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$355+ 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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ORD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap 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 September 11, 2025.

Round-trip from

$611
(Alaska Airlines)

One-way from

$355
(Kiwi.com)

Popular in

January

Cheapest in

February

Average price

$1,581

Good round-trip deal

$1,288 or less

Good one-way deal

$1,103 or less
From South Korea to Illinois
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One-way flight from South Korea to Illinois
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Highest demand for flights based on searches. 3% potential increase in price ($40 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($59 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from South Korea to Illinois.
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Price to beat on a one-way flight from South Korea to Illinois.
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Find 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 September 11, 2025.

This Travelocity deal was found by Cheapflights users on 9/9. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:00 pmICN - ORD
2 stops28h 00mAir Canada
Wed 9/248:25 pmORD - ICN
2 stops29h 50mAir Canada
Deal found 9/9$606
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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.
Fri 11/78:35 pmICN - ORD
2 stops47h 26mAlaska Airlines
Mon 11/108:59 pmORD - ICN
2 stops31h 26mAlaska Airlines
Deal found 9/11$611
This Trip.com deal was found by Cheapflights users on 9/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/294:10 pmICN - ORD
1 stop22h 14mMultiple Airlines
Tue 11/183:25 pmORD - ICN
1 stop33h 30mMultiple Airlines
Deal found 9/10$621
This Delta deal was found by Cheapflights users on 9/10. 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.
Tue 10/217:40 pmICN - STL
1 stop18h 44mDelta
Sat 10/254:45 pmSTL - ICN
1 stop32h 45mDelta
Deal found 9/10$637
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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.
Wed 11/129:25 pmICN - ORD
2 stops41h 34mAlaska Airlines
Wed 12/37:59 pmORD - ICN
2 stops55h 36mAlaska Airlines
Deal found 9/11$637
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Tue 12/169:00 pmICN - ORD
1 stop16h 30mMultiple Airlines
Wed 2/116:50 pmORD - ICN
1 stop19h 30mMultiple Airlines
Deal found 9/10$643
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Mon 12/159:00 pmICN - ORD
1 stop16h 30mMultiple Airlines
Wed 2/116:50 pmORD - ICN
1 stop19h 30mMultiple Airlines
Deal found 9/10$652
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 10/258:35 pmICN - ORD
1 stop17h 31mMultiple Airlines
Sat 11/18:00 amORD - ICN
1 stop20h 35mMultiple Airlines
Deal found 9/10$667
This WhyPayMore deal was found by Cheapflights users on 9/11. 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.
Sat 10/186:20 pmICN - ORD
1 stop19h 39mMultiple Airlines
Sat 10/256:00 amORD - ICN
1 stop21h 55mMultiple Airlines
Deal found 9/11$674
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Sun 12/149:00 pmICN - ORD
1 stop16h 30mMultiple Airlines
Wed 2/116:50 pmORD - ICN
1 stop19h 30mMultiple Airlines
Deal found 9/10$683
This WhyPayMore deal was found by Cheapflights users on 9/10. 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.
Sat 10/116:20 pmICN - ORD
1 stop26h 04mMultiple Airlines
Sat 10/186:00 amORD - ICN
1 stop21h 55mMultiple Airlines
Deal found 9/10$686
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Mon 12/159:00 pmICN - ORD
1 stop16h 30mMultiple Airlines
Fri 2/136:50 pmORD - ICN
1 stop19h 30mMultiple Airlines
Deal found 9/10$693

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 September 11, 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

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Tue 10/21

7:40 pm-12:24 am

1 stop18h 44m

Lambert-St Louis

Sat 10/25

4:45 pm-3:30 pm

1 stop32h 45m

$637

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Sat 10/18

8:35 pm-6:24 am

1 stop23h 49m

Chicago O'Hare Intl

Sat 10/25

7:00 am-6:35 pm

2 stops21h 35m

$776

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 10/6

8:35 pm-2:50 pm

1 stop32h 15m

Chicago O'Hare Intl

Tue 10/14

7:59 pm-6:35 pm

2 stops32h 36m

$782

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Fri 2/13

6:00 pm-6:04 pm

1 stop39h 04m

Lambert-St Louis

Mon 2/16

6:30 am-3:30 pm

1 stop18h 00m

$794

BusanChicago

PUS - ORD

PUSORD

Busan Gimhae

Sat 10/25

7:00 am-8:50 pm

2 stops27h 50m

Chicago O'Hare Intl

Sat 11/1

10:00 am-8:10 am

2 stops32h 10m

$822

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Sat 10/11

8:35 pm-1:04 pm

2 stops30h 29m

Chicago O'Hare Intl

Sat 10/18

5:59 pm-7:00 pm

2 stops35h 01m

$872

IncheonChicago

ICN - MDW

ICNMDW

Incheon Intl

Mon 10/6

8:55 pm-1:38 pm

2 stops30h 43m

Chicago Midway

Tue 10/14

5:56 pm-4:55 am

1 stop20h 59m

$938

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Sun 10/12

9:25 pm-2:50 pm

2 stops31h 25m

Chicago O'Hare Intl

Wed 10/22

7:59 pm-6:35 pm

2 stops32h 36m

$951

IncheonChicago

ICN - MDW

ICNMDW

Incheon Intl

Fri 10/10

8:45 pm-8:39 am

2 stops25h 54m

Chicago Midway

Sun 10/26

5:56 pm-5:40 am

1 stop21h 44m

$965

IncheonMoline

ICN - MLI

ICNMLI

Incheon Intl

Fri 2/6

12:45 pm-9:16 pm

2 stops23h 31m

Moline Quad-City

Tue 2/10

8:46 am-5:40 am

2 stops29h 54m

$973

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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 $245). Flying from South Korea to Illinois in March is currently the most expensive (average of $321). 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 September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from South Korea to Illinois as you normally would.

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 September 11, 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 September 11, 2025.
Get a feel of what it's like to fly with Korean Air, Japan 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
1,139 reviews

Comfort

8.3

Entertainment

8.2

Overall

8.4

Food

8.1

Crew

8.7

Boarding

8.5

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
1,139 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Entertainment

8.2

Overall

8.4

Food

8.1

Crew

8.7

Boarding

8.5

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!!
Japan Airlines
8.3
Very good
1,559 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Entertainment

8.2

Overall

8.4

Food

8.1

Crew

8.7

Boarding

8.5

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
8.0
Very good
7,960 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Entertainment

8.2

Overall

8.4

Food

8.1

Crew

8.7

Boarding

8.5

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
10,000 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Entertainment

8.2

Overall

8.4

Food

8.1

Crew

8.7

Boarding

8.5

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
10,000 reviews
Korean Air
8.4
Very good
1,139 reviews

Comfort

8.3

Entertainment

8.2

Overall

8.4

Food

8.1

Crew

8.7

Boarding

8.5

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 44m. Fly via Delta, Alaska Airlines, or United Airlines to get the fastest option. South Korea and Illinois are separated by a distance of 6670 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?

    $550 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 EVA Air and Japan Airlines, with prices starting from $653 and $670, 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 $245). Flying from South Korea to Illinois in March is currently the most expensive (average of $321). 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

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$229Average$1,396FlexibilityNo cancel feeOn-timeN/A
Asiana AirlinesCheapest$558Average$1,047FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$730Average$1,053FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$763Average$1,024FlexibilityNo cancel feeOn-time71%
Korean AirCheapest$857Average$1,335FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$959Average$1,590FlexibilityNo cancel feeOn-time69%

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