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

$534 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on WestJet and EVA Air, with prices starting from $576 and $634, respectively.

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

To save up to 119% on this flight, we recommend booking at least 49 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from South Korea to Illinois from $820 1-2 weeks out and tickets from $1,723 for flights departing within the next 72 hours.

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

The best pricing can be found in the month of February. Prices to Illinois from South Korea average $1,204. You can even find prices in February for less than $1,204, as users have found deals to Illinois from as low as $589. The month of August appears to be one of the more expensive times to travel to Illinois from South Korea. Flying in the targeted month can save you up to 39%.

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

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

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

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

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

Yes. Cheapflights offers flight deals from South Korea 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.

$1,040+ Flights from South Korea to Illinois

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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Cheap flight deals from South Korea to Illinois

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$635 (United Airlines)
One-way from	$330 (Kiwi.com)
Popular in	August
Cheapest in	February
Average price	$1,223
Good round-trip deal	$1,289 or less
Good one-way deal	$912 or less

Provider with most accurate pricing for Seoul (SEL)-Chicago (CHI) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Seoul (SEL)-Chicago (CHI) flights.

Search Deals

From South Korea to Illinois

Search Deals

One-way flight from South Korea to Illinois

Search Deals

Highest demand for flights based on searches. 20% potential increase in price ($314 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($44 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

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

Search Deals

Price to beat on a one-way flight from South Korea to Illinois.

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Find flight deals from South Korea to Illinois

Cheapest flights from South Korea to Illinois
Explore the most affordable flight options available from South Korea to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 17, 2025.

dom. 4/273:45 pmICN - ORD

1 stop37h 25mUnited Airlines

mar. 4/2912:45 pmORD - ICN

1 stop36h 15mUnited Airlines

Deal found 4/15

$635

jue. 10/305:50 pmICN - ORD

1 stop34h 49mAir Canada

lun. 11/103:40 pmORD - ICN

1 stop34h 25mAir Canada

Deal found 4/17

$685

mié. 11/198:10 pmICN - STL

1 stop34h 16mAir Canada

sáb. 11/224:15 pmSTL - ICN

2 stops57h 50mAir Canada

Deal found 4/16

$747

dom. 5/254:00 pmICN - MDW

2 stops35h 38mMultiple Airlines

dom. 6/18:41 pmMDW - ICN

2 stops30h 39mMultiple Airlines

Deal found 4/17

$752

sáb. 5/107:20 pmICN - ORD

1 stop16h 39mMultiple Airlines

jue. 8/78:00 amORD - ICN

1 stop18h 30mMultiple Airlines

Deal found 4/16

$756

dom. 6/110:40 amPUS - ORD

2 stops34h 02mMultiple Airlines

dom. 6/810:00 amORD - PUS

3 stops31h 45mMultiple Airlines

Deal found 4/16

$1,046

dom. 5/116:20 pmICN - STL

1 stop19h 39mMultiple Airlines

jue. 5/156:22 pmSTL - ICN

1 stop33h 33mMultiple Airlines

Deal found 4/16

$1,070

lun. 9/155:25 pmICN - STL

1 stop19h 02mAmerican Airlines

mar. 10/145:28 amSTL - ICN

1 stop20h 02mAmerican Airlines

Deal found 4/17

$1,077

jue. 9/1812:40 pmGMP - ORD

1 stop34h 00mANA

jue. 10/165:45 pmORD - GMP

1 stop38h 35mANA

Deal found 4/16

$1,091

jue. 5/228:55 pmICN - STL

1 stop22h 08mAsiana Airlines

vie. 6/207:10 pmSTL - ICN

1 stop19h 20mAsiana Airlines

Deal found 4/16

$1,101

lun. 6/1611:30 amICN - STL

2 stops23h 18mUnited Airlines

jue. 6/265:41 pmSTL - ICN

1 stop20h 39mUnited Airlines

Deal found 4/16

$1,106

sáb. 10/111:50 pmGMP - ORD

1 stop20h 55mEVA Air

jue. 10/1612:30 amORD - GMP

1 stop22h 20mEVA Air

Deal found 4/17

$1,118

Best flights from South Korea to Illinois
Discover carefully curated flight deals from South Korea to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated abril 17, 2025.

dom. 4/273:45 pmICN - ORD

1 stop37h 25mUnited Airlines

mar. 4/2912:45 pmORD - ICN

1 stop36h 15mUnited Airlines

Deal found 4/15

$635

mié. 5/75:45 pmICN - ORD

1 stop34h 58mAir Canada

mié. 5/143:35 pmORD - ICN

1 stop34h 30mAir Canada

Deal found 4/16

$709

dom. 5/254:00 pmICN - ORD

2 stops32h 41mMultiple Airlines

dom. 6/16:00 amORD - ICN

2 stops45h 20mMultiple Airlines

Deal found 4/17

$746

lun. 9/155:25 pmICN - STL

1 stop19h 02mAmerican Airlines

mar. 10/145:28 amSTL - ICN

1 stop20h 02mAmerican Airlines

Deal found 4/17

$1,077

jue. 9/1812:40 pmGMP - ORD

1 stop34h 00mANA

jue. 10/165:45 pmORD - GMP

1 stop38h 35mANA

Deal found 4/16

$1,091

jue. 5/228:55 pmICN - STL

1 stop22h 08mAsiana Airlines

vie. 6/207:10 pmSTL - ICN

1 stop19h 20mAsiana Airlines

Deal found 4/16

$1,101

sáb. 10/111:50 pmGMP - ORD

1 stop20h 55mEVA Air

jue. 10/1612:30 amORD - GMP

1 stop22h 20mEVA Air

Deal found 4/17

$1,118

jue. 9/186:40 pmICN - MDW

1 stop32h 29mDelta

jue. 10/169:20 amMDW - ICN

1 stop18h 00mDelta

Deal found 4/16

$1,190

mar. 9/237:55 amGMP - ORD

1 stop15h 10mJapan Airlines

lun. 10/201:05 amORD - GMP

1 stop19h 40mJapan Airlines

Deal found 4/16

$1,278

mar. 5/206:40 pmICN - STL

1 stop18h 46mKorean Air

mié. 6/188:49 amSTL - ICN

1 stop18h 31mKorean Air

Deal found 4/16

$1,313

jue. 6/1910:25 pmICN - MDW

2 stops34h 16mKLM

mar. 6/247:21 pmMDW - ICN

2 stops31h 04mKLM

Deal found 4/17

$1,460

sáb. 5/108:30 amICN - MDW

2 stops47h 15mAir France

mié. 5/1412:48 pmMDW - ICN

2 stops27h 42mAir France

Deal found 4/16

$1,474

Last-minute flights from South Korea to Illinois
Discover last-minute flight deals from South Korea to Illinois. Data last updated abril 17, 2025 and is based on user searches.

mar. 4/222:40 pmICN - ORD

1 stop19h 45mAsiana Airlines

sáb. 4/265:50 pmORD - ICN

1 stop20h 30mAsiana Airlines

Deal found 4/16

$1,329

mié. 4/2312:00 pmICN - ORD

1 stop23h 00mEVA Air

jue. 5/112:30 amORD - ICN

1 stop20h 30mEVA Air

Deal found 4/15

$1,252

mié. 4/237:20 pmICN - ORD

1 stop18h 39mKorean Air

mié. 5/712:20 pmORD - ICN

Nonstop14h 30mKorean Air

Deal found 4/16

$1,397

mié. 4/2310:20 amICN - ORD

1 stop37h 20mTurkish Airlines

mié. 5/287:50 pmORD - ICN

1 stop22h 50mTurkish Airlines

Deal found 4/16

$1,493

mié. 4/238:30 amICN - MDW

2 stops47h 50mAir France

lun. 5/51:16 pmMDW - ICN

2 stops27h 14mAir France

Deal found 4/16

$1,576

jue. 4/2412:45 pmICN - ORD

1 stop24h 20mMultiple Airlines

mié. 4/3010:26 pmORD - ICN

1 stop27h 19mMultiple Airlines

Deal found 4/16

$1,009

jue. 4/246:40 pmICN - MDW

1 stop29h 00mDelta

mié. 4/3010:20 amMDW - ICN

1 stop17h 00mDelta

Deal found 4/16

$1,401

jue. 4/2411:30 amICN - STL

2 stops25h 45mUnited Airlines

mié. 4/3010:40 amSTL - ICN

2 stops27h 40mUnited Airlines

Deal found 4/17

$1,417

jue. 4/2410:25 pmICN - ORD

1 stop29h 45mKLM

mié. 5/284:20 pmORD - ICN

1 stop34h 05mKLM

Deal found 4/16

$1,450

jue. 4/246:50 pmICN - STL

1 stop18h 46mKorean Air

mié. 4/3011:15 amSTL - ICN

1 stop16h 05mKorean Air

Deal found 4/17

$1,474

dom. 4/273:45 pmICN - ORD

1 stop37h 25mUnited Airlines

mar. 4/2912:45 pmORD - ICN

1 stop36h 15mUnited Airlines

Deal found 4/15

$635

dom. 4/279:25 pmICN - ORD

2 stops31h 23mAlaska Airlines

mié. 5/77:19 pmORD - ICN

2 stops33h 41mAlaska Airlines

Deal found 4/16

$1,415

One-way flights from South Korea to Illinois
Search for one-way flight options from South Korea to Illinois. Find affordable one-way fares based on user searches. Data last updated abril 17, 2025.

sáb. 5/246:20 pmICN - ORD

2 stops28h 02mMultiple Airlines

Deal found 4/17

$330

mar. 5/612:45 pmICN - STL

2 stops49h 21mMultiple Airlines

Deal found 4/15

$483

mar. 5/612:45 pmICN - MDW

2 stops36h 41mMultiple Airlines

Deal found 4/16

$498

mar. 5/275:25 pmICN - CMI

2 stops55h 19mAmerican Airlines

Deal found 4/17

$534

lun. 6/168:45 pmICN - ORD

1 stop33h 59mWestJet

Deal found 4/16

$576

lun. 5/267:45 pmICN - ORD

1 stop39h 15mEVA Air

Deal found 4/16

$634

mar. 7/17:50 amPUS - ORD

3 stops42h 49mMultiple Airlines

Deal found 4/16

$645

mar. 5/67:05 pmICN - STL

1 stop31h 31mAir Canada

Deal found 4/16

$649

sáb. 5/101:50 pmGMP - ORD

2 stops42h 30mEVA Air

Deal found 4/17

$688

vie. 5/308:45 pmICN - STL

3 stops26h 11mWestJet

Deal found 4/16

$705

mar. 6/37:55 amGMP - ORD

2 stops25h 43mJapan Airlines

Deal found 4/15

$735

vie. 5/3012:45 pmPUS - ORD

2 stops24h 45mAir China

Deal found 4/16

$777

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

dom. 4/27

3:45 pm-3:10 pm

1 stop37h 25m

Chicago O'Hare Intl

mar. 4/29

12:45 pm-3:00 pm

1 stop36h 15m

$635

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

mié. 5/7

5:45 pm-2:43 pm

1 stop34h 58m

Chicago O'Hare Intl

mié. 5/14

3:35 pm-4:05 pm

1 stop34h 30m

$709

IncheonChicago

ICN - MDW

ICNMDW

Incheon Intl

dom. 5/25

4:00 pm-1:38 pm

2 stops35h 38m

Chicago Midway

dom. 6/1

8:41 pm-5:20 pm

2 stops30h 39m

$752

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

sáb. 5/10

7:20 pm-9:59 pm

1 stop16h 39m

Chicago O'Hare Intl

jue. 8/7

8:00 am-4:30 pm

1 stop18h 30m

$756

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

dom. 5/11

5:45 pm-7:58 pm

2 stops40h 13m

Lambert-St Louis

jue. 5/15

1:30 pm-4:05 pm

2 stops36h 35m

$902

BusanChicago

PUS - ORD

PUSORD

Busan Gimhae

dom. 6/1

10:40 am-6:42 am

2 stops34h 02m

Chicago O'Hare Intl

dom. 6/8

10:00 am-7:45 am

3 stops31h 45m

$1,046

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

dom. 5/11

6:20 pm-11:59 pm

1 stop19h 39m

Lambert-St Louis

jue. 5/15

6:22 pm-5:55 pm

1 stop33h 33m

$1,070

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

lun. 9/15

5:25 pm-10:27 pm

1 stop19h 02m

Lambert-St Louis

mar. 10/14

5:28 am-3:30 pm

1 stop20h 02m

$1,077

SeoulChicago

GMP - ORD

GMPORD

Seoul Gimpo Intl

jue. 9/18

12:40 pm-8:40 am

1 stop34h 00m

Chicago O'Hare Intl

jue. 10/16

5:45 pm-10:20 pm

1 stop38h 35m

$1,091

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

jue. 5/22

8:55 pm-5:03 am

1 stop22h 08m

Lambert-St Louis

vie. 6/20

7:10 pm-4:30 am

1 stop19h 20m

$1,101

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 60 results

...

Best time to book a flight from South Korea to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from South Korea 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 South Korea to Illinois

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

Currently, August is the cheapest month in which you can book a flight from South Korea to Illinois (average of $245). Flying from South Korea 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 KR to IL?

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

Weekly flight availability from South Korea to Illinois

The most flights from KR0 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).

Rainfall in Illinois by month

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from South Korea to Illinois, such as EVA Air, Korean Air and Japan Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

EVA Air

8.4

Very good

1,177 reviews

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

EVA Air

8.4

Very good

1,177 reviews

EVA Air

8.4

Very good

1,177 reviews

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Korean Air

8.4

Very good

1,064 reviews

EVA Air

8.4

Very good

1,177 reviews

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Japan Airlines

8.3

Very good

1,447 reviews

EVA Air

8.4

Very good

1,177 reviews

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

ANA

8.3

Very good

845 reviews

EVA Air

8.4

Very good

1,177 reviews

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Asiana Airlines

8.2

Very good

438 reviews

EVA Air

8.4

Very good

1,177 reviews

Reviews

1 / 20

6.0

Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

Related info for your journey

What are the cheapest airlines to fly from South Korea to Illinois one-way?
$534 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on WestJet and EVA Air, with prices starting from $576 and $634, respectively.
Can I find deals for flights from South Korea to Illinois that include hotel bookings?
Yes. In addition to deals on South Korea to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from South Korea to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from South Korea to Illinois.
Can I find deals for business class flights from South Korea to Illinois?
Yes. Cheapflights offers flight deals from South Korea 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 South Korea to Illinois?
Currently, August is the cheapest month in which you can book a flight from South Korea to Illinois (average of $245). Flying from South Korea 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 6 airlines flying from South Korea to Illinois

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$697	Average$976	FlexibilityNo cancel fee	On-time71%
Air Canada	Cheapest$730	Average$1,062	FlexibilityNo cancel fee	On-time67%
Asiana Airlines	Cheapest$1,047	Average$1,268	FlexibilityNo cancel fee	On-time76%
United Airlines	Cheapest$1,119	Average$1,590	FlexibilityNo cancel fee	On-time69%
Korean Air	Cheapest$1,186	Average$1,414	FlexibilityNo cancel fee	On-time81%
Delta	Cheapest$1,269	Average$1,485	FlexibilityNo cancel fee	On-timeN/A

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$329+ Cheap flights from South Korea 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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from South Korea to Illinois with Cheapflights

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3. Compare prices and book

Cheap flight deals from South Korea to Illinois

Keep the following information in mind while searching for South Korea to Illinois flight deals. Data was last updated abril 17, 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 South Korea to Illinois

Cheapest flights from South Korea to IllinoisExplore the most affordable flight options available from South Korea to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 17, 2025.

Explore the most affordable flight options available from South Korea to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 17, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from South Korea to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from South Korea with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from South Korea to Illinois

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

What is the cheapest time of day to fly from KR to IL?

Find hourly flight availability from South Korea 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 abril 17, 2025.

Weekly flight availability from South Korea to Illinois

Explore weekly flight availability from South Korea 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 abril 17, 2025.

Rainfall in Illinois by month

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

Temperature in Illinois by month

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

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from South Korea to Illinois, such as EVA Air, Korean Air and Japan Airlines. Users have also rated airlines 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 South Korea 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 South Korea to Illinois one-way?

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

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

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

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

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 South Korea to Illinois

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

Top 6 airlines flying from South Korea to Illinois

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Cheapest flights from South Korea to Illinois
Explore the most affordable flight options available from South Korea to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 17, 2025.