How many flights depart from Illinois to Seoul on average per day?

2 flights are operational daily from Illinois to Seoul as of November 2025. The most popular departure time for this route is 11:00AM, with 77% of flights per day taking off at noon.

What airlines fly to Seoul?

Korean Air, Air Canada and Delta are the top three most popular airlines that fly to Seoul from Illinois according to our data. Korean Air is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Seoul. Keep in mind that there are 9 different airlines that fly to Seoul on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Illinois to Seoul?

American Airlines, Japan Airlines, and United Airlines are the most popular carriers operating from Illinois to Seoul

How many flights depart from Illinois to Seoul on average per week?

As of November 2025, there are 14 flights per week flying from Illinois to Seoul. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.

How long does it take to fly to Seoul?

If you’re flying from a popular airport in Illinois, such as Chicago or Moline, and flying into Seoul, then you can expect flight times to average 15h 42m and 33h 30m, respectively.

When did momondo last update prices for flights from Illinois to Seoul?

Prices for flights from Illinois to Seoul refresh daily.

How many operators does momondo search for flights from Illinois to Seoul?

As of November 2025, there are 9 operators available to choose from for flights from Illinois to Seoul.

How old do you have to be to fly from Illinois to Seoul?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Seoul.

What documentation or ID do you need to fly to Seoul?

The required travel and health documents for your Seoul trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seoul. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$380 Cheap Flights from Illinois to Seoul in 2025/26

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 3:50 pmSTL-ICN

18h 50m1 stop

7:25 pm - 11:37 pmICN-STL

19h 12m1 stop

$746Delta

Find Deal

Mon, Feb 2 - Fri, Feb 6

6:10 am - 4:30 pmSTL-ICN

19h 20m2 stops

9:35 am - 5:50 pmICN-STL

23h 15m2 stops

$750Delta

Find Deal

Mon, Feb 2 - Fri, Feb 6

2:01 pm - 5:40 amORD-ICN

24h 39m1 stop

10:20 pm - 6:05 amICN-ORD

22h 45m1 stop

$800Multiple Airlines

Find Deal

Wed, Dec 3 - Wed, Dec 10

2:01 pm - 5:40 amORD-ICN

24h 39m1 stop

10:20 pm - 6:05 amICN-ORD

22h 45m1 stop

$805Multiple Airlines

Find Deal

Wed, Dec 3 - Sun, Dec 14

3:45 pm - 4:15 pmMLI-ICN

33h 30m2 stops

12:45 pm - 9:36 pmICN-MLI

23h 51m2 stops

$820United Airlines

Find Deal

Fri, Jan 23 - Tue, Jan 27

6:55 am - 10:05 pmSTL-GMP

24h 10m2 stops

12:05 pm - 11:57 pmGMP-STL

26h 52m2 stops

$856Japan Airlines

Find Deal

Sat, Dec 6 - Sat, Dec 13

5:50 am - 4:45 pmSTL-ICN

19h 55m1 stop

6:50 pm - 8:28 amICN-STL

28h 38m2 stops

$860American Airlines

Find Deal

Fri, Feb 6 - Fri, Feb 13

5:50 am - 4:45 pmSTL-ICN

19h 55m1 stop

6:50 pm - 11:00 amICN-STL

31h 10m1 stop

$862American Airlines

Find Deal

Fri, Feb 6 - Fri, Feb 13

11:20 am - 5:40 amSTL-ICN

27h 20m2 stops

12:45 pm - 10:58 pmICN-STL

25h 13m2 stops

$870United Airlines

Find Deal

Mon, Feb 2 - Fri, Feb 6

6:55 am - 10:05 pmSTL-GMP

24h 10m2 stops

12:05 pm - 11:59 pmGMP-STL

26h 54m2 stops

$1,033Japan Airlines

Find Deal

Tue, Dec 9 - Fri, Jan 16

United Airlines flights from Illinois to Seoul

Our best United Airlines deals on Illinois to Seoul flight tickets

United Airlines

Jan 23

MLI3:45 pmMoline Quad-City

33h 30m

2 stops

ICN4:15 pmIncheon Intl

Jan 27

ICN12:45 pmIncheon Intl

23h 51m

2 stops

MLI9:36 pmMoline Quad-City

$820

Find similar

United Airlines

Dec 4

STL3:19 pmLambert-St Louis

23h 21m

2 stops

ICN5:40 amIncheon Intl

Dec 9

ICN12:45 pmIncheon Intl

18h 42m

1 stop

STL4:27 pmLambert-St Louis

$846

Find similar

United Airlines

Jan 8

STL2:45 pmLambert-St Louis

23h 55m

2 stops

ICN5:40 amIncheon Intl

Jan 24

ICN12:45 pmIncheon Intl

21h 42m

2 stops

STL7:27 pmLambert-St Louis

$850

Find similar

Qatar Airways flights from Illinois to Seoul

Our best Qatar Airways deals on Illinois to Seoul flight tickets

Qatar Airways

Mar 2

CMI2:54 pmChampaign University-Willard

35h 21m

2 stops

ICN5:15 pmIncheon Intl

Mar 10

ICN12:20 amIncheon Intl

58h 12m

2 stops

CMI8:32 pmChampaign University-Willard

$1,600

Find similar

Qatar Airways

Nov 29

STL7:45 pmLambert-St Louis

30h 30m

2 stops

ICN5:15 pmIncheon Intl

Dec 7

ICN12:20 amIncheon Intl

38h 39m

2 stops

STL11:59 pmLambert-St Louis

$2,232

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 2/2

6:00 am-3:50 pm

1 stop18h 50m

Incheon Intl

Fri 2/6

7:25 pm-11:37 pm

1 stop19h 12m

$746

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 2/2

6:10 am-4:30 pm

2 stops19h 20m

Incheon Intl

Fri 2/6

9:35 am-5:50 pm

2 stops23h 15m

$750

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Wed 12/3

2:01 pm-5:40 am

1 stop24h 39m

Incheon Intl

Wed 12/10

10:20 pm-6:05 am

1 stop22h 45m

$800

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Wed 12/3

2:01 pm-5:40 am

1 stop24h 39m

Incheon Intl

Sun 12/14

10:20 pm-6:05 am

1 stop22h 45m

$805

MolineIncheon

MLI - ICN

MLIICN

Moline Quad-City

Fri 1/23

3:45 pm-4:15 pm

2 stops33h 30m

Incheon Intl

Tue 1/27

12:45 pm-9:36 pm

2 stops23h 51m

$820

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Sat 12/6

6:55 am-10:05 pm

2 stops24h 10m

Seoul Gimpo Intl

Sat 12/13

12:05 pm-11:57 pm

2 stops26h 52m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 2/6

5:50 am-4:45 pm

1 stop19h 55m

Incheon Intl

Fri 2/13

6:50 pm-8:28 am

2 stops28h 38m

$860

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 2/6

5:50 am-4:45 pm

1 stop19h 55m

Incheon Intl

Fri 2/13

6:50 pm-11:00 am

1 stop31h 10m

$862

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 2/2

11:20 am-5:40 am

2 stops27h 20m

Incheon Intl

Fri 2/6

12:45 pm-10:58 pm

2 stops25h 13m

$870

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 12/9

6:55 am-10:05 pm

2 stops24h 10m

Seoul Gimpo Intl

Fri 1/16

12:05 pm-11:59 pm

2 stops26h 54m

$1,033

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Illinois to Seoul

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Seoul?

The month of February is another great option to travel to Seoul, with average flight prices from Illinois averaging around $1,038.

What is the cheapest day to depart on your flight to Seoul?

According to our data, Tuesday is the cheapest day to fly to Seoul from Illinois. The lowest ticket price found for a Tuesday departure recently was $989. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Seoul is Friday, with ticket prices averaging around $1,315.

What is the cheapest time of day to depart on your flight to Seoul?

Flying to Seoul from Illinois in the morning is the least expensive time of day to depart. momondo users have found prices as low as $1,126 when looking at flights departing in the morning. In the afternoon is when there is more demand to fly to Seoul, so prices are often more expensive at around $1,430 per ticket.

What is the cheapest Illinois to Seoul flight route?

Fly from Chicago O'Hare Intl to Incheon Intl for the best Illinois - Seoul flight prices

How far in advance should I book a flight to Seoul?

You are more likely to see cheaper flights to Seoul from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Seoul for around $1,532 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seoul from Illinois for as low as $1,332 on momondo.

What cabin class options are available on Illinois to Seoul flights?

There are 4 cabin classes available to choose from on Illinois to Seoul flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Seoul flights?

You could potentially save up to 3% on your flight if you consider stops on a Illinois to Seoul flight.

Cheap Illinois to Seoul flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Seoul

Best Price Found	$556
Fastest flight time	14h 30m
Direct flights	Every day
Airports in Seoul	1 airport

The best one-way flight to Seoul from Illinois in the past 72 hours is $556. The best round-trip flight deal from Illinois to Seoul found on momondo in the last 72 hours is $782.

The fastest flight from Illinois to Seoul takes 14h 30m

Direct flights go from Illinois to Seoul every day.

There is 1 airport near Seoul: Incheon Intl (ICN)

Search flight deals

When did momondo last update prices for flights from Illinois to Seoul?
Prices for flights from Illinois to Seoul refresh daily.
How many operators does momondo search for flights from Illinois to Seoul?
As of November 2025, there are 9 operators available to choose from for flights from Illinois to Seoul.
How old do you have to be to fly from Illinois to Seoul?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Seoul.
What documentation or ID do you need to fly to Seoul?
The required travel and health documents for your Seoul trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seoul. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Illinois to Seoul?
Based on momondo bookings for flights between Illinois and Seoul, the leading plane model is Boeing 777-300ER, making up 89.26% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 2.76%, Boeing 777-300 with 2.15%, and Airbus A350-1000 with 1.84%.

Best airlines flying from Illinois to Seoul

Compare and see reviews for airlines that fly from Illinois to Seoul with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $194	Free Cancellation	Rating 7.9 8,002 reviews	Search Delta flights
United Airlines	PriceFrom $287	Free Cancellation	Rating 7.4 9,029 reviews	Search United Airlines flights
Cathay Pacific	PriceFrom $639	Free Cancellation	Rating 7.6 1,064 reviews	Search Cathay Pacific flights
Turkish Airlines	PriceFrom $848	Free Cancellation	Rating 7.3 4,044 reviews	Search Turkish Airlines flights
American Airlines	PriceFrom $926	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights
EVA Air	PriceFrom $1,015	Free Cancellation	Rating 8.4 1,280 reviews	Search EVA Air flights
Air Canada	PriceFrom $1,067	Free Cancellation	Rating 7.1 10,463 reviews	Search Air Canada flights
Finnair	PriceFrom $1,110	Free Cancellation	Rating 7.6 1,334 reviews	Search Finnair flights
Korean Air	PriceFrom $1,503	Free Cancellation	Rating 8.4 1,170 reviews	Search Korean Air flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Seoul?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Seoul. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to Seoul with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Seoul from Illinois with this policy.

How can momondo help me find flights from Illinois to Seoul?

momondo provides multiple filters to help you find the best flight to Seoul from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Illinois to Seoul right now. Can momondo alert me if prices change?

Price alerts on flights to Seoul from Illinois are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Seoul trip

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Fly into one of these airports located in Seoul

Seoul Gimpo Intl Airport

Incheon Intl Airport

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Cheap flights from Illinois to Seoul from $380

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Seoul departing on 1/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names and deals

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Filter for what you want

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United Airlines flights from Illinois to Seoul

Our best United Airlines deals on Illinois to Seoul flight tickets

Qatar Airways flights from Illinois to Seoul

Our best Qatar Airways deals on Illinois to Seoul flight tickets

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How to get the cheapest flight ticket from Illinois to Seoul

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seoul?

The month of February is another great option to travel to Seoul, with average flight prices from Illinois averaging around $1,038.

What is the cheapest day to depart on your flight to Seoul?

What is the cheapest time of day to depart on your flight to Seoul?

What is the cheapest Illinois to Seoul flight route?

Fly from Chicago O'Hare Intl to Incheon Intl for the best Illinois - Seoul flight prices

How far in advance should I book a flight to Seoul?

What cabin class options are available on Illinois to Seoul flights?

There are 4 cabin classes available to choose from on Illinois to Seoul flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Seoul flights?

You could potentially save up to 3% on your flight if you consider stops on a Illinois to Seoul flight.

What is the cheapest airline that flies from Illinois to Seoul?

American Airlines, Japan Airlines, and United Airlines are the most popular carriers operating from Illinois to Seoul

What airlines fly to Seoul?

How many flights depart from Illinois to Seoul on average per day?

2 flights are operational daily from Illinois to Seoul as of November 2025. The most popular departure time for this route is 11:00AM, with 77% of flights per day taking off at noon.

How many flights depart from Illinois to Seoul on average per week?

As of November 2025, there are 14 flights per week flying from Illinois to Seoul. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.

How long does it take to fly to Seoul?

If you’re flying from a popular airport in Illinois, such as Chicago or Moline, and flying into Seoul, then you can expect flight times to average 15h 42m and 33h 30m, respectively.

Cheap Illinois to Seoul flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Seoul

Best Price Found

Fastest flight time

Direct flights

Airports in Seoul

When did momondo last update prices for flights from Illinois to Seoul?

How many operators does momondo search for flights from Illinois to Seoul?

How old do you have to be to fly from Illinois to Seoul?

What documentation or ID do you need to fly to Seoul?

What is the most popular plane model from Illinois to Seoul?

Best airlines flying from Illinois to Seoul

Compare and see reviews for airlines that fly from Illinois to Seoul with momondo

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Seoul?

Can I find flights from Illinois to Seoul with flexible booking policies on momondo?

How can momondo help me find flights from Illinois to Seoul?

I’m not ready to book a flight from Illinois to Seoul right now. Can momondo alert me if prices change?

An easier way to manage your Seoul trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to South Korea

Fly into one of these airports located in Seoul

Airports listed have a maximum distance of 30.3 mi from Seoul