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$312+ 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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ICN
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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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 July 31, 2025.

Round-trip from

$760
(Gurufare)

One-way from

$312
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$1,674

Good round-trip deal

$834 or less

Good one-way deal

$458 or less
From Illinois to South Korea
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One-way flight from Illinois to South Korea
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Highest demand for flights based on searches. 2% potential increase in price ($38 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($54 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 Illinois to South Korea.
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Price to beat on a one-way flight from Illinois to South Korea.
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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 July 31, 2025.

This Gurufare deal was found by Cheapflights users on 7/29. 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.
Mon 8/254:00 pmORD - ICN
1 stop32h 05mCathay Pacific
Sun 9/218:05 pmICN - ORD
1 stop32h 20mCathay Pacific
Deal found 7/29$760
This American Airlines deal was found by Cheapflights users on 7/31. 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 9/17:01 amSTL - ICN
1 stop18h 29mAmerican Airlines
Sat 9/205:25 pmICN - STL
1 stop19h 02mAmerican Airlines
Deal found 7/31$851
This United Airlines deal was found by Cheapflights users on 7/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/105:29 pmSTL - ICN
1 stop21h 11mUnited Airlines
Thu 11/276:00 pmICN - STL
1 stop37h 27mUnited Airlines
Deal found 7/30$855
This Delta deal was found by Cheapflights users on 7/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/231:30 pmSTL - ICN
1 stop25h 15mDelta
Tue 12/27:30 pmICN - STL
1 stop18h 32mDelta
Deal found 7/30$866
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Sat 9/131:40 pmORD - ICN
2 stops39h 05mMultiple Airlines
Sat 9/2012:45 pmICN - ORD
1 stop19h 29mMultiple Airlines
Deal found 7/30$866
This FlightHub deal was found by Cheapflights users on 7/30. 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.
Wed 8/66:45 amSTL - GMP
2 stops25h 05mJapan Airlines
Mon 8/187:55 amGMP - STL
2 stops29h 14mJapan Airlines
Deal found 7/30$914
This Gurufare deal was found by Cheapflights users on 7/30. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/44:00 pmORD - PUS
1 stop25h 00mCathay Pacific
Mon 9/87:45 amPUS - ORD
1 stop20h 40mCathay Pacific
Deal found 7/30$962
This Kiwi.com deal was found by Cheapflights users on 7/30. 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.
Wed 8/275:45 pmORD - PUS
1 stop32h 50mMultiple Airlines
Wed 9/38:30 amPUS - ORD
2 stops41h 29mMultiple Airlines
Deal found 7/30$1,008
This Air Canada deal was found by Cheapflights users on 7/30. 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.
Thu 9/181:30 pmSTL - ICN
2 stops36h 35mAir Canada
Wed 9/246:00 pmICN - STL
2 stops35h 18mAir Canada
Deal found 7/30$1,029
This Delta deal was found by Cheapflights users on 7/31. 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 9/44:59 pmMLI - ICN
1 stop21h 01mDelta
Sat 9/206:50 pmICN - MLI
1 stop17h 52mDelta
Deal found 7/31$1,072
This oojo deal was found by Cheapflights users on 7/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/112:30 amORD - GMP
1 stop28h 45mEVA Air
Tue 10/147:15 pmGMP - ORD
1 stop39h 30mEVA Air
Deal found 7/28$1,084
This Gotogate deal was found by Cheapflights users on 7/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/134:00 pmORD - CJU
1 stop24h 20mCathay Pacific
Sat 9/207:55 amCJU - ORD
1 stop20h 30mCathay Pacific
Deal found 7/30$1,115

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 July 31, 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

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Mon 8/25

4:00 pm-2:05 pm

1 stop32h 05m

Incheon Intl

Sun 9/21

8:05 pm-2:25 pm

1 stop32h 20m

$760

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 9/1

7:01 am-3:30 pm

1 stop18h 29m

Incheon Intl

Sat 9/20

5:25 pm-10:27 pm

1 stop19h 02m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

11:05 am-5:40 am

2 stops27h 35m

Incheon Intl

Thu 11/27

6:00 pm-12:39 pm

2 stops33h 39m

$855

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sat 9/13

1:40 pm-6:45 pm

2 stops39h 05m

Incheon Intl

Sat 9/20

12:45 pm-6:14 pm

1 stop19h 29m

$866

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 11/23

1:30 pm-5:45 am

1 stop25h 15m

Incheon Intl

Mon 12/1

7:30 pm-11:02 pm

1 stop18h 32m

$945

ChicagoBusan

ORD - PUS

ORDPUS

Chicago O'Hare Intl

Thu 9/4

4:00 pm-7:00 am

1 stop25h 00m

Busan Gimhae

Mon 9/8

7:45 am-2:25 pm

1 stop20h 40m

$962

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 11/25

7:00 am-10:20 pm

2 stops24h 20m

Seoul Gimpo Intl

Wed 12/3

7:50 am-11:06 am

2 stops18h 16m

$966

ChicagoBusan

ORD - PUS

ORDPUS

Chicago O'Hare Intl

Wed 8/27

5:45 pm-4:35 pm

1 stop32h 50m

Busan Gimhae

Wed 9/3

8:30 am-11:59 am

2 stops41h 29m

$1,008

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 9/18

1:30 pm-4:05 pm

2 stops36h 35m

Incheon Intl

Wed 9/24

6:00 pm-3:18 pm

2 stops35h 18m

$1,029

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Thu 9/4

4:59 pm-4:00 am

1 stop21h 01m

Incheon Intl

Sat 9/20

6:50 pm-10:42 pm

1 stop17h 52m

$1,072

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 57 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, February is the cheapest month in which you can book a flight from Illinois to South Korea (average of $998). Flying from Illinois to South Korea in December is currently the most expensive (average of $1,635). 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 July 31, 2025.

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

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 July 31, 2025.

The most flights from USIL to KR0 are scheduled on a Wednesday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

Reviews of airlines servicing South Korea

Get insights into the airlines that provide service to South Korea. 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 South Korea. Reviews last updated July 31, 2025.
Read reviews from past customers who have flown EVA Air, Korean Air, and ANA from Illinois to South Korea. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Entertainment

8.0

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very good
1,220 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Entertainment

8.0

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Korean Air
8.4
Very good
1,121 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Entertainment

8.0

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
ANA
8.4
Very good
922 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Entertainment

8.0

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Japan Airlines
8.3
Very good
1,536 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Entertainment

8.0

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
China Airlines
8.3
Very good
754 reviews
EVA Air
8.4
Very good
1,220 reviews

Crew

8.6

Entertainment

8.0

Boarding

8.4

Comfort

8.3

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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.

  • What are the cheapest airlines to fly from Illinois to South Korea one-way?

    $384 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Delta and Japan Airlines, with prices starting from $448 and $453, 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, February is the cheapest month in which you can book a flight from Illinois to South Korea (average of $998). Flying from Illinois to South Korea in December is currently the most expensive (average of $1,635). 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 10 airlines flying from Illinois to South Korea

Discover the top 10 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$660Average$1,016FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$805Average$928FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$848Average$1,035FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$891Average$1,299FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$895Average$1,026FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,080Average$1,343FlexibilityNo cancel feeOn-time74%
DeltaCheapest$1,097Average$1,909FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$1,110Average$1,394FlexibilityNo cancel feeOn-time76%
Asiana AirlinesCheapest$1,271Average$1,405FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,505Average$2,075FlexibilityNo cancel feeOn-time81%

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