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$420+ Cheap flights from Incheon Intl (ICN) to Illinois

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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
ICN — ORD
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheap flight deals from Incheon Intl to Illinois

Keep the following information in mind while searching for Incheon Intl to Illinois flight deals. Data was last updated July 3, 2025.

Round-trip from

$732
(Delta)

One-way from

$432
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$1,507

Good round-trip deal

$1,361 or less
From Incheon Intl to Illinois
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One-way flight from Incheon Intl to Illinois
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Highest demand for flights based on searches. 20% potential increase in price ($309 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Incheon Intl to Illinois.
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Find flight deals from Incheon Intl to Illinois

Cheapest flights from Incheon Intl to Illinois
Explore the most affordable flight options available from Incheon Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This Delta deal was found by Cheapflights users on 7/3. 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.
Mon 9/156:40 pmICN - STL
1 stop30h 50mDelta
Tue 10/146:45 amSTL - ICN
1 stop19h 40mDelta
Deal found 7/3$732
This United Airlines deal was found by Cheapflights users on 7/2. 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.
Mon 11/1012:45 pmICN - STL
1 stop19h 18mUnited Airlines
Sat 11/1511:10 amSTL - ICN
2 stops27h 30mUnited Airlines
Deal found 7/2$751
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2912:45 pmICN - ORD
1 stop19h 29mMultiple Airlines
Sun 8/317:05 amORD - ICN
1 stop18h 40mMultiple Airlines
Deal found 7/3$782
This Korean Air deal was found by Cheapflights users on 7/3. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/256:40 pmICN - STL
1 stop18h 29mKorean Air
Tue 10/148:50 amSTL - ICN
1 stop18h 30mKorean Air
Deal found 7/3$791
This Air Canada deal was found by Cheapflights users on 6/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/165:45 pmICN - ORD
1 stop16h 19mAir Canada
Thu 9/257:41 pmORD - ICN
1 stop30h 24mAir Canada
Deal found 6/30$799
This Asiana Airlines deal was found by Cheapflights users on 7/2. 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 Asiana Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/168:55 pmICN - STL
1 stop21h 59mMultiple Airlines
Thu 7/175:41 pmSTL - ICN
1 stop20h 19mMultiple Airlines
Deal found 7/2$871
This Gotogate deal was found by Cheapflights users on 7/1. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/98:55 pmICN - STL
1 stop21h 59mAsiana Airlines
Tue 8/195:49 pmSTL - ICN
1 stop20h 11mAsiana Airlines
Deal found 7/1$872
This Air Canada deal was found by Cheapflights users on 7/1. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/156:55 pmICN - STL
2 stops35h 34mAir Canada
Wed 11/194:05 pmSTL - ICN
2 stops34h 05mAir Canada
Deal found 7/1$889
This American Airlines deal was found by Cheapflights users on 7/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/195:25 pmICN - STL
1 stop16h 57mAmerican Airlines
Sun 11/165:57 pmSTL - ICN
1 stop31h 48mAmerican Airlines
Deal found 7/2$939
This Kiwi.com deal was found by Cheapflights users on 7/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/159:30 amICN - MDW
1 stop17h 41mMultiple Airlines
Fri 9/197:15 amMDW - ICN
1 stop19h 25mMultiple Airlines
Deal found 7/1$1,018
This Delta deal was found by Cheapflights users on 7/3. 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.
Mon 10/136:40 pmICN - MDW
1 stop32h 29mDelta
Sat 10/256:45 pmMDW - ICN
1 stop30h 45mDelta
Deal found 7/3$1,200
This WestJet deal was found by Cheapflights users on 7/2. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/118:45 pmICN - MDW
2 stops27h 06mWestJet
Fri 10/176:45 pmMDW - ICN
2 stops58h 00mWestJet
Deal found 7/2$1,316

Cheapflights Fare Finder

Customize your flight search to find flights from Incheon Intl to Illinois 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 July 3, 2025.
Use the filters below to find and compare flights from Incheon Intl Airport to Illinois that are best for you.

Fly from

Incheon Intl

Fly to

Illinois

Route

Depart

Return

Price

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 9/15

6:40 pm-11:30 am

1 stop30h 50m

Lambert-St Louis

Tue 10/14

6:45 am-4:25 pm

1 stop19h 40m

$732

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Mon 11/10

12:45 pm-5:03 pm

1 stop19h 18m

Lambert-St Louis

Sat 11/15

11:10 am-5:40 am

2 stops27h 30m

$751

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Fri 8/29

12:45 pm-6:14 pm

1 stop19h 29m

Chicago O'Hare Intl

Sun 8/31

7:05 am-3:45 pm

1 stop18h 40m

$782

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 9/25

6:40 pm-11:09 pm

1 stop18h 29m

Lambert-St Louis

Tue 10/14

8:50 am-5:20 pm

1 stop18h 30m

$791

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 9/16

5:45 pm-8:04 pm

1 stop16h 19m

Chicago O'Hare Intl

Thu 9/25

7:41 pm-4:05 pm

1 stop30h 24m

$799

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Wed 7/16

8:55 pm-4:54 am

1 stop21h 59m

Lambert-St Louis

Thu 7/17

5:41 pm-4:00 am

1 stop20h 19m

$871

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Sat 11/15

6:55 pm-3:29 pm

2 stops35h 34m

Lambert-St Louis

Wed 11/19

4:05 pm-5:10 pm

2 stops34h 05m

$889

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Tue 8/19

5:25 pm-8:22 pm

1 stop16h 57m

Lambert-St Louis

Sun 11/16

5:57 pm-4:45 pm

1 stop31h 48m

$939

IncheonChicago

ICN - MDW

ICNMDW

Incheon Intl

Mon 9/15

9:30 am-1:11 pm

1 stop17h 41m

Chicago Midway

Fri 9/19

7:15 am-4:40 pm

1 stop19h 25m

$1,018

IncheonChicago

ICN - MDW

ICNMDW

Incheon Intl

Mon 10/13

6:40 pm-1:09 pm

1 stop32h 29m

Chicago Midway

Sat 10/25

6:45 pm-3:30 pm

1 stop30h 45m

$1,200

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 23 results
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Best time to book a flight from Incheon Intl to Illinois

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

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

Currently, August is the cheapest month in which you can book a flight from Incheon Intl Airport to Illinois (average of $245). Flying from Incheon Intl Airport to Illinois in March is currently the most expensive (average of $321). 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 ICN to IL?

Find hourly flight availability from Incheon Intl to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

When flying from Incheon Intl Airport to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Incheon Intl Airport to Illinois

Explore weekly flight availability from Incheon Intl to Illinois. 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 July 3, 2025.

The most flights from ICN to USIL 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).

How much does it cost to fly round-trip from Incheon Intl Airport to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated July 3, 2025.
See what other customers who have flown with Korean Air, Alaska Airlines, and Delta from Incheon Intl Airport to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,101 reviews

Entertainment

8.2

Overall

8.4

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Korean Air
8.4
Very good
1,101 reviews
Korean Air
8.4
Very good
1,101 reviews

Entertainment

8.2

Overall

8.4

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Alaska Airlines
8.0
Very good
10,000 reviews
Korean Air
8.4
Very good
1,101 reviews

Entertainment

8.2

Overall

8.4

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Delta
8.0
Very good
7,970 reviews
Korean Air
8.4
Very good
1,101 reviews

Entertainment

8.2

Overall

8.4

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
Qatar Airways
7.4
Good
3,588 reviews
Korean Air
8.4
Very good
1,101 reviews

Entertainment

8.2

Overall

8.4

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.
United Airlines
7.4
Good
8,845 reviews
Korean Air
8.4
Very good
1,101 reviews

Entertainment

8.2

Overall

8.4

Comfort

8.3

Crew

8.7

Boarding

8.5

Food

8.1

Reviews

1 / 20
10.0
Excellent

Myung Suk,May 2025

ICN - LAX

The flight was less crowded and the economic class seat was at least 5 inches longer than other airlines.

Related info for your journey

Find useful and relevant information for your journey from Incheon Intl to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Incheon Intl Airport to Illinois one-way?

    The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as $617. However, be on the lookout for offers from Alaska Airlines and WestJet, as they are both options that can get you from Incheon Intl Airport to Illinois for a low price.

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

    While some choose either Incheon Intl - Chicago Midway or Incheon Intl - Lambert-St Louis, Incheon Intl - Chicago O'Hare Intl is the most popular route from Incheon Intl Airport to Illinois.

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

    The cheapest flight price from Incheon Intl Airport to Illinois is $1,257. On average you can expect to pay $1,734. The most popular route, (Incheon Intl - Chicago O'Hare Intl), can usually be booked for $774.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Incheon Intl Airport to Illinois (average of $245). Flying from Incheon Intl Airport to Illinois in March is currently the most expensive (average of $321). 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.

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Alternative routes for Incheon Intl to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Incheon Intl to Illinois

Discover the top 6 airlines that operate flights from Incheon Intl to Illinois. 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$229Average$1,409FlexibilityNo cancel feeOn-timeN/A
Asiana AirlinesCheapest$558Average$1,137FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$697Average$947FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$730Average$1,053FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$851Average$1,590FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$857Average$1,332FlexibilityNo cancel feeOn-time81%

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