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

$425 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 WestJet and Turkish Airlines, with prices starting from $453 and $503, 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 $1,487 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.

$1,168+ Flights from Illinois to South Korea - Compare & Save Big

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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	$1,105 (Mytrip)
One-way from	$425 (WhyPayMore)
Popular in	December
Cheapest in	January
Average price	$1,567
Good round-trip deal	$879 or less
Good one-way deal	$531 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

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($96 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 May 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 May 1, 2025.

Mon 11/107:05 amSTL - ICN

1 stop31h 35mUnited Airlines

Thu 11/2712:45 pmICN - STL

1 stop19h 18mUnited Airlines

Deal found 4/29

$993

Mon 11/107:07 pmSTL - ICN

2 stops30h 38mAmerican Airlines

Thu 11/276:50 pmICN - STL

2 stops28h 25mAmerican Airlines

Deal found 4/30

$1,051

Sat 9/276:30 amSTL - ICN

1 stop20h 50mDelta

Sun 10/268:05 pmICN - STL

2 stops18h 32mDelta

Deal found 4/30

$1,060

Tue 9/163:17 pmSTL - ICN

1 stop37h 18mHawaiian Airlines

Fri 9/198:35 pmICN - STL

1 stop17h 24mHawaiian Airlines

Deal found 4/28

$1,083

Mon 6/91:30 amORD - PUS

2 stops29h 40mMultiple Airlines

Tue 6/1712:35 pmPUS - ORD

2 stops34h 40mMultiple Airlines

Deal found 4/29

$1,105

Mon 9/812:30 amORD - GMP

1 stop28h 45mEVA Air

Tue 9/237:15 pmGMP - ORD

1 stop39h 30mEVA Air

Deal found 4/29

$1,121

Fri 10/3112:30 amORD - ICN

1 stop20h 00mEVA Air

Fri 11/711:40 amICN - ORD

1 stop22h 55mEVA Air

Deal found 4/29

$1,158

Tue 10/142:55 pmSTL - ICN

1 stop37h 40mAlaska Airlines

Fri 10/178:35 pmICN - STL

1 stop17h 21mAlaska Airlines

Deal found 4/29

$1,161

Sat 7/54:00 pmORD - ICN

1 stop37h 05mCathay Pacific

Tue 7/223:10 pmICN - ORD

1 stop37h 15mCathay Pacific

Deal found 4/29

$1,162

Sun 5/257:59 pmORD - ICN

2 stops55h 06mMultiple Airlines

Mon 6/210:05 pmICN - ORD

1 stop22h 37mMultiple Airlines

Deal found 4/28

$1,166

Thu 7/2411:25 amORD - ICN

1 stop31h 15mTurkish Airlines

Fri 8/810:20 amICN - ORD

1 stop37h 20mTurkish Airlines

Deal found 4/29

$1,169

Tue 9/164:05 pmSTL - ICN

2 stops34h 00mAir Canada

Fri 9/196:00 pmICN - STL

1 stop39h 57mAir Canada

Deal found 4/28

$1,178

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 May 1, 2025.

Mon 6/91:30 amORD - PUS

2 stops29h 40mMultiple Airlines

Tue 6/1712:35 pmPUS - ORD

2 stops34h 40mMultiple Airlines

Deal found 4/29

$1,105

Mon 9/812:30 amORD - GMP

1 stop28h 45mEVA Air

Tue 9/237:15 pmGMP - ORD

1 stop39h 30mEVA Air

Deal found 4/29

$1,121

Mon 7/76:00 amSTL - ICN

1 stop19h 00mUnited Airlines

Wed 7/164:50 pmICN - STL

1 stop26h 04mUnited Airlines

Deal found 4/29

$1,160

Thu 10/211:25 amORD - ICN

1 stop31h 15mTurkish Airlines

Wed 10/1510:20 amICN - ORD

1 stop37h 20mTurkish Airlines

Deal found 4/30

$1,182

Sat 7/54:00 pmORD - ICN

1 stop39h 10mCathay Pacific

Sat 7/1910:10 amICN - ORD

1 stop42h 15mCathay Pacific

Deal found 4/30

$1,184

Wed 9/31:40 pmORD - ICN

2 stops39h 05mWestJet

Sun 9/218:45 pmICN - ORD

2 stops33h 49mWestJet

Deal found 4/29

$1,214

Wed 10/19:12 pmORD - ICN

2 stops28h 53mAir Canada

Wed 10/155:45 pmICN - ORD

1 stop16h 19mAir Canada

Deal found 4/30

$1,259

Thu 9/254:56 pmORD - ICN

2 stops28h 24mFinnair

Fri 10/3111:00 pmICN - ORD

2 stops36h 02mFinnair

Deal found 4/30

$1,318

Wed 9/171:35 pmORD - ICN

3 stops42h 45mSingapore Airlines

Wed 9/244:45 pmICN - ORD

3 stops42h 09mSingapore Airlines

Deal found 4/30

$1,355

Wed 7/911:23 amSTL - ICN

1 stop15h 57mDelta

Mon 7/147:40 pmICN - STL

1 stop18h 58mDelta

Deal found 4/30

$1,355

Thu 7/106:25 amSTL - GMP

2 stops25h 25mJapan Airlines

Thu 7/177:55 amGMP - STL

2 stops18h 53mJapan Airlines

Deal found 4/29

$1,586

Wed 9/175:45 pmORD - GMP

1 stop27h 20mANA

Wed 10/87:55 pmGMP - ORD

1 stop26h 45mANA

Deal found 4/30

$1,598

Last-minute flights from Illinois to South Korea
Discover last-minute flight deals from Illinois to South Korea. Data last updated May 1, 2025 and is based on user searches.

Wed 4/3012:30 amORD - GMP

1 stop22h 20mMultiple Airlines

Thu 5/292:25 pmGMP - ORD

3 stops34h 30mMultiple Airlines

Deal found 4/29

$1,289

Wed 4/3012:30 amORD - PUS

2 stops28h 05mMultiple Airlines

Thu 5/811:00 amPUS - ORD

3 stops37h 54mMultiple Airlines

Deal found 4/30

$1,467

Thu 5/16:58 pmORD - PUS

2 stops26h 17mChina Airlines

Thu 5/812:15 pmPUS - ORD

2 stops44h 05mChina Airlines

Deal found 4/30

$1,463

Tue 5/63:44 pmORD - ICN

2 stops29h 16mEVA Air

Sat 5/247:45 pmICN - ORD

1 stop39h 15mEVA Air

Deal found 4/30

$1,164

Tue 5/612:30 amORD - ICN

1 stop28h 15mMultiple Airlines

Fri 6/612:45 pmICN - ORD

1 stop24h 10mMultiple Airlines

Deal found 4/30

$1,171

Tue 5/62:57 pmCMI - ICN

2 stops36h 08mQatar Airways

Tue 5/2011:00 amICN - CMI

3 stops41h 27mQatar Airways

Deal found 5/1

$1,783

Wed 5/79:20 amMDW - ICN

2 stops43h 25mWestJet

Fri 6/68:45 pmICN - MDW

2 stops35h 02mWestJet

Deal found 4/30

$1,792

Wed 5/711:50 amORD - GMP

1 stop20h 30mANA

Thu 5/157:40 amGMP - ORD

1 stop21h 15mANA

Deal found 4/30

$2,205

Wed 5/79:20 amMDW - ICN

1 stop18h 00mKorean Air

Wed 5/1410:15 amICN - MDW

1 stop16h 13mKorean Air

Deal found 4/30

$2,297

Thu 5/87:19 pmORD - GMP

2 stops27h 31mEVA Air

Wed 6/48:20 pmGMP - ORD

1 stop38h 40mEVA Air

Deal found 4/29

$1,164

Thu 5/811:50 amORD - GMP

3 stops35h 00mMultiple Airlines

Thu 6/122:25 pmGMP - ORD

2 stops30h 26mMultiple Airlines

Deal found 4/30

$1,462

Thu 5/812:00 pmORD - ICN

1 stop32h 40mAir India

Sat 8/2312:15 pmICN - ORD

1 stop33h 10mAir India

Deal found 4/30

$1,726

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 May 1, 2025.

Thu 8/214:00 pmORD - ICN

1 stop30h 40mCathay Pacific

Deal found 4/30

$425

Sun 8/241:40 pmORD - ICN

2 stops39h 05mWestJet

Deal found 4/30

$453

Sat 8/167:18 pmORD - ICN

1 stop35h 12mMultiple Airlines

Deal found 4/30

$484

Tue 7/297:50 pmORD - ICN

1 stop31h 50mTurkish Airlines

Deal found 4/30

$503

Thu 7/36:00 amSTL - ICN

1 stop19h 00mUnited Airlines

Deal found 4/29

$563

Mon 6/99:12 pmMDW - ICN

3 stops55h 33mMultiple Airlines

Deal found 4/30

$596

Fri 8/224:00 pmORD - GMP

2 stops37h 45mMultiple Airlines

Deal found 4/29

$601

Wed 8/2012:30 amORD - ICN

1 stop20h 30mEVA Air

Deal found 4/30

$641

Wed 8/1312:30 amORD - GMP

1 stop22h 20mEVA Air

Deal found 4/30

$649

Mon 9/86:20 amORD - ICN

2 stops47h 15mChina Airlines

Deal found 4/30

$662

Fri 5/163:03 pmSTL - ICN

2 stops39h 27mMultiple Airlines

Deal found 4/28

$664

Thu 8/289:12 pmORD - ICN

2 stops28h 53mAir Canada

Deal found 4/30

$739

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

ChicagoBusan

ORD - PUS

ORDPUS

Chicago O'Hare Intl

Mon 6/9

1:30 am-9:10 pm

2 stops29h 40m

Busan Gimhae

Tue 6/17

12:35 pm-9:15 am

2 stops34h 40m

$1,105

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Mon 9/8

12:30 am-7:15 pm

1 stop28h 45m

Seoul Gimpo Intl

Tue 9/23

7:15 pm-8:45 pm

1 stop39h 30m

$1,121

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Wed 9/17

12:30 am-11:00 am

1 stop20h 30m

Incheon Intl

Sat 9/27

7:45 pm-8:45 pm

1 stop39h 00m

$1,159

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 7/7

6:00 am-3:00 pm

1 stop19h 00m

Incheon Intl

Wed 7/16

4:50 pm-4:54 am

1 stop26h 04m

$1,160

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sat 7/5

4:00 pm-7:05 pm

1 stop37h 05m

Incheon Intl

Tue 7/22

3:10 pm-2:25 pm

1 stop37h 15m

$1,162

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sun 5/25

7:59 pm-5:05 pm

2 stops55h 06m

Incheon Intl

Mon 6/2

10:05 pm-6:42 am

1 stop22h 37m

$1,166

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Thu 7/24

11:25 am-8:40 am

1 stop31h 15m

Incheon Intl

Fri 8/8

10:20 am-9:40 am

1 stop37h 20m

$1,169

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 6/11

6:30 am-6:45 pm

2 stops22h 15m

Incheon Intl

Sat 6/21

8:45 pm-9:43 am

2 stops26h 58m

$1,221

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Sun 8/31

1:40 pm-6:45 pm

2 stops39h 05m

Incheon Intl

Sun 9/21

8:45 pm-4:43 pm

1 stop33h 58m

$1,235

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Tue 9/2

8:08 pm-4:05 pm

2 stops29h 57m

Incheon Intl

Mon 9/15

7:05 pm-8:01 am

2 stops26h 56m

$1,258

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

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 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?

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

1,186 reviews

Reviews

1 / 20

10.0

Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop

EVA Air

8.4

Very good

1,186 reviews

EVA Air

8.4

Very good

1,186 reviews

Reviews

1 / 20

10.0

Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop

Korean Air

8.4

Very good

1,068 reviews

EVA Air

8.4

Very good

1,186 reviews

Reviews

1 / 20

10.0

Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop

Japan Airlines

8.3

Very good

1,464 reviews

EVA Air

8.4

Very good

1,186 reviews

Reviews

1 / 20

10.0

Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop

China Airlines

8.3

Very good

732 reviews

EVA Air

8.4

Very good

1,186 reviews

Reviews

1 / 20

10.0

Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop

ANA

8.3

Very good

852 reviews

EVA Air

8.4

Very good

1,186 reviews

Reviews

1 / 20

10.0

Excellent

Dale,Apr 2025

SFO - TPE

Great experience. Check in process was excellent - both online and bag drop

Related info for your journey

What are the cheapest airlines to fly from Illinois to South Korea one-way?
$425 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 WestJet and Turkish Airlines, with prices starting from $453 and $503, 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 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

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$1,020	FlexibilityNo cancel fee	On-time69%
Cathay Pacific	Cheapest$805	Average$940	FlexibilityNo cancel fee	On-time72%
Turkish Airlines	Cheapest$848	Average$1,068	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$1,250	FlexibilityNo cancel fee	On-time74%
Finnair	Cheapest$1,110	Average$1,503	FlexibilityNo cancel fee	On-time76%
Delta	Cheapest$1,156	Average$1,850	FlexibilityNo cancel fee	On-timeN/A
Asiana Airlines	Cheapest$1,271	Average$1,595	FlexibilityNo cancel fee	On-time76%
Korean Air	Cheapest$1,519	Average$2,055	FlexibilityNo cancel fee	On-time81%

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$424+ 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 May 1, 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 May 1, 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 May 1, 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 May 1, 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 May 1, 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 May 1, 2025.