HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$393+ Cheap flights from Seoul (SEL) to Illinois

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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ORD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seoul to Illinois 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 Seoul to Illinois

Cheapest flights from Seoul to Illinois
Explore the most affordable flight options available from Seoul to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This WhyPayMore deal was found by Cheapflights users on 1/28. 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 WhyPayMore is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/285:45 pm
ICN
-
ORD
1 stop35h 00m
Air Canada
Tue 6/27:50 pm
ORD
-
ICN
1 stop30h 15m
Air Canada
Deal found 1/28$657
This flugladen.de deal was found by Cheapflights users on 1/28. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:55 pm
ICN
-
ORD
1 stop34h 46m
Air Canada
Wed 3/48:00 am
ORD
-
ICN
1 stop19h 25m
Air Canada
Deal found 1/28$662
This Gotogate deal was found by Cheapflights users on 1/28. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:45 pm
ICN
-
ORD
2 stops35h 06m
Air Canada
Tue 10/133:40 pm
ORD
-
ICN
1 stop34h 25m
Air Canada
Deal found 1/28$672
This Hanatour deal was found by Cheapflights users on 1/27. 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 Hanatour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/295:45 pm
ICN
-
ORD
1 stop16h 13m
Air Canada
Tue 5/53:40 pm
ORD
-
ICN
1 stop34h 25m
Air Canada
Deal found 1/27$673
This Gotogate deal was found by Cheapflights users on 1/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:45 pm
ICN
-
STL
2 stops40h 20m
Air Canada
Sat 6/201:15 pm
STL
-
ICN
2 stops60h 50m
Air Canada
Deal found 1/27$675
This Hanatour deal was found by Cheapflights users on 1/28. 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 Hanatour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/145:45 pm
ICN
-
ORD
1 stop34h 58m
Air Canada
Tue 4/213:40 pm
ORD
-
ICN
1 stop34h 25m
Air Canada
Deal found 1/28$681
This WhyPayMore deal was found by Cheapflights users on 1/27. 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 WhyPayMore is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/145:45 pm
ICN
-
ORD
1 stop35h 04m
Air Canada
Mon 9/288:45 am
ORD
-
ICN
1 stop17h 20m
Air Canada
Deal found 1/27$687
This Air Canada deal was found by Cheapflights users on 1/26. 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 2/176:55 pm
ICN
-
ORD
1 stop34h 46m
Air Canada
Mon 2/233:35 pm
ORD
-
ICN
1 stop33h 25m
Air Canada
Deal found 1/26$688
This Air Canada deal was found by Cheapflights users on 1/27. 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 2/176:55 pm
ICN
-
ORD
1 stop34h 46m
Air Canada
Thu 2/193:35 pm
ORD
-
ICN
1 stop34h 35m
Air Canada
Deal found 1/27$697
This FlightHub deal was found by Cheapflights users on 1/28. 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 6/25:45 pm
ICN
-
ORD
1 stop35h 00m
Air Canada
Tue 9/298:00 pm
ORD
-
ICN
2 stops30h 05m
Air Canada
Deal found 1/28$699
This Asiana Airlines deal was found by Cheapflights users on 1/27. 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 Asiana Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:00 pm
ICN
-
STL
1 stop16h 59m
Multiple Airlines
Sun 4/197:00 am
STL
-
ICN
1 stop32h 15m
Multiple Airlines
Deal found 1/27$712
This Asiana Airlines deal was found by Cheapflights users on 1/29. 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 Asiana Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/99:00 pm
ICN
-
STL
1 stop16h 59m
Multiple Airlines
Mon 4/204:20 pm
STL
-
ICN
1 stop22h 55m
Multiple Airlines
Deal found 1/29$715

Find flight deals from Seoul to Illinois

Keep the following information in mind while searching for Seoul to Illinois flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$657
(WhyPayMore)

One-way from

$393
(Mytrip)

Popular in

January

Cheapest in

November

Average price

$1,647

Good round-trip deal

$1,389 or less

Good one-way deal

$1,146 or less
Provider with most accurate pricing for Seoul (SEL)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seoul (SEL)-Chicago (CHI) flights.
Search Deals
From Seoul (SEL) to Illinois
Search Deals
One-way flight from Seoul (SEL) to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($47 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Seoul (SEL) to Illinois.
Search Deals
Price to beat on a one-way flight from Seoul (SEL) to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seoul to Illinois 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 January 29, 2026.
Use the filters below to find and compare flights from Seoul to Illinois that are best for you.

Fly from

Seoul

Fly to

Illinois

Route

Depart

Return

Price

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 5/14

5:45 pm-8:05 pm

2 stops40h 20m

Lambert-St Louis

Sat 6/20

1:15 pm-4:05 pm

2 stops60h 50m

$675

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 4/13

9:00 pm-11:59 pm

1 stop16h 59m

Lambert-St Louis

Sun 4/19

7:00 am-5:15 am

1 stop32h 15m

$712

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Tue 4/14

9:00 pm-2:51 pm

1 stop31h 51m

Lambert-St Louis

Tue 4/21

7:00 am-5:15 am

1 stop32h 15m

$712

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 4/9

9:00 pm-11:59 pm

1 stop16h 59m

Lambert-St Louis

Mon 4/20

4:20 pm-5:15 am

1 stop22h 55m

$715

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Sun 5/31

7:05 pm-2:55 pm

1 stop33h 50m

Chicago O'Hare Intl

Thu 6/11

3:40 pm-4:05 pm

1 stop34h 25m

$716

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 4/13

9:00 pm-11:59 pm

1 stop16h 59m

Lambert-St Louis

Fri 4/24

4:46 pm-5:15 am

1 stop22h 29m

$766

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 2/23

8:10 pm-8:10 pm

2 stops39h 00m

Chicago O'Hare Intl

Sat 3/7

8:00 am-4:15 pm

2 stops41h 15m

$789

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 4/9

5:45 pm-3:24 pm

2 stops59h 39m

Lambert-St Louis

Mon 4/20

9:10 am-4:05 pm

2 stops40h 55m

$807

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Fri 4/10

5:45 pm-3:24 pm

2 stops35h 39m

Lambert-St Louis

Mon 4/20

6:30 am-4:05 pm

2 stops43h 35m

$807

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Fri 2/27

8:35 pm-11:56 pm

1 stop18h 21m

Chicago O'Hare Intl

Fri 3/6

5:29 pm-6:35 pm

1 stop34h 06m

$826

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

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

Best time to book a flight from Seoul to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Seoul 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 Seoul to Illinois

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

Currently, August is the cheapest month in which you can book a flight from Seoul to Illinois (average of $208). Flying from Seoul to Illinois in January is currently the most expensive (average of $1,041). 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 SEL to IL?

Find hourly flight availability from Seoul to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 29, 2026.

When flying from Seoul to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Seoul to Illinois

Explore weekly flight availability from Seoul to Illinois. 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 January 29, 2026.

The most flights from SEL to USIL 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 Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated January 29, 2026.
Read reviews from past customers who have flown Korean Air, Alaska Airlines, and Delta from Seoul to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,188 reviews

Comfort

8.3

Entertainment

8.2

Food

8.1

Boarding

8.5

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Korean Air
8.4
Very good
1,188 reviews
Korean Air
8.4
Very good
1,188 reviews

Comfort

8.3

Entertainment

8.2

Food

8.1

Boarding

8.5

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Alaska Airlines
8.0
Very good
11,808 reviews
Korean Air
8.4
Very good
1,188 reviews

Comfort

8.3

Entertainment

8.2

Food

8.1

Boarding

8.5

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Delta
7.9
Good
8,127 reviews
Korean Air
8.4
Very good
1,188 reviews

Comfort

8.3

Entertainment

8.2

Food

8.1

Boarding

8.5

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
United Airlines
7.4
Good
9,215 reviews
Korean Air
8.4
Very good
1,188 reviews

Comfort

8.3

Entertainment

8.2

Food

8.1

Boarding

8.5

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Air Canada
7.1
Good
10,667 reviews
Korean Air
8.4
Very good
1,188 reviews

Comfort

8.3

Entertainment

8.2

Food

8.1

Boarding

8.5

Crew

8.7

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!

Related info for your journey

Find useful and relevant information for your journey from Seoul to Illinois. 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 Seoul to Illinois?

    Departing from Seoul to Illinois will take you 26h 45m. The distance between Seoul and Illinois is about 6517 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $476 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Air Canada and Korean Air, with prices starting from $563 and $608, respectively.

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

    While some choose either Incheon Intl - Chicago Midway or Seoul Gimpo Intl - Chicago O'Hare Intl, Incheon Intl - Chicago O'Hare Intl is the most popular route from Seoul to Illinois.

  • What are the cheapest flights from Seoul to Illinois?

    The cheapest flight price from Seoul to Illinois is $1,059. On average you can expect to pay $1,330. The most popular route, (Incheon Intl - Chicago O'Hare Intl), can usually be booked for $644.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seoul to Illinois 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 Seoul to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Seoul to Illinois (average of $208). Flying from Seoul to Illinois in January is currently the most expensive (average of $1,041). 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 Seoul to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Incheon Intl to John F Kennedy Intl flights
Incheon Intl to Los Angeles flights
Incheon Intl to San Francisco flights
Incheon Intl to LaGuardia flights
Incheon Intl to Newark flights
Incheon Intl to Honolulu flights
Gimpo Intl to John F Kennedy Intl flights
Incheon Intl to Seattle flights
Incheon Intl to Dallas/Fort Worth flights
Gimpo Intl to Los Angeles flights
Incheon Intl to Dulles Intl flights
Incheon Intl to Las Vegas flights
Gimpo Intl to Honolulu flights
Incheon Intl to Ontario flights
Incheon Intl to Atlanta flights
Gimpo Intl to San Francisco flights
Incheon Intl to Boston flights
Incheon Intl to Santa Ana flights
Incheon Intl to O'Hare Intl flights
Incheon Intl to San Jose flights
Gimpo Intl to Newark flights
Incheon Intl to Burbank flights
Incheon Intl to Portland flights
Incheon Intl to Love Field flights
Incheon Intl to Detroit flights
Incheon Intl to Denver flights
Incheon Intl to Sky Harbor Intl flights
Incheon Intl to St. Louis flights
Incheon Intl to Dayton flights
Incheon Intl to Reagan-National flights
Incheon Intl to Orlando flights
Incheon Intl to Baltimore flights
Incheon Intl to Oakland flights
Incheon Intl to Salt Lake City flights
Incheon Intl to Midway flights
Incheon Intl to Kailua-Kona flights
Incheon Intl to San Antonio flights
Gimpo Intl to O'Hare Intl flights
Incheon Intl to Hobby flights
Incheon Intl to Philadelphia flights
Incheon Intl to Kansas City flights
Incheon Intl to Raleigh flights
Incheon Intl to Nashville flights
Incheon Intl to Miami flights
Incheon Intl to Minneapolis flights

Top 6 airlines flying from Seoul to Illinois

Discover the top 6 airlines that operate flights from Seoul to Illinois. 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$197Average$590FlexibilityNo cancel feeOn-time75%
DeltaCheapest$229Average$1,356FlexibilityNo cancel feeOn-timeN/A
Asiana AirlinesCheapest$558Average$1,137FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$586Average$663FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$687Average$1,376FlexibilityNo cancel feeOn-time81%
Air CanadaCheapest$730Average$1,062FlexibilityNo cancel feeOn-time67%

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.