HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$321+ 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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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.

Find 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 October 30, 2025.

This SmartFares deal was found by Cheapflights users on 10/30. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/78:35 pmICN - ORD
1 stop18h 49mAlaska Airlines
Thu 11/278:00 amORD - ICN
1 stop19h 35mAlaska Airlines
Deal found 10/30$558
This American Airlines deal was found by Cheapflights users on 10/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:15 pmICN - ORD
2 stops30h 49mAmerican Airlines
Wed 12/315:15 amORD - ICN
1 stop20h 30mAmerican Airlines
Deal found 10/28$561
This American Airlines deal was found by Cheapflights users on 10/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/77:15 pmICN - ORD
1 stop19h 22mAmerican Airlines
Tue 11/185:18 amORD - ICN
1 stop20h 27mAmerican Airlines
Deal found 10/28$568
This American Airlines deal was found by Cheapflights users on 10/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/107:15 pmICN - ORD
1 stop19h 20mAmerican Airlines
Tue 12/308:58 pmORD - ICN
1 stop28h 47mAmerican Airlines
Deal found 10/27$569
This American Airlines deal was found by Cheapflights users on 10/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/77:15 pmICN - ORD
1 stop19h 22mAmerican Airlines
Mon 11/249:10 pmORD - ICN
1 stop28h 35mAmerican Airlines
Deal found 10/29$570
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/88:35 pmICN - ORD
1 stop18h 49mAlaska Airlines
Sun 11/166:00 amORD - ICN
1 stop21h 35mAlaska Airlines
Deal found 10/28$577
This United Airlines deal was found by Cheapflights users on 10/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/412:45 pmICN - ORD
2 stops21h 08mUnited Airlines
Wed 11/262:40 pmORD - ICN
2 stops24h 00mUnited Airlines
Deal found 10/29$589
This United Airlines deal was found by Cheapflights users on 10/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:00 pmICN - ORD
1 stop20h 14mUnited Airlines
Sun 2/87:58 pmORD - ICN
1 stop29h 17mUnited Airlines
Deal found 10/28$590
This United Airlines deal was found by Cheapflights users on 10/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:00 pmICN - ORD
1 stop17h 05mUnited Airlines
Fri 1/26:15 amORD - ICN
1 stop19h 00mUnited Airlines
Deal found 10/30$591
This American Airlines deal was found by Cheapflights users on 10/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/177:15 pmICN - STL
2 stops29h 05mAmerican Airlines
Sun 11/306:13 pmSTL - ICN
1 stop31h 32mAmerican Airlines
Deal found 10/28$618
This Delta deal was found by Cheapflights users on 10/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/297:30 pmICN - STL
1 stop17h 36mDelta
Tue 12/28:05 pmSTL - ICN
2 stops29h 25mDelta
Deal found 10/28$620
This American Airlines deal was found by Cheapflights users on 10/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/295:55 pmICN - STL
1 stop16h 58mAmerican Airlines
Tue 12/25:17 amSTL - ICN
1 stop20h 28mAmerican Airlines
Deal found 10/28$624

Cheap flight deals from Seoul to Illinois

Keep the following information in mind while searching for Seoul to Illinois flight deals. Data was last updated October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$561
(American Airlines)

One-way from

$321
(Kiwi.com)

Popular in

January

Cheapest in

November

Average price

$894

Good round-trip deal

$1,216 or less

Good one-way deal

$3,248 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. 2% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 30, 2025.
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

IncheonMoline

ICN - MLI

ICNMLI

Incheon Intl

Fri 2/6

6:00 pm-10:12 am

2 stops31h 12m

Moline Quad-City

Tue 2/10

8:46 am-5:40 am

2 stops29h 54m

$589

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 12/22

12:45 pm-11:14 pm

1 stop25h 29m

Chicago O'Hare Intl

Sun 12/28

7:45 pm-4:15 pm

1 stop29h 30m

$589

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 2/2

6:00 pm-5:44 am

1 stop26h 44m

Chicago O'Hare Intl

Fri 2/13

6:25 am-4:15 pm

1 stop18h 50m

$589

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Fri 12/26

6:00 pm-1:09 am

1 stop22h 09m

Chicago O'Hare Intl

Fri 2/13

4:10 pm-5:40 am

1 stop22h 30m

$590

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 11/24

6:00 pm-12:59 am

1 stop21h 59m

Chicago O'Hare Intl

Wed 1/14

4:16 pm-5:40 am

1 stop22h 24m

$590

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 12/23

12:45 pm-11:25 am

1 stop37h 40m

Chicago O'Hare Intl

Fri 2/6

2:40 pm-5:40 am

1 stop24h 00m

$592

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Wed 12/10

12:45 pm-7:44 pm

1 stop21h 59m

Chicago O'Hare Intl

Mon 12/29

6:25 pm-4:15 pm

1 stop30h 50m

$592

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Thu 12/25

6:00 pm-1:09 am

1 stop22h 09m

Chicago O'Hare Intl

Wed 2/11

9:00 am-5:40 am

1 stop29h 40m

$596

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 12/23

6:00 pm-1:09 am

1 stop22h 09m

Chicago O'Hare Intl

Thu 2/12

12:46 pm-5:40 am

1 stop25h 54m

$598

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Thu 12/25

6:00 pm-1:09 am

1 stop22h 09m

Chicago O'Hare Intl

Thu 2/12

4:45 pm-5:40 am

1 stop21h 55m

$598

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

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 $201). Flying from Seoul to Illinois in July is currently the most expensive (average of $980). 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 October 30, 2025.

It’s typically best to fly out from Seoul to Illinois in the afternoon. Doing so could potentially save you 24% on the flight price compared to flying at noon, which is usually more expensive.

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 October 30, 2025.
Read reviews from past customers who have flown Korean Air, Asiana 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
1,155 reviews

Comfort

8.3

Food

8.1

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

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
1,155 reviews
Korean Air
8.4
Very good
1,155 reviews

Comfort

8.3

Food

8.1

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

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!!
Asiana Airlines
8.2
Very good
484 reviews
Korean Air
8.4
Very good
1,155 reviews

Comfort

8.3

Food

8.1

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

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
7,998 reviews
Korean Air
8.4
Very good
1,155 reviews

Comfort

8.3

Food

8.1

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

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!!
American Airlines
7.2
Good
11,034 reviews
Korean Air
8.4
Very good
1,155 reviews

Comfort

8.3

Food

8.1

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

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
10,383 reviews
Korean Air
8.4
Very good
1,155 reviews

Comfort

8.3

Food

8.1

Entertainment

8.2

Boarding

8.5

Overall

8.4

Crew

8.7

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 28h 34m. The distance between Seoul and Illinois is about 6670 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $777. On average you can expect to pay $2,405. The most popular route, (Incheon Intl - Chicago O'Hare Intl), can usually be booked for $566.

  • 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 $201). Flying from Seoul to Illinois in July is currently the most expensive (average of $980). 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 Honolulu flights
Incheon Intl to Seattle flights
Incheon Intl to LaGuardia flights
Incheon Intl to Dulles Intl flights
Incheon Intl to Newark flights
Incheon Intl to San Francisco flights
Gimpo Intl to John F Kennedy Intl flights
Incheon Intl to Dallas/Fort Worth flights
Incheon Intl to Las Vegas flights
Gimpo Intl to Los Angeles flights
Incheon Intl to O'Hare Intl flights
Incheon Intl to Boston flights
Gimpo Intl to Honolulu flights
Incheon Intl to Ontario flights
Incheon Intl to Atlanta flights
Incheon Intl to Reagan-National flights
Incheon Intl to Santa Ana flights
Incheon Intl to Baltimore flights
Incheon Intl to Hobby flights
Incheon Intl to Burbank flights
Gimpo Intl to San Francisco flights
Gimpo Intl to Newark flights
Incheon Intl to Orlando flights
Incheon Intl to Miami flights
Incheon Intl to Midway flights
Incheon Intl to Love Field flights
Gimpo Intl to O'Hare Intl flights
Incheon Intl to Portland flights
Incheon Intl to Austin flights
Incheon Intl to San Diego flights
Incheon Intl to San Jose flights
Incheon Intl to George Bush Intcntl flights
Incheon Intl to Tucson flights
Incheon Intl to Tampa flights
Incheon Intl to Sky Harbor Intl flights
Incheon Intl to San Antonio flights
Incheon Intl to Panama City flights
Incheon Intl to Minneapolis flights
Gimpo Intl to Boston flights
Incheon Intl to Salt Lake City flights
Incheon Intl to Detroit flights
Incheon Intl to Oakland flights

Top 5 airlines flying from Seoul to Illinois

Discover the top 5 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$229Average$1,356FlexibilityNo cancel feeOn-timeN/A
Asiana AirlinesCheapest$558Average$1,047FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$593Average$959FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$730Average$1,053FlexibilityNo cancel feeOn-time67%
Korean AirCheapest$787Average$1,408FlexibilityNo 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.