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$335+ Cheap flights from Illinois to Seoul (SEL)

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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEL
feb. 28 — mar. 71
sáb. 2/28
sáb. 3/7
1 adult, Economy
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Cheap flight deals from Illinois to Seoul

Cheapest flights from Illinois to Seoul
Explore the most affordable flight options available from Illinois to Seoul. Find the lowest fares from popular airlines and budget airlines, with prices last updated on enero 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
jue. 3/57:00 am
STL
-
ICN
1 stop20h 35m
Multiple Airlines
dom. 3/158:35 pm
ICN
-
STL
1 stop17h 24m
Multiple Airlines
Deal found 1/27$753
This Justfly.com deal was found by Cheapflights users on 1/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 3/211:50 am
ORD
-
ICN
1 stop30h 15m
Turkish Airlines
mar. 3/1012:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/27$819
This Justfly.com deal was found by Cheapflights users on 1/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/208:10 pm
ORD
-
ICN
1 stop22h 25m
Turkish Airlines
vie. 5/810:15 am
ICN
-
ORD
1 stop46h 00m
Turkish Airlines
Deal found 1/27$828
This FlightHub deal was found by Cheapflights users on 1/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 2/111:50 am
ORD
-
ICN
1 stop39h 30m
Turkish Airlines
mié. 2/412:10 am
ICN
-
ORD
1 stop24h 55m
Turkish Airlines
Deal found 1/28$829
This oojo deal was found by Cheapflights users on 1/28. 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.
mar. 3/109:20 pm
ORD
-
ICN
1 stop31h 00m
Turkish Airlines
mié. 3/1810:45 am
ICN
-
ORD
1 stop46h 40m
Turkish Airlines
Deal found 1/28$838
This Delta deal was found by Cheapflights users on 1/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 4/167:02 am
STL
-
ICN
1 stop18h 18m
Delta
mié. 4/224:25 pm
ICN
-
STL
1 stop21h 09m
Delta
Deal found 1/28$847
This United Airlines deal was found by Cheapflights users on 1/27. 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.
sáb. 5/24:15 pm
STL
-
ICN
2 stops22h 05m
United Airlines
mar. 5/1211:30 am
ICN
-
STL
1 stop20h 52m
United Airlines
Deal found 1/27$851
This Justfly.com deal was found by Cheapflights users on 1/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/208:10 pm
ORD
-
ICN
1 stop22h 25m
Turkish Airlines
mar. 5/1211:20 pm
ICN
-
ORD
1 stop24h 20m
Turkish Airlines
Deal found 1/26$854
This United Airlines deal was found by Cheapflights users on 1/27. 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.
sáb. 5/28:30 am
STL
-
ICN
1 stop40h 30m
United Airlines
vie. 5/154:50 pm
ICN
-
STL
1 stop26h 57m
United Airlines
Deal found 1/27$854
This Justfly.com deal was found by Cheapflights users on 1/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 3/812:50 pm
ORD
-
ICN
1 stop39h 30m
Turkish Airlines
dom. 3/1512:10 am
ICN
-
ORD
1 stop33h 15m
Turkish Airlines
Deal found 1/27$856
This United Airlines deal was found by Cheapflights users on 1/27. 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.
dom. 5/38:30 am
STL
-
ICN
1 stop29h 50m
United Airlines
vie. 5/1511:30 am
ICN
-
STL
2 stops19h 27m
United Airlines
Deal found 1/27$859
This United Airlines deal was found by Cheapflights users on 1/27. 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.
sáb. 8/227:06 pm
STL
-
ICN
1 stop19h 14m
United Airlines
mar. 9/14:50 pm
ICN
-
STL
2 stops36h 31m
United Airlines
Deal found 1/27$860

Find flight deals from Illinois to Seoul

Keep the following information in mind while searching for Illinois to Seoul flight deals. Data was last updated enero 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$753
(Kiwi.com)

One-way from

$335
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$847

Good round-trip deal

$791 or less

Good one-way deal

$402 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 Seoul (SEL)
Search Deals
One-way flight from Illinois to Seoul (SEL)
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High demand for flights, 3% potential price rise
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($70 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Seoul (SEL).
Search Deals
Price to beat on a one-way flight from Illinois to Seoul (SEL).
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Seoul 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 enero 29, 2026.
Use the filters below to find and compare flights from Illinois to Seoul that are best for you.

Fly from

Illinois

Fly to

Seoul

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 4/25

9:31 am-4:00 am

1 stop28h 29m

Incheon Intl

mié. 5/6

6:50 pm-8:07 am

1 stop27h 17m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

jue. 4/16

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

mié. 4/22

7:35 pm-11:59 pm

1 stop18h 24m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

jue. 4/16

6:48 am-4:25 pm

1 stop19h 37m

Incheon Intl

mié. 4/22

4:25 pm-11:34 pm

1 stop21h 09m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

dom. 4/19

4:41 pm-4:00 am

1 stop21h 19m

Incheon Intl

mar. 4/28

7:20 pm-12:25 am

1 stop19h 05m

$847

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 5/2

4:15 pm-4:20 am

2 stops22h 05m

Incheon Intl

lun. 5/11

4:50 pm-9:30 am

2 stops30h 40m

$851

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

sáb. 5/2

4:15 pm-4:20 am

2 stops22h 05m

Incheon Intl

jue. 5/14

4:50 pm-8:18 am

2 stops29h 28m

$851

ChampaignIncheon

CMI - ICN

CMIICN

Champaign University-Willard

lun. 3/2

2:54 pm-4:45 pm

1 stop34h 51m

Incheon Intl

mié. 3/11

5:55 pm-8:54 pm

1 stop16h 59m

$918

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

lun. 4/20

4:15 pm-7:05 pm

1 stop36h 50m

Incheon Intl

dom. 5/10

3:10 pm-1:55 pm

1 stop36h 45m

$945

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

mié. 2/18

3:52 pm-4:15 pm

2 stops33h 23m

Incheon Intl

dom. 2/22

12:45 pm-10:11 am

2 stops36h 26m

$955

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

mié. 4/15

4:15 pm-12:25 am

1 stop42h 10m

Incheon Intl

mar. 4/28

1:55 am-1:55 pm

1 stop26h 00m

$957

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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Best time to book a flight from Illinois to Seoul

Have a flexible travel schedule? Discover the best time to fly to Seoul 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 Seoul

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

Currently, October is the cheapest month in which you can book a flight from Illinois to Seoul (average of $204). Flying from Illinois to Seoul in June is currently the most expensive (average of $1,122). 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 SEL?

Find hourly flight availability from Illinois to Seoul. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated enero 29, 2026.

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

Weekly flight availability from Illinois to Seoul

Explore weekly flight availability from Illinois to Seoul. 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 enero 29, 2026.

The most flights from USIL to SEL 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

Find useful and relevant information for your journey from Illinois to Seoul. 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 Seoul?

    There are many flights that can get you from Illinois to Seoul in 28h 29m. Fly via Delta, American Airlines, or Cathay Pacific to get the fastest option. Airlines will cover a distance of 6670 mi. This flight may include one or multiple stops.

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

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as $446. Users have also found prices from $468 and $491 on American Airlines and Turkish Airlines, respectively.

  • What are the most popular routes from Illinois to Seoul?

    The most popular flight routes from Illinois to Seoul are Chicago O'Hare Intl - Incheon Intl, Chicago O'Hare Intl - Seoul Gimpo Intl and Chicago Midway - Incheon Intl.

  • What are the most reliable airlines from Illinois to Seoul?

    Before booking your flight to Seoul from Illinois, check out the most reliable airlines to get you to your destination on time: Delta (59%), Atlas Air (57%), Korean Air( 52%).

  • What are the cheapest flights from Illinois to Seoul?

    While on average a flight from Illinois to Seoul is generally $2,019, our data shows the cheapest flight currently is $375. When looking at the most popular route, (Chicago O'Hare Intl - Incheon Intl), you can expect to pay $819 for that flight.

  • Can I find deals for flights from Illinois to Seoul that include hotel bookings?

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

  • How can I find direct flights from Illinois to Seoul?

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

  • Can I find deals for business class flights from Illinois to Seoul?

    Yes. Cheapflights offers flight deals from Illinois to Seoul 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 Seoul?

    Currently, October is the cheapest month in which you can book a flight from Illinois to Seoul (average of $204). Flying from Illinois to Seoul in June is currently the most expensive (average of $1,122). 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 Seoul

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Illinois to Seoul

Discover the top 9 airlines that operate flights from Illinois to Seoul. 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 enero 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,885FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,995FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$918FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$870Average$1,120FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$915Average$1,690FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,003Average$1,258FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,095Average$1,322FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,259Average$1,411FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,557Average$1,898FlexibilityNo cancel feeOn-time81%

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