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Incheon Intl

$335+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ICN
ene. 3 — ene. 101
sáb. 1/3
sáb. 1/10
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 diciembre 4, 2025.

This United Airlines deal was found by Cheapflights users on 12/2. 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.
jue. 12/45:30 pmSTL - ICN
1 stop31h 45mUnited Airlines
mar. 1/1312:45 pmICN - STL
2 stops23h 13mUnited Airlines
Deal found 12/2$857
This American Airlines deal was found by Cheapflights users on 12/1. 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.
mié. 12/35:09 amMLI - ICN
1 stop20h 36mAmerican Airlines
dom. 12/77:15 pmICN - MLI
1 stop18h 28mAmerican Airlines
Deal found 12/1$916
This United Airlines deal was found by Cheapflights users on 12/2. 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.
mié. 12/38:48 amMLI - ICN
2 stops29h 52mUnited Airlines
dom. 12/712:45 pmICN - MLI
2 stops23h 26mUnited Airlines
Deal found 12/2$920
This Cathay Pacific deal was found by Cheapflights users on 12/3. 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.
mié. 12/32:35 pmORD - ICN
1 stop37h 00mCathay Pacific
lun. 12/810:00 amICN - ORD
1 stop41h 55mCathay Pacific
Deal found 12/3$1,010
This oojo deal was found by Cheapflights users on 12/3. 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.
mié. 12/32:35 pmORD - ICN
1 stop37h 00mCathay Pacific
jue. 12/113:00 pmICN - ORD
1 stop36h 55mCathay Pacific
Deal found 12/3$1,036
This oojo deal was found by Cheapflights users on 12/4. 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.
mar. 12/92:35 pmORD - ICN
1 stop32h 20mCathay Pacific
mar. 12/161:45 pmICN - ORD
1 stop38h 10mCathay Pacific
Deal found 12/4$1,061
This Gotogate deal was found by Cheapflights users on 12/3. 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.
sáb. 12/62:35 pmORD - ICN
1 stop37h 00mCathay Pacific
sáb. 12/131:45 pmICN - ORD
1 stop38h 10mCathay Pacific
Deal found 12/3$1,086
This Delta deal was found by Cheapflights users on 12/3. 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.
sáb. 12/66:00 amSTL - ICN
2 stops19h 30mDelta
sáb. 12/139:35 amICN - STL
2 stops21h 33mDelta
Deal found 12/3$1,102
This oojo deal was found by Cheapflights users on 12/3. 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.
lun. 12/82:35 pmORD - ICN
1 stop32h 20mCathay Pacific
sáb. 12/201:45 pmICN - ORD
1 stop38h 10mCathay Pacific
Deal found 12/3$1,111
This oojo deal was found by Cheapflights users on 12/2. 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.
dom. 12/72:35 pmORD - ICN
1 stop37h 00mCathay Pacific
dom. 12/1410:00 amICN - ORD
1 stop41h 55mCathay Pacific
Deal found 12/2$1,112
This oojo deal was found by Cheapflights users on 12/4. 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.
mar. 12/92:35 pmORD - ICN
1 stop31h 10mCathay Pacific
dom. 12/1410:00 amICN - ORD
1 stop41h 55mCathay Pacific
Deal found 12/4$1,136
This Kiwi.com deal was found by Cheapflights users on 12/3. 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.
dom. 12/76:50 amORD - ICN
1 stop31h 20mMultiple Airlines
mar. 12/91:20 pmICN - ORD
1 stop31h 45mMultiple Airlines
Deal found 12/3$1,149

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 diciembre 4, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$846
(United Airlines)

One-way from

$335
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$1,659

Good round-trip deal

$793 or less

Good one-way deal

$552 or less
Provider with most accurate pricing for Chicago (CHI)-Seoul (SEL) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Seoul (SEL) flights.
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From Illinois to Incheon Intl
Search Deals
One-way flight from Illinois to Incheon Intl
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Highest demand for flights based on searches. 11% potential increase in price ($173 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 diciembre 4, 2025.
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

dom. 2/15

6:10 am-3:30 pm

1 stop18h 20m

Incheon Intl

jue. 2/19

7:30 pm-11:23 pm

1 stop18h 53m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

dom. 2/15

3:15 pm-5:40 am

2 stops23h 25m

Incheon Intl

mié. 3/4

12:45 pm-4:44 pm

1 stop18h 59m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

mié. 1/14

6:00 am-3:50 pm

1 stop18h 50m

Incheon Intl

mié. 1/28

9:35 am-8:43 pm

1 stop26h 08m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

dom. 2/15

5:25 pm-5:40 am

1 stop21h 15m

Incheon Intl

jue. 2/19

12:45 pm-4:44 pm

1 stop18h 59m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

vie. 2/13

6:10 am-3:30 pm

1 stop18h 20m

Incheon Intl

dom. 2/22

6:00 pm-11:36 pm

1 stop20h 36m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

mié. 1/21

5:04 pm-5:45 am

1 stop21h 41m

Incheon Intl

mar. 1/27

9:35 am-8:43 pm

1 stop26h 08m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

dom. 1/18

12:00 pm-5:45 am

1 stop26h 45m

Incheon Intl

vie. 1/23

9:35 am-4:37 pm

1 stop22h 02m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 2/14

6:35 am-4:50 pm

1 stop19h 15m

Incheon Intl

dom. 3/1

7:25 pm-11:36 pm

1 stop19h 11m

$846

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

mié. 1/14

3:11 pm-5:40 am

2 stops23h 29m

Incheon Intl

mié. 1/28

12:45 pm-8:58 pm

2 stops23h 13m

$850

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

lun. 2/23

2:35 pm-9:25 pm

1 stop39h 50m

Incheon Intl

dom. 3/8

10:00 am-12:55 pm

1 stop41h 55m

$881

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/4

Showing 1-10 of 60 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 $203). Flying from Illinois to Incheon Intl Airport in June is currently the most expensive (average of $1,239). 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 diciembre 4, 2025.

When flying from Illinois to Incheon Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 44% versus a flight in the afternoon.

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 diciembre 4, 2025.

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 Delta, United Airlines, and Cathay Pacific fly from Illinois to Incheon Intl Airport in about 18h 20m. The time it takes to get you to your destination can typically vary by up to 21h 30m. 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. Turkish Airlines flights start at $491 while deals on American Airlines start at $504 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 (64%), Korean Air (57%) or Atlas Air (29%) 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 $2,244, our data indicates the cheapest price to be $480. The most popular route (Chicago O'Hare Intl - Incheon Intl), is priced around $833.

  • 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 $203). Flying from Illinois to Incheon Intl Airport in June is currently the most expensive (average of $1,239). 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 diciembre 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,881FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,704FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$893FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$848Average$1,045FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$926Average$1,448FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,015Average$1,295FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,095Average$1,336FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,110Average$1,374FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,508Average$1,889FlexibilityNo cancel feeOn-time81%

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