$159 Find Cheap Flights from Illinois to the United Kingdom

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Good to know

Low seasonFebruary
High seasonJuly
Cheapest flight$159
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 20% increase in price.
Flight from Chicago O'Hare Airport to London Gatwick Airport

Flights from Illinois to the United Kingdom: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Illinois to the United Kingdom 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with British AirwaysORD-LHRJun 2025
Get a wheel chair if you have difficulty walking
JoeFlew with IberiaORD-LHRApr 2025
Get there early. Nice airport options while you wait.
Verified travelerFlew with IberiaORD-LHRMay 2025
Get to the airport early so you’re relaxed. Con yourself into believing it’s bedtime and try to sleep so that you can keep going all day when you get there. If you can afford more comfy seats it might be worth it - though I always have the cheap ones so I can’t say for sure. Try very hard not to. sit in the middle. I’m small and the guy next to me played games all night and didn’t care that he continually ( with every move) jabbed me with his arm. This was my first flight with Cheap Flights and it was far less convenient than other times I’ve flown overseas.
DinaFlew with United AirlinesORD-LHRJan 2025
Anticipate delays, prepare for long walks through Heathrow to baggage claim or for connections.
KariFlew with British AirwaysORD-LHRMay 2024
Always check to confirm your assistance is in system. No wheelchair waiting for me in London. Had no clue about airport or how to get around. Got lost easy
AaronFlew with American AirlinesORD-LHRDec 2023
Find a flight where you are allowed to choose your seats before the day of boarding for anything international.

FAQs for booking flights from Illinois to the United Kingdom

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

    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 Illinois to the United Kingdom.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Illinois to the United Kingdom 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 Illinois to the United Kingdom?

    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 Illinois to the United Kingdom 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 Illinois to the United Kingdom?

    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 Illinois to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which is the cheapest airport to fly into in the United Kingdom?

    Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in the United Kingdom is Edinburgh Turnhouse Airport (EDI), with an average flight price of $549.

  • What is the cheapest day to fly to the United Kingdom?

    Based on KAYAK data, the cheapest day to fly to the United Kingdom is Wednesday where round-trip tickets can be as cheap as $763. On the other hand, the most expensive day to fly is Saturday, where round-trip prices are $889 on average.

  • What is the cheapest time of day to fly to the United Kingdom?

    The cheapest time of day to fly to the United Kingdom is generally in the morning, when round-trip flights cost $689 on average. Morning departures are around 16% cheaper than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally in the evening, which is peak travel time and where the average cost of a ticket is $823.

  • What is the cheapest flight to the United Kingdom?

    The cheapest ticket to the United Kingdom from Illinois found in the last 72 hours was to London Heathrow Airport, at $598 round-trip. The most popular route is Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR) and the cheapest round-trip airline ticket found on this route in the last 72 hours was $598.

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

    The cheapest month for flights from Illinois to the United Kingdom is January, when tickets cost $560 (return) on average. On the other hand, the most expensive months are May and June, when the average cost of round-trip tickets is $1,214 and $1,012 respectively.

  • How far in advance should I book a flight from Illinois to the United Kingdom?

    To get a below average price on the flight from Illinois to the United Kingdom, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

  • How long is the flight to the United Kingdom?

    An average nonstop flight from Illinois to the United Kingdom takes 12h 21m, covering a distance of 3879 miles. The shortest route is Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR) with an average flight time of 7h 40m.

  • What are the most popular destinations in the United Kingdom?

    Based on KAYAK flight searches, the most popular destination is London (88% of total searches to the United Kingdom). The next most popular destinations are Edinburgh (6%) and Manchester (2%). Searches for flights to Belfast (1%), to Birmingham (1%) and to Inverness (0%) are also popular.

Book cheap flights from Illinois to the United Kingdom

Recent round-trip flight deals

12/6Sat
2 stopsScandinavian Airlines
15h 05mORD-LHR
12/11Thu
2 stopsScandinavian Airlines
29h 15mLHR-ORD
$415
11/7Fri
2 stopsScandinavian Airlines
17h 10mORD-LHR
11/13Thu
2 stopsScandinavian Airlines
15h 40mLHR-ORD
$417
9/22Mon
2 stops
24h 00mORD-STN
9/29Mon
2 stops
16h 35mSTN-ORD
$429
8/5Tue
1 stop
16h 51mORD-LGW
8/26Tue
1 stop
29h 22mLGW-ORD
$438
8/23Sat
1 stopIcelandair
10h 20mORD-LGW
8/30Sat
1 stopIcelandair
11h 35mLGW-ORD
$459
8/3Sun
1 stopVirgin Atlantic
15h 45mORD-LHR
8/12Tue
1 stopVirgin Atlantic
11h 30mLHR-ORD
$472
8/13Wed
1 stopFinnair
18h 40mORD-LHR
8/28Thu
1 stopFinnair
16h 20mLHR-ORD
$473
8/19Tue
1 stopFinnair
18h 40mORD-LHR
8/27Wed
1 stopFinnair
16h 20mLHR-ORD
$474
8/3Sun
1 stopVirgin Atlantic
15h 45mORD-LHR
8/12Tue
2 stopsVirgin Atlantic
20h 08mLHR-ORD
$476
10/4Sat
1 stopIcelandair
18h 55mORD-LHR
11/4Tue
1 stopIcelandair
26h 45mLHR-ORD
$481

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Recent one-way flight deals

7/30Wed
1 stop
18h 29mORD-LGW
$159
10/1Wed
1 stopIcelandair
10h 30mORD-LHR
$165
8/4Mon
1 stopTAP AIR PORTUGAL
17h 35mORD-LHR
$223
8/4Mon
1 stopTAP AIR PORTUGAL
15h 25mORD-LGW
$224
8/16Sat
1 stopJetBlue
21h 15mORD-LHR
$251
8/6Wed
3 stopsITA Airways
32h 05mORD-LCY
$358
10/15Wed
1 stopBritish Airways
12h 20mORD-GLA
$366
9/21Sun
1 stopBritish Airways
12h 05mORD-GLA
$376
7/17Thu
1 stopJetBlue
20h 59mORD-EDI
$382
7/16Wed
1 stopITA Airways
13h 05mORD-LCY
$384

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Last minute flights from Illinois to the United Kingdom

Last minute flight, train and bus deals

7/15Tue
multi-stopAer Lingus
10h 10mORD-LHR
9/9Tue
multi-stopAer Lingus
11h 35mLHR-ORD
$702
7/14Mon
multi-stopBritish Airways
13h 18mSTL-LHR
7/24Thu
multi-stopBritish Airways
13h 09mLHR-STL
$702
7/14Mon
multi-stopVirgin Atlantic
15h 49mSTL-LHR
7/24Thu
multi-stopVirgin Atlantic
15h 57mLHR-STL
$718
7/15Tue
multi-stopIcelandair
13h 15mORD-LGW
9/9Tue
multi-stopIcelandair
11h 15mLGW-ORD
$723
7/15Tue
multi-stopIcelandair
10h 30mORD-LHR
9/9Tue
multi-stopIcelandair
11h 10mLHR-ORD
$727
7/15Tue
multi-stopIcelandair
10h 25mORD-LGW
9/9Tue
multi-stopIcelandair
11h 15mLGW-ORD
$755
7/11Fri
multi-stopJetBlue
21h 14mORD-LHR
7/27Sun
multi-stopJetBlue
29h 30mLHR-ORD
$779
7/15Tue
nonstopAmerican Airlines
7h 40mORD-LHR
9/9Tue
multi-stopAmerican Airlines
12h 55mLHR-ORD
$805
7/11Fri
multi-stopJetBlue
32h 03mORD-LHR
7/27Sun
multi-stopJetBlue
29h 30mLHR-ORD
$807
7/15Tue
multi-stopVirgin Atlantic
13h 41mMDW-LHR
7/22Tue
multi-stopVirgin Atlantic
16h 47mLHR-MDW
$1,167

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Everything you need to know for your flight to the United Kingdom

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.
First Class flights to the United Kingdomfrom $3,958
Business Class flights to the United Kingdomfrom $2,865
Prem Econ Class flights to the United Kingdomfrom $1,515
Economy Class flights to the United Kingdomfrom $598

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