$529 Find Cheap Flights from Seoul to Illinois - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seoul to Illinois departing on 9/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seoul to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seoul to Illinois, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Book Cheap Seoul to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seoul to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seoul to Illinois

Mon, Jul 27 - Wed, Aug 26
WestJet Logo
8:45 pm - 4:40 pm
ICN
-
ORD
33h 55m
1 stop
WestJet Logo
5:30 pm - 6:45 pm
ORD
-
ICN
35h 15m
1 stop
$1,147WestJet
Mon, Oct 12 - Thu, Oct 22
Singapore Airlines Logo
11:50 pm - 6:20 am
ICN
-
ORD
44h 30m
2 stops
Singapore Airlines Logo
7:16 pm - 9:50 am
ORD
-
ICN
48h 34m
2 stops
$1,155Singapore Airlines
Mon, Oct 12 - Thu, Oct 22
Singapore Airlines Logo
11:50 pm - 6:20 am
ICN
-
ORD
44h 30m
2 stops
Singapore Airlines Logo
7:16 pm - 9:50 am
ORD
-
ICN
48h 34m
2 stops
$1,157Singapore Airlines
Mon, Sep 14 - Mon, Sep 28
Air Canada Logo
5:45 pm - 2:43 pm
ICN
-
ORD
34h 58m
1 stop
Air Canada Logo
3:40 pm - 4:05 pm
ORD
-
ICN
34h 25m
1 stop
$1,201Air Canada
Mon, Sep 14 - Thu, Sep 24
Air Canada Logo
5:45 pm - 2:43 pm
ICN
-
ORD
34h 58m
1 stop
Air Canada Logo
3:40 pm - 4:05 pm
ORD
-
ICN
34h 25m
1 stop
$1,214Air Canada
Mon, Jul 27 - Wed, Aug 26
Multiple Airlines Logo
7:05 pm - 2:55 pm
ICN
-
ORD
33h 50m
2 stops
Multiple Airlines Logo
5:30 pm - 6:45 pm
ORD
-
ICN
35h 15m
1 stop
$1,215Multiple Airlines
Tue, Nov 17 - Wed, Dec 2
Philippine Airlines Logo
8:30 pm - 4:55 pm
ICN
-
ORD
35h 25m
1 stop
Philippine Airlines Logo
10:45 pm - 7:15 pm
ORD
-
ICN
29h 30m
1 stop
$1,222Philippine Airlines
Wed, Jul 1 - Wed, Jul 8
Multiple Airlines Logo
12:30 am - 9:10 pm
ICN
-
ORD
34h 40m
3 stops
Multiple Airlines Logo
12:30 am - 7:25 pm
ORD
-
ICN
28h 55m
2 stops
$1,230Multiple Airlines
Mon, Sep 14 - Sat, Sep 26
Delta Logo
7:00 pm - 8:50 am
ICN
-
MDW
27h 50m
2 stops
Delta Logo
7:13 pm - 5:20 pm
MDW
-
ICN
32h 07m
1 stop
$1,520Delta
Mon, Sep 14 - Sat, Sep 26
Delta Logo
7:00 pm - 9:07 am
ICN
-
MDW
28h 07m
2 stops
Delta Logo
7:13 pm - 5:20 pm
MDW
-
ICN
32h 07m
1 stop
$1,529Delta
Booking Insights

KAYAK's insights & trends for Seoul to Illinois flights

Get data-powered insights and trends into flights from Seoul to Illinois to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Seoul to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Seoul to Illinois departing in July.

What is the cheapest Seoul to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Seoul found in the last 5 days was to Chicago, at $1,822 round-trip. The most popular route is from Incheon Intl Airport (ICN) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 5 days was $1,822.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Seoul to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $1,464 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $1,464.

Can I save money by flying with a layover from Seoul to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $1,323 on average.

What is the cheapest month to fly from Seoul to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seoul to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seoul to Illinois is August, when tickets cost $117 (return) on average. On the other hand, the most expensive months are July and February, when the average cost of round-trip tickets is $886 and $584 respectively.

What’s the cheapest day of the week to fly from Seoul to Illinois?

The average price of all round-trip flights from Seoul to Illinois clicked on KAYAK for each day over the last 12 months.

When flying from Seoul to Illinois, you should consider leaving on a Wednesday and avoid Tuesdays if you are looking for the best rates. For your return to Seoul, you’ll find the best rates on Tuesdays and the most expensive ones on Saturdays.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seoul to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seoul to Illinois, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$529
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 82% increase in price.
Flight from Seoul Incheon Airport to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Seoul to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seoul to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seoul to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seoul to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seoul to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Seoul to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seoul to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seoul to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Seoul to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Seoul to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seoul to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.4
Korean AirOverall score based on 1218 reviews
8.7Crew
8.2Entertainment
8.5Boarding
8.3Comfort
8.1Food
Airline reviews

Very long flight time. Still better than a connection flight. Staff is very good at service. Vegetarian food is not very good.

8.0 ExcellentGary, Apr 2026
ICN - YYZ
Read more Korean Air reviews

Very long flight time. Still better than a connection flight. Staff is very good at service. Vegetarian food is not very good.

The business class is excellent. I loved the food, and the crew was very attentive and professional. From boarding to arrival, everything felt smooth and well-organised.

Lousy entertainment system. Crews are excellent. Meal is just mediocre.

Aircraft is pretty old. Seat is not comfortable. Meal quality is disappointing. Entertainment system is not impressive at all.

Great service and comfort level. You can have more of vegetarian food options.

It’s great, long flight and arrive safe at destination

Everything was excellent as I expected. They also had a very caring crew. I had a headache and asked a Tylenol. The crew members kept checking with me how I was doing.

I can't believe they put my wife and I in the two middle seats! It is a very long flight and we had single flyers on either side of us blocking the way to the bathroom! There's no reason to not give one of us the isle seat so we could have managed bathroom needs and snacks with convenience. So I think very poorly of Korean air to put us both in the middle, I've never had that happen before and will probably avoid this airline in the future because of this. We tried to have them change it but they didn't so you pretty much lost a customer because of it.

There could have been better spacing of the passengers, it was crowded in some parts of the plane then other while rows were empty

Plane took off on time and I had the whole row to myself!

Smooth sailing trip, pilots are good. Less amount of food offered but the quality is okey.

The staff hold my luggage to steel and exchange my stub, i was very disappointed.

Kayak uses scammer sites to steal money from their victims.

When one asks for water because they are dehydrated, bring more then a sip or two in a small cup. Bring them a whole bottle.

Food could be better it was okay. Entertainment seems dated it was something but in this day and age could be a lot better.

I’d have rated Asiana good except an unfortunate incident in which I felt one of your employee didn’t really help us. During the first leg of the trip, the flight from LAX to ICN, I left my backpack on the plane. When I realized, I reported to one of your employee who promised me that it’d be taken care of, that my backpack will be there at HCM city. When we arrived there, HCM people had no idea and my backpack was still at Incheon airport who denied any knowledge whatsoever. I was left in the cold and felt helpless. I was very disappointed. I’d like someone to look into this and let me know.

I am thankful that I was able to fly using Asiana

It was my first time flying Asiana but i was very pleased with how professional and understanding the flight crew is with little kids. One flight attendant held my 3 year old daughter’s hand guiding her to the exit after landing while i had my hands full with luggage and my infant. She was very helpful.

The customer service was excellent. They noticed that our connecting flight was scheduled too closely for us to complete customs, so they changed the flight. Our initial flight was delayed, and they were able to get us on another flight, all without charging us any additional fees. I would fly them again anytime!

2nd major delay due to maintenance issues. 1st delay missed my connecting flight.

A five hour nonstop flight traveling over a few time zones and over the dinner hour and you get a small bag of pretzels. And no screens to watch movies. I

The flight kept getting delayed due to a maintenance issue. That happens, but there is no excuse for changing the gate FIVE TIMES, including one time nearly all the way across SeaTac. After we were delayed for 3+ hours, they did send us (via email) a $12 meal voucher...except you can't find a $12 meal anywhere in that airport, unless you consider a bag of M&M's and a bottle of water a meal. The plane had one problem after another but finally took off 4.5 hours late. This caused us to miss our hotel shuttle at ORD (they didn't run past midnight and it was 3 am) so we had to wait 25 minutes and pay for an Uber. I did get a $50 flight voucher from Alaska...big deal. Barely covers my Uber ride that I shouldn't have needed.

For a 5hrs flight a simple meal should provided instead of snacks only

I upgraded to a better seat and it was much more comfortable. Nobody serves food anymore and actually on a 2+ hr flight not necessary. I didn’t even get water.

Missoula is a great airport. Desk and gate crews were very helpful and friendly

Other than delaying take off by an hour, the flight was smooth. Crew were kind and supportive, and made sure we were always considered as a priority.

Not able to get boarding pass for domestic connection flight when check in at international airport. I was told I need to get connection flight boarding pass after I entered US. It us very inconvenient.

Flight was on time. My pre-ordered meal came as expected.

It was good. Too long for older people. Service and support was great! Friendly crew!

I was very impressed at how Alaska Airlines handles people with medical needs.

Only beverages were offered to first class and I thought the flight attendant could have also served the Delta Comfort as well instead of sitting down and staring at her phone and walking past all of us to the back of the plane to charge her phone more. There was a complete lack of turbulence and was safe enough for flights attendant to walk around in the front of the plane, collect trash and serve a few people water and turn off the seat belt light. Also didn’t enforce people putting their seats into the upright position and allowed two passengers to remain reclined during landing. They seemed out to lunch completely. Usually my experience on Delta is much better.

The seats were really comfortable. Flight crew were friendly with passengers. Overall was a great flight.

Arrived early, comfortable seats (Comfort+). Mediocre food, poor wifi (intermittent).

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

Flight was great! This flight from Atlanta was even better than when I paid for Comfort from SNA to Atlanta.

Great crew, flight on time, luggage pick up a breeze

Was on time, normal boarding. The worst flight attendents and service I ever seen,, can't believe Delta can have such service. Bathroom was dirty and no toilet paper, paper towels and used toilet paper all over the floor, when I tried to tell flight attendant she didn't even let me to finish and turn around. Very rude. Wi fi didn't work.

Connection flights should be spaced out farther because too close I missed my connection.

Definitely a southern flavor. Cordiality was evident even though no drinks or snacks were served.

On time! There were plenty of airport employees who were able to keep us moving in the right direction. The crew on the plane were professional.

Boarded early, left early, arrived 40 mins early! A win win for me!

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

This flight is a quick way to get to Chicago, but a bit expensive.

The clerk at check in for my bags was very rude. My credit card was hacked during my vacation and she told me it was not possible to pay in cash for my bag. “You bought the cheapest ticket, you should have bought a ticket that included a bag. If you cannot pay with a credit card, we will not let you on this flight”. She spoke to her supervisor and then told me , I could ask other passengers, if they would use their credit card to check my bag. I had to beg 5 different people, till one agreed to use their credit card. I payed them cash of course. This was a very stressful and humiliating experience for me. I strongly suggest you build in some kind of provision for travelers who got robbed.

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Flight crew was super friendly and helpful. Food was frequent and honestly pretty good. Plenty of on-board entertainment. Economy seats are super cramped for such a long flight, but the crew allowed people to get up and stretch, and kids could wander with their parents, so we all made it work. Overall a very good experience.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Starlink is great Crew was polite Business class didn’t get a welcome drink just water and snacks were ok

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

very average service no complimentary alcoholics drinks unlike other airlines such as Porter airlines No decent seats available during check-in time the day before

Everything you need to know for your flight from Seoul to Illinois

Cabin class types available on flights to Illinois

Cabin classes available on flights to Illinois. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.