What airlines fly to Seoul?

Korean Air, Delta and EVA Air 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 45% of people opting to fly with this airline when traveling to Seoul. Keep in mind that there are 10 different airlines that fly to Seoul on a routine basis, so you have a few additional options to choose from.

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 47m and 22h 36m, respectively.

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

As of March 2026, 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.

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

Delta, Cathay Pacific, and Japan Airlines are the most popular carriers operating from Illinois 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 March 2026. The most popular departure time for this route is 11:00AM, with 100% of flights per day taking off at noon.

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 March 2026, there are 10 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.

$350 Cheap Flights from Illinois to Seoul in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Illinois to Seoul

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:05 pm - 4:20 am

STL

ICN

19h 15m

1 stop

4:50 pm - 5:50 am

ICN

STL

27h 00m

1 stop

$817United Airlines

Mon, Apr 13 - Mon, Apr 20

7:05 pm - 4:20 am

STL

ICN

19h 15m

1 stop

11:30 am - 4:56 pm

ICN

STL

19h 26m

2 stops

$822United Airlines

Thu, Apr 16 - Thu, Apr 23

8:30 am - 4:20 am

STL

ICN

29h 50m

1 stop

4:50 pm - 5:50 am

ICN

STL

27h 00m

1 stop

$824United Airlines

Thu, Apr 16 - Thu, Apr 23

3:15 pm - 4:20 am

STL

ICN

23h 05m

2 stops

11:30 am - 8:54 pm

ICN

STL

23h 24m

2 stops

$827Lufthansa

Tue, Apr 14 - Tue, Apr 21

8:30 am - 4:20 am

STL

ICN

29h 50m

1 stop

11:30 am - 8:54 pm

ICN

STL

23h 24m

2 stops

$835Lufthansa

Tue, Apr 14 - Tue, Apr 21

6:01 pm - 5:15 am

ORD

ICN

21h 14m

1 stop

6:00 pm - 7:00 am

ICN

ORD

27h 00m

2 stops

$854Multiple Airlines

Mon, Apr 13 - Mon, Apr 27

12:47 pm - 5:15 am

ORD

ICN

26h 28m

1 stop

6:00 pm - 5:23 am

ICN

ORD

25h 23m

2 stops

$868Multiple Airlines

Fri, May 1 - Fri, May 29

4:05 pm - 4:05 pm

STL

ICN

34h 00m

2 stops

5:45 pm - 3:24 pm

ICN

STL

35h 39m

2 stops

$872Air Canada

Wed, Apr 15 - Wed, Apr 22

4:05 pm - 4:05 pm

STL

ICN

34h 00m

2 stops

5:45 pm - 3:25 pm

ICN

STL

35h 40m

2 stops

$873Air Canada

Mon, Apr 13 - Mon, Apr 20

11:25 am - 8:35 am

ORD

ICN

31h 10m

1 stop

11:20 pm - 6:15 pm

ICN

ORD

32h 55m

1 stop

$929Turkish Airlines

Wed, Apr 22 - Tue, Jul 21

United Airlines flights from Illinois to Seoul

Our best United Airlines deals on Illinois to Seoul flight tickets

United Airlines

Apr 13

STL7:05 pmLambert-St Louis

19h 15m

1 stop

ICN4:20 amIncheon Intl

Apr 20

ICN4:50 pmIncheon Intl

27h 00m

1 stop

STL5:50 amLambert-St Louis

$817

United Airlines

Apr 16

STL7:05 pmLambert-St Louis

19h 15m

1 stop

ICN4:20 amIncheon Intl

Apr 23

ICN11:30 amIncheon Intl

19h 26m

2 stops

STL4:56 pmLambert-St Louis

$822

United Airlines

Apr 16

STL8:30 amLambert-St Louis

29h 50m

1 stop

ICN4:20 amIncheon Intl

Apr 23

ICN4:50 pmIncheon Intl

27h 00m

1 stop

STL5:50 amLambert-St Louis

$824

Lufthansa flights from Illinois to Seoul

Our best Lufthansa deals on Illinois to Seoul flight tickets

Lufthansa

Apr 14

STL3:15 pmLambert-St Louis

23h 05m

2 stops

ICN4:20 amIncheon Intl

Apr 21

ICN11:30 amIncheon Intl

23h 24m

2 stops

STL8:54 pmLambert-St Louis

$827

Lufthansa

Apr 14

STL8:30 amLambert-St Louis

29h 50m

1 stop

ICN4:20 amIncheon Intl

Apr 21

ICN11:30 amIncheon Intl

23h 24m

2 stops

STL8:54 pmLambert-St Louis

$835

Fly from

Fly to

Route

Depart

Return

Price

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 4/13

7:05 pm-4:20 am

1 stop19h 15m

Incheon Intl

Mon 4/20

4:50 pm-5:50 am

1 stop27h 00m

$817

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/16

7:05 pm-4:20 am

1 stop19h 15m

Incheon Intl

Thu 4/23

11:30 am-4:56 pm

2 stops19h 26m

$822

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Thu 4/16

8:30 am-4:20 am

1 stop29h 50m

Incheon Intl

Thu 4/23

4:50 pm-5:50 am

1 stop27h 00m

$824

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 4/14

3:15 pm-4:20 am

2 stops23h 05m

Incheon Intl

Tue 4/21

11:30 am-8:54 pm

2 stops23h 24m

$827

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Tue 4/14

8:30 am-4:20 am

1 stop29h 50m

Incheon Intl

Tue 4/21

11:30 am-8:54 pm

2 stops23h 24m

$835

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Mon 4/13

6:01 pm-5:15 am

1 stop21h 14m

Incheon Intl

Mon 4/27

6:00 pm-7:00 am

2 stops27h 00m

$854

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Fri 5/1

12:47 pm-5:15 am

1 stop26h 28m

Incheon Intl

Fri 5/29

6:00 pm-5:23 am

2 stops25h 23m

$868

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Wed 4/15

4:05 pm-4:05 pm

2 stops34h 00m

Incheon Intl

Wed 4/22

5:45 pm-3:24 pm

2 stops35h 39m

$872

St. LouisIncheon

STL - ICN

STLICN

Lambert-St Louis

Mon 4/13

4:05 pm-4:05 pm

2 stops34h 00m

Incheon Intl

Mon 4/20

5:45 pm-3:25 pm

2 stops35h 40m

$873

ChicagoIncheon

ORD - ICN

ORDICN

Chicago O'Hare Intl

Wed 4/22

11:25 am-8:35 am

1 stop31h 10m

Incheon Intl

Tue 7/21

11:20 pm-6:15 pm

1 stop32h 55m

$929

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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 November is another great option to travel to Seoul, with average flight prices from Illinois averaging around $909.

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 $905. 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 Saturday, with ticket prices averaging around $1,111.

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

Flying to Seoul from Illinois in the evening is the least expensive time of day to depart. momondo users have found prices as low as $982 when looking at flights departing in the evening. In the morning is when there is more demand to fly to Seoul, so prices are often more expensive at around $998 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 $1,517 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 $799 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 16% 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	$518
Fastest flight time	14h 20m
Direct flights	Every day
Airports in Seoul	2 airports

The best one-way flight to Seoul from Illinois in the past 72 hours is $518. The best round-trip flight deal from Illinois to Seoul found on momondo in the last 72 hours is $904.

The fastest flight from Illinois to Seoul takes 14h 20m

Direct flights go from Illinois to Seoul every day.

There are 2 airports in Seoul. From Illinois there are direct flights to 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 March 2026, there are 10 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 93.77% of the total bookings. Other popular models include Airbus A350-900 with 2.20%, Boeing 747-8 with 0.73%, and Boeing 787-10 Dreamliner with 0.73%.

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 8,237 reviews	Search Delta flights
United Airlines	PriceFrom $287	Free Cancellation	Rating 7.4 9,376 reviews	Search United Airlines flights
Cathay Pacific	PriceFrom $639	Free Cancellation	Rating 7.6 1,182 reviews	Search Cathay Pacific flights
Turkish Airlines	PriceFrom $877	Free Cancellation	Rating 7.3 4,240 reviews	Search Turkish Airlines flights
American Airlines	PriceFrom $915	Free Cancellation	Rating 7.1 11,369 reviews	Search American Airlines flights
EVA Air	PriceFrom $966	Free Cancellation	Rating 8.4 1,362 reviews	Search EVA Air flights
Air Canada	PriceFrom $1,095	Free Cancellation	Rating 7.1 10,764 reviews	Search Air Canada flights
Asiana Airlines	PriceFrom $1,234	Free Cancellation	Rating 8.1 502 reviews	Search Asiana Airlines flights
Finnair	PriceFrom $1,259	Free Cancellation	Rating 7.6 1,371 reviews	Search Finnair flights
Korean Air	PriceFrom $1,577	Free Cancellation	Rating 8.4 1,195 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

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Wed 4/1

Wed 4/8

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to South Korea

Nearby airports

Airlines

Cabin classes

Other South Korea destinations

Other flights from Illinois

Complete your trip

Feeling lucky

Fly into one of these airports located in Seoul

Seoul Gimpo Intl Airport

Incheon Intl Airport

Cheap flights from Illinois to Seoul from $350

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 4/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Illinois to Seoul

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

United Airlines flights from Illinois to Seoul

Our best United Airlines deals on Illinois to Seoul flight tickets

Lufthansa flights from Illinois to Seoul

Our best Lufthansa deals on Illinois to Seoul flight tickets

momondo Fare Finder

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

See travel insights to Seoul from

How to get the cheapest flight ticket from Illinois to Seoul

What is the cheapest month to fly to Seoul?

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?

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

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

Can stopping save me money on Illinois to Seoul flights?

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

What airlines fly to Seoul?

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

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

How long does it take to fly to Seoul?

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

Best airlines flying from Illinois to Seoul

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

Why use momondo?

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

Fly your favorite airline to Seoul

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Seoul

List of cabin classes available on flights landing in Seoul. Availability may vary depending on flight origin and airline.

Popular cities in South Korea

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Illinois

According to popular flight searches on momondo this year

Complete your trip to Seoul

Explore popular destinations other users love

According to popular flight searches on momondo this year