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$355+ 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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
SEL — ORD
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Seoul to Illinois

Keep the following information in mind while searching for Seoul to Illinois flight deals. Data was last updated September 15, 2025.

Round-trip from

$635
(Delta)

One-way from

$355
(oojo)

Popular in

January

Cheapest in

November

Average price

$1,400

Good one-way deal

$1,100 or less
From Seoul (SEL) to Illinois
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One-way flight from Seoul (SEL) to Illinois
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Highest demand for flights based on searches. 1% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($63 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a one-way flight from Seoul (SEL) to Illinois.
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Find 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 September 15, 2025.

This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/235:45 pmICN - ORD
1 stop19h 28mAmerican Airlines
Tue 10/2811:00 pmORD - ICN
2 stops26h 55mAmerican Airlines
Deal found 9/15$589
This Delta deal was found by Cheapflights users on 9/14. 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 11/208:05 pmICN - STL
2 stops19h 41mDelta
Mon 11/245:34 pmSTL - ICN
2 stops31h 56mDelta
Deal found 9/14$635
This Delta deal was found by Cheapflights users on 9/13. 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.
Tue 10/287:30 pmICN - STL
1 stop27h 21mDelta
Tue 11/412:14 pmSTL - ICN
1 stop36h 16mDelta
Deal found 9/13$636
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:00 pmICN - ORD
1 stop26h 27mUnited Airlines
Tue 12/307:45 pmORD - ICN
1 stop18h 55mUnited Airlines
Deal found 9/15$639
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/79:25 pmICN - ORD
2 stops30h 44mAlaska Airlines
Mon 11/108:59 pmORD - ICN
2 stops31h 26mAlaska Airlines
Deal found 9/15$645
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/215:25 pmICN - ORD
1 stop27h 59mAmerican Airlines
Sat 9/277:03 pmORD - ICN
1 stop30h 27mAmerican Airlines
Deal found 9/15$646
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/134:50 pmICN - ORD
1 stop27h 05mUnited Airlines
Sat 10/254:25 pmORD - ICN
1 stop22h 15mUnited Airlines
Deal found 9/15$649
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/269:00 pmICN - ORD
1 stop17h 24mMultiple Airlines
Thu 10/305:53 pmORD - ICN
1 stop20h 27mMultiple Airlines
Deal found 9/15$655
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 10/168:35 pmICN - ORD
2 stops46h 26mAlaska Airlines
Mon 10/207:59 pmORD - ICN
2 stops33h 01mAlaska Airlines
Deal found 9/13$656
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1811:30 amICN - ORD
1 stop27h 24mUnited Airlines
Sat 10/256:15 amORD - ICN
1 stop32h 25mUnited Airlines
Deal found 9/15$675
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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.
Wed 10/159:25 pmICN - ORD
2 stops45h 36mAlaska Airlines
Wed 10/228:20 amORD - ICN
2 stops44h 40mAlaska Airlines
Deal found 9/14$678
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/238:35 pmICN - ORD
2 stops46h 26mAlaska Airlines
Tue 10/287:59 pmORD - ICN
2 stops57h 26mAlaska Airlines
Deal found 9/15$692

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 September 15, 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

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 11/20

7:30 pm-11:23 pm

1 stop18h 53m

Lambert-St Louis

Mon 11/24

6:09 pm-3:30 pm

2 stops30h 21m

$635

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Tue 10/28

8:05 pm-8:51 am

2 stops26h 46m

Lambert-St Louis

Tue 11/4

6:14 pm-3:30 pm

2 stops30h 16m

$636

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Fri 12/26

12:45 pm-11:00 pm

2 stops25h 15m

Chicago O'Hare Intl

Sat 1/3

10:00 pm-4:15 pm

1 stop27h 15m

$639

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Sun 12/21

6:00 pm-5:27 am

1 stop26h 27m

Chicago O'Hare Intl

Tue 12/30

7:45 pm-5:40 am

1 stop18h 55m

$639

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 10/13

4:50 pm-5:55 am

1 stop27h 05m

Chicago O'Hare Intl

Sat 10/25

4:25 pm-4:40 am

1 stop22h 15m

$649

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Sat 10/18

11:30 am-12:54 am

1 stop27h 24m

Chicago O'Hare Intl

Sat 10/25

6:15 am-4:40 am

1 stop32h 25m

$675

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Fri 2/13

7:40 pm-5:59 pm

1 stop37h 19m

Lambert-St Louis

Mon 2/16

7:30 am-4:20 pm

1 stop17h 50m

$744

IncheonSt. Louis

ICN - STL

ICNSTL

Incheon Intl

Thu 2/12

6:00 pm-9:04 am

1 stop30h 04m

Lambert-St Louis

Mon 2/16

7:30 am-4:20 pm

1 stop17h 50m

$756

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 10/27

8:35 pm-1:54 pm

2 stops31h 19m

Chicago O'Hare Intl

Tue 11/4

8:59 pm-6:35 pm

2 stops30h 36m

$776

IncheonChicago

ICN - ORD

ICNORD

Incheon Intl

Mon 12/22

6:00 pm-11:59 pm

2 stops20h 59m

Chicago O'Hare Intl

Sun 12/28

9:05 pm-4:15 pm

1 stop28h 10m

$790

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

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 $245). Flying from Seoul 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 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 September 15, 2025.

When flying from Seoul to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 September 15, 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 September 15, 2025.
Read reviews from past customers who have flown Korean Air, Delta, and United Airlines 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
1,139 reviews

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.7

Boarding

8.5

Entertainment

8.2

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
1,139 reviews
Korean Air
8.4
Very good
1,139 reviews

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.7

Boarding

8.5

Entertainment

8.2

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
8.0
Very good
7,954 reviews
Korean Air
8.4
Very good
1,139 reviews

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.7

Boarding

8.5

Entertainment

8.2

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
8,929 reviews
Korean Air
8.4
Very good
1,139 reviews

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.7

Boarding

8.5

Entertainment

8.2

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!!
American Airlines
7.2
Good
10,000 reviews
Korean Air
8.4
Very good
1,139 reviews

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.7

Boarding

8.5

Entertainment

8.2

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
10,000 reviews
Korean Air
8.4
Very good
1,139 reviews

Overall

8.4

Comfort

8.3

Food

8.1

Crew

8.7

Boarding

8.5

Entertainment

8.2

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 18h 53m. The distance between Seoul and Illinois is about 6670 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?

    $355 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on EVA Air and Japan Airlines, with prices starting from $663 and $751, 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 $1,038. On average you can expect to pay $2,323. The most popular route, (Incheon Intl - Chicago O'Hare Intl), can usually be booked for $575.

  • 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 $245). Flying from Seoul 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

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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$229Average$1,356FlexibilityNo cancel feeOn-timeN/A
Asiana AirlinesCheapest$558Average$1,047FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$717Average$970FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$730Average$1,053FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$851Average$1,590FlexibilityNo cancel feeOn-time69%
Korean AirCheapest$857Average$1,327FlexibilityNo cancel feeOn-time81%

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