HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seoul

$312+ 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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEL
Aug 7 — Aug 141
Thu 8/7
Thu 8/14
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 August 2, 2025.

Round-trip from

$760
(Gurufare)

One-way from

$312
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$1,414

Good round-trip deal

$834 or less

Good one-way deal

$458 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. 2% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($54 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 2, 2025.

This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/214:00 pmORD - ICN
1 stop37h 05mCathay Pacific
Sun 9/143:10 pmICN - ORD
1 stop37h 15mCathay Pacific
Deal found 7/31$760
This Expedia deal was found by Cheapflights users on 8/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/161:30 pmSTL - ICN
2 stops36h 35mAir Canada
Tue 9/235:45 pmICN - STL
2 stops40h 12mAir Canada
Deal found 8/1$771
This American Airlines deal was found by Cheapflights users on 8/1. 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.
Mon 9/15:15 amSTL - ICN
1 stop20h 15mAmerican Airlines
Sat 9/205:25 pmICN - STL
1 stop19h 02mAmerican Airlines
Deal found 8/1$845
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/15:49 pmSTL - ICN
1 stop20h 31mUnited Airlines
Tue 9/3011:30 amICN - STL
1 stop19h 24mUnited Airlines
Deal found 7/31$856
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/198:01 pmSTL - GMP
2 stops24h 44mJapan Airlines
Fri 9/197:55 amGMP - STL
2 stops26h 37mJapan Airlines
Deal found 7/31$865
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/131:40 pmORD - ICN
2 stops39h 05mMultiple Airlines
Sat 9/2012:45 pmICN - ORD
1 stop19h 29mMultiple Airlines
Deal found 7/30$866
This United Airlines deal was found by Cheapflights users on 8/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:30 amMLI - ICN
2 stops31h 50mUnited Airlines
Sat 9/2011:30 amICN - MLI
2 stops47h 42mUnited Airlines
Deal found 8/1$919
This American Airlines deal was found by Cheapflights users on 8/1. 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.
Thu 9/46:30 amMLI - ICN
1 stop19h 00mAmerican Airlines
Sat 9/205:25 pmICN - MLI
1 stop18h 07mAmerican Airlines
Deal found 8/1$940
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.
Sun 11/231:30 pmSTL - ICN
1 stop25h 15mDelta
Mon 12/17:30 pmICN - STL
1 stop18h 32mDelta
Deal found 7/30$945
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/44:59 pmMLI - ICN
1 stop21h 01mDelta
Sat 9/206:50 pmICN - MLI
1 stop17h 52mDelta
Deal found 7/31$1,072
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/1412:30 amORD - GMP
1 stop27h 40mEVA Air
Wed 9/248:20 pmGMP - ORD
1 stop38h 25mEVA Air
Deal found 7/31$1,085
This oojo deal was found by Cheapflights users on 8/1. 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.
Wed 10/158:42 amSTL - ICN
2 stops46h 28mCathay Pacific
Tue 10/213:10 pmICN - STL
2 stops42h 13mCathay Pacific
Deal found 8/1$1,101

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 2, 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

Thu 8/21

4:00 pm-7:05 pm

1 stop37h 05m

Incheon Intl

Sun 9/14

3:10 pm-2:25 pm

1 stop37h 15m

$760

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 9/1

7:59 pm-3:30 pm

2 stops29h 31m

Incheon Intl

Sat 9/20

5:25 pm-8:15 pm

1 stop16h 50m

$845

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

5:29 pm-5:40 am

1 stop21h 11m

Incheon Intl

Thu 11/27

6:00 pm-4:27 pm

1 stop37h 27m

$855

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 8/19

8:01 pm-10:45 am

2 stops24h 44m

Seoul Gimpo Intl

Fri 9/19

7:55 am-8:32 pm

2 stops26h 37m

$865

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sat 9/13

1:40 pm-6:45 pm

2 stops39h 05m

Incheon Intl

Sat 9/20

12:45 pm-6:14 pm

1 stop19h 29m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 11/25

6:30 am-3:30 pm

1 stop18h 00m

Incheon Intl

Wed 12/3

8:05 pm-12:37 am

2 stops19h 32m

$871

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Thu 9/4

6:30 am-4:20 am

2 stops31h 50m

Incheon Intl

Sat 9/20

11:30 am-9:12 pm

2 stops47h 42m

$919

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Thu 9/4

6:30 am-3:30 pm

1 stop19h 00m

Incheon Intl

Sat 9/20

5:25 pm-9:32 pm

1 stop18h 07m

$940

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 9/15

4:05 pm-4:05 pm

2 stops34h 00m

Incheon Intl

Mon 9/22

5:45 pm-3:18 pm

2 stops35h 33m

$998

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Thu 9/4

4:59 pm-4:00 am

1 stop21h 01m

Incheon Intl

Sat 9/20

6:50 pm-10:42 pm

1 stop17h 52m

$1,072

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 49 results
1
2
3
...
5

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 $998). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,635). 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 2, 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 August 2, 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).

Reviews of airlines servicing Seoul

Get insights into the airlines that provide service to Seoul. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seoul. Reviews last updated August 2, 2025.
Peruse reviews from past customers who have flown with EVA Air, Korean Air, and ANA from Illinois to Seoul to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very good
1,220 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Korean Air
8.4
Very good
1,122 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
ANA
8.4
Very good
922 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Japan Airlines
8.3
Very good
1,541 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Delta
8.0
Very good
7,983 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

Entertainment

8.0

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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.

  • 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 $384. Users have also found prices from $448 and $453 on Delta and Japan Airlines, 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 (88%), Korean Air (81%), Atlas Air( 25%).

  • What are the cheapest flights from Illinois to Seoul?

    While on average a flight from Illinois to Seoul is generally $2,179, our data shows the cheapest flight currently is $382. When looking at the most popular route, (Chicago O'Hare Intl - Incheon Intl), you can expect to pay $727 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 $998). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,635). 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.
John F Kennedy Intl to Incheon Intl flights
Los Angeles to Incheon Intl flights
Dallas/Fort Worth to Incheon Intl flights
Seattle to Incheon Intl flights
Dulles Intl to Incheon Intl flights
San Francisco to Incheon Intl flights
LaGuardia to Incheon Intl flights
John F Kennedy Intl to Gimpo Intl flights
Newark to Incheon Intl flights
Los Angeles to Gimpo Intl flights
O'Hare Intl to Incheon Intl flights
Newark to Gimpo Intl flights
San Francisco to Gimpo Intl flights
Seattle to Gimpo Intl flights
Atlanta to Incheon Intl flights
Boston to Incheon Intl flights
LaGuardia to Gimpo Intl flights
Love Field to Incheon Intl flights
Ontario to Incheon Intl flights
San Jose to Incheon Intl flights
Reagan-National to Incheon Intl flights
Hobby to Incheon Intl flights
Las Vegas to Incheon Intl flights
Oakland to Incheon Intl flights
Dulles Intl to Gimpo Intl flights
Baltimore to Incheon Intl flights
Dallas/Fort Worth to Gimpo Intl flights
Honolulu to Incheon Intl flights
Minneapolis to Incheon Intl flights
Orlando to Incheon Intl flights
O'Hare Intl to Gimpo Intl flights
Santa Ana to Incheon Intl flights
Burbank to Incheon Intl flights
Denver to Incheon Intl flights
George Bush Intcntl to Incheon Intl flights
Philadelphia to Incheon Intl flights
Detroit to Incheon Intl flights
Charlotte to Incheon Intl flights
Reagan-National to Gimpo Intl flights
San Diego to Incheon Intl flights
Atlanta to Gimpo Intl flights
Orlando to Gimpo Intl flights
Las Vegas to Gimpo Intl flights
Baltimore to Gimpo Intl flights
George Bush Intcntl to Gimpo Intl flights
Boston to Gimpo Intl flights
San Jose to Gimpo Intl flights
Salt Lake City to Incheon Intl flights
Midway to Incheon Intl flights

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 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$660Average$1,016FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$805Average$928FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$848Average$1,035FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$891Average$1,299FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$895Average$1,026FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,080Average$1,343FlexibilityNo cancel feeOn-time74%
DeltaCheapest$1,097Average$1,909FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$1,110Average$1,394FlexibilityNo cancel feeOn-time76%
Asiana AirlinesCheapest$1,271Average$1,405FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,505Average$1,860FlexibilityNo 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.