£281 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 the United Kingdom to Illinois departing on 20/10. 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.
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Cheap Flights to Illinois

Cheapest return prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago2 stops£420
Moline
Moline2 stops£808
Chicago
Chicago2 stops£420
Moline
Moline2 stops£808

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, 10 Sep - Mon, 21 Sep
Multiple Airlines Logo
15:10 - 18:15EDI  Edinburgh Turnhouse-ORD Chicago O'Hare Intl
33h 05m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl
Multiple Airlines Logo
19:25 - 00:35ORD  Chicago O'Hare Intl-EDI Edinburgh Turnhouse
23h 10m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen
£420Multiple Airlines
Sat, 5 Sep - Sat, 5 Sep
Multiple Airlines Logo
11:30 - 14:05EDI  Edinburgh Turnhouse-ORD Chicago O'Hare Intl
8h 35mdirect
Multiple Airlines Logo
20:40 - 07:20ORD  Chicago O'Hare Intl-EDI Edinburgh Turnhouse
28h 40m1 stop Toronto Pearson Intl
£433Multiple Airlines
Fri, 11 Sep - Fri, 11 Sep
Austrian Airlines Logo
12:15 - 18:37LHR  London Heathrow-ORD Chicago O'Hare Intl
12h 22m1 stop Washington, D.C. Dulles Intl
Austrian Airlines Logo
21:30 - 11:55ORD  Chicago O'Hare Intl-LHR London Heathrow
8h 25mdirect
£479Austrian Airlines
Tue, 22 Sep - Sun, 27 Sep
TAP AIR PORTUGAL Logo
16:25 - 16:00LGW  London Gatwick-ORD Chicago O'Hare Intl
29h 35m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
18:00 - 09:45ORD  Chicago O'Hare Intl-LGW London Gatwick
33h 45m1 stop Lisbon Humberto Delgado
£480TAP AIR PORTUGAL
Wed, 14 Oct - Wed, 21 Oct
TAP AIR PORTUGAL Logo
16:25 - 12:40LGW  London Gatwick-ORD Chicago O'Hare Intl
26h 15m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
18:00 - 09:45ORD  Chicago O'Hare Intl-LGW London Gatwick
33h 45m1 stop Lisbon Humberto Delgado
£480TAP AIR PORTUGAL
Sun, 30 Aug - Mon, 2 Nov
Icelandair Logo
13:05 - 21:25LHR  London Heathrow-ORD Chicago O'Hare Intl
14h 20m1 stop Reykjavik Keflavik Intl
Icelandair Logo
18:30 - 19:30ORD  Chicago O'Hare Intl-LHR London Heathrow
19h 00m1 stop Reykjavik Keflavik Intl
£481Icelandair
Wed, 7 Oct - Wed, 14 Oct
Icelandair Logo
15:40 - 21:25LGW  London Gatwick-ORD Chicago O'Hare Intl
11h 45m1 stop Reykjavik Keflavik Intl
Icelandair Logo
22:25 - 14:40ORD  Chicago O'Hare Intl-LGW London Gatwick
10h 15m1 stop Reykjavik Keflavik Intl
£482Icelandair
Tue, 22 Sep - Tue, 22 Sep
Austrian Airlines Logo
12:15 - 18:37LHR  London Heathrow-ORD Chicago O'Hare Intl
12h 22m1 stop Washington, D.C. Dulles Intl
Austrian Airlines Logo
21:30 - 11:55ORD  Chicago O'Hare Intl-LHR London Heathrow
8h 25mdirect
£482Austrian Airlines
Wed, 2 Sep - Tue, 8 Sep
Aer Lingus Logo
07:40 - 14:00LHR  London Heathrow-ORD Chicago O'Hare Intl
12h 20m1 stop Dublin
Aer Lingus Logo
21:00 - 15:00ORD  Chicago O'Hare Intl-LHR London Heathrow
12h 00m1 stop Dublin
£487Aer Lingus
Tue, 8 Sep - Tue, 8 Sep
Aer Lingus Logo
07:40 - 14:00LHR  London Heathrow-ORD Chicago O'Hare Intl
12h 20m1 stop Dublin
Aer Lingus Logo
21:00 - 15:00ORD  Chicago O'Hare Intl-LHR London Heathrow
12h 00m1 stop Dublin
£491Aer Lingus
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 the United Kingdom found in the last 5 days was to Chicago O'Hare Intl Airport, at £380 return. The most popular route is Edinburgh (EDI) to Chicago O'Hare Intl Airport (ORD) and the cheapest return ticket found on this route in the last 5 days was £380.

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 £813 on average. The cheapest price found on KAYAK in the last 2 weeks was £380 for the route Edinburgh (EDI) to Chicago O'Hare Intl Airport (ORD). The most popular routes on KAYAK are Edinburgh to Chicago which costs £970 on average, and London to Chicago, which costs £785 on average.

See prices from:

What is the cheapest month to fly from the United Kingdom to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from the United Kingdom 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 the United Kingdom to Illinois is September, when tickets cost £468 (return) on average. On the other hand, the most expensive months are August and July, when the average cost of round-trip tickets is £643 and £572 respectively.

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

The average price for all round-trip flights from the United Kingdom 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 afternoon, when retur flights cost £657 on average. Morning departures are around 1% 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 £689.

How far in advance should I book a flight from the United Kingdom 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 the United Kingdom to Illinois, you should book around 4 weeks before departure, which saves you about 16% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 17 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 £845.

Good to know - Cheap tickets to Illinois

Low season

January

Cheapest flight

£281
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly and prices are also 8% lower on average.
Flight from Edinburgh to Chicago O'Hare Airport

Flights to Illinois: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew to Illinois 
Verified travelerFlew with British Airways-Apr 2025
Make sure to allow ample time between connecting flights. I have to hoof it when I realized that TSA required bags to be picked up and rechecked.
MichaelFlew with British Airways-Apr 2025
Have a light luggage as much as you can. Boarding gate walk is not a joke.

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from the United Kingdom 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 the United Kingdom to Illinois.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from the United Kingdom 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 the United Kingdom 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 the United Kingdom 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 the United Kingdom 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 the United Kingdom 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 £679. On the other hand, the most expensive day to fly is Sunday, when return prices are £720 on average.

Top tips for finding cheap flights to Illinois

  • Looking for cheap airfare to Illinois? 25% of our users found round-trip tickets to Illinois for the following prices or less: Cheap flights to Illinois from Edinburgh £1,302
  • 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 the United Kingdom 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 the United Kingdom 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 10090 reviews
7.3Comfort
8.1Crew
7.1Entertainment
6.7Food
7.7Boarding
Airline reviews

Like the fact that the boarding was expedited. But the delay and chaos around the onboarding was not appreciated.

2.0 MediocreDarly, Aug 2026
Read more United Airlines reviews

Like the fact that the boarding was expedited. But the delay and chaos around the onboarding was not appreciated.

Seats are complete BS for 10 hrs. The guy at counter canceled our return flight from europe. Lufthansa on the way back made United look like a trailer park gathering. If given the opportunity, I will never fly united again. Lufthansa seats werent much better to be fair but the service was a 10 out of 10. Incant express how difficult umited made my trip.

It was a great experience to fly with ANA, the sit is very comfortable.

The flight crew were very helpful. The seats were very close together. There was barely room to sit without touching the person next to you.

I’m an EP on AA every year for more than a decade but this was a very pleasant and surprising experience. Clean and sizable plane for HOU to CHI. 5 row first class. And excellent food in first class the steak option was really good. Your flight attendants even better. Seat 5A

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.

United has come a long way, it’s been a fantastic experience traveling with them.

Late start, late arrival and very uncomfortable seating. If they schedule a takeoff at a specific time, how can they not know the traffic at the airport will be heavy and delay flights at that time? I paid for legroom but when seated next to an oversized person, I had no elbow room. Also, who wants to rub hips with a large stranger for over 2 hours? I ended up leaning toward the aisle the entire flight and being bumped every time someone passed by. Paying for legroom should include side-to-side space, too. This happened on both domestic flights I had within the past 2 weeks.

Very comfortable flight. Great service, food options, and entertainment options. With Wi-Fi!

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 was pleasantly surprised and enjoyed the services of the airline since flying is not my favorite thing. My goal was to be with my brother's family in Manchester after his death. All staff was helpful, the food appreciated since I selected an overnight flight. Every aspect of the experience was comforting. I plan to return to Manchester in order to attend my brother's funeral in October and hope that I am able to find a reasonable priced flight. Thank you

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.

How can the airline deploy the oldest 757-200 with a broken down entertainment system and no WiFi for a cross Atlantic 7:50 hr torture chamber experience?? My seat 3A couldn’t be reclined. The footrest was flimsy and useless. And there’s no leg support unlike their newer 737-Max which they lavish on intra-Europe routes. Shame!!

Only drinks included in economy class was water and coffee seat on the 737 were hard as rock. The landing and passport control in Iceland are the worst I have ever seen. 2 hours to clear customs ???? 3 attendants at pass port control out of more than a dozen closed. I” ll never fly to Iceland or transfer through this airport again.

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.

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.

I will never want to book with these people. They are arrogant and rude. Food was really really bad, crew was even worst

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

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

Unfortunately, my flight was cancelled because of some sort of emergency over the Atlantic and had to return to London. While I think British Airways made every effort to mitigate the situation, I must say it was still pretty unpleasant. I do appreciate the fact, however, that British Airways put my safety first…and I think the effort to correct a bad situation was very sincere. But I think the process might be handled better in future.

The seat pads are past there sell by date now and are uncomfotable. Also, with screens in the back of the seat, the seats shouldnt be able to recline as this puts rhe screen in your face.

As I have said it sucked, the ticket counter to have to find and pay for another airline to get home. Now I understand this happened over the weekend but they should have someone there to talk to us instead of throwing the regular crew under the bus.

Not so good with their baggage handling as they damaged one of my check in luggage

This flight from London to Chicago was actually on an AA airline. I did book through BA but the flight was AA. Great flight, hectic in Chicago, I wouldn't choose to fly through Chicago again, but that's not the airlines fault. The flight itself was great.

Seats were way too small. I got claustrophobic waiting for trash from meal to be taken away. I couldn't move to even close my tray until trash was taken.

The whole experience was very disappointing. Drinks could have been served and offered more frequently. The seats were reasonable but considering I paid for premium economy, I felt cheated. I flew premium economy with Japanese Airlines ANA 5 years ago and their service was by far, superior. We had access to the club lounge, better seats and excellent service. Out of 10, I would rate the experience as 4. Everything felt cheap and the Airbus aircraft are far better and more comfortable

Everything you need to know for your flight to Illinois