HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seoul

$330+ 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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEL
oct. 15 — oct. 221
mié. 10/15
mié. 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Seoul with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Illinois to Seoul

Keep the following information in mind while searching for Illinois to Seoul flight deals. Data was last updated septiembre 15, 2025.

Round-trip from

$725
(lol.travel)

One-way from

$330
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$1,238

Good round-trip deal

$847 or less

Good one-way deal

$504 or less
From Illinois to Seoul (SEL)
Search Deals
One-way flight from Illinois to Seoul (SEL)
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($75 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($64 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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

Find 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 septiembre 15, 2025.

This eDestinos deal was found by Cheapflights users on 9/13. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/14:00 pmORD - ICN
1 stop30h 40mCathay Pacific
mar. 10/1410:10 amICN - ORD
1 stop42h 15mCathay Pacific
Deal found 9/13$704
This lol.travel deal was found by Cheapflights users on 9/14. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/294:00 pmORD - ICN
1 stop30h 40mCathay Pacific
lun. 10/138:05 pmICN - ORD
1 stop32h 20mCathay Pacific
Deal found 9/14$725
This eDestinos deal was found by Cheapflights users on 9/13. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/244:00 pmORD - ICN
1 stop32h 05mCathay Pacific
mar. 9/303:10 pmICN - ORD
1 stop37h 15mCathay Pacific
Deal found 9/13$726
This oojo deal was found by Cheapflights users on 9/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/234:00 pmORD - ICN
1 stop39h 10mCathay Pacific
mié. 11/123:00 pmICN - ORD
1 stop37h 00mCathay Pacific
Deal found 9/13$730
This FlightHub deal was found by Cheapflights users on 9/15. 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.
mar. 10/214:00 pmORD - ICN
1 stop30h 40mCathay Pacific
lun. 11/107:35 pmICN - ORD
1 stop32h 25mCathay Pacific
Deal found 9/15$745
This oojo deal was found by Cheapflights users on 9/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/184:00 pmORD - ICN
1 stop37h 05mCathay Pacific
lun. 10/131:40 pmICN - ORD
1 stop38h 45mCathay Pacific
Deal found 9/15$754
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
dom. 11/166:30 amORD - ICN
1 stop42h 40mMultiple Airlines
dom. 11/309:20 pmICN - ORD
2 stops31h 15mMultiple Airlines
Deal found 9/12$758
This FlightHub deal was found by Cheapflights users on 9/15. 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.
mar. 9/164:00 pmORD - ICN
1 stop37h 05mCathay Pacific
mar. 9/303:10 pmICN - ORD
1 stop37h 15mCathay Pacific
Deal found 9/15$760
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/208:05 pmSTL - ICN
2 stops29h 25mAmerican Airlines
dom. 10/265:55 pmICN - STL
1 stop29h 25mAmerican Airlines
Deal found 9/13$825
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/273:59 pmSTL - ICN
1 stop33h 31mAmerican Airlines
dom. 10/265:55 pmICN - STL
1 stop29h 25mAmerican Airlines
Deal found 9/13$844
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/285:53 pmSTL - ICN
2 stops32h 02mAmerican Airlines
mar. 11/47:15 pmICN - STL
2 stops29h 05mAmerican Airlines
Deal found 9/13$849
This Delta deal was found by Cheapflights users on 9/15. 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.
vie. 10/246:50 amSTL - ICN
1 stop18h 30mDelta
sáb. 11/17:30 pmICN - STL
1 stop17h 37mDelta
Deal found 9/15$856

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 septiembre 15, 2025.
Use the filters below to find and compare flights from Illinois to Seoul that are best for you.

Fly from

Illinois

Fly to

Seoul

Route

Depart

Return

Price

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

mar. 3/3

2:40 pm-9:15 pm

1 stop39h 35m

Incheon Intl

jue. 3/12

7:35 pm-2:00 pm

1 stop32h 25m

$815

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

mar. 10/28

6:05 pm-3:55 pm

1 stop31h 50m

Incheon Intl

mar. 11/4

7:15 pm-9:20 am

2 stops29h 05m

$849

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

vie. 10/24

6:00 am-5:20 pm

1 stop21h 20m

Incheon Intl

sáb. 11/1

7:30 pm-11:07 pm

1 stop17h 37m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

jue. 10/30

5:24 pm-4:40 am

2 stops21h 16m

Incheon Intl

jue. 11/6

12:45 pm-4:27 pm

1 stop18h 42m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

jue. 10/2

6:00 am-6:35 pm

1 stop22h 35m

Incheon Intl

lun. 10/13

8:35 pm-12:03 am

1 stop17h 28m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 9/27

6:40 am-4:25 pm

1 stop19h 45m

Incheon Intl

dom. 10/26

7:25 pm-11:41 pm

1 stop18h 16m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

mié. 10/29

5:20 am-3:55 pm

1 stop20h 35m

Incheon Intl

mié. 11/5

7:15 pm-10:58 pm

1 stop18h 43m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 10/25

5:15 pm-4:55 am

1 stop21h 40m

Incheon Intl

sáb. 11/1

7:30 pm-11:07 pm

1 stop17h 37m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

vie. 10/24

6:50 am-3:20 pm

1 stop18h 30m

Incheon Intl

dom. 11/2

7:40 pm-12:24 am

1 stop19h 44m

$856

ChicagoIncheon

MDW - ICN

MDWICN

Chicago Midway

mar. 10/21

5:56 pm-4:55 am

1 stop20h 59m

Incheon Intl

lun. 10/27

9:55 pm-11:25 pm

1 stop39h 30m

$925

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
1
2
3
...
6

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, February is the cheapest month in which you can book a flight from Illinois to Seoul (average of $990). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,633). 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 septiembre 15, 2025.

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 septiembre 15, 2025.

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).

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 21h 20m. Fly via Cathay Pacific, American 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 United Airlines. According to our data, you can fly for as low as $448. Users have also found prices from $572 and $636 on Air Canada 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 (80%), Korean Air (65%), Atlas Air( 8%).

  • What are the cheapest flights from Illinois to Seoul?

    While on average a flight from Illinois to Seoul is generally $2,035, our data shows the cheapest flight currently is $403. When looking at the most popular route, (Chicago O'Hare Intl - Incheon Intl), you can expect to pay $725 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, February is the cheapest month in which you can book a flight from Illinois to Seoul (average of $990). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,633). 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.

Alternative routes for Illinois to Seoul

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Incheon Intl flights
Los Angeles to Incheon Intl flights
John F Kennedy Intl to Incheon Intl flights
Seattle to Incheon Intl flights
Reagan-National to Incheon Intl flights
Dallas/Fort Worth to Incheon Intl flights
Baltimore to Incheon Intl flights
San Francisco to Incheon Intl flights
LaGuardia to Incheon Intl flights
Los Angeles to Gimpo Intl flights
O'Hare Intl to Incheon Intl flights
John F Kennedy Intl to Gimpo Intl flights
Newark to Incheon Intl flights
San Francisco to Gimpo Intl flights
Dulles Intl to Gimpo Intl flights
Atlanta to Incheon Intl flights
Boston to Incheon Intl flights
Seattle to Gimpo Intl flights
Honolulu to Incheon Intl flights
Ontario to Incheon Intl flights
Hobby to Incheon Intl flights
Newark to Gimpo Intl flights
San Jose to Incheon Intl flights
Dallas/Fort Worth to Gimpo Intl flights
Santa Ana to Incheon Intl flights
Las Vegas to Incheon Intl flights
Reagan-National to Gimpo Intl flights
Burbank to Incheon Intl flights
Minneapolis to Incheon Intl flights
O'Hare Intl to Gimpo Intl flights
George Bush Intcntl to Incheon Intl flights
Love Field to Incheon Intl flights
LaGuardia to Gimpo Intl flights
Orlando to Incheon Intl flights
Detroit to Incheon Intl flights
Philadelphia to Incheon Intl flights
Denver to Incheon Intl flights
George Bush Intcntl to Gimpo Intl flights
Portland to Incheon Intl flights
San Diego to Incheon Intl flights
Salt Lake City to Incheon Intl flights
Baltimore to Gimpo Intl flights
Tampa to Incheon Intl flights
Atlanta to Gimpo Intl flights
San Jose to Gimpo Intl flights
Raleigh to Incheon Intl flights
Austin to Incheon Intl flights
Pittsburgh to Incheon Intl flights

Top 9 airlines flying from Illinois to Seoul

Discover the top 9 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 septiembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$297Average$1,016FlexibilityNo cancel feeOn-time69%
DeltaCheapest$297Average$1,906FlexibilityNo cancel feeOn-timeN/A
Cathay PacificCheapest$639Average$897FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$848Average$1,036FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$901Average$1,288FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$926Average$1,119FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,085Average$1,322FlexibilityNo cancel feeOn-time74%
FinnairCheapest$1,110Average$1,375FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,493Average$1,868FlexibilityNo cancel feeOn-time81%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.