$255 Find Cheap Flights from the United Kingdom to Illinois

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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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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 round-trip prices found by users searching on KAYAK in the last 72 hours.

The cheapest ticket to Illinois from the United Kingdom found in the last 72 hours was to Chicago O'Hare Intl Airport, at $547 round-trip. The most popular route is Edinburgh (EDI) to Chicago O'Hare Intl Airport (ORD) and the cheapest round-trip airline ticket found on this route in the last 72 hours was $547.

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 November, when tickets cost $474 (return) on average. On the other hand, the most expensive months are August and July, when the average cost of round-trip tickets is $951 and $815 respectively.

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 the flight from the United Kingdom to Illinois, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 13 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 $707.


Good to know

Low seasonMarch
High seasonJuly
Cheapest flight$255
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 16% increase in price.
Flight from London Heathrow Airport to Chicago O'Hare Airport

FAQs for booking flights from the United Kingdom to Illinois

  • 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 travelers 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 round-trip 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 Friday where round-trip tickets can be as cheap as $815. On the other hand, the most expensive day to fly is Sunday, where round-trip prices are $931 on average.

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

    The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $620 on average. Morning departures are around 13% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the evening, which is peak travel time and where the average cost of a ticket is $956.

Reviews of the top 5 airlines serving from the United Kingdom 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 8810 reviews
7.0Entertainment
7.3Comfort
6.6Food
7.7Boarding
8.1Crew
Airline reviews

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

6.0 GoodAnonymous, Jun 2025MLI - ORD
Read more United Airlines reviews

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

I liked that the flight was nonstop from ORD to CIU for $200 round trip.

The schedule to Moline changed 5 times. The gate changed 6 times. That is a pathetic way to run an airline. No wonder that no one in our company flies on United Express to or from Moline. Changes happen most of the time. I learned my lesson on this trip…never again!

All flight attendants could benefit by taking an international flight on Qantas Airline. Qantas attendants are much more hospitable in every way. Much superior than and attendants on any US airline.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

The first flight was better in terms of the aircraft.

So far so good but food and entertainment are not available for this flight

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

Overall poor for me I paid extra for seats with leg room and my regional flights exit row seats have less leg room then the others that's money that could have been saved and on my final flight home the flights air was not operating it was unbearably hot in the cabin I will be contacting United and filing a DOT complaint

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

The flight was 2 hour delayed, otherwise everything was excellent. The delay was due to the hourly limit requirement so given that as a reason, I'm happy with the flight!

Not sure the logic of the boarding in Groups. I was loaded first on the aisle. Then the guy in the middle. Then the guy by the window. Constantly holding up the other people boarding behind them with us blocking the aisle and this happened in most of the other rows

To start, I’d like to say that every American Airline personnel I interacted with on the ground, especially flight crew, was very friendly and did their best to help me out. Despite this, however, my experience with the airline was an entire mess. The 7:19 PM flight was heavily delayed due to weather, and pushed to 10:30 AM the next morning. Because of this, I had to spend the night inside of the airport. At some point later in the night, I got an email saying that the flight had been canceled. I called the support number, and the representative on the other line told me that the flight was still on and that I didn’t need to rebook. The next morning, no one came to the gate to open the door for the crew until almost 11 AM. By this time the flight crew had been waiting for over an hour, and they had called management to get someone to open the door for them multiple times. Around 11:30, the gate screen had changed to a different flight. I ended up buying a last minute ticket with Southwest airline just to get to Chicago, because the next flight with American wasn’t until 7:19 pm that day. Now, earlier that morning my suitcase had been sent ahead of me to ORD. I went to baggage claim to ask them if I could have my suitcase forwarded to where I was staying. The representative at SDF baggage claim said they could and put the claim in for me. As I was going back through TSA, I got an email that the airline had found my suitcase, but the next step was to send it BACK to SDF. I called the airline support number again, and I made it clear that my suitcase needed to stay in Chicago and to not come back to SDF. The representative told me that they would hold my suitcase at ORD and that it wasn’t going to be forwarded anywhere. Once I got there, I found that they had loaded my suitcase onto a plane to send it back to SDF. Thankfully, I had gotten to the baggage claim counter in time for them to put in a request to bring my suitcase back up. My refund with the airline is processing already, but because of this entire experience and miscommunication at every turn of the way, I will not book with American Airlines in the future.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

Crew professional. Easy bag drop off. On time. Good entertainment.

Everything was great. Boarding, early departure, early arrival, and deplaning were smooth. Smooth flight.

Per usual, flight status, staff courtesy and professionalism were excellent

Everything was on time, we arrived early, everything worked well.

The only thing is if Wi-Fi is available after you land and taxi to the gate. It takes forever to get to the gate, and having the Wi-Fi continue would be great to bide the time at least 5 minutes before you arrive at the entrance. That is my only comment; otherwise, everything was good.

One cold drinks service. No snacks with drinks. No tomato juice or apple juice, coke - only fanta or sprite then ran out of that. Went to gally after meal service no one there / no self service for water at least. Waited 25 min for cabin crew to assist. No recycling of cardboard/ plastic - all put to garbage. Breakfast was a nutrigrain bar and an orange juice. Also I'm sure I booked a flight with checked luggage allowance but had to buy extra when I had my booking confirmation. Movies were good. Chairs comfy. Pillow and blanket and ac vents.

I would definitely use a Linus again, the price was right, the service is excellent. No delays. Wish I had a direct flight from my hometown Detroit.

At check-in the unmanned machines said QR code was invalid so had to queue for over an hour to check in bags

i used to fly aer Lingus regularly but due to price - poor seating etc i have been using other carriers - i now have aer lingus in my state and the price is always the highest - i have flown to Ireland 11 times in last 24 months and have not used Hartford because of price

Nicest staff I’ve experienced on a plane! Good food, great entertainment, and they gave out little blankets that my kids loved. All in all, great experience.

The Glasgow to Dublin route was very efficiently boarded, flight and landing and disembarkation were all super smooth. Dublin to JFK flight I was very pleasantly surprised overall. This was my first time on Aer Lingus and having already come off the short regional flight I was curious to know how the international flight would go. Aircraft was solid, entertainment options were better than expected, flight crew were experienced and operated like clockwork. Main entree left a little something to be desired but the snack was very tasty. Boarding and disembarkation again very smooth and pilots got us in earlier than expected. Would definitely fly again

Unfortunately the flight was delayed for 50 min. Just as we were about to board so that was a drag. The boarding was average. The bag check in process was new to us and efficient. And the flight itself was smooth- basically no turbulence.

It was ok not that much because I always travel with Emirates airlines, Etihad, airlines, Qatar airlines compare to them food and comfortable was too low . Staff was good . Helpful

I believe it was short flight in plane I understand not that much compared to other airlines but weighting for checkin was too long need extra person for checkin or Atleast someone to let the customer knows don’t worry someone will be here shortly.

Noted in last review. Good to know, though air Lingus on European flights does not offer any food or drink, even though we were on the plane for 3 1/2 hours from Naples to Dublin everything you had to purchase even water.

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..

Seats in premier saga class were narrow and hard. Very uncomfortable for a 5-hour flight.

Iceland airlines doesn't provide any meal on flight to and from New York, except water and soda. Airline over charge for checking in luggage. I'm really upset.

Iceland airlines doesn't provide any meal on flight to and from New York, except water and soda. Airline over charge for checking in luggage. I'm really upset. If there is option to use another company, I suggest to other people use them.

I had an exit row and so was Comfortable on the long flight.

The seats on this airline are sooo small, even for a petite person. I felt like the seat tilted forward and I was fighting to stay in it. The lavatory is horribly small, with a wet floor because the sink is so small you can't help but splash the water all over when washing up.

For an economy lite experience, it's by far the best I've had. New planes, clean, great destinations. Very happy to have discovered Iceland Air.

Smooth efficient airline. Think they should have their own bag drop as the queue took 30mins to bmscan and drop

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

The flights were in time and the bags arrived. well done

Better synchronizing the boarding processes. The audio announcements, the personnel and the digital signage were not saying the same thing. All confusion.

The first class seats were unusable, mine at the end of the flight, my husband's in the middle of the flight, and the one next to me was unusable either, they had to move the person to another seat.

Last minute gate change. Didn’t put our TSA global on our trip even though we asked multiple times to confirm. Did not help with food when could not eat what was served.

Our luggage didn’t arrive with us, that puts a damper on the whole trip.

The cabin was bit colder than I like but the crew members looked after us very well. They did even offer hot water bottle and hot chocolate. I cannot rate the crew enough excellent is not good enough. They really were wonderful.

Boarding is always a challenge as folks in al groups crowd around for no reason, but crew handled it well. I once again applaud the LHR ground baggage staff as they got our bags from a flight at Terminal 5A to a flight in Terminal 5C within 40 minutes...amazing!

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.

Push back is not working when I complaint a male staff he told me that most of the seats are like that so we can’t do anything

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.

Boarding was fairly chaotic. One of your employees clipped my ankle as he was passing with an empty wheelchair and not only did not apologize but stated something to the effect of “oh forGod’s sake.” There was plenty of room for him to pass. otherwise, everything was excellent.

Book cheap flights from the United Kingdom to Illinois

Recent round-trip flight deals

 
These are the cheapest round-trip flights to Illinois found on KAYAK in the last 72 hours.
11/12Wed
1 stopIcelandair
11h 25mLGW-ORD
11/19Wed
1 stopIcelandair
10h 25mORD-LGW
$426
12/12Fri
1 stopIcelandair
11h 25mLGW-ORD
12/17Wed
1 stopIcelandair
10h 25mORD-LGW
$438
9/27Sat
nonstopUnited Airlines
9h 10mLHR-ORD
9/27Sat
1 stopUnited Airlines
30h 48mORD-LHR
$501
9/19Fri
1 stopBritish Airways
11h 55mLHR-ORD
9/29Mon
nonstopBritish Airways
7h 55mORD-LHR
$515
9/1Mon
1 stopBritish Airways
11h 55mLHR-ORD
9/22Mon
nonstopBritish Airways
7h 35mORD-LHR
$516
11/6Thu
1 stopUnited Airlines
13h 20mLHR-ORD
11/12Wed
nonstopUnited Airlines
8h 10mORD-LHR
$518
8/28Thu
1 stopAmerican Airlines
14h 05mLHR-ORD
3/22Sun
1 stopAmerican Airlines
11h 08mORD-LHR
$566
8/28Thu
1 stopAmerican Airlines
12h 15mLHR-ORD
9/5Fri
1 stopAmerican Airlines
13h 08mORD-LHR
$602
10/8Wed
1 stopAer Lingus
13h 05mEDI-ORD
10/14Tue
1 stopAer Lingus
11h 45mORD-EDI
$631
10/10Fri
1 stopAer Lingus
11h 30mEDI-ORD
10/17Fri
1 stopAer Lingus
16h 35mORD-EDI
$743

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Recent one-way flight deals

 
Only flying one-way? Below are some of the best deals for one-way flights to Illinois found on KAYAK in the last 72 hours.
9/15Mon
2 stops
52h 27mLHR-ORD
$255
9/14Sun
2 stops
36h 27mLTN-ORD
$258
11/19Wed
1 stopIcelandair
11h 25mLGW-ORD
$498
11/1Sat
1 stopIcelandair
11h 25mLGW-ORD
$505
11/13Thu
1 stopAer Lingus
11h 45mLHR-ORD
$518
8/18Mon
1 stopAer Lingus
11h 35mLHR-ORD
$519
8/20Wed
nonstopBritish Airways
8h 40mLHR-ORD
$565
9/13Sat
nonstopBritish Airways
8h 45mLHR-ORD
$576
7/14Mon
1 stopAmerican Airlines
19h 19mLHR-STL
$2,864
7/17Thu
1 stopAmerican Airlines
21h 54mLHR-STL
$2,913

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Last minute flights to Illinois

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights to Illinois that are departing in the next 10 days.
6/23Mon
multi-stop
34h 44mLGW-ORD
7/8Tue
multi-stop
17h 14mORD-LGW
$613
6/23Mon
multi-stop
34h 44mLGW-ORD
7/8Tue
multi-stop
32h 11mORD-LGW
$614
6/23Mon
nonstopBritish Airways
8h 40mLHR-ORD
7/7Mon
multi-stopBritish Airways
10h 35mORD-LHR
$672
6/23Mon
nonstopBritish Airways
8h 40mLHR-ORD
7/8Tue
nonstopBritish Airways
7h 45mORD-LHR
$674
6/23Mon
nonstopAmerican Airlines
8h 40mLHR-ORD
7/6Sun
multi-stopAmerican Airlines
12h 35mORD-LHR
$678
6/23Mon
nonstopAmerican Airlines
8h 30mLHR-ORD
7/8Tue
nonstopAmerican Airlines
8h 05mORD-LHR
$708
6/19Thu
multi-stopIcelandair
14h 10mLHR-ORD
6/25Wed
multi-stopIcelandair
10h 30mORD-LHR
$947
6/19Thu
multi-stopIcelandair
11h 15mLGW-ORD
6/25Wed
multi-stopIcelandair
13h 15mORD-LGW
$948
6/19Thu
multi-stopAer Lingus
12h 30mEDI-ORD
6/24Tue
multi-stopAer Lingus
13h 30mORD-EDI
$1,126
6/20Fri
multi-stopAer Lingus
16h 29mEDI-ORD
6/25Wed
multi-stopAer Lingus
10h 45mORD-EDI
$1,165

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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.

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