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Incheon Intl

$380+ Cheap flights from Illinois to Incheon Intl (ICN)

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 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ICN
Feb 22 — Mar 11
Sun 2/22
Sun 3/1
1 adult, Economy
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Cheap flight deals from Illinois to Incheon Intl

Cheapest flights from Illinois to Incheon Intl
Explore the most affordable flight options available from Illinois to Incheon Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2026.

This Expedia deal was found by Cheapflights users on 1/22. 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.
Thu 4/27:00 am
STL
-
ICN
1 stop21h 35m
Multiple Airlines
Wed 4/87:05 pm
ICN
-
STL
1 stop34h 19m
Multiple Airlines
Deal found 1/22$730
This Kiwi.com deal was found by Cheapflights users on 1/22. 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 3/87:00 am
STL
-
ICN
1 stop21h 35m
Multiple Airlines
Sun 3/158:35 pm
ICN
-
STL
1 stop17h 24m
Multiple Airlines
Deal found 1/22$738
This Expedia deal was found by Cheapflights users on 1/21. 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.
Wed 2/187:00 am
STL
-
ICN
1 stop20h 35m
Multiple Airlines
Sun 2/228:35 pm
ICN
-
STL
1 stop18h 24m
Multiple Airlines
Deal found 1/21$747
This Expedia deal was found by Cheapflights users on 1/21. 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.
Sun 2/157:00 am
STL
-
ICN
1 stop20h 35m
Multiple Airlines
Sun 3/158:35 pm
ICN
-
STL
1 stop31h 16m
Multiple Airlines
Deal found 1/21$753
This Orbitz deal was found by Cheapflights users on 1/21. 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.
Sat 2/142:47 pm
STL
-
ICN
1 stop36h 48m
Multiple Airlines
Sat 2/218:35 pm
ICN
-
STL
1 stop32h 48m
Multiple Airlines
Deal found 1/21$760
This Flighttix deal was found by Cheapflights users on 1/22. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/166:22 pm
ORD
-
ICN
2 stops31h 23m
Multiple Airlines
Tue 3/38:10 pm
ICN
-
ORD
2 stops33h 45m
Multiple Airlines
Deal found 1/22$817
This Justfly.com deal was found by Cheapflights users on 1/22. 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.
Mon 3/28:20 pm
ORD
-
ICN
1 stop21h 45m
Turkish Airlines
Tue 3/1012:10 am
ICN
-
ORD
1 stop33h 15m
Turkish Airlines
Deal found 1/22$818
This FlightHub deal was found by Cheapflights users on 1/22. 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.
Tue 1/278:20 pm
ORD
-
ICN
1 stop31h 00m
Turkish Airlines
Wed 2/412:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/22$828
This Expedia deal was found by Cheapflights users on 1/22. 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.
Thu 2/197:00 am
STL
-
ICN
1 stop20h 35m
Multiple Airlines
Thu 2/268:10 pm
ICN
-
STL
1 stop34h 19m
Multiple Airlines
Deal found 1/22$834
This oojo deal was found by Cheapflights users on 1/21. 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 2/118:20 pm
ORD
-
ICN
1 stop21h 45m
Turkish Airlines
Wed 2/1812:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/21$838
This Alaska Airlines deal was found by Cheapflights users on 1/22. 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 4/167:00 am
STL
-
ICN
1 stop21h 35m
Multiple Airlines
Wed 4/227:35 pm
ICN
-
STL
1 stop18h 24m
Multiple Airlines
Deal found 1/22$846
This United Airlines deal was found by Cheapflights users on 1/21. 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 3/56:51 am
STL
-
ICN
1 stop18h 24m
United Airlines
Mon 3/911:45 am
ICN
-
STL
1 stop24h 40m
United Airlines
Deal found 1/21$847

Find flight deals from Illinois to Incheon Intl

Keep the following information in mind while searching for Illinois to Incheon Intl flight deals. Data was last updated January 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$730
(Expedia)

One-way from

$380
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$847

Good round-trip deal

$787 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.
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From Illinois to Incheon Intl
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One-way flight from Illinois to Incheon Intl
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High demand for flights, 5% potential price rise
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($68 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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Price to beat on a round-trip flight from Illinois to Incheon Intl.
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Price to beat on a one-way flight from Illinois to Incheon Intl.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Incheon Intl 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 January 23, 2026.
Use the filters below to find and compare flights from Illinois to Incheon Intl Airport that are best for you.

Fly from

Illinois

Fly to

Incheon Intl

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/16

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Wed 4/22

7:35 pm-11:59 pm

1 stop18h 24m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/25

7:00 am-5:30 pm

1 stop20h 30m

Incheon Intl

Wed 5/6

7:35 pm-11:59 pm

1 stop18h 24m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/25

1:11 pm-4:00 am

1 stop24h 49m

Incheon Intl

Wed 5/6

7:40 pm-11:12 pm

1 stop17h 32m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 3/5

6:51 am-4:15 pm

1 stop18h 24m

Incheon Intl

Wed 5/6

4:50 pm-5:47 am

1 stop26h 57m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 4/25

2:40 pm-4:20 am

2 stops23h 40m

Incheon Intl

Wed 5/6

4:50 pm-5:47 am

1 stop26h 57m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 2/19

6:10 am-4:30 pm

2 stops19h 20m

Incheon Intl

Thu 2/26

8:05 pm-12:25 am

2 stops19h 20m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 5/2

12:15 pm-4:20 am

2 stops26h 05m

Incheon Intl

Wed 5/6

11:30 am-8:43 pm

2 stops23h 13m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/16

7:05 am-4:50 pm

2 stops19h 45m

Incheon Intl

Wed 4/22

7:00 pm-11:12 pm

2 stops18h 12m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/16

8:54 am-4:20 am

2 stops29h 26m

Incheon Intl

Wed 4/22

4:50 pm-10:56 pm

2 stops20h 06m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 3/6

6:40 pm-4:30 pm

2 stops30h 50m

Incheon Intl

Fri 3/13

6:00 pm-11:58 pm

1 stop19h 58m

$851

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 59 results
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Best time to book a flight from Illinois to Incheon Intl

Have a flexible travel schedule? Discover the best time to fly to Incheon Intl 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 Incheon Intl Airport

What is the cheapest month to book a flight from Illinois to Incheon Intl Airport?

Currently, October is the cheapest month in which you can book a flight from Illinois to Incheon Intl Airport (average of $204). Flying from Illinois to Incheon Intl Airport in July is currently the most expensive (average of $1,124). 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 ICN?

Find hourly flight availability from Illinois to Incheon Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 23, 2026.

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

Weekly flight availability from Illinois to Incheon Intl Airport

Explore weekly flight availability from Illinois to Incheon Intl. 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 January 23, 2026.

The most flights from USIL to ICN 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 Incheon Intl. 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 Incheon Intl Airport?

    Airlines like Alaska Airlines, Delta, and Turkish Airlines fly from Illinois to Incheon Intl Airport in about 20h 30m. The time it takes to get you to your destination can typically vary by up to 19h. Airlines will cover 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 Illinois to Incheon Intl Airport one-way?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at $446. American Airlines flights start at $468 while deals on Turkish Airlines start at $491 one-way.

  • What are the most popular routes from Illinois to Incheon Intl Airport?

    The most popular route from Illinois to Incheon Intl Airport is Chicago O'Hare Intl - Incheon Intl. You may also consider Chicago Midway - Incheon Intl or Lambert-St Louis - Incheon Intl.

  • What are the most reliable airlines from Illinois to Incheon Intl Airport?

    Consider Delta (59%), Atlas Air (57%) or Korean Air (52%) when booking your flight. These represent the most reliable airlines when flying from Illinois to Incheon Intl Airport.

  • What are the cheapest flights from Illinois to Incheon Intl Airport?

    Looking for the cheapest flight from Illinois to Incheon Intl Airport? While on average our users pay $2,224, our data indicates the cheapest price to be $374. The most popular route (Chicago O'Hare Intl - Incheon Intl), is priced around $818.

  • Can I find deals for flights from Illinois to Incheon Intl that include hotel bookings?

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

  • How can I find direct flights from Illinois to Incheon Intl?

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

  • Can I find deals for business class flights from Illinois to Incheon Intl?

    Yes. Cheapflights offers flight deals from Illinois to Incheon Intl 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 Incheon Intl Airport?

    Currently, October is the cheapest month in which you can book a flight from Illinois to Incheon Intl Airport (average of $204). Flying from Illinois to Incheon Intl Airport in July is currently the most expensive (average of $1,124). 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

Traveling to a place near Incheon Intl Airport?

Book flights to Incheon Intl Airport if you plan to visit one of these locations
Suwon
Seongnam

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Alternative routes for Illinois to Incheon Intl

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 Incheon Intl

Discover the top 9 airlines that operate flights from Illinois to Incheon Intl. 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 January 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,887FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,995FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$918FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$869Average$1,108FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$915Average$1,690FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,003Average$1,252FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,095Average$1,320FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,110Average$1,375FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,557Average$1,899FlexibilityNo cancel feeOn-time81%

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