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$315+ Cheap flights from Seoul (SEL) 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 2/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ORD
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Seoul to Illinois

Cheapest flights from Seoul to Illinois
Explore the most affordable flight options available from Seoul to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:15 pmICN - ORD
2 stops26h 59mAmerican Airlines
Wed 2/116:54 amORD - ICN
1 stop18h 51mAmerican Airlines
Deal found 12/16$578
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/258:35 pmICN - ORD
1 stop24h 54mMultiple Airlines
Thu 2/127:00 amORD - ICN
1 stop20h 35mMultiple Airlines
Deal found 12/16$584
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Mon 12/226:00 pmICN - ORD
1 stop22h 09mUnited Airlines
Fri 2/136:25 amORD - ICN
1 stop18h 50mUnited Airlines
Deal found 12/16$608
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Thu 12/2512:45 pmICN - ORD
2 stops21h 10mUnited Airlines
Thu 2/126:25 amORD - ICN
1 stop18h 50mUnited Airlines
Deal found 12/16$620
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2612:45 pmICN - ORD
2 stops22h 40mUnited Airlines
Sun 1/46:15 amORD - ICN
1 stop19h 00mUnited Airlines
Deal found 12/17$640
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:45 pmICN - STL
1 stop18h 59mUnited Airlines
Mon 1/55:45 pmSTL - ICN
2 stops31h 30mUnited Airlines
Deal found 12/17$661
This Asiana Airlines 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 Asiana Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/259:00 pmICN - STL
1 stop17h 59mMultiple Airlines
Mon 1/55:26 pmSTL - ICN
1 stop20h 54mMultiple Airlines
Deal found 12/17$698
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:00 pmICN - ORD
1 stop33h 25mUnited Airlines
Sat 1/39:40 pmORD - ICN
2 stops27h 35mUnited Airlines
Deal found 12/17$708
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/267:30 pmICN - MDW
1 stop30h 36mDelta
Sun 1/45:59 pmMDW - ICN
1 stop30h 31mDelta
Deal found 12/17$1,311
This Delta deal was found by Cheapflights users on 12/16. 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.
Mon 12/227:30 pmICN - MDW
1 stop30h 36mDelta
Sun 12/286:08 pmMDW - ICN
1 stop31h 42mDelta
Deal found 12/16$1,329
This Japan Airlines deal was found by Cheapflights users on 12/15. 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 Japan Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/238:00 amGMP - ORD
2 stops18h 44mMultiple Airlines
Thu 2/125:40 pmORD - GMP
1 stop33h 40mMultiple Airlines
Deal found 12/15$1,371
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:30 pmICN - MDW
1 stop30h 36mDelta
Fri 1/26:08 pmMDW - ICN
1 stop31h 42mDelta
Deal found 12/17$1,377

Find flight deals from Seoul to Illinois

Keep the following information in mind while searching for Seoul to Illinois flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$543
(YBTour)

One-way from

$315
(Kiwi.com)

Popular in

January

Cheapest in

November

Average price

$830

Good round-trip deal

$1,320 or less

Good one-way deal

$1,123 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 Seoul (SEL) to Illinois
Search Deals
One-way flight from Seoul (SEL) to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($184 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($81 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 Seoul (SEL) to Illinois.
Search Deals
Price to beat on a one-way flight from Seoul (SEL) to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seoul to Illinois 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 Seoul to Illinois that are best for you.

Fly from

Seoul

Fly to

Illinois

Route

Depart

Return

Price

IncheonMoline

ICN - MLI

ICNMLI

Incheon Intl

Tue 2/3

7:15 pm-3:27 pm

1 stop35h 12m

Moline Quad-City

Sat 2/7

11:28 am-4:45 pm

2 stops62h 17m

$592

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Wed 2/4

12:45 pm-9:15 pm

2 stops23h 30m

Chicago O'Hare Intl

Sun 2/8

12:45 pm-4:15 pm

1 stop36h 30m

$605

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 3/2

6:00 pm-9:36 pm

1 stop18h 36m

Chicago O'Hare Intl

Mon 3/16

11:15 am-4:40 am

2 stops27h 25m

$605

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 2/17

12:45 pm-11:26 pm

1 stop25h 41m

Chicago O'Hare Intl

Fri 2/27

6:25 am-4:15 pm

1 stop18h 50m

$605

IncheonMoline

ICN - MLI

ICNMLI

Incheon Intl

Tue 2/3

6:00 pm-4:54 pm

2 stops37h 54m

Moline Quad-City

Sat 2/7

8:46 am-4:15 pm

2 stops64h 29m

$606

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Fri 2/20

12:45 pm-6:41 pm

1 stop20h 56m

Chicago O'Hare Intl

Tue 2/24

4:20 pm-5:40 am

1 stop22h 20m

$608

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Tue 2/17

6:00 pm-11:43 pm

2 stops20h 43m

Chicago O'Hare Intl

Thu 2/26

6:25 am-4:15 pm

1 stop18h 50m

$608

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 4/9

5:25 pm-10:29 pm

1 stop19h 04m

Lambert-St Louis

Mon 4/20

5:34 am-3:30 pm

1 stop19h 56m

$629

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Tue 4/14

5:25 pm-8:05 am

2 stops28h 40m

Lambert-St Louis

Tue 4/21

7:20 am-3:30 pm

1 stop18h 10m

$632

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Fri 4/10

5:25 pm-8:55 am

1 stop29h 30m

Lambert-St Louis

Mon 4/20

5:34 am-3:30 pm

1 stop19h 56m

$634

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 Seoul to Illinois

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

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

Currently, August is the cheapest month in which you can book a flight from Seoul to Illinois (average of $201). Flying from Seoul to Illinois in January is currently the most expensive (average of $1,091). 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 SEL to IL?

Find hourly flight availability from Seoul 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 December 18, 2025.

It’s typically best to fly out from Seoul to Illinois in the afternoon. Doing so could potentially save you 24% on the flight price compared to flying at noon, which is usually more expensive.

Weekly flight availability from Seoul to Illinois

Explore weekly flight availability from Seoul 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 December 18, 2025.

The most flights from SEL 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).

How much does it cost to fly round-trip from Seoul to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated December 18, 2025.
Read reviews from past customers who have flown Korean Air, Asiana Airlines, and Delta from Seoul to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Korean Air
8.4
Very good
1,186 reviews

Food

8.1

Boarding

8.5

Entertainment

8.2

Crew

8.7

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Korean Air
8.4
Very good
1,186 reviews
Korean Air
8.4
Very good
1,186 reviews

Food

8.1

Boarding

8.5

Entertainment

8.2

Crew

8.7

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Asiana Airlines
8.2
Very good
493 reviews
Korean Air
8.4
Very good
1,186 reviews

Food

8.1

Boarding

8.5

Entertainment

8.2

Crew

8.7

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Delta
7.9
Good
8,005 reviews
Korean Air
8.4
Very good
1,186 reviews

Food

8.1

Boarding

8.5

Entertainment

8.2

Crew

8.7

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
United Airlines
7.4
Good
9,092 reviews
Korean Air
8.4
Very good
1,186 reviews

Food

8.1

Boarding

8.5

Entertainment

8.2

Crew

8.7

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!
Air Canada
7.1
Good
10,534 reviews
Korean Air
8.4
Very good
1,186 reviews

Food

8.1

Boarding

8.5

Entertainment

8.2

Crew

8.7

Overall

8.4

Comfort

8.3

Reviews

1 / 20
10.0
Excellent

Jacqueline,Aug 2025

ICN - SEA

Well, I was upset at first because I have a special diet and I need to order vegetarian and I couldn’t do it before the trip, but the stewardess were so nice and they gave me sandwiches that were plant-based which I loved!!

Related info for your journey

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

    Departing from Seoul to Illinois will take you 23h 30m. The distance between Seoul and Illinois is about 6533 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $476 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 Air Canada and Korean Air, with prices starting from $563 and $608, respectively.

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

    While some choose either Seoul Gimpo Intl - Chicago O'Hare Intl or Incheon Intl - Chicago Midway, Incheon Intl - Chicago O'Hare Intl is the most popular route from Seoul to Illinois.

  • What are the cheapest flights from Seoul to Illinois?

    The cheapest flight price from Seoul to Illinois is $1,064. On average you can expect to pay $1,225. The most popular route, (Incheon Intl - Chicago O'Hare Intl), can usually be booked for $568.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Seoul to Illinois (average of $201). Flying from Seoul to Illinois in January is currently the most expensive (average of $1,091). 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 Seoul to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Seoul to Illinois

Discover the top 6 airlines that operate flights from Seoul to Illinois. 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
Alaska AirlinesCheapest$197Average$590FlexibilityNo cancel feeOn-time75%
DeltaCheapest$229Average$1,356FlexibilityNo cancel feeOn-timeN/A
Asiana AirlinesCheapest$558Average$1,047FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$586Average$663FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$687Average$1,338FlexibilityNo cancel feeOn-time81%
Air CanadaCheapest$730Average$1,053FlexibilityNo cancel feeOn-time67%

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