€324 Find Cheap Flights 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 Ireland to Illinois departing on 28/9. 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

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Flight Deals

Best Illinois Flight Deals

Cheapest return prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop€535
St. Louis
St. Louis2 stops€760
Chicago
Chicago1 stop€535
St. Louis
St. Louis2 stops€760

Book Cheap Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights 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 return flight deals to Illinois

Thu, 3 Sep - Mon, 7 Sep
Delta Logo
06:15 - 14:15
ORK
-
ORD
14h 00m
1 stop
Delta Logo
15:20 - 14:40
ORD
-
ORK
17h 20m
2 stops
€535Delta
Thu, 3 Sep - Mon, 7 Sep
Delta Logo
06:15 - 14:15
ORK
-
ORD
14h 00m
1 stop
Delta Logo
17:20 - 14:40
ORD
-
ORK
15h 20m
2 stops
€536Delta
Thu, 3 Sep - Mon, 7 Sep
KLM Logo
06:15 - 14:15
ORK
-
ORD
14h 00m
1 stop
KLM Logo
17:10 - 14:40
ORD
-
ORK
15h 30m
1 stop
€536KLM
Thu, 3 Sep - Sat, 12 Sep
KLM Logo
06:15 - 14:15
ORK
-
ORD
14h 00m
1 stop
KLM Logo
17:10 - 14:25
ORD
-
ORK
15h 15m
1 stop
€537KLM
Thu, 3 Sep - Mon, 7 Sep
Delta Logo
10:50 - 20:30
ORK
-
ORD
15h 40m
2 stops
Delta Logo
15:20 - 14:40
ORD
-
ORK
17h 20m
2 stops
€539Delta
Thu, 27 Aug - Sat, 5 Sep
Finnair Logo
09:30 - 11:30
DUB
-
ORD
8h 00mdirect
Finnair Logo
22:20 - 11:50
ORD
-
DUB
7h 30mdirect
€544Finnair
Thu, 27 Aug - Sat, 5 Sep
Finnair Logo
09:40 - 17:50
DUB
-
ORD
14h 10m
1 stop
Finnair Logo
22:20 - 11:50
ORD
-
DUB
7h 30mdirect
€545Finnair
Wed, 2 Sep - Tue, 8 Sep
Aer Lingus Logo
16:45 - 19:15
DUB
-
ORD
8h 30mdirect
Aer Lingus Logo
15:45 - 05:10
ORD
-
DUB
7h 25mdirect
€547Aer Lingus
Fri, 18 Dec - Fri, 8 Jan
Lufthansa Logo
05:10 - 13:45
DUB
-
STL
14h 35m
1 stop
Lufthansa Logo
13:08 - 08:10
STL
-
DUB
13h 02m
1 stop
€912Lufthansa
Tue, 8 Sep - Tue, 15 Sep
Iberia Logo
12:40 - 20:26
DUB
-
STL
13h 46m
1 stop
Iberia Logo
15:34 - 09:45
STL
-
DUB
12h 11m
1 stop
€914Iberia
Booking Insights

KAYAK's insights & trends for flights to Illinois

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

What is the cheapest flight to Illinois?

These are the best return prices found by users searching on KAYAK in the last 5 days.

The cheapest ticket to Illinois from Ireland found in the last 5 days was to Chicago O'Hare Intl Airport, at €539 return. The most popular route is Dublin (DUB) to Chicago O'Hare Intl Airport (ORD) and the cheapest return ticket found on this route in the last 5 days was €539.

How much is a flight to Illinois?

The average and cheapest price for all round-trip flights to Illinois from each origin found by users searching on KAYAK in the last month.

A flight to Illinois costs €906 on average. The cheapest price found on KAYAK in the last 2 weeks was €494 for the route Dublin (DUB) to Chicago O'Hare Intl Airport (ORD). The most popular routes on KAYAK are Dublin to Chicago which costs €792 on average, and Shannon to Chicago, which costs €1,072 on average.

See prices from:

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ireland 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 Ireland to Illinois is February, when tickets cost €430 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is €660 and €614 respectively.

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

The average price for all round-trip flights from Ireland 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 evening, when retur flights cost €617 on average. Morning departures are around 16% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the afternoon, which is peak travel time and where the average cost of a ticket is €809.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights 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 a flight from Ireland to Illinois, you should book around 3 weeks before departure, which saves you about 34% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Which is the cheapest airport to fly into in Illinois?

Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in Illinois is Chicago O'Hare Intl Airport (ORD), with an average flight price of €957.

Good to know

Low season

January

Cheapest flight

€324
Best time to beat the crowds (6% less expensive on average)
Most popular time to fly and prices are also 9% lower on average.
Flight from Shannon to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Ireland 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 Ireland to Illinois.

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

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

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from Ireland 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 Ireland 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 Ireland to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest day to fly to Illinois?

    Based on KAYAK data, the cheapest day to fly to Illinois is Thursday when return tickets can be as cheap as €668. On the other hand, the most expensive day to fly is Monday, when return prices are €830 on average.

Top tips for finding cheap flights to Illinois

  • Looking for cheap airfare to Illinois? 25% of our users found return tickets to Illinois for the following prices or less: From Shannon €903, from Dublin €1,101
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Illinois flight deals.

Reviews of the top 5 airlines flying to Illinois

 
See real verified KAYAK customer reviews for airlines flying to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Ireland to Illinois. 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 Ireland 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.
7.6
FinnairOverall score based on 1423 reviews
6.7Food
7.4Comfort
8.2Crew
7.7Boarding
6.9Entertainment
Airline reviews

The food was delicious. There has been a major improvement here in the last few years. Excellent, friendly service. An enjoyable experience.

10.0 ExcellentMatti, Jul 2026
HEL - JFK
Read more Finnair reviews

The food was delicious. There has been a major improvement here in the last few years. Excellent, friendly service. An enjoyable experience.

Awful. Delayed for unknown reason. Boarded late, part of a Tight connection ands had to go through customs and immigration. And they lost my bags.

Late, dirty cabin, charging ports broken, uncomfortable, no tomato juice, barely edible food

Flight on time, landed well ahead of schedule. Attendants were excellent and responsive

The crew was friendly, and the flight landed on time

Rude Iberia security crew at the Madrid terminal. No Iberia officials to be found to redress complaints at the gate. No supervisors. Nothing for processing upgrades at the gate Iberia app did not work to let me upgrade my options to higher classes. No water was offered on a hot day in Madrid. Madrid airport air conditioning was so weak that people were sweating. Never book on any airlines that codeshare with Iberia.

Great if not for the boarding by bus at Heathrow terminal 3. Medieval disappointing time-consuming and very hard on handicapped flyers. It was awful

Do not use KAYAK or Finair for future travel. Unless you purchase the tickets directly from the airline, you were going to have a difficult time checking in. Kayak canceled my flights twice and ended up causing great difficulty in me getting back from Europe because they double sold my tickets between American Airlines and Finair. The event caused significant delays and led to me having to rebook my flights.

It was listed on my ticket as Finnair but there was no indication that the flight was Finnair. In fact the number was even different. There were no employees there until exactly 2 hours before so we had to wait in line at Iberia and hope

Flight were delayed which made me miss all the other flights. Bags are still missing from 2 weeks ago. This airline is worse the Spirit Airlines!

Gluten free snack options and meals that offer both gluten free and dairy free.

Not a bad flight but a long delay boarding and taking off due to the pilot not arriving on time.

I would have preferred a flight voucher and to hop on a different flight. Delayed over 6 hours.

I almost missed my connection in Chicago due to having to wait on a gate to be open I am assuming. Having to run from E terminal to C terminal and I barely made it there before they closed the door. This may not be the actual airline's fault it's crazy how there is so little time between flight especially when they are placed so far apart in the airport.

The Wi-Fi did not work, so you weren't able to watch entertainment on your own device. They did not have wired headphones so you couldn't watch it on the in-seat entertainment screen either. There was plenty of time to do a drink and snag service but the flight attendants chose not to.

Great experience, boarding was fast and efficient, so much so that we arrived to Chicago very early

The flight did not have its customary snacks during the flight. Apparently they were never loaded on the plane.

The seats on this flight weren’t as comfortable as we had expected. Even leaned back these seats left us feeling crappy in our backs. Also we had to use our own tablets for movies, but nothing in the seats in front of us to hold the tablets up.

The head rest is too big and cannot be placed differently/removed. Causes one head to tilt forward and increase back pain

Food was not great. Small seating area for business class

I was pleasantly surprised. I've never flown this airline and the seats were comfy, I couldn't select my seat but luckily got aisle and was able to comfortably sleep the whole trip except when they came around with an in flight free meal, drinks then snack at the end. I'd fly with Aer Lingus again. The only annoying thing is you had to pay for WiFi for different hours of usage but luckily I didn't need it

This was a great flight. I love the way they had general boarding board from the back first by seat row and in general the flight was very comfortable. The seats were actually comfy, and the food served was surprisingly good.

Small plane. Tight seating . What can one say except that it was fast!

The flights are literally always delayed arriving, boarding and taking off so they are always late for the connection. I planned ahead so I was okay but many others aren't. The food was terrible. The staff was very pleasant. I appreciate boarding back to front.

All aspects were excellent - it helped that the flight was only 2/3 full and I had no one sitting in my row. The Pre-check (US Passport Control and Customs) in Dublin made everything so easy when we arrived in Chicago.

Very nice experience. Flight had good entertainment system and good food options. Customer service was very friendly and nice as well.

The same as I stated prior. We incurred extra costs that should be reimbursed, given we were not communicated with about schedule changes.

My flight from Dublin was delayed two hours which ment that I missed my connecting flight to Phoenix. American Airlines provided a hotel room and rebooked my flight for 7:30 AM the next day. I didn't get to the room until 11 pm and I had to be at the airport the next day by 5 AM. The airlines did their best but the schedule was challenging for an 81 year old.

I like Aer Lingus so that is why I’m writing this critique so they can become better. The boarding gate was too small to board properly. Our seats were toward the back of the plane knowing we would be boarding after business class, we moved to that area after business class boarded. An Aer Lingus employee told us we couldn’t stand there. We explained we were the next group to board and wouldn’t even be able to hear when our boarding was called. She didn’t care and was not very professional. The cabin was freezing. I wouldn’t feed my dog the food. We were over an hour late coming into chicago because of weather which can’t be avoided. I asked the crew if they could make an annoucement for before whose final destination is chicago to wait and allow the people with connecting to deplane first. He said there are a lot of people with connecting flights. He said, it doesn’t matter. Well, yes it does. He could have been more considerate of his passengers.

Very pleasant staff, there was some turbulence but the captain was very apologetic and gave notice where possible.

The ticket was reserved in my name but not paid for by underpricer. Alaska airlines was unable to issue my ticket (could not connect the ticket with the PNR) due to an error with underpricer and I spent the better part of 2 hours at the ticket counter trying to rectify.

Terrible way of boarding in Reykjavik. Seats comfortable. Meal was good.

Unlike my prior three connections on this latest journey, this flight was fairly good. Only issue was boarding as it was once again one of those Icelandic issues of bunch up, walk in the rain to a bus that then has you run up three flights of stairs to board the plain. I was in Saga class but the bus scramble eliminates any chance you get on first and have to then find a place to squeeze your carry on into an overhead that the people in economy populate so they can grab it on their way out up front. But unlike other Icelandic flights this journey I did find more the of the business class like accommodations then the other air segments. This one found a pillow and blanket waiting for me and I actually received a small cup of sparkling wine and had a bottle of water in place. Service was attentive and the flight departed and arrived on time. Received a menu and had choices of a hot or cold meal. I choose the hot which was cod and it was good. Decent size portion, salad and a choice of dinner rolls. Beverage menu was a selection of wines, beer and soft drinks. Desert was a small Tiramisu. Overall the six hour flight was a good experience for the price point.

We paid for saga class, which is the business class for international. My seat was broken and did not recline and my monitor for in-flight entertainment was broken.

The flight itself was fine, even with a one-hour delay leaving on the Reykjavik tarmac (the lost time was made up during flight). Our experience at the Reykjavik airport on arrival was terrible due mostly to the one hour it took for passport control. Only two stations were open for our category, and the room was full with a huge crowd.

Awful. The Iceland airport was a complete mess. Boarding was a chaotic, the seats were awful, there was a group of rowdy 20 something men in our row hooting and hollering, ordering alcoholic drink after drink. Yelling and laughing at the top of their lungs and the crew just went along with it. Passengers complained to the men, asking if they could keep it down (it was a night time flight so people wanted to sleep). They never listened crew continued to laugh with them, flirt with them and serve them more drinks. No free food or snacks, seats were horribly uncomfortable. Worst flight I've had in a long time

At least one soda free, felt like I was nickeled to death.

Comfort of seats is not good. Like sitting on a rock for 6 hours. Also no in flight food and limited beverages unless you pay is not nice. Need flight to be dark during the “night” but attendants don’t ask for shades to be lowered..

Good. Lacking overhead bin space. No food offered but you can order online or in flight and pay for snacks.

We had to be bussed to the plane. And it was raining. Not a pleasant experience.

Very comfortable plane. The food was very good (for airplane food). The crew was great

The legroom was lacking and the entertainment system lacked adequate selection of older films. Modern films are generally not very good.

Perfect airline, super friendly, great service, tasty food. Would fly again.

Everything could have been better. What needed to be wrong with United went wrong

It was good. The seats in economy weren’t bad

Very good. Comfortable and I felt well taken care of from start to finish

We were in premium economy seats that appeared to be locked in plae, No reclining. My aching back.

I don’t understand how they charge as much as they do for such a poor experience

I wish the plane had pod seating for business class. I had a window seat (8K) and I had to climb over the person sitting on the aisle when I needed to get up. Also there is no partition between the seats for privacy when sleeping. The Asian airlines have much nicer business class seating. Their seats are wider for better comfort when sleeping.

The seat space seemed small especially when the person ahead reclined but other than that, very good.

Everything you need to know for your flight 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.