€308 Find Cheap Flights to Illinois

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 9/3. 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 for flights to Illinois
These are the airlines KAYAK users have selected most often from within our search results for flights to Illinois
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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€355
St. Louis
St. Louis2 stops€571
Chicago
Chicago1 stop€355
St. Louis
St. Louis2 stops€571

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, 5 Feb - Thu, 12 Feb
Scandinavian Airlines Logo
19:05 - 16:45
DUB
-
ORD
27h 40m1 stop
Scandinavian Airlines Logo
19:20 - 18:20
ORD
-
DUB
17h 00m1 stop
€355Scandinavian Airlines
Wed, 4 Feb - Mon, 23 Feb
Scandinavian Airlines Logo
19:05 - 16:45
DUB
-
ORD
27h 40m1 stop
Scandinavian Airlines Logo
19:20 - 18:20
ORD
-
DUB
17h 00m1 stop
€356Scandinavian Airlines
Fri, 16 Jan - Thu, 22 Jan
Multiple Airlines Logo
06:00 - 14:20
ORK
-
ORD
14h 20m1 stop
Multiple Airlines Logo
17:35 - 14:45
ORD
-
ORK
15h 10m2 stops
€454Multiple Airlines
Thu, 29 Jan - Wed, 4 Feb
KLM Logo
13:25 - 14:20
ORK
-
ORD
30h 55m1 stop
KLM Logo
16:25 - 12:55
ORD
-
ORK
14h 30m1 stop
€459KLM
Fri, 16 Jan - Thu, 22 Jan
Multiple Airlines Logo
06:00 - 17:37
ORK
-
MDW
17h 37m2 stops
Multiple Airlines Logo
18:35 - 14:45
MDW
-
ORK
14h 10m2 stops
€459Multiple Airlines
Thu, 29 Jan - Wed, 4 Feb
KLM Logo
06:00 - 16:38
ORK
-
ORD
16h 38m2 stops
KLM Logo
14:25 - 12:55
ORD
-
ORK
16h 30m2 stops
€464KLM
Thu, 19 Feb - Thu, 26 Feb
British Airways Logo
20:05 - 15:25
SNN
-
ORD
25h 20m1 stop
British Airways Logo
18:30 - 11:30
ORD
-
SNN
11h 00m1 stop
€513British Airways
Fri, 20 Feb - Fri, 27 Feb
British Airways Logo
20:05 - 13:50
SNN
-
ORD
23h 45m1 stop
British Airways Logo
13:39 - 11:30
ORD
-
SNN
15h 51m2 stops
€544British Airways
Thu, 22 Jan - Mon, 26 Jan
American Airlines Logo
07:50 - 15:25
SNN
-
ORD
13h 35m1 stop
American Airlines Logo
16:14 - 16:45
ORD
-
SNN
18h 31m2 stops
€573American Airlines
Thu, 22 Jan - Mon, 26 Jan
American Airlines Logo
07:50 - 15:25
SNN
-
ORD
13h 35m1 stop
American Airlines Logo
18:45 - 11:30
ORD
-
SNN
10h 45m1 stop
€574American Airlines
Booking Insights

KAYAK's insights & trends for flights to Illinois

Get data-powered insights and trends for 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 72 hours.

The cheapest ticket to Illinois from Ireland found in the last 72 hours was to Chicago O'Hare Intl Airport, at €459 return. The most popular route is Dublin (DUB) to Chicago O'Hare Intl Airport (ORD) and the cheapest return airline ticket found on this route in the last 72 hours was €459.

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 €606 on average. The cheapest price found on KAYAK in the last 2 weeks was €230 for the route Dublin (DUB) to Chicago O'Hare Intl Airport (ORD). The most popular routes on KAYAK are Dublin to Chicago which costs €689 on average, and Shannon to Chicago, which costs €739 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 November, when tickets cost €406 (return) on average. On the other hand, the most expensive months are July and June, when the average cost of round-trip tickets is €658 and €582 respectively.

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 30% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 15 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 €487.

Good to know

Low seasonJanuary
Cheapest flight€308
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly (2% more expensive 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 Wednesday when return tickets can be as cheap as €639. On the other hand, the most expensive day to fly is Tuesday, when return prices are €720 on average.

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

    The cheapest time of day to fly to Illinois is generally in the evening, when retur flights cost €592 on average. Morning departures are around 14% more expensive than evening flights, 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 €673.

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 Dublin €463, from Shannon €548
  • 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.
7.4
United AirlinesOverall score based on 9138 reviews
7.7Boarding
6.6Food
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

10.0 ExcellentDr. Joseph, Jan 2026
EWR - ORD
Read more United Airlines reviews

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

The staff was nice, however boarding taking 2 hours. That’s insane. Overall very bad experience, a lot of turbulence and when landed in Chicago was horrible. I don’t think I’ll flight with UA again.

An international flight on an apron is pretty unusual in my 40 years of traveling. Departure delay. Luggage despite over an hour connection did not make it to the flight. Actually still in Germany. My luggage was not moved until I reached my final destination despite knowing it to be left in Germany upon my arrival in Chicago. The service left me a little off, both going and returning from Europe. Light on in the cabin even during a night flight and lots of traffic no matter what. Maybe passengers want more service? As a frequent traveler i just want to be able to sleep, the food will be better at the destination anyway. So since the cabin crew woke me up I asked for a cocktail, I did not get the best response although sitting in row 20 premium economy. I usually fly premium economy or business and my 2 flight to Europe in 2025 with United both had luggage delays and other minor issues. American flights to Australia, Canada and Europe went smoothly and Premium plus feels very much like business light. Is United Club becoming a waste and Silver/Gold levels another waste??

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

Flight, food and crew were all good, friendly and very satisfactory.

Terrible. Flight delayed for more than 8 hours with only a $12 meal voucher provided for the inconvenience. The airplane did not have breaks on arrival yet they still made us go through the motions and board on time knowing we could not take off then sit for 40+ minutes before having to get of the time. A complete waste of my time. I cannot believe they can stay business with these shenanigans. I’ll avoid this company like the plague moving forward as the lack of accountability is disgraceful.

This was the best 2 flights I have had with American out of SGF. Great crew both flights.

Premium economy seat was decent. As always poor headphones, poor food and beverage, crew is not overly friendly

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

Like - the crew were nice Dislike - sitting on the tarmac for long periods after boarding and landing.

I was not admitted to the flight!!! i need a refund for this.

It’s my new favourite airline! Everything was smooth and relaxed!

One of the best flights I've been on in a while. Very genuinely friendly staff. Courteous, kind, respectful. On a past flight (not Aer Lingus) I remember being woken up rudely to put my seat forward. Like a child being berated for something. Oddly jarring experience when someone could just tap you gently on the shoulder and gesture kindly. But I noticed the Aer Lingus staff were incredibly patient with everyone on the plane. It's the holiday season and I noticed a lot more elderly customers on the plane than I typically see flying, and the staff went above and beyond with helping accommodate people. Service throughout the flight was flawless. They came through offering water, and picking up garbage at perfect intervals. Seemed like this flight, everyone was on point. And the flight landed early on top of that

Seats are small, but comfortable and more space around you, so for a normal person the seats are perfect. If you are a big and fat individual, I would not think the seats are comfortable. All else was good and normal. Lots of movies to watch.

Customer service was excellent! The app was terrible, tried several times to check in without success! But the young lady that checked us in was absolutely terrific and helpful.

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

Experience was great overall. However, the connection time between my flights (1hr 15 mins) was too short. We had to get through security check and US immigration in that time, and I made it to the gate just as they were announcing it was about to close. Flights with such a short connection time should maybe not be offered for purchase, or an advance alert would be helpful. Other than that the in-flight experience was excellent, especially the food. Many thanks!

The seats needs to be comfortables, at least please add more padding to the seats.

Food - Non-Existent. You pay for everything. It is strictly Pay-to-Play!

Again, we paid $ 328.00 for specific seats are were assigned those seats.

Having been prepared for paying for everything on board other than water, coffee and tea the service was OK. Food and drink is expensive but the food was OK if limited in scope. Plane was clean and obviously well serviced. After complaining about having to walk in wind and rain to a get a bus to the airport the same thing happened at Portland. I’m sure you could get a terminal gate flight, complimentary food and drink for not much more money without traipsing through rain and slush in Reykjavik. Not bad but not great.

Iceland air transfer was bad. They lost my luggage and I just received it 11/1

The boarding process seem to take longer than necessary, resulting in a 20+ minute delay

It was too cold in the plane my feet froze

Seat was hard and uncomfortable and the temperature too warm and uncomfortable.

No meals included on this long international flight. Most airlines will offer you a meal when flying internationally. Not Icelandair. Your included choices are water and coffee. Poor customer service. The airport was also very confusing.

Best smelling onboard bathrooms ever. Even after use the whole flight. Biggest overhead bins. Most legroom in economy class. Great Icelandiic music. Really nice staff. Icelandair is awesome! (Don’t fly Air Canada! During the strike they lied about no flights available (I booked this flight myself) and hid the process to get money back on their website by obscuring menu titles, then made it difficult and time consuming to fill out. I’m Canadian. Don’t trust Air Canada!

It was good. The air plane is clean and staff were friendly.

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

Great seat in premium economy, great food and drinks throughout lots of in flight entertainment. 1 hour 40 min delayed flying out , 2 1/2 hour wait at passport control in tampa

Plane was extremely delayed, but not all of it was BA fault (some was). Worst part was lack of room - this had as much space as an Allegiant flight. I thought transatlantic usually gave you an extra inch or two, but not this one. Entertainment system sporadically worked and didn’t have great options. Overhead bins are old and tiny, not as good as aunties new planes.

My seat cushion was poor. The cushion was compressed and was uncomfortable for such a long flight.

Besides having a LONG layover in Philadelphia to begin with, our flight was delayed and left late. We spent 7 hours in the Philadelphia airport after being in the air 7 hours from Portugal to Philly. It turned into a 24 hour day of travel which was exhausting. I know you can't help weather but our layover was difficult as my husband is handicapped. The staff was EXTREMELY helpful with his wheelchair tho!!

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.