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

United Airlines and Cathay Pacific are the most popular carriers operating from Illinois to Seoul

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 16h 15m and 27h 41m, respectively.

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

1 flights are operational daily from Illinois to Seoul as of October 2025. The most popular departure time for this route is 12:00PM, with 100% of flights per day taking off in the afternoon.

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 53% 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.

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

As of October 2025, there are 12 flights per week flying from Illinois to Seoul. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.

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 October 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.

$390 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.

6:30 am - 5:10 amORD-ICN

32h 40m1 stop

9:20 pm - 10:41 amICN-ORD

28h 21m2 stops

$828Multiple Airlines

Find Deal

Fri, Oct 31 - Sun, Nov 9

7:58 pm - 4:45 pmSTL-ICN

29h 47m2 stops

7:15 pm - 12:37 pmICN-STL

32h 22m1 stop

$837American Airlines

Find Deal

Mon, Nov 10 - Thu, Nov 27

5:29 pm - 4:15 pmSTL-ICN

31h 46m1 stop

12:45 pm - 4:27 pmICN-STL

18h 42m1 stop

$843United Airlines

Find Deal

Mon, Nov 10 - Thu, Nov 27

4:00 pm - 7:05 pmORD-ICN

37h 05m1 stop

3:00 pm - 12:55 pmICN-ORD

36h 55m1 stop

$852Cathay Pacific

Find Deal

Thu, Oct 23 - Tue, Nov 11

4:00 pm - 7:05 pmORD-ICN

37h 05m1 stop

3:00 pm - 12:55 pmICN-ORD

36h 55m1 stop

$854Cathay Pacific

Find Deal

Thu, Oct 23 - Wed, Nov 12

1:35 pm - 4:40 amSTL-ICN

25h 05m2 stops

12:45 pm - 4:27 pmICN-STL

18h 42m1 stop

$856United Airlines

Find Deal

Tue, Oct 28 - Tue, Nov 4

5:22 pm - 3:30 pmSTL-ICN

32h 08m2 stops

8:05 pm - 9:51 amICN-STL

27h 46m2 stops

$860Delta

Find Deal

Sat, Oct 25 - Sat, Nov 1

6:00 am - 5:20 pmSTL-ICN

21h 20m1 stop

7:30 pm - 11:07 pmICN-STL

17h 37m1 stop

$866Delta

Find Deal

Fri, Oct 24 - Sat, Nov 1

7:16 am - 10:55 amSTL-GMP

37h 39m2 stops

7:40 pm - 1:40 pmGMP-STL

33h 00m2 stops

$910Japan Airlines

Find Deal

Wed, Oct 29 - Wed, Nov 5

7:16 am - 10:05 pmSTL-GMP

24h 49m2 stops

8:00 am - 4:47 pmGMP-STL

23h 47m2 stops

$1,030Japan Airlines

Find Deal

Tue, Oct 28 - Tue, Nov 4

EVA Air flights from Illinois to Seoul

Our best EVA Air deals on Illinois to Seoul flight tickets

EVA Air

Mar 25

ORD12:30 amChicago O'Hare Intl

28h 15m

1 stop

ICN6:45 pmIncheon Intl

Apr 8

ICN12:00 pmIncheon Intl

23h 00m

1 stop

ORD9:00 pmChicago O'Hare Intl

$930

Find similar

EVA Air

Mar 25

ORD12:30 amChicago O'Hare Intl

28h 15m

1 stop

ICN6:45 pmIncheon Intl

Apr 8

ICN7:45 pmIncheon Intl

39h 15m

1 stop

ORD9:00 pmChicago O'Hare Intl

$961

Find similar

EVA Air

Nov 1

ORD12:30 amChicago O'Hare Intl

20h 00m

1 stop

ICN10:30 amIncheon Intl

Nov 18

ICN11:40 amIncheon Intl

22h 55m

1 stop

ORD7:35 pmChicago O'Hare Intl

$969

Find similar

Alaska Airlines flights from Illinois to Seoul

Our best Alaska Airlines deals on Illinois to Seoul flight tickets

Alaska Airlines

Mar 20

STL7:00 amLambert-St Louis

21h 35m

1 stop

ICN6:35 pmIncheon Intl

Mar 29

ICN8:35 pmIncheon Intl

17h 20m

1 stop

STL11:55 pmLambert-St Louis

$980

Find similar

Alaska Airlines

Mar 20

STL7:00 amLambert-St Louis

21h 35m

1 stop

ICN6:35 pmIncheon Intl

Mar 29

ICN8:35 pmIncheon Intl

17h 20m

1 stop

STL11:55 pmLambert-St Louis

$985

Find similar

Alaska Airlines

Mar 20

STL7:00 amLambert-St Louis

21h 35m

1 stop

ICN6:35 pmIncheon Intl

Mar 29

ICN8:35 pmIncheon Intl

17h 20m

1 stop

STL11:55 pmLambert-St Louis

$990

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Fri 10/31

6:30 am-5:10 am

1 stop32h 40m

Incheon Intl

Sun 11/9

9:20 pm-10:41 am

2 stops28h 21m

$828

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

7:58 pm-4:45 pm

2 stops29h 47m

Incheon Intl

Thu 11/27

7:15 pm-12:37 pm

1 stop32h 22m

$837

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 11/10

5:29 pm-4:15 pm

1 stop31h 46m

Incheon Intl

Thu 11/27

12:45 pm-4:27 pm

1 stop18h 42m

$843

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Thu 10/23

4:00 pm-7:05 pm

1 stop37h 05m

Incheon Intl

Tue 11/11

3:00 pm-12:55 pm

1 stop36h 55m

$852

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Thu 10/23

4:00 pm-7:05 pm

1 stop37h 05m

Incheon Intl

Wed 11/12

3:00 pm-12:55 pm

1 stop36h 55m

$854

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 10/28

1:35 pm-4:40 am

2 stops25h 05m

Incheon Intl

Tue 11/4

12:45 pm-4:27 pm

1 stop18h 42m

$856

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Sat 10/25

5:22 pm-3:30 pm

2 stops32h 08m

Incheon Intl

Sat 11/1

8:05 pm-9:51 am

2 stops27h 46m

$860

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Fri 10/24

6:00 am-5:20 pm

1 stop21h 20m

Incheon Intl

Sat 11/1

7:30 pm-11:07 pm

1 stop17h 37m

$866

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Wed 10/29

7:16 am-10:55 am

2 stops37h 39m

Seoul Gimpo Intl

Wed 11/5

7:40 pm-1:40 pm

2 stops33h 00m

$910

St. LouisSeoul

STL - GMP

STLGMP

Lambert-St Louis

Tue 10/28

7:16 am-10:05 pm

2 stops24h 49m

Seoul Gimpo Intl

Tue 11/4

8:00 am-4:47 pm

2 stops23h 47m

$1,030

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 $1,061.

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 $1,053. 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 $1,326.

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 $1,136 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 $1,473 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 $1,382 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 4% 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	$502
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 $502. The best round-trip flight deal from Illinois to Seoul found on momondo in the last 72 hours is $759.

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 October 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 92.68% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 1.27%, Airbus A350-1000 with 1.27%, and Airbus A320-100/200 with 1.27%.

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 $196	Free Cancellation	Rating 7.9 7,962 reviews	Search Delta flights
United Airlines	PriceFrom $287	Free Cancellation	Rating 7.4 8,933 reviews	Search United Airlines flights
Cathay Pacific	PriceFrom $639	Free Cancellation	Rating 7.6 1,015 reviews	Search Cathay Pacific flights
Turkish Airlines	PriceFrom $848	Free Cancellation	Rating 7.3 3,983 reviews	Search Turkish Airlines flights
Air Canada	PriceFrom $916	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
American Airlines	PriceFrom $927	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
EVA Air	PriceFrom $1,085	Free Cancellation	Rating 8.4 1,244 reviews	Search EVA Air flights
Finnair	PriceFrom $1,110	Free Cancellation	Rating 7.6 1,332 reviews	Search Finnair flights
Korean Air	PriceFrom $1,501	Free Cancellation	Rating 8.4 1,145 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.

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Find better results for your trip to South Korea

Fly into one of these airports located in Seoul

Seoul Gimpo Intl Airport

Incheon Intl Airport

Cheap flights from Illinois to Seoul from $390

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 10/31. 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

Filter for what you want

Filter for what you want

Trusted and free

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Find the cheapest flights from Illinois to Seoul

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EVA Air flights from Illinois to Seoul

Our best EVA Air deals on Illinois to Seoul flight tickets

Alaska Airlines flights from Illinois to Seoul

Our best Alaska Airlines deals on Illinois to Seoul flight tickets

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Use the filters below to find and compare flights from Illinois to Seoul that are best for you.

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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 $1,061.

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 4% on your flight if you consider stops on a Illinois to Seoul flight.

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

United Airlines and Cathay Pacific 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?

1 flights are operational daily from Illinois to Seoul as of October 2025. The most popular departure time for this route is 12:00PM, with 100% of flights per day taking off in the afternoon.

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

As of October 2025, there are 12 flights per week flying from Illinois to Seoul. The most common day of the week flights depart is Mon, with 17% 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 16h 15m and 27h 41m, 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