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$340+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEL
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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 December 18, 2025.

This Gotogate deal was found by Cheapflights users on 12/17. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:35 pmORD - ICN
1 stop31h 10mCathay Pacific
Sun 1/251:45 pmICN - ORD
1 stop38h 10mCathay Pacific
Deal found 12/17$1,232
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/247:44 pmORD - ICN
1 stop29h 36mMultiple Airlines
Wed 1/216:55 pmICN - ORD
2 stops38h 36mMultiple Airlines
Deal found 12/17$1,273
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/314:25 pmORD - ICN
1 stop21h 15mMultiple Airlines
Sun 1/256:55 pmICN - ORD
2 stops19h 42mMultiple Airlines
Deal found 12/17$1,328
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/247:44 pmORD - ICN
1 stop29h 36mMultiple Airlines
Fri 1/236:55 pmICN - ORD
2 stops19h 55mMultiple Airlines
Deal found 12/17$1,333
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/247:44 pmORD - ICN
1 stop29h 36mMultiple Airlines
Sat 1/246:55 pmICN - ORD
2 stops19h 55mMultiple Airlines
Deal found 12/17$1,336
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/314:25 pmORD - ICN
1 stop31h 30mMultiple Airlines
Thu 1/159:20 pmICN - ORD
2 stops31h 15mMultiple Airlines
Deal found 12/17$1,340
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Thu 12/256:02 pmORD - ICN
1 stop31h 18mMultiple Airlines
Sat 1/246:55 pmICN - ORD
2 stops19h 55mMultiple Airlines
Deal found 12/17$1,341
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/314:25 pmORD - ICN
1 stop34h 20mMultiple Airlines
Sat 1/179:20 pmICN - ORD
2 stops32h 18mMultiple Airlines
Deal found 12/17$1,351
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Tue 12/304:25 pmORD - ICN
1 stop30h 50mMultiple Airlines
Thu 1/159:20 pmICN - ORD
2 stops31h 15mMultiple Airlines
Deal found 12/17$1,360
This KAYAK deal was found by Cheapflights users on 12/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:55 pmORD - ICN
1 stop42h 15mLOT
Sun 1/188:50 amICN - ORD
2 stops50h 05mLOT
Deal found 12/17$1,369
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Tue 12/304:25 pmORD - ICN
1 stop30h 50mMultiple Airlines
Sat 1/179:20 pmICN - ORD
2 stops32h 18mMultiple Airlines
Deal found 12/17$1,372
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/247:44 pmORD - ICN
1 stop29h 36mMultiple Airlines
Tue 1/209:20 pmICN - ORD
2 stops32h 18mMultiple Airlines
Deal found 12/17$1,385

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$646
(Delta)

One-way from

$340
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$2,072

Good round-trip deal

$793 or less

Good one-way deal

$583 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)
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One-way flight from Illinois to Seoul (SEL)
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High demand for flights, 5% potential price rise
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($66 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 2025.
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

Fri 3/27

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Wed 4/8

8:35 pm-11:55 pm

1 stop17h 20m

$646

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 1/16

6:35 am-4:50 pm

1 stop19h 15m

Incheon Intl

Fri 1/23

7:40 pm-9:38 pm

1 stop16h 58m

$646

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 3/25

7:00 am-6:35 pm

1 stop21h 35m

Incheon Intl

Wed 4/8

8:35 pm-11:55 pm

1 stop17h 20m

$646

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sun 2/15

5:25 pm-5:40 am

1 stop21h 15m

Incheon Intl

Thu 2/19

12:45 pm-4:44 pm

1 stop18h 59m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 1/13

6:10 am-3:30 pm

1 stop18h 20m

Incheon Intl

Tue 1/20

9:35 am-4:37 pm

1 stop22h 02m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 1/31

5:04 pm-5:45 am

1 stop21h 41m

Incheon Intl

Sat 2/7

9:35 am-4:37 pm

1 stop22h 02m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 1/31

1:15 pm-5:40 am

2 stops25h 25m

Incheon Intl

Sat 2/7

12:45 pm-9:13 pm

2 stops23h 28m

$750

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 2/7

5:56 pm-3:30 pm

2 stops30h 34m

Incheon Intl

Sun 4/26

7:00 pm-12:36 am

2 stops19h 36m

$750

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 1/21

7:04 am-10:05 pm

2 stops24h 01m

Seoul Gimpo Intl

Sun 1/25

7:40 pm-11:59 pm

2 stops43h 19m

$780

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Fri 2/13

5:22 pm-4:15 pm

2 stops31h 53m

Incheon Intl

Tue 2/17

6:00 pm-10:11 am

2 stops31h 11m

$820

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 60 results
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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 $201). Flying from Illinois to Seoul in June is currently the most expensive (average of $1,222). 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 December 18, 2025.

A simple way to save on the total cost of your ticket is to fly from Illinois to Seoul at noon. If you’re flexible enough to do this you can expect to save up to 45% on your trip compared to booking a flight in the afternoon.

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 December 18, 2025.

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 19h 15m. Fly via Delta, Japan Airlines, or United Airlines 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 $491 and $504 on Turkish Airlines and American 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 (64%), Korean Air (51%), Atlas Air( 42%).

  • What are the cheapest flights from Illinois to Seoul?

    While on average a flight from Illinois to Seoul is generally $2,278, our data shows the cheapest flight currently is $417. When looking at the most popular route, (Chicago O'Hare Intl - Incheon Intl), you can expect to pay $791 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 $201). Flying from Illinois to Seoul in June is currently the most expensive (average of $1,222). 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$194Average$1,881FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$1,476FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$639Average$899FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$849Average$1,076FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$926Average$1,475FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,003Average$1,310FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$1,095Average$1,336FlexibilityNo cancel feeOn-time67%
FinnairCheapest$1,110Average$1,375FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$1,503Average$1,893FlexibilityNo cancel feeOn-time81%

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