois to Seoul is generally $2,089, our data shows the cheapest flight currently is $383. When looking at the most popular route, (Chicago O'Hare Intl - Incheon Intl), you can expect to pay $877 for that flight.

  • Can I find deals for flights from Illinois to Seoul that include hotel bookings?

    Yes. In addition to deals on Illinois to Seoul flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Seoul?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Seoul.

  • Can I find deals for business class flights from Illinois to Seoul?

    Yes. Cheapflights offers flight deals from Illinois to Seoul by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to Seoul?

    Currently, October is the cheapest month in which you can book a flight from Illinois to Seoul (average of $197). Flying from Illinois to Seoul in June is currently the most expensive (average of $1,029). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 10 airlines flying from Illinois to Seoul

Discover the top 10 airlines that operate flights from Illinois to Seoul. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,886FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,996FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$918FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$877Average$1,134FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$915Average$1,612FlexibilityNo cancel feeOn-time71%
Japan AirlinesCheapest$931Average$1,416FlexibilityNo cancel feeOn-time79%
EVA AirCheapest$948Average$1,229FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,072Average$1,271FlexibilityNo cancel feeOn-time67%
Asiana AirlinesCheapest$1,234Average$1,726FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,594Average$1,902FlexibilityNo cancel feeOn-time81%

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