How does KAYAK find such low prices on flights from Illinois to London?

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 London. Visit our flight page for the latest deals!>/a>

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

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

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to London?

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 to London from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

£135 CHEAP FLIGHTS from Illinois to London

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Cheap Flights from Illinois to London

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

Round-trip

One-way

Last minute

Direct

Recent return flight deals from Illinois to London

Mon, 18 Aug - Tue, 26 Aug

10:27 - 06:55ORD-LGW

14h 28m1 stop

14:00 - 22:22LGW-ORD

14h 22m1 stop

£320

Find Deal

Fri, 16 Jan - Sun, 18 Jan

19:20 - 16:25ORD-LHR

15h 05m2 stops

10:20 - 16:55LHR-ORD

12h 35m1 stop

£322Scandinavian Airlines

Find Deal

Tue, 23 Sep - Tue, 30 Sep

18:00 - 08:20ORD-LHR

8h 20mdirect

06:50 - 12:05LHR-ORD

11h 15m1 stop

£355Lufthansa

Find Deal

Sun, 10 Aug - Tue, 19 Aug

15:45 - 09:05ORD-LHR

11h 20m1 stop

08:50 - 14:00LHR-ORD

11h 10m1 stop

£357Aer Lingus

Find Deal

Sun, 10 Aug - Fri, 29 Aug

15:45 - 08:00ORD-LHR

10h 15m1 stop

13:25 - 19:00LHR-ORD

11h 35m1 stop

£358Aer Lingus

Find Deal

Sun, 14 Sep - Tue, 30 Sep

13:30 - 09:35STL-LHR

14h 05m1 stop

06:50 - 15:18LHR-STL

14h 28m2 stops

£360Air Canada

Find Deal

Sun, 10 Aug - Thu, 28 Aug

10:40 - 10:00ORD-LHR

17h 20m1 stop

06:50 - 14:55LHR-ORD

14h 05m2 stops

£362Air Canada

Find Deal

Tue, 23 Sep - Tue, 30 Sep

16:00 - 06:20ORD-LHR

8h 20mdirect

14:10 - 17:20LHR-ORD

9h 10mdirect

£363Lufthansa

Find Deal

Sun, 10 Aug - Tue, 19 Aug

19:21 - 13:10MDW-LHR

11h 49m1 stop

13:05 - 21:44LHR-MDW

14h 39m1 stop

£364Virgin Atlantic

Find Deal

Sun, 10 Aug - Tue, 19 Aug

19:21 - 13:10MDW-LHR

11h 49m1 stop

13:05 - 21:44LHR-MDW

14h 39m1 stop

£388Virgin Atlantic

Find Deal

Useful Info

Low season	February
High season	March
Cheapest flight	£135

Best time to beat the crowds (11% less expensive on average)

Most popular time to fly and prices are also 19% lower on average.

Flight from Chicago to London Gatwick Airport

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.

How does KAYAK find such low prices on flights from Illinois to London?
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 London.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to London?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from 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 Illinois to London?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to London?
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 to London from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Gatwick

Milton Keynes

Eastbourne

Luton

Southend-on-Sea

Slough

Winchester

Croydon

Stansted

Folkestone

Chichester

Maidstone

Colchester

Chelmsford

Crawley

Bedford

Hastings

Watford

Basingstoke

Royal Tunbridge Wells

Everything you need to know for your flight to London

Cabin class

Complete your trip

Direct flights

Flights to other cities

Origins

Other airports

Return flight deals

Cabin class types available on flights to Illinois

First Class flights to Londonfrom £4,036

Business Class flights to Londonfrom £2,787

Prem Econ Class flights to Londonfrom £4,079

Economy class flights to Londonfrom £402

Not what you’re looking for? Find thousands of other hotels, flights, car hires and package deals with KAYAK.

£135 Find Cheap Flights from Illinois to London

KAYAK searches hundreds of travel sites at once for deals on flights to London

Cheap Flights from Illinois to London

Recent return flight deals from Illinois to London

Recent one-way flight deals from Illinois to London

Recent last minute flight deals from Illinois to London

Recent direct flight deals from Illinois to London

Good to know - Cheap tickets from Illinois to London

Flights from Illinois to London: the best tips from KAYAK users

FAQs for booking flights from Illinois to London

How does KAYAK find such low prices on flights from Illinois to London?

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 London.

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

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

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to London?

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

Travelling to a place near London?

Everything you need to know for your flight to London

Cabin class types available on flights to Illinois

Complete your trip to London with a hotel stay or car hire

Find direct flights for London

Flights to other popular destinations

Flights from domestic origins to London

Choose which airport to fly into in London

Find deals for your return flight