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

$436 is the cheapest one-way deal found within the past few days, from Cathay Pacific. You may also be able to find cheap deals on United Airlines and WestJet, with prices starting from $568 and $609, respectively.

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 41 days before your planned departure. Booking around this time can save you about 3% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $927 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,088.

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 $1,486 on average during January, but can be found for as low as $891.

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.

$1,234+ Flights from Illinois to South Korea

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Cheap flight deals from Illinois to South Korea

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$993 (United Airlines)
One-way from	$436 (Mytrip)
Popular in	December
Cheapest in	January
Average price	$1,331
Good round-trip deal	$897 or less
Good one-way deal	$525 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 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. 6% potential increase in price ($97 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($58 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

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Price to beat on a round-trip flight from Illinois to South Korea.

Search Deals

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 April 22, 2025.

Mon 11/101:27 pmSTL - ICN

2 stops25h 13mUnited Airlines

Thu 11/2712:45 pmICN - STL

1 stop19h 18mUnited Airlines

Deal found 4/21

$992

Sun 8/3112:30 amORD - GMP

1 stop27h 40mEVA Air

Tue 9/237:15 pmGMP - ORD

1 stop39h 30mEVA Air

Deal found 4/22

$1,128

Sun 9/712:30 amORD - ICN

1 stop20h 30mMultiple Airlines

Thu 9/118:45 pmICN - ORD

2 stops53h 54mMultiple Airlines

Deal found 4/22

$1,148

Sun 9/712:30 amORD - ICN

1 stop20h 30mEVA Air

Thu 9/1812:00 pmICN - ORD

1 stop22h 45mEVA Air

Deal found 4/21

$1,154

Fri 7/44:00 pmORD - ICN

1 stop37h 05mCathay Pacific

Tue 7/228:05 pmICN - ORD

1 stop32h 20mCathay Pacific

Deal found 4/21

$1,162

Thu 5/11:30 pmSTL - ICN

2 stops36h 35mMultiple Airlines

Thu 5/221:30 pmICN - STL

3 stops35h 55mMultiple Airlines

Deal found 4/22

$1,164

Sun 10/57:50 pmORD - ICN

1 stop31h 50mTurkish Airlines

Fri 10/3110:45 amICN - ORD

1 stop38h 25mTurkish Airlines

Deal found 4/21

$1,182

Mon 4/2812:00 pmSTL - ICN

2 stops34h 40mCathay Pacific

Wed 5/213:10 pmICN - STL

2 stops45h 35mCathay Pacific

Deal found 4/22

$1,233

Wed 10/11:30 pmSTL - ICN

2 stops60h 35mAir Canada

Mon 10/67:05 pmICN - STL

2 stops38h 52mAir Canada

Deal found 4/22

$1,261

Tue 5/61:33 pmORD - ICN

2 stops31h 47mFinnair

Sat 5/249:50 pmICN - ORD

2 stops45h 20mFinnair

Deal found 4/22

$1,273

Thu 4/245:34 pmSTL - ICN

1 stop33h 46mDelta

Sat 5/316:40 pmICN - STL

1 stop18h 46mDelta

Deal found 4/22

$1,281

Wed 10/19:20 amMDW - ICN

2 stops19h 25mWestJet

Fri 10/108:45 pmICN - MDW

2 stops27h 06mWestJet

Deal found 4/20

$1,370

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 April 22, 2025.

Mon 9/15:49 pmSTL - ICN

1 stop20h 31mUnited Airlines

Sat 9/2011:30 amICN - STL

1 stop19h 23mUnited Airlines

Deal found 4/21

$993

Sun 8/3112:30 amORD - GMP

1 stop27h 40mEVA Air

Tue 9/237:15 pmGMP - ORD

1 stop39h 30mEVA Air

Deal found 4/22

$1,128

Sun 9/712:30 amORD - ICN

1 stop20h 30mMultiple Airlines

Thu 9/118:45 pmICN - ORD

2 stops53h 54mMultiple Airlines

Deal found 4/22

$1,148

Wed 7/24:00 pmORD - ICN

1 stop39h 10mCathay Pacific

Thu 7/243:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 4/22

$1,162

Sat 8/911:45 pmORD - ICN

1 stop27h 55mTurkish Airlines

Sat 8/1610:20 amICN - ORD

1 stop25h 40mTurkish Airlines

Deal found 4/22

$1,192

Wed 10/11:30 pmSTL - ICN

2 stops60h 35mAir Canada

Mon 10/67:05 pmICN - STL

2 stops38h 52mAir Canada

Deal found 4/22

$1,261

Tue 5/61:33 pmORD - ICN

2 stops31h 47mFinnair

Sat 5/249:50 pmICN - ORD

2 stops45h 20mFinnair

Deal found 4/22

$1,273

Mon 9/227:15 amORD - ICN

2 stops21h 30mWestJet

Tue 9/308:45 pmICN - ORD

2 stops29h 54mWestJet

Deal found 4/22

$1,339

Sat 9/67:00 amSTL - GMP

2 stops24h 50mJapan Airlines

Fri 9/127:55 amGMP - STL

2 stops18h 53mJapan Airlines

Deal found 4/21

$1,462

Thu 5/86:00 amSTL - ICN

1 stop21h 20mDelta

Thu 5/2210:15 amICN - STL

1 stop20h 32mDelta

Deal found 4/22

$1,510

Thu 9/257:59 pmSTL - ICN

2 stops31h 06mQatar Airways

Wed 10/2912:20 amICN - STL

2 stops36h 14mQatar Airways

Deal found 4/21

$1,546

Mon 9/111:50 amORD - GMP

1 stop20h 30mANA

Tue 9/237:40 amGMP - ORD

1 stop21h 15mANA

Deal found 4/22

$1,604

Last-minute flights from Illinois to South Korea
Discover last-minute flight deals from Illinois to South Korea. Data last updated April 22, 2025 and is based on user searches.

Thu 4/245:34 pmSTL - ICN

1 stop33h 46mDelta

Sat 5/316:40 pmICN - STL

1 stop18h 46mDelta

Deal found 4/22

$1,281

Sat 4/265:58 pmSTL - ICN

1 stop20h 22mUnited Airlines

Sat 5/311:30 amICN - STL

2 stops19h 03mUnited Airlines

Deal found 4/21

$1,280

Sun 4/275:50 pmSTL - ICN

1 stop20h 30mUnited Airlines

Thu 5/1511:30 amICN - STL

1 stop25h 15mUnited Airlines

Deal found 4/21

$1,320

Sun 4/276:00 amSTL - ICN

1 stop18h 10mDelta

Thu 5/1510:15 amICN - STL

1 stop20h 32mDelta

Deal found 4/22

$1,343

Sun 4/2712:30 amORD - GMP

1 stop27h 40mMultiple Airlines

Mon 5/512:05 pmGMP - ORD

1 stop35h 10mMultiple Airlines

Deal found 4/22

$1,433

Sun 4/2711:21 amSTL - ICN

2 stops39h 44mQatar Airways

Wed 5/141:20 amICN - STL

2 stops36h 44mQatar Airways

Deal found 4/22

$1,594

Mon 4/2812:00 pmSTL - ICN

2 stops34h 40mCathay Pacific

Wed 5/213:10 pmICN - STL

2 stops45h 35mCathay Pacific

Deal found 4/22

$1,233

Mon 4/2812:30 amORD - GMP

1 stop28h 45mEVA Air

Tue 5/67:15 pmGMP - ORD

1 stop39h 45mEVA Air

Deal found 4/22

$1,244

Tue 4/294:00 pmORD - ICN

1 stop32h 05mCathay Pacific

Fri 8/153:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 4/21

$1,324

Wed 4/3012:30 amORD - ICN

1 stop20h 30mEVA Air

Tue 5/612:00 pmICN - ORD

1 stop23h 00mEVA Air

Deal found 4/21

$1,161

Wed 4/304:00 pmORD - ICN

1 stop39h 10mMultiple Airlines

Sun 6/151:30 pmICN - ORD

3 stops33h 56mMultiple Airlines

Deal found 4/21

$1,172

Thu 5/11:30 pmSTL - ICN

2 stops36h 35mMultiple Airlines

Thu 5/221:30 pmICN - STL

3 stops35h 55mMultiple Airlines

Deal found 4/22

$1,164

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 April 22, 2025.

Mon 4/284:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Deal found 4/22

$436

Thu 5/297:59 pmORD - ICN

1 stop34h 31mMultiple Airlines

Deal found 4/21

$476

Thu 5/14:00 pmORD - GMP

3 stops51h 05mMultiple Airlines

Deal found 4/22

$562

Tue 5/272:40 pmSTL - ICN

3 stops36h 25mMultiple Airlines

Deal found 4/22

$563

Mon 7/285:30 pmSTL - ICN

2 stops20h 50mUnited Airlines

Deal found 4/22

$568

Wed 6/41:40 pmORD - ICN

2 stops39h 05mWestJet

Deal found 4/22

$609

Sun 5/188:30 amMDW - ICN

2 stops41h 15mMultiple Airlines

Deal found 4/21

$634

Sun 4/2712:30 amORD - ICN

1 stop20h 30mEVA Air

Deal found 4/22

$660

Sun 6/16:00 amSTL - ICN

2 stops46h 45mWestJet

Deal found 4/21

$674

Wed 5/712:30 amORD - GMP

1 stop22h 20mEVA Air

Deal found 4/22

$692

Thu 5/157:59 pmORD - CJU

3 stops58h 36mMultiple Airlines

Deal found 4/20

$703

Thu 5/151:55 pmORD - ICN

1 stop30h 50mEtihad Airways

Deal found 4/21

$718

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

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 9/1

5:49 pm-4:20 am

1 stop20h 31m

Incheon Intl

Sat 9/20

11:30 am-4:53 pm

1 stop19h 23m

$993

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Sun 8/31

12:30 am-6:10 pm

1 stop27h 40m

Seoul Gimpo Intl

Tue 9/23

7:15 pm-8:45 pm

1 stop39h 30m

$1,128

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sun 9/7

12:30 am-11:00 am

1 stop20h 30m

Incheon Intl

Thu 9/11

8:45 pm-12:39 pm

2 stops53h 54m

$1,148

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sun 9/7

12:30 am-11:00 am

1 stop20h 30m

Incheon Intl

Thu 9/18

12:00 pm-8:45 pm

1 stop22h 45m

$1,154

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Fri 7/4

4:00 pm-7:05 pm

1 stop37h 05m

Incheon Intl

Tue 7/22

8:05 pm-2:25 pm

1 stop32h 20m

$1,162

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sun 10/5

7:50 pm-5:40 pm

1 stop31h 50m

Incheon Intl

Fri 10/31

10:45 am-11:10 am

1 stop38h 25m

$1,182

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 10/1

6:30 am-6:35 pm

1 stop22h 05m

Incheon Intl

Mon 10/6

7:05 pm-3:18 pm

1 stop34h 13m

$1,215

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 10/1

1:30 pm-4:05 pm

2 stops60h 35m

Incheon Intl

Mon 10/6

7:05 pm-7:57 pm

2 stops38h 52m

$1,261

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Tue 5/6

1:33 pm-11:20 am

2 stops31h 47m

Incheon Intl

Sat 5/24

9:50 pm-5:10 am

2 stops45h 20m

$1,273

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Tue 9/9

1:55 pm-6:45 pm

2 stops38h 50m

Incheon Intl

Sun 9/21

8:45 pm-4:43 pm

1 stop33h 58m

$1,309

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/20

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 $1,001). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,650). 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).

Rainfall in South Korea by month

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.

Temperature in South Korea by month

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).

Reviews of airlines servicing South Korea

Peruse reviews from past customers who have flown with EVA Air, Korean Air and Japan Airlines from Illinois to South Korea to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

EVA Air

8.4

Very good

1,179 reviews

Reviews

1 / 20

10.0

Excellent

Gary,Apr 2025

DPS - TPE

The staff was excellent. Kind, courteous, and overall just hospitable. Definitely recommend

EVA Air

8.4

Very good

1,179 reviews

EVA Air

8.4

Very good

1,179 reviews

Reviews

1 / 20

10.0

Excellent

Gary,Apr 2025

DPS - TPE

The staff was excellent. Kind, courteous, and overall just hospitable. Definitely recommend

Korean Air

8.4

Very good

1,062 reviews

EVA Air

8.4

Very good

1,179 reviews

Reviews

1 / 20

10.0

Excellent

Gary,Apr 2025

DPS - TPE

The staff was excellent. Kind, courteous, and overall just hospitable. Definitely recommend

Japan Airlines

8.3

Very good

1,450 reviews

EVA Air

8.4

Very good

1,179 reviews

Reviews

1 / 20

10.0

Excellent

Gary,Apr 2025

DPS - TPE

The staff was excellent. Kind, courteous, and overall just hospitable. Definitely recommend

China Airlines

8.3

Very good

727 reviews

EVA Air

8.4

Very good

1,179 reviews

Reviews

1 / 20

10.0

Excellent

Gary,Apr 2025

DPS - TPE

The staff was excellent. Kind, courteous, and overall just hospitable. Definitely recommend

ANA

8.3

Very good

847 reviews

EVA Air

8.4

Very good

1,179 reviews

Reviews

1 / 20

10.0

Excellent

Gary,Apr 2025

DPS - TPE

The staff was excellent. Kind, courteous, and overall just hospitable. Definitely recommend

Related info for your journey

What are the cheapest airlines to fly from Illinois to South Korea one-way?
$436 is the cheapest one-way deal found within the past few days, from Cathay Pacific. You may also be able to find cheap deals on United Airlines and WestJet, with prices starting from $568 and $609, 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 $1,001). Flying from Illinois to South Korea in June is currently the most expensive (average of $1,650). 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 10 airlines flying from Illinois to South Korea

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$660	Average$1,023	FlexibilityNo cancel fee	On-time69%
Cathay Pacific	Cheapest$821	Average$942	FlexibilityNo cancel fee	On-time72%
Turkish Airlines	Cheapest$848	Average$1,056	FlexibilityNo cancel fee	On-time77%
Air Canada	Cheapest$891	Average$1,318	FlexibilityNo cancel fee	On-time67%
American Airlines	Cheapest$895	Average$1,049	FlexibilityNo cancel fee	On-time71%
EVA Air	Cheapest$1,059	Average$1,245	FlexibilityNo cancel fee	On-time74%
Finnair	Cheapest$1,110	Average$1,503	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$1,271	Average$1,832	FlexibilityNo cancel fee	On-timeN/A
Asiana Airlines	Cheapest$1,271	Average$1,880	FlexibilityNo cancel fee	On-time76%
Korean Air	Cheapest$1,520	Average$2,050	FlexibilityNo cancel fee	On-time81%

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$423+ 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 8/21. 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 April 22, 2025.

Most accurate provider

Most trusted provider

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 April 22, 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 April 22, 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 April 22, 2025.

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 April 22, 2025.

Rainfall in South Korea by month

Plan your trip to South Korea by taking into account the average rainfall totals by month.

Temperature in South Korea by month

Plan your trip to South Korea by taking into account the average temperature totals by month.

Reviews of airlines servicing South Korea

Peruse reviews from past customers who have flown with EVA Air, Korean Air and Japan Airlines from Illinois to South Korea to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to South Korea

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 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 April 22, 2025.