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>

£175 CHEAP FLIGHTS from Illinois to London

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Flight Deals

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

Tue, 3 Mar - Wed, 18 Mar

07:00 - 09:20ORD-LHR

20h 20m2 stops

07:05 - 17:45LHR-ORD

15h 40m2 stops

£405Scandinavian Airlines

Find Deal

Sun, 11 Jan - Wed, 4 Feb

10:24 - 16:00ORD-LHR

23h 36m2 stops

10:20 - 16:45LHR-ORD

12h 25m1 stop

£405Scandinavian Airlines

Find Deal

Sun, 30 Nov - Sat, 6 Dec

20:25 - 15:45ORD-LGW

13h 20m1 stop

16:35 - 14:45LGW-ORD

28h 10m1 stop

£406TAP AIR PORTUGAL

Find Deal

Wed, 26 Nov - Wed, 3 Dec

19:20 - 22:40ORD-STN

21h 20m2 stops

18:25 - 16:45STN-ORD

28h 20m2 stops

£407Multiple Airlines

Find Deal

Fri, 28 Nov - Sat, 6 Dec

20:15 - 15:45ORD-LGW

13h 30m1 stop

16:35 - 14:45LGW-ORD

28h 10m1 stop

£408TAP AIR PORTUGAL

Find Deal

Thu, 8 Jan - Tue, 13 Jan

18:30 - 18:05ORD-STN

17h 35m2 stops

16:10 - 17:20STN-ORD

31h 10m2 stops

£408Multiple Airlines

Find Deal

Sun, 9 Nov - Tue, 18 Nov

18:30 - 19:30ORD-LHR

19h 00m1 stop

20:35 - 17:20LHR-ORD

26h 45m1 stop

£408Icelandair

Find Deal

Thu, 29 Jan - Sun, 1 Mar

18:30 - 10:55ORD-LGW

10h 25m1 stop

11:55 - 17:20LGW-ORD

11h 25m1 stop

£408Icelandair

Find Deal

Sun, 9 Nov - Tue, 18 Nov

15:50 - 10:10ORD-LHR

12h 20m1 stop

08:50 - 14:00LHR-ORD

11h 10m1 stop

£416Aer Lingus

Find Deal

Wed, 19 Nov - Wed, 26 Nov

15:50 - 10:10ORD-LHR

12h 20m1 stop

08:50 - 14:00LHR-ORD

11h 10m1 stop

£418Aer Lingus

Find Deal

Cheapest return fare

£405

Overall average: £544

Scandinavian Airlines

Tue 3/3Wed 18/3

ORD - LHR • 2 stops

Cheapest direct flights

£436

Typical prices: £484-£632

Finnair

Tue 11/11Tue 18/11

ORD - LHR • Direct

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KAYAK searches hundreds of sites at once to find you the best travel deals.

We hope you love your trip to London!

Useful Info

Low season	February
High season	March
Cheapest flight	£175

Best time to beat the crowds (22% less expensive on average)

Most popular time to fly and prices are also 13% lower on average.

Flight from Chicago to London Luton 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

Hounslow

Southend-on-Sea

Slough

Croydon

Winchester

Stansted

Folkestone

Chichester

Maidstone

Colchester

Chelmsford

Crawley

Bedford

Richmond

Watford

Hastings

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 £4,039

Business Class flights to Londonfrom £2,789

Prem Econ Class flights to Londonfrom £1,421

Economy class flights to Londonfrom £463

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

£175 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

Everything you should know

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