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$367+ Cheap flights from South Korea 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 2/17. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ORD
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from South Korea to Illinois

Cheapest flights from South Korea to Illinois
Explore the most affordable flight options available from South Korea to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This American Airlines deal was found by Cheapflights users on 12/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:15 pmICN - ORD
2 stops27h 02mAmerican Airlines
Wed 2/116:54 amORD - ICN
1 stop18h 51mAmerican Airlines
Deal found 12/15$578
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:35 pmICN - ORD
1 stop24h 54mMultiple Airlines
Thu 2/127:00 amORD - ICN
1 stop20h 35mMultiple Airlines
Deal found 12/15$584
This United Airlines deal was found by Cheapflights users on 12/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:45 pmICN - ORD
2 stops25h 27mUnited Airlines
Thu 2/124:20 pmORD - ICN
1 stop22h 20mUnited Airlines
Deal found 12/15$620
This Asiana Airlines deal was found by Cheapflights users on 12/15. 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 Asiana Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/259:00 pmICN - STL
1 stop17h 59mMultiple Airlines
Mon 1/55:26 pmSTL - ICN
1 stop20h 54mMultiple Airlines
Deal found 12/15$697
This United Airlines deal was found by Cheapflights users on 12/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:45 pmICN - STL
1 stop18h 59mUnited Airlines
Mon 1/55:45 pmSTL - ICN
2 stops31h 30mUnited Airlines
Deal found 12/15$729
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2412:45 pmICN - ORD
2 stops26h 14mUnited Airlines
Tue 12/309:40 pmORD - ICN
2 stops27h 35mUnited Airlines
Deal found 12/14$746
This United Airlines deal was found by Cheapflights users on 12/15. 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 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
Thu 2/126:25 amORD - ICN
1 stop18h 50mUnited Airlines
Deal found 12/15$756
This United Airlines deal was found by Cheapflights users on 12/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2612:45 pmICN - ORD
1 stop27h 24mUnited Airlines
Sat 1/39:05 pmORD - ICN
1 stop41h 35mUnited Airlines
Deal found 12/13$779
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2112:45 pmICN - ORD
2 stops35h 59mUnited Airlines
Mon 1/124:16 pmORD - ICN
1 stop22h 24mUnited Airlines
Deal found 12/14$780
This American Airlines deal was found by Cheapflights users on 12/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/237:15 pmICN - ORD
2 stops26h 05mAmerican Airlines
Fri 2/65:05 amORD - ICN
1 stop20h 40mAmerican Airlines
Deal found 12/15$801
This American Airlines deal was found by Cheapflights users on 12/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:15 pmICN - ORD
1 stop30h 39mAmerican Airlines
Tue 12/306:52 pmORD - ICN
1 stop30h 53mAmerican Airlines
Deal found 12/14$802
This United Airlines deal was found by Cheapflights users on 12/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:00 pmICN - STL
2 stops19h 22mUnited Airlines
Tue 1/66:00 amSTL - ICN
2 stops32h 40mUnited Airlines
Deal found 12/14$830

Find flight deals from South Korea to Illinois

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

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$561
(Trip.com)

One-way from

$367
(Kiwi.com)

Popular in

January

Cheapest in

November

Average price

$830

Good round-trip deal

$1,320 or less

Good one-way deal

$1,123 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 South Korea to Illinois
Search Deals
One-way flight from South Korea to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($184 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($81 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from South Korea to Illinois.
Search Deals
Price to beat on a one-way flight from South Korea to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from South Korea 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 December 15, 2025.
Use the filters below to find and compare flights from South Korea to Illinois that are best for you.

Fly from

South Korea

Fly to

Illinois

Route

Depart

Return

Price

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Thu 1/29

8:35 pm-11:50 pm

1 stop18h 15m

Chicago O'Hare Intl

Thu 2/5

8:00 am-6:35 pm

1 stop19h 35m

$561

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 4/21

5:25 pm-9:27 am

1 stop30h 02m

Chicago O'Hare Intl

Thu 4/23

5:00 am-3:30 pm

1 stop20h 30m

$564

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Thu 1/29

12:45 pm-9:32 pm

1 stop23h 47m

Chicago O'Hare Intl

Thu 2/5

1:00 pm-5:40 am

2 stops25h 40m

$606

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 4/21

4:50 pm-9:38 pm

1 stop18h 48m

Chicago O'Hare Intl

Thu 4/23

7:45 pm-4:20 am

1 stop18h 35m

$606

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Thu 1/29

12:45 pm-6:48 pm

1 stop21h 03m

Chicago O'Hare Intl

Wed 2/11

6:29 pm-4:15 pm

1 stop30h 46m

$609

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Thu 12/25

12:45 pm-8:00 pm

2 stops22h 15m

Chicago O'Hare Intl

Thu 2/12

4:20 pm-5:40 am

1 stop22h 20m

$620

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Tue 4/14

5:25 pm-8:05 am

2 stops28h 40m

Lambert-St Louis

Tue 4/21

7:20 am-3:30 pm

1 stop18h 10m

$633

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 2/3

12:45 pm-6:46 pm

2 stops21h 01m

Chicago O'Hare Intl

Sat 2/14

2:40 pm-5:40 am

2 stops24h 00m

$640

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Sat 1/31

12:45 pm-5:04 pm

2 stops19h 19m

Chicago O'Hare Intl

Sun 2/15

8:20 pm-4:15 pm

1 stop28h 55m

$640

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 1/29

12:45 pm-10:00 pm

2 stops24h 15m

Lambert-St Louis

Thu 2/5

11:20 am-5:40 am

2 stops27h 20m

$661

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 60 results
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Best time to book a flight from South Korea to Illinois

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

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

Currently, August is the cheapest month in which you can book a flight from South Korea to Illinois (average of $201). Flying from South Korea to Illinois in January is currently the most expensive (average of $1,091). 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 KR to IL?

Find hourly flight availability from South Korea 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 December 15, 2025.

One of the essential ways to save on airfare from South Korea to Illinois is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 27% on airfare.

What is the cheapest day to fly from South Korea to Illinois?

Use this chart to determine the cheapest time to fly round-trip from South Korea to Illinois. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their South Korea to Illinois flight should consider departing on Tuesday mornings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from South Korea to Illinois

Explore weekly flight availability from South Korea 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 December 15, 2025.

The most flights from KR0 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 December 15, 2025.
Get a feel of what it's like to fly with Korean Air, Asiana Airlines, and Delta from South Korea to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,186 reviews

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Overall

8.4

Entertainment

8.2

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
1,186 reviews
Korean Air
8.4
Very good
1,186 reviews

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Overall

8.4

Entertainment

8.2

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
493 reviews
Korean Air
8.4
Very good
1,186 reviews

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Overall

8.4

Entertainment

8.2

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
8,010 reviews
Korean Air
8.4
Very good
1,186 reviews

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Overall

8.4

Entertainment

8.2

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
9,094 reviews
Korean Air
8.4
Very good
1,186 reviews

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Overall

8.4

Entertainment

8.2

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
10,527 reviews
Korean Air
8.4
Very good
1,186 reviews

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Overall

8.4

Entertainment

8.2

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 South Korea 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 South Korea to Illinois?

    There are many flights that can get you from South Korea to Illinois in 18h 15m. Fly via Hawaiian Airlines, American Airlines, or United Airlines to get the fastest option. South Korea and Illinois are separated by a distance of 6533 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 South Korea 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 Japan Airlines, with prices starting from $563 and $594, respectively.

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

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

  • How can I find direct flights from South Korea to Illinois?

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

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

    Yes. Cheapflights offers flight deals from South Korea 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 South Korea to Illinois?

    Currently, August is the cheapest month in which you can book a flight from South Korea to Illinois (average of $201). Flying from South Korea to Illinois in January is currently the most expensive (average of $1,091). 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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Alternative routes for South Korea to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from South Korea to Illinois

Discover the top 6 airlines that operate flights from South Korea 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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$197Average$590FlexibilityNo cancel feeOn-time75%
DeltaCheapest$229Average$1,356FlexibilityNo cancel feeOn-timeN/A
Asiana AirlinesCheapest$558Average$1,047FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$586Average$663FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$687Average$1,338FlexibilityNo cancel feeOn-time81%
Air CanadaCheapest$730Average$1,053FlexibilityNo cancel feeOn-time67%

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