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$335+ Cheap flights from Illinois to South Korea

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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ICN
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
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Cheap flight deals from Illinois to South Korea

Cheapest flights from Illinois to South Korea
Explore the most affordable flight options available from Illinois to South Korea. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

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.
Tue 12/306:35 pmSTL - ICN
2 stops30h 40mUnited Airlines
Thu 1/156:00 pmICN - STL
1 stop26h 11mUnited Airlines
Deal found 12/13$850
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:35 pmORD - ICN
1 stop39h 50mCathay Pacific
Thu 3/57:35 pmICN - ORD
1 stop32h 20mCathay Pacific
Deal found 12/15$1,056
This Cathay Pacific 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:35 pmORD - ICN
1 stop32h 20mCathay Pacific
Wed 3/43:00 pmICN - ORD
1 stop36h 55mCathay Pacific
Deal found 12/15$1,235
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/301:10 pmORD - ICN
1 stop30h 35mMultiple Airlines
Wed 3/46:55 pmICN - ORD
2 stops30h 56mMultiple Airlines
Deal found 12/15$1,239
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/271:10 pmORD - ICN
1 stop30h 35mMultiple Airlines
Wed 1/286:55 pmICN - ORD
2 stops37h 15mMultiple Airlines
Deal found 12/14$1,286
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 12/246:00 amSTL - ICN
2 stops32h 40mUnited Airlines
Sun 1/116:00 pmICN - STL
2 stops34h 16mUnited Airlines
Deal found 12/14$1,286
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:44 pmORD - ICN
1 stop29h 36mMultiple Airlines
Thu 1/229:20 pmICN - ORD
2 stops39h 25mMultiple Airlines
Deal found 12/14$1,366
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:44 pmORD - ICN
1 stop29h 36mMultiple Airlines
Fri 1/236:55 pmICN - ORD
2 stops36h 56mMultiple Airlines
Deal found 12/14$1,380
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/271:10 pmORD - ICN
1 stop30h 35mMultiple Airlines
Tue 1/276:55 pmICN - ORD
3 stops33h 18mMultiple Airlines
Deal found 12/14$1,404
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.
Sat 12/276:35 pmSTL - ICN
2 stops30h 40mUnited Airlines
Tue 12/3012:45 pmICN - STL
2 stops24h 44mUnited Airlines
Deal found 12/15$1,412
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.
Sat 12/275:45 pmSTL - ICN
2 stops31h 30mUnited Airlines
Thu 1/156:00 pmICN - STL
2 stops30h 22mUnited Airlines
Deal found 12/13$1,429
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/277:02 pmSTL - ICN
1 stop31h 43mDelta
Thu 1/158:05 pmICN - STL
2 stops18h 20mDelta
Deal found 12/13$1,431

Find flight deals from Illinois to South Korea

Keep the following information in mind while searching for Illinois to South Korea flight deals. Data was last updated December 16, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$746
(Delta)

One-way from

$335
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$2,072

Good round-trip deal

$793 or less

Good one-way deal

$583 or less
Provider with most accurate pricing for Chicago (CHI)-Seoul (SEL) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Seoul (SEL) flights.
Search Deals
From Illinois to South Korea
Search Deals
One-way flight from Illinois to South Korea
Search Deals
High demand for flights, 5% potential price rise
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($66 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 Illinois to South Korea.
Search Deals
Price to beat on a one-way flight from Illinois to South Korea.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to South Korea 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 16, 2025.
Use the filters below to find and compare flights from Illinois to South Korea that are best for you.

Fly from

Illinois

Fly to

South Korea

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 1/27

6:00 am-3:50 pm

1 stop18h 50m

Incheon Intl

Tue 2/3

7:40 pm-9:38 pm

1 stop16h 58m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 1/31

6:19 pm-6:35 pm

1 stop33h 16m

Incheon Intl

Mon 2/9

8:35 pm-1:54 pm

1 stop32h 19m

$758

ChicagoJeju City

ORD - CJU

ORDCJU

Chicago O'Hare Intl

Wed 1/28

2:35 pm-6:40 am

1 stop25h 05m

Jeju City

Wed 2/4

7:55 am-12:55 pm

1 stop20h 00m

$843

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/15

5:25 pm-5:40 am

1 stop21h 15m

Incheon Intl

Thu 2/19

12:45 pm-4:44 pm

1 stop18h 59m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 12/30

6:35 pm-4:15 pm

2 stops30h 40m

Incheon Intl

Thu 1/15

6:00 pm-5:11 am

1 stop26h 11m

$850

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sat 1/31

7:04 am-10:55 am

2 stops36h 51m

Seoul Gimpo Intl

Mon 2/9

8:00 am-11:59 pm

2 stops30h 59m

$866

ChicagoJeju City

ORD - CJU

ORDCJU

Chicago O'Hare Intl

Tue 1/27

2:35 pm-6:40 am

1 stop25h 05m

Jeju City

Tue 2/3

7:55 am-12:55 pm

1 stop20h 00m

$866

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 1/21

6:00 am-10:05 pm

2 stops49h 05m

Seoul Gimpo Intl

Sun 1/25

7:40 pm-11:59 pm

2 stops43h 19m

$890

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 1/28

7:04 am-10:05 pm

2 stops24h 01m

Seoul Gimpo Intl

Wed 2/4

8:00 am-11:59 pm

2 stops30h 59m

$900

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Sun 1/18

3:45 pm-5:40 am

2 stops22h 55m

Incheon Intl

Thu 1/22

6:00 pm-10:12 am

2 stops31h 12m

$920

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

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

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

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

Currently, October is the cheapest month in which you can book a flight from Illinois to South Korea (average of $201). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,222). 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 KR?

Find hourly flight availability from Illinois to South Korea. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 16, 2025.

It’s typically best to fly out from Illinois to South Korea at noon. Doing so could potentially save you 65% on the flight price compared to flying in the morning, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from Illinois to South Korea. Price data was last updated on March 30, 2025.

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

Weekly flight availability from Illinois to South Korea

Explore weekly flight availability from Illinois to South Korea. 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 16, 2025.

The most flights from USIL to KR0 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).

Related info for your journey

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

    Airlines like Delta, Cathay Pacific, and United Airlines fly from Illinois to South Korea in about 18h 50m. The time it takes to get you to your destination can typically vary by up to 6h 15m. The distance from Illinois to South Korea is about 6670 mi. This flight may include one or multiple stops.

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

    $68 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Southwest and American Airlines, with prices starting from $89 and $89, respectively.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Illinois to South Korea (average of $201). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,222). 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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Top 9 airlines flying from Illinois to South Korea

Discover the top 9 airlines that operate flights from Illinois to South Korea. 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 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,881FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,476FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$899FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$849Average$1,076FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$926Average$1,475FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,003Average$1,310FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,095Average$1,336FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,110Average$1,375FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,503Average$1,838FlexibilityNo cancel feeOn-time81%

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