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$386+ 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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ICN
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Find 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 October 30, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/276:06 pmORD - ICN
1 stop31h 14mMultiple Airlines
Thu 12/49:20 pmICN - ORD
2 stops29h 22mMultiple Airlines
Deal found 10/30$767
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/244:05 pmSTL - ICN
2 stops34h 05mAir Canada
Sat 12/68:10 pmICN - STL
1 stop34h 19mAir Canada
Deal found 10/29$787
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.
Mon 11/1012:31 pmSTL - ICN
2 stops26h 09mUnited Airlines
Thu 11/276:00 pmICN - STL
2 stops33h 28mUnited Airlines
Deal found 10/28$796
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/295:29 pmSTL - ICN
1 stop21h 11mUnited Airlines
Tue 11/412:45 pmICN - STL
1 stop18h 42mUnited Airlines
Deal found 10/27$800
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 11/107:00 amSTL - ICN
1 stop18h 45mAmerican Airlines
Thu 11/277:15 pmICN - STL
1 stop30h 24mAmerican Airlines
Deal found 10/28$842
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2911:50 amORD - ICN
1 stop30h 15mTurkish Airlines
Sat 12/610:45 amICN - ORD
1 stop38h 20mTurkish Airlines
Deal found 10/30$844
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.
Thu 10/308:53 amSTL - ICN
1 stop16h 37mDelta
Sat 11/17:30 pmICN - STL
1 stop17h 37mDelta
Deal found 10/28$846
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/131:36 pmORD - ICN
2 stops48h 34mMultiple Airlines
Mon 12/81:20 pmICN - ORD
1 stop25h 53mMultiple Airlines
Deal found 10/29$849
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:00 amSTL - ICN
1 stop19h 50mDelta
Tue 11/48:05 pmICN - STL
2 stops19h 19mDelta
Deal found 10/29$850
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/52:35 pmORD - ICN
1 stop31h 10mCathay Pacific
Sun 11/97:35 pmICN - ORD
1 stop32h 20mCathay Pacific
Deal found 10/30$857
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/286:15 pmSTL - ICN
2 stops31h 15mDelta
Fri 12/59:35 amICN - STL
2 stops23h 21mDelta
Deal found 10/29$871
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/262:35 pmORD - ICN
1 stop31h 10mCathay Pacific
Sun 12/71:45 pmICN - ORD
1 stop38h 10mCathay Pacific
Deal found 10/29$876

Cheap 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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$787
(Orbitz)

One-way from

$386
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$1,213

Good round-trip deal

$766 or less

Good one-way deal

$580 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
Highest demand for flights based on searches. 12% potential increase in price ($191 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($32 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 Illinois to South Korea.
Search Deals
Price to beat on a one-way flight from Illinois to South Korea.
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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 October 30, 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

Mon 11/24

4:05 pm-5:10 pm

2 stops34h 05m

Incheon Intl

Sat 12/6

8:10 pm-3:29 pm

1 stop34h 19m

$787

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

5:29 pm-5:40 am

1 stop21h 11m

Incheon Intl

Thu 11/27

12:45 pm-5:39 pm

2 stops43h 54m

$796

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

7:00 am-4:45 pm

1 stop18h 45m

Incheon Intl

Thu 11/27

7:15 pm-10:39 am

1 stop30h 24m

$842

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/24

6:40 am-4:50 pm

1 stop19h 10m

Incheon Intl

Sat 12/6

9:35 am-1:53 pm

1 stop19h 18m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

7:47 pm-4:30 pm

2 stops29h 43m

Incheon Intl

Thu 11/27

7:25 pm-9:58 pm

1 stop17h 33m

$850

ChicagoBusan

ORD - PUS

ORDPUS

Chicago O'Hare Intl

Wed 3/4

2:35 pm-1:05 pm

1 stop31h 30m

Busan Gimhae

Wed 5/13

7:45 am-2:25 pm

1 stop20h 40m

$862

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 11/28

5:17 am-4:45 pm

1 stop20h 28m

Incheon Intl

Fri 12/5

7:15 pm-10:47 pm

1 stop18h 32m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 11/28

6:15 pm-4:30 pm

2 stops31h 15m

Incheon Intl

Fri 12/5

9:35 am-5:56 pm

2 stops23h 21m

$871

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Mon 2/9

6:00 am-10:05 pm

2 stops49h 05m

Seoul Gimpo Intl

Fri 2/20

8:00 am-11:48 pm

2 stops30h 48m

$901

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Mon 1/19

8:20 pm-9:05 am

1 stop21h 45m

Incheon Intl

Sat 1/24

10:45 am-10:05 am

1 stop38h 20m

$910

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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 $211). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,248). 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 October 30, 2025.

It’s typically best to fly out from Illinois to South Korea in the evening. Doing so could potentially save you 68% 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.

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 Air Canada, United Airlines, and American Airlines fly from Illinois to South Korea in about 18h 45m. The time it takes to get you to your destination can typically vary by up to 15h 20m. 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?

    $468 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 United Airlines, with prices starting from $619 and $726, 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 $211). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,248). 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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See prices for flight routes from nearby airports that may be better suited for you.
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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$196Average$1,887FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,476FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$891FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$848Average$1,079FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$927Average$1,348FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,015Average$1,296FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,053Average$1,332FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,110Average$1,375FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,505Average$1,886FlexibilityNo cancel feeOn-time81%

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