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$393+ 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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Illinois to Seoul

Keep the following information in mind while searching for Illinois to Seoul flight deals. Data was last updated June 12, 2025.

Round-trip from

$855
(American Airlines)

One-way from

$393
(FlightHub)

Popular in

December

Cheapest in

January

Average price

$1,592

Good round-trip deal

$823 or less

Good one-way deal

$449 or less
From Illinois to Seoul (SEL)
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One-way flight from Illinois to Seoul (SEL)
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Highest demand for flights based on searches. 5% potential increase in price ($87 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($58 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Illinois to Seoul (SEL).
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Price to beat on a one-way flight from Illinois to Seoul (SEL).
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Find 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/12. 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.
Mon 9/17:59 pmSTL - ICN
2 stops29h 31mAmerican Airlines
Sat 9/205:25 pmICN - STL
1 stop16h 50mAmerican Airlines
Deal found 6/12$855
This United Airlines deal was found by Cheapflights users on 6/12. 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 10/244:50 pmSTL - ICN
2 stops21h 30mUnited Airlines
Sun 11/212:45 pmICN - STL
1 stop19h 18mUnited Airlines
Deal found 6/12$871
This Delta deal was found by Cheapflights users on 6/12. 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 9/128:50 amSTL - ICN
1 stop18h 30mDelta
Sat 10/257:40 pmICN - STL
1 stop19h 42mDelta
Deal found 6/12$962
This Air Canada deal was found by Cheapflights users on 6/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/14:00 pmSTL - ICN
2 stops34h 05mAir Canada
Tue 9/305:45 pmICN - STL
2 stops35h 33mAir Canada
Deal found 6/11$998
This Travelocity deal was found by Cheapflights users on 6/10. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/64:05 pmSTL - ICN
2 stops58h 00mMultiple Airlines
Sun 9/148:30 amICN - STL
2 stops25h 27mMultiple Airlines
Deal found 6/10$1,061
This KAYAK deal was found by Cheapflights users on 6/12. 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.
Sat 10/187:23 amSTL - GMP
2 stops48h 27mJapan Airlines
Mon 10/2712:05 pmGMP - STL
2 stops24h 48mJapan Airlines
Deal found 6/12$1,073
This oojo deal was found by Cheapflights users on 6/10. 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.
Sun 8/1012:30 amORD - GMP
1 stop27h 40mEVA Air
Tue 3/107:00 pmGMP - ORD
1 stop39h 35mEVA Air
Deal found 6/10$1,086
This oojo deal was found by Cheapflights users on 6/10. 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.
Tue 10/211:05 amORD - GMP
1 stop19h 40mJapan Airlines
Wed 10/297:50 amGMP - ORD
1 stop14h 35mJapan Airlines
Deal found 6/10$1,131
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/96:40 amORD - ICN
2 stops23h 00mMultiple Airlines
Tue 7/228:10 amICN - ORD
3 stops35h 53mMultiple Airlines
Deal found 6/10$1,229
This WestJet deal was found by Cheapflights users on 6/9. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/231:40 pmORD - ICN
2 stops39h 05mWestJet
Mon 7/288:45 pmICN - ORD
1 stop33h 59mWestJet
Deal found 6/9$1,231
This Orbitz deal was found by Cheapflights users on 6/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/99:14 pmORD - ICN
2 stops28h 51mAir Canada
Tue 7/226:00 pmICN - ORD
2 stops29h 09mAir Canada
Deal found 6/10$1,234
This Gotogate deal was found by Cheapflights users on 6/10. 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.
Tue 9/161:05 amORD - GMP
1 stop19h 40mMultiple Airlines
Tue 9/237:15 pmGMP - ORD
1 stop39h 30mMultiple Airlines
Deal found 6/10$1,234

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 June 12, 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

Mon 9/1

7:59 pm-3:30 pm

2 stops29h 31m

Incheon Intl

Sat 9/20

5:25 pm-8:15 pm

1 stop16h 50m

$855

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

4:50 pm-4:20 am

2 stops21h 30m

Incheon Intl

Sun 11/2

12:45 pm-6:03 pm

1 stop19h 18m

$871

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 9/12

8:50 am-5:20 pm

1 stop18h 30m

Incheon Intl

Sat 10/25

7:40 pm-1:22 am

1 stop19h 42m

$962

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 9/1

4:00 pm-4:05 pm

2 stops34h 05m

Incheon Intl

Tue 9/30

5:45 pm-3:18 pm

2 stops35h 33m

$998

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 9/6

4:05 pm-4:05 pm

2 stops58h 00m

Incheon Intl

Sun 9/14

8:30 am-7:57 pm

2 stops25h 27m

$1,061

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sat 10/18

7:23 am-9:50 pm

2 stops48h 27m

Seoul Gimpo Intl

Mon 10/27

12:05 pm-10:53 pm

2 stops24h 48m

$1,073

ChicagoSeoul

ORD - GMP

ORDGMP

Chicago O'Hare Intl

Sun 8/10

12:30 am-6:10 pm

1 stop27h 40m

Seoul Gimpo Intl

Tue 3/10

7:00 pm-8:35 pm

1 stop39h 35m

$1,086

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Wed 7/9

6:40 am-7:40 pm

2 stops23h 00m

Incheon Intl

Tue 7/22

8:10 am-6:03 am

3 stops35h 53m

$1,229

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Wed 7/23

1:40 pm-6:45 pm

2 stops39h 05m

Incheon Intl

Mon 7/28

8:45 pm-4:44 pm

1 stop33h 59m

$1,231

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Wed 7/9

9:14 pm-4:05 pm

2 stops28h 51m

Incheon Intl

Tue 7/22

6:00 pm-9:09 am

2 stops29h 09m

$1,234

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 54 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, February is the cheapest month in which you can book a flight from Illinois to Seoul (average of $1,000). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,635). 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 June 12, 2025.

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 June 12, 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).

Rainfall in Seoul by month

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

In terms of precipitation, rainfall in Seoul ranges from 1.1 - 10.0 inches per month. July is typically the wettest month, when rainfall can reach 10.0 in. December is typically the driest time to visit Seoul when rainfall is around 1.1 in.

Temperature in Seoul by month

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

If weather is an important factor for your trip to Seoul, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Seoul

Get insights into the airlines that provide service to Seoul. 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 Seoul. Reviews last updated June 12, 2025.
Read through reviews of airlines operating flights from Illinois to Seoul, such as EVA Air, Korean Air and Japan Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,202 reviews

Entertainment

8.0

Crew

8.6

Overall

8.4

Comfort

8.3

Boarding

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very good
1,202 reviews
EVA Air
8.4
Very good
1,202 reviews

Entertainment

8.0

Crew

8.6

Overall

8.4

Comfort

8.3

Boarding

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Korean Air
8.4
Very good
1,088 reviews
EVA Air
8.4
Very good
1,202 reviews

Entertainment

8.0

Crew

8.6

Overall

8.4

Comfort

8.3

Boarding

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Japan Airlines
8.3
Very good
1,489 reviews
EVA Air
8.4
Very good
1,202 reviews

Entertainment

8.0

Crew

8.6

Overall

8.4

Comfort

8.3

Boarding

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
China Airlines
8.3
Very good
738 reviews
EVA Air
8.4
Very good
1,202 reviews

Entertainment

8.0

Crew

8.6

Overall

8.4

Comfort

8.3

Boarding

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
ANA
8.3
Very good
882 reviews
EVA Air
8.4
Very good
1,202 reviews

Entertainment

8.0

Crew

8.6

Overall

8.4

Comfort

8.3

Boarding

8.4

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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.

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

    For one-way options, check prices for Japan Airlines. According to our data, you can fly for as low as $393. Users have also found prices from $404 and $418 on WestJet 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 (78%), Korean Air (72%), Atlas Air( 23%).

  • What are the cheapest flights from Illinois to Seoul?

    While on average a flight from Illinois to Seoul is generally $2,407, 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 $849 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, February is the cheapest month in which you can book a flight from Illinois to Seoul (average of $1,000). Flying from Illinois to Seoul in December is currently the most expensive (average of $1,635). 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.

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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 10 airlines flying from Illinois to Seoul

Discover the top 10 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$660Average$1,016FlexibilityNo cancel feeOn-time69%
Cathay PacificCheapest$805Average$937FlexibilityNo cancel feeOn-time72%
Turkish AirlinesCheapest$848Average$1,064FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$891Average$1,319FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$895Average$1,029FlexibilityNo cancel feeOn-time71%
EVA AirCheapest$1,079Average$1,293FlexibilityNo cancel feeOn-time74%
FinnairCheapest$1,110Average$1,503FlexibilityNo cancel feeOn-time76%
Asiana AirlinesCheapest$1,271Average$1,405FlexibilityNo cancel feeOn-time76%
DeltaCheapest$1,271Average$1,873FlexibilityNo cancel feeOn-timeN/A
Korean AirCheapest$1,514Average$1,848FlexibilityNo cancel feeOn-time81%

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