How long is the flight from Illinois to South Korea?

Airlines like Cathay Pacific, American Airlines, and Delta fly from Illinois to South Korea in about 21h 20m. The time it takes to get you to your destination can typically vary by up to 18h 15m. 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?

$448 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Air Canada and EVA Air, with prices starting from $572 and $636, respectively.

In terms of precipitation, rainfall in South Korea ranges from 0.8 - 10.2 inches per month. July is typically the wettest month, when rainfall can reach 10.2 in. January is typically the driest time to visit South Korea when rainfall is around 0.8 in.

If weather is an important factor for your trip to South Korea, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 28.4 F).

How far in advance should I book a flight from Illinois to South Korea?

To save on the cost of your flight from Illinois to South Korea, book at least 19 days before your planned departure. Booking around this time can save you about 8% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $900 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $929.

What is the cheapest month to fly from Illinois to South Korea?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, January can be a great choice for travel to South Korea. Flights to South Korea from Illinois in January are about $1,379 on average during January, but can be found for as low as $795.

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.

$330+ Flights from Illinois to South Korea

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Cheap flight deals from Illinois to South Korea

Round-trip from	$725 (lol.travel)
One-way from	$330 (Kiwi.com)
Popular in	December
Cheapest in	January
Average price	$1,238
Good round-trip deal	$847 or less
Good one-way deal	$504 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. 5% potential increase in price ($75 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($64 potential savings vs. average RT price).

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Average for round-trip flights in September 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 September 15, 2025.

Wed 10/14:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Tue 10/1410:10 amICN - ORD

1 stop42h 15mCathay Pacific

Deal found 9/13

$704

Mon 9/294:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Mon 10/138:05 pmICN - ORD

1 stop32h 20mCathay Pacific

Deal found 9/14

$725

Wed 9/244:00 pmORD - ICN

1 stop32h 05mCathay Pacific

Tue 9/303:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 9/13

$726

Thu 10/234:00 pmORD - ICN

1 stop39h 10mCathay Pacific

Wed 11/123:00 pmICN - ORD

1 stop37h 00mCathay Pacific

Deal found 9/13

$730

Tue 10/214:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Mon 11/107:35 pmICN - ORD

1 stop32h 25mCathay Pacific

Deal found 9/15

$745

Thu 9/184:00 pmORD - ICN

1 stop37h 05mCathay Pacific

Mon 10/131:40 pmICN - ORD

1 stop38h 45mCathay Pacific

Deal found 9/15

$754

Sun 11/166:30 amORD - ICN

1 stop42h 40mMultiple Airlines

Sun 11/309:20 pmICN - ORD

2 stops31h 15mMultiple Airlines

Deal found 9/12

$758

Tue 9/164:00 pmORD - ICN

1 stop37h 05mCathay Pacific

Tue 9/303:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 9/15

$760

Mon 10/208:05 pmSTL - ICN

2 stops29h 25mAmerican Airlines

Sun 10/265:55 pmICN - STL

1 stop29h 25mAmerican Airlines

Deal found 9/13

$825

Sat 9/273:59 pmSTL - ICN

1 stop33h 31mAmerican Airlines

Sun 10/265:55 pmICN - STL

1 stop29h 25mAmerican Airlines

Deal found 9/13

$844

Tue 10/285:53 pmSTL - ICN

2 stops32h 02mAmerican Airlines

Tue 11/47:15 pmICN - STL

2 stops29h 05mAmerican Airlines

Deal found 9/13

$849

Fri 10/246:50 amSTL - ICN

1 stop18h 30mDelta

Sat 11/17:30 pmICN - STL

1 stop17h 37mDelta

Deal found 9/15

$856

Best flights from Illinois to South Korea
Discover carefully curated flight deals from Illinois to South Korea that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2025.

Tue 3/32:40 pmORD - ICN

1 stop39h 35mCathay Pacific

Thu 3/127:35 pmICN - ORD

1 stop32h 25mCathay Pacific

Deal found 9/14

$815

Tue 10/286:05 pmSTL - ICN

1 stop31h 50mAmerican Airlines

Tue 11/47:15 pmICN - STL

2 stops29h 05mAmerican Airlines

Deal found 9/13

$849

Fri 10/246:00 amSTL - ICN

1 stop21h 20mDelta

Sat 11/17:30 pmICN - STL

1 stop17h 37mDelta

Deal found 9/13

$856

Thu 10/305:24 pmSTL - ICN

2 stops21h 16mUnited Airlines

Thu 11/612:45 pmICN - STL

1 stop18h 42mUnited Airlines

Deal found 9/15

$856

Thu 10/26:00 amSTL - ICN

1 stop22h 35mAlaska Airlines

Mon 10/138:35 pmICN - STL

1 stop17h 28mAlaska Airlines

Deal found 9/13

$856

Tue 10/215:56 pmMDW - ICN

1 stop20h 59mMultiple Airlines

Mon 10/279:55 pmICN - MDW

1 stop39h 30mMultiple Airlines

Deal found 9/14

$925

Thu 11/1311:30 pmORD - PUS

1 stop27h 10mEVA Air

Wed 11/266:55 pmPUS - ORD

1 stop39h 40mEVA Air

Deal found 9/15

$957

Thu 10/306:39 amSTL - GMP

2 stops25h 26mJapan Airlines

Thu 11/612:05 pmGMP - STL

2 stops26h 37mJapan Airlines

Deal found 9/15

$1,045

Wed 3/48:20 pmORD - ICN

1 stop31h 00mTurkish Airlines

Sun 3/812:10 amICN - ORD

1 stop24h 55mTurkish Airlines

Deal found 9/14

$1,161

Fri 10/39:20 amMDW - ICN

2 stops19h 25mWestJet

Sat 10/118:45 pmICN - MDW

2 stops34h 58mWestJet

Deal found 9/13

$1,568

Thu 11/134:25 pmORD - GMP

1 stop27h 55mANA

Sun 11/307:50 pmGMP - ORD

1 stop26h 30mANA

Deal found 9/13

$1,674

Sat 9/276:40 amSTL - ICN

1 stop19h 45mDelta

Sun 10/267:25 pmICN - STL

1 stop18h 16mDelta

Deal found 9/14

$856

Last-minute flights from Illinois to South Korea
Discover last-minute flight deals from Illinois to South Korea. Data last updated September 15, 2025 and is based on user searches.

Tue 9/164:00 pmORD - ICN

1 stop37h 05mCathay Pacific

Tue 9/303:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 9/15

$760

Tue 9/164:00 pmORD - ICN

1 stop32h 05mCathay Pacific

Wed 9/243:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 9/14

$761

Thu 9/184:00 pmORD - ICN

1 stop37h 05mCathay Pacific

Mon 10/131:40 pmICN - ORD

1 stop38h 45mCathay Pacific

Deal found 9/15

$754

Wed 9/244:00 pmORD - ICN

1 stop32h 05mCathay Pacific

Tue 9/303:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 9/13

$726

Sat 9/273:59 pmSTL - ICN

1 stop33h 31mAmerican Airlines

Sun 10/265:55 pmICN - STL

1 stop29h 25mAmerican Airlines

Deal found 9/13

$844

Mon 9/294:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Mon 10/138:05 pmICN - ORD

1 stop32h 20mCathay Pacific

Deal found 9/14

$725

Wed 10/14:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Tue 10/1410:10 amICN - ORD

1 stop42h 15mCathay Pacific

Deal found 9/13

$704

Mon 10/208:05 pmSTL - ICN

2 stops29h 25mAmerican Airlines

Sun 10/265:55 pmICN - STL

1 stop29h 25mAmerican Airlines

Deal found 9/13

$825

Tue 10/214:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Wed 11/127:35 pmICN - ORD

1 stop32h 25mCathay Pacific

Deal found 9/15

$745

Thu 10/234:00 pmORD - ICN

1 stop32h 05mCathay Pacific

Tue 11/113:00 pmICN - ORD

1 stop37h 00mCathay Pacific

Deal found 9/13

$730

Fri 10/246:50 amSTL - ICN

1 stop18h 30mDelta

Sun 11/27:40 pmICN - STL

1 stop19h 44mDelta

Deal found 9/14

$856

Tue 10/285:53 pmSTL - ICN

2 stops32h 02mAmerican Airlines

Tue 11/47:15 pmICN - STL

2 stops29h 05mAmerican Airlines

Deal found 9/13

$849

One-way flights from Illinois to South Korea
Search for one-way flight options from Illinois to South Korea. Find affordable one-way fares based on user searches. Data last updated September 15, 2025.

Sun 10/261:58 pmORD - ICN

2 stops36h 12mMultiple Airlines

Deal found 9/15

$330

Thu 10/235:30 pmORD - ICN

1 stop35h 15mWestJet

Deal found 9/15

$381

Thu 11/206:20 amMDW - ICN

1 stop32h 20mMultiple Airlines

Deal found 9/14

$383

Thu 10/165:30 pmORD - ICN

1 stop35h 15mWestJet

Deal found 9/13

$384

Wed 10/157:43 pmORD - ICN

2 stops43h 12mMultiple Airlines

Deal found 9/13

$393

Wed 10/227:43 pmORD - ICN

2 stops43h 12mMultiple Airlines

Deal found 9/15

$399

Sat 11/89:18 amORD - ICN

1 stop29h 22mMultiple Airlines

Deal found 9/14

$400

Tue 10/146:40 amORD - ICN

2 stops43h 05mMultiple Airlines

Deal found 9/13

$409

Thu 9/254:56 pmMDW - ICN

2 stops45h 59mMultiple Airlines

Deal found 9/13

$410

Sat 9/277:09 pmORD - ICN

1 stop30h 36mMultiple Airlines

Deal found 9/13

$413

Sat 10/257:43 pmORD - ICN

2 stops43h 57mMultiple Airlines

Deal found 9/14

$414

Thu 10/166:24 pmMDW - ICN

2 stops31h 21mMultiple Airlines

Deal found 9/13

$416

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to South Korea that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Tue 3/3

2:40 pm-9:15 pm

1 stop39h 35m

Incheon Intl

Thu 3/12

7:35 pm-2:00 pm

1 stop32h 25m

$815

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 10/28

6:05 pm-3:55 pm

1 stop31h 50m

Incheon Intl

Tue 11/4

7:15 pm-9:20 am

2 stops29h 05m

$849

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

6:00 am-5:20 pm

1 stop21h 20m

Incheon Intl

Sat 11/1

7:30 pm-11:07 pm

1 stop17h 37m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 10/30

5:24 pm-4:40 am

2 stops21h 16m

Incheon Intl

Thu 11/6

12:45 pm-4:27 pm

1 stop18h 42m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 10/2

6:00 am-6:35 pm

1 stop22h 35m

Incheon Intl

Mon 10/13

8:35 pm-12:03 am

1 stop17h 28m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 9/27

6:40 am-4:25 pm

1 stop19h 45m

Incheon Intl

Sun 10/26

7:25 pm-11:41 pm

1 stop18h 16m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 10/29

5:20 am-3:55 pm

1 stop20h 35m

Incheon Intl

Wed 11/5

7:15 pm-10:58 pm

1 stop18h 43m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 10/25

5:15 pm-4:55 am

1 stop21h 40m

Incheon Intl

Sat 11/1

7:30 pm-11:07 pm

1 stop17h 37m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

6:50 am-3:20 pm

1 stop18h 30m

Incheon Intl

Sun 11/2

7:40 pm-12:24 am

1 stop19h 44m

$856

ChicagoIncheon

MDW - ICN

MDWICN

Chicago Midway

Tue 10/21

5:56 pm-4:55 am

1 stop20h 59m

Incheon Intl

Mon 10/27

9:55 pm-11:25 pm

1 stop39h 30m

$925

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results

...

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 $990). Flying from Illinois to South Korea in December is currently the most expensive (average of $1,633). 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?

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

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

How long is the flight from Illinois to South Korea?
Airlines like Cathay Pacific, American Airlines, and Delta fly from Illinois to South Korea in about 21h 20m. The time it takes to get you to your destination can typically vary by up to 18h 15m. 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?
$448 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Air Canada and EVA Air, with prices starting from $572 and $636, 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 $990). Flying from Illinois to South Korea in December is currently the most expensive (average of $1,633). 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

Browse thousands of different options on Cheapflights for your next trip

Top 9 airlines flying from Illinois to South Korea

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$297	Average$1,016	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$297	Average$1,906	FlexibilityNo cancel fee	On-timeN/A
Cathay Pacific	Cheapest$639	Average$897	FlexibilityNo cancel fee	On-time72%
Turkish Airlines	Cheapest$848	Average$1,036	FlexibilityNo cancel fee	On-time77%
Air Canada	Cheapest$901	Average$1,288	FlexibilityNo cancel fee	On-time67%
American Airlines	Cheapest$926	Average$1,119	FlexibilityNo cancel fee	On-time71%
EVA Air	Cheapest$1,085	Average$1,322	FlexibilityNo cancel fee	On-time74%
Finnair	Cheapest$1,110	Average$1,375	FlexibilityNo cancel fee	On-time76%
Korean Air	Cheapest$1,493	Average$2,079	FlexibilityNo cancel fee	On-time81%

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$330+ 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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to South Korea with Cheapflights

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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 September 15, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to South Korea

Cheapest flights from Illinois to South KoreaExplore 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 September 15, 2025.

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 September 15, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to South Korea that are best for you.

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.

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?

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 September 15, 2025.

Weekly flight availability from Illinois to South Korea

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?

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

Can I find deals for flights from Illinois to South Korea that include hotel bookings?

How can I find direct flights from Illinois to South Korea?

Can I find deals for business class flights from Illinois to South Korea?

What is the cheapest month to book a flight from Illinois to South Korea?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Illinois to South Korea

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Top 9 airlines flying from Illinois to South Korea

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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 September 15, 2025.