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$403+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEL
Aug 31 — Sep 71
Mon 8/31
Mon 9/7
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 August 1, 2026.

This CheapTickets deal was found by Cheapflights users on 7/31. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:30 am
ORD
-
ICN
2 stops25h 10m
Multiple Airlines
Sat 9/266:00 pm
ICN
-
ORD
2 stops29h 20m
Multiple Airlines
Deal found 7/31$841
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Sat 8/295:30 pm
ORD
-
ICN
1 stop35h 15m
Multiple Airlines
Sat 9/56:00 pm
ICN
-
ORD
2 stops25h 59m
Multiple Airlines
Deal found 7/31$875
This Trip.com deal was found by Cheapflights users on 7/31. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am
ORD
-
ICN
2 stops23h 40m
Multiple Airlines
Sat 10/36:00 pm
ICN
-
ORD
2 stops29h 20m
Multiple Airlines
Deal found 7/31$878
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Sat 8/225:30 pm
ORD
-
ICN
1 stop35h 15m
Multiple Airlines
Sat 9/56:00 pm
ICN
-
ORD
2 stops25h 59m
Multiple Airlines
Deal found 7/31$890
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Sun 9/205:30 pm
ORD
-
ICN
1 stop35h 15m
WestJet
Sun 10/48:45 pm
ICN
-
ORD
1 stop33h 55m
WestJet
Deal found 7/31$916
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Sun 9/205:30 pm
ORD
-
ICN
1 stop35h 15m
WestJet
Mon 10/58:45 pm
ICN
-
ORD
1 stop33h 55m
WestJet
Deal found 7/31$917
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Sat 9/196:30 am
ORD
-
ICN
2 stops23h 40m
Multiple Airlines
Sun 10/48:45 pm
ICN
-
ORD
1 stop33h 55m
Multiple Airlines
Deal found 7/31$919
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Sat 9/196:30 am
ORD
-
ICN
2 stops23h 40m
Multiple Airlines
Mon 10/58:45 pm
ICN
-
ORD
1 stop33h 55m
Multiple Airlines
Deal found 7/31$920
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 9/166:30 am
ORD
-
ICN
2 stops25h 10m
Multiple Airlines
Sun 10/48:45 pm
ICN
-
ORD
1 stop33h 55m
Multiple Airlines
Deal found 7/31$921
This FlightHub deal was found by Cheapflights users on 7/29. 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 9/612:30 am
ORD
-
GMP
1 stop27h 40m
EVA Air
Wed 9/168:20 pm
GMP
-
ORD
1 stop38h 25m
EVA Air
Deal found 7/29$1,101
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/52:30 pm
STL
-
ICN
1 stop23h 30m
Delta
Wed 11/49:35 am
ICN
-
STL
1 stop26h 16m
Delta
Deal found 7/30$1,107
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:25 am
MDW
-
ICN
2 stops32h 00m
Multiple Airlines
Sat 10/106:00 pm
ICN
-
MDW
2 stops30h 58m
Multiple Airlines
Deal found 7/30$1,109

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 August 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$841
(CheapTickets)

One-way from

$403
(Super.com)

Popular in

December

Cheapest in

January

Average price

$1,375

Good round-trip deal

$958 or less

Good one-way deal

$474 or less
Provider with most accurate pricing for Chicago (CHI)-Seoul (SEL) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Seoul (SEL) flights.
Search Deals
From Illinois to Seoul (SEL)
Search Deals
One-way flight from Illinois to Seoul (SEL)
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($7 potential increase over avg. RT price).
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 August 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).
Search Deals

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 August 1, 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

Mon 10/5

2:30 pm-4:00 am

1 stop23h 30m

Incheon Intl

Wed 11/4

9:35 am-8:51 pm

1 stop26h 16m

$1,107

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 10/26

6:47 am-4:50 pm

1 stop20h 03m

Incheon Intl

Wed 11/25

9:35 am-1:23 pm

1 stop18h 48m

$1,107

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 8/26

3:39 pm-4:00 am

1 stop22h 21m

Incheon Intl

Wed 9/2

6:50 pm-11:21 pm

1 stop18h 31m

$1,107

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 10/13

9:47 am-5:20 pm

1 stop17h 33m

Incheon Intl

Mon 11/2

7:25 pm-11:54 pm

1 stop19h 29m

$1,107

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 8/25

11:15 am-4:20 am

2 stops27h 05m

Incheon Intl

Tue 9/1

11:30 am-5:06 pm

2 stops19h 36m

$1,111

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 8/10

6:00 am-5:20 pm

2 stops21h 20m

Incheon Intl

Mon 8/24

7:20 pm-12:41 am

1 stop19h 21m

$1,111

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Mon 8/24

11:43 am-12:25 am

2 stops46h 42m

Incheon Intl

Sat 9/5

3:10 pm-11:26 pm

2 stops46h 16m

$1,131

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Sun 9/13

12:08 pm-10:25 pm

2 stops44h 17m

Incheon Intl

Sun 9/20

8:05 pm-11:18 pm

2 stops41h 13m

$1,131

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Mon 8/24

5:09 pm-4:00 am

1 stop20h 51m

Incheon Intl

Sat 9/5

6:50 pm-10:19 pm

1 stop17h 29m

$1,157

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Fri 9/4

12:30 am-6:45 pm

1 stop28h 15m

Incheon Intl

Sun 9/13

12:00 pm-8:45 pm

1 stop22h 45m

$1,163

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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, November is the cheapest month in which you can book a flight from Illinois to Seoul (average of $1,155). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,875). 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 August 1, 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.

Weekly flight availability from Illinois to Seoul

Explore weekly flight availability from Illinois to Seoul. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 1, 2026.

The most flights from USIL to SEL are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

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

Airfare is below average for this route at the moment.
Illinois to Seoul flights typically cost between $1,230 and $1,347 in September.
The cheapest round-trip price found within the last 5 days was $841 on Multiple Airlines (Sep 23-Sep 26).

How far ahead should I book a flight from Illinois to Seoul?

The price you pay for your flight from Illinois to Seoul may vary depending on when you book. For the best chance of a lower fare, look to book 22 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 23h 30m. Fly via Delta, Cathay Pacific, or EVA Air 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 WestJet. According to our data, you can fly for as low as $395. Users have also found prices from $468 and $543 on American 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: Delta (87%), Korean Air (59%), Atlas Air( 15%).

  • What are the cheapest flights from Illinois to Seoul?

    While on average a flight from Illinois to Seoul is generally $3,281, our data shows the cheapest flight currently is $407. When looking at the most popular route, (Chicago O'Hare Intl - Incheon Intl), you can expect to pay $812 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, November is the cheapest month in which you can book a flight from Illinois to Seoul (average of $1,155). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,875). 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

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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 August 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,803FlexibilityNo cancel feeOn-timeN/A
Cathay PacificCheapest$639Average$930FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$845Average$1,119FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$916Average$1,319FlexibilityNo cancel feeOn-time71%
Japan AirlinesCheapest$931Average$1,443FlexibilityNo cancel feeOn-time79%
EVA AirCheapest$947Average$1,217FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,072Average$1,490FlexibilityNo cancel feeOn-time67%
Asiana AirlinesCheapest$1,148Average$1,728FlexibilityNo cancel feeOn-time76%
FinnairCheapest$1,174Average$1,356FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$1,191Average$1,542FlexibilityNo cancel feeOn-time69%

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