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$374+ 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 3/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ICN
fev 27 — mar 61
sex 2/27
sex 3/6
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 janeiro 28, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 3/57:00 am
STL
-
ICN
1 stop20h 35m
Multiple Airlines
dom 3/158:35 pm
ICN
-
STL
1 stop17h 24m
Multiple Airlines
Deal found 1/27$753
This Expedia deal was found by Cheapflights users on 1/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 1/292:50 pm
STL
-
ICN
1 stop36h 45m
Multiple Airlines
sáb 1/318:35 pm
ICN
-
STL
1 stop32h 19m
Multiple Airlines
Deal found 1/26$780
This Justfly.com deal was found by Cheapflights users on 1/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 3/28:20 pm
ORD
-
ICN
1 stop21h 45m
Turkish Airlines
qua 3/1110:45 am
ICN
-
ORD
1 stop46h 40m
Turkish Airlines
Deal found 1/26$818
This Justfly.com deal was found by Cheapflights users on 1/28. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 3/311:50 am
ORD
-
ICN
1 stop39h 30m
Turkish Airlines
seg 3/912:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/28$819
This Justfly.com deal was found by Cheapflights users on 1/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 4/208:10 pm
ORD
-
ICN
1 stop22h 25m
Turkish Airlines
sex 5/810:15 am
ICN
-
ORD
1 stop46h 00m
Turkish Airlines
Deal found 1/27$828
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom 2/111:50 am
ORD
-
ICN
1 stop39h 30m
Turkish Airlines
qua 2/412:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/27$829
This oojo deal was found by Cheapflights users on 1/26. 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.
ter 3/38:20 pm
ORD
-
ICN
1 stop31h 00m
Turkish Airlines
seg 3/1612:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/26$838
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb 9/56:41 am
STL
-
ICN
1 stop20h 49m
Alaska Airlines
seg 9/147:35 pm
ICN
-
STL
1 stop18h 24m
Alaska Airlines
Deal found 1/27$847
This United Airlines deal was found by Cheapflights users on 1/27. 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.
sáb 5/24:15 pm
STL
-
ICN
2 stops22h 05m
United Airlines
ter 5/124:50 pm
ICN
-
STL
2 stops20h 09m
United Airlines
Deal found 1/27$851
This Justfly.com deal was found by Cheapflights users on 1/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom 4/198:10 pm
ORD
-
ICN
1 stop31h 30m
Turkish Airlines
ter 5/1211:20 pm
ICN
-
ORD
1 stop24h 20m
Turkish Airlines
Deal found 1/26$854
This United Airlines deal was found by Cheapflights users on 1/27. 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.
sáb 5/28:30 am
STL
-
ICN
1 stop40h 30m
United Airlines
qui 5/144:50 pm
ICN
-
STL
1 stop26h 57m
United Airlines
Deal found 1/27$854
This Justfly.com deal was found by Cheapflights users on 1/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 2/28:20 pm
ORD
-
ICN
1 stop21h 45m
Turkish Airlines
dom 2/812:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/26$855

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 janeiro 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$753
(Kiwi.com)

One-way from

$374
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$847

Good round-trip deal

$791 or less

Good one-way deal

$402 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, 3% potential price rise
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($70 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 janeiro 28, 2026.
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

sáb 4/25

9:31 am-4:00 am

1 stop28h 29m

Incheon Intl

qua 5/6

6:50 pm-8:07 am

1 stop27h 17m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

qui 4/16

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

qua 4/22

7:35 pm-11:59 pm

1 stop18h 24m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

qui 4/16

6:48 am-4:25 pm

1 stop19h 37m

Incheon Intl

qua 4/22

4:25 pm-11:34 pm

1 stop21h 09m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb 4/25

7:05 pm-4:20 am

1 stop19h 15m

Incheon Intl

qua 5/6

11:30 am-10:30 pm

2 stops25h 00m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

ter 5/5

4:06 pm-4:20 am

2 stops22h 14m

Incheon Intl

qui 5/14

4:50 pm-5:47 am

1 stop26h 57m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb 5/2

4:15 pm-4:20 am

2 stops22h 05m

Incheon Intl

qui 5/14

4:50 pm-5:47 am

1 stop26h 57m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

qui 4/16

8:54 am-4:20 am

2 stops29h 26m

Incheon Intl

qua 4/22

11:30 am-8:54 pm

2 stops23h 24m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

seg 5/4

5:59 pm-4:20 am

2 stops20h 21m

Incheon Intl

ter 5/12

4:50 pm-10:59 pm

2 stops20h 09m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

seg 2/16

9:55 am-5:40 am

2 stops28h 45m

Incheon Intl

sex 2/20

6:00 pm-8:26 pm

2 stops17h 26m

$851

ChampaignIncheon

CMI - ICN

CMIICN

Champaign University-Willard

seg 3/2

2:54 pm-4:45 pm

1 stop34h 51m

Incheon Intl

qua 3/11

5:55 pm-8:54 pm

1 stop16h 59m

$918

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

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 $204). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,122). 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 janeiro 28, 2026.

It’s typically best to fly out from Illinois to South Korea at noon. Doing so could potentially save you 46% 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 janeiro 28, 2026.

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, United Airlines, and American Airlines fly from Illinois to South Korea in about 19h 15m. The time it takes to get you to your destination can typically vary by up to 15h 36m. 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?

    $446 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on American Airlines and Turkish Airlines, with prices starting from $468 and $491, 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 $204). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,122). 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 Illinois to South Korea

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 janeiro 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,885FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,995FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$918FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$870Average$1,120FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$915Average$1,690FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,003Average$1,258FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,095Average$1,322FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,259Average$1,411FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,557Average$1,840FlexibilityNo cancel feeOn-time81%

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