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>

£166 CHEAP FLIGHTS from Illinois to London

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

...and more

Travellers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

Save 26% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheap Flight Deals 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.

Round-trip

One-way

Last minute

Direct

Recent return flight deals from Illinois to London

KAYAK's recommended return flight deals from the most popular airlines that fly from Illinois to London.

Discover the best prices for you by selecting your travel dates on KAYAK.

Choose your dates

19:15 - 08:55ORD-LHR

31h 40m2 stops

06:40 - 16:10LHR-ORD

15h 30m1 stop

£296Scandinavian Airlines

Find Deal

Sat, 27 Sep - Tue, 30 Sep

19:15 - 17:40ORD-LHR

16h 25m1 stop

06:40 - 16:10LHR-ORD

15h 30m1 stop

£318Scandinavian Airlines

Find Deal

Tue, 23 Sep - Tue, 30 Sep

18:00 - 18:50ORD-LHR

18h 50m1 stop

18:30 - 16:00LHR-ORD

26h 30m1 stop

£416TAP AIR PORTUGAL

Find Deal

Thu, 16 Oct - Tue, 28 Oct

18:10 - 15:35ORD-LGW

15h 25m1 stop

10:35 - 16:10LGW-ORD

35h 35m1 stop

£419TAP AIR PORTUGAL

Find Deal

Mon, 22 Sep - Tue, 21 Oct

15:45 - 08:00ORD-LHR

10h 15m1 stop

13:25 - 19:00LHR-ORD

11h 35m1 stop

£433Aer Lingus

Find Deal

Tue, 5 Aug - Wed, 20 Aug

19:25 - 14:40ORD-LGW

13h 15m1 stop

15:40 - 18:15LGW-ORD

32h 35m1 stop

£434Icelandair

Find Deal

Fri, 10 Oct - Fri, 17 Oct

07:00 - 06:55ORD-LGW

17h 55m1 stop

21:30 - 19:29LGW-ORD

27h 59m2 stops

£435

Find Deal

Wed, 16 Jul - Thu, 24 Jul

07:00 - 06:55ORD-LGW

17h 55m1 stop

10:00 - 14:16LGW-ORD

34h 16m1 stop

£438

Find Deal

Wed, 23 Jul - Tue, 19 Aug

22:15 - 11:55ORD-LHR

31h 40m1 stop

21:25 - 21:15LHR-ORD

29h 50m1 stop

£452Icelandair

Find Deal

Sun, 10 Aug - Wed, 20 Aug

21:15 - 13:25ORD-LHR

10h 10m1 stop

08:50 - 14:00LHR-ORD

11h 10m1 stop

£466Aer Lingus

Find Deal

Sun, 11 May - Tue, 20 May

Low season	February
High season	March
Cheapest flight	£166

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

Most popular time to fly and prices are also 18% lower on average.

Flight from Chicago to London Gatwick Airport

JoeFlew with IberiaORD-LHRApr 2025

Get there early. Nice airport options while you wait.

DinaFlew with United AirlinesORD-LHRJan 2025

Anticipate delays, prepare for long walks through Heathrow to baggage claim or for connections.

Verified travelerFlew with United AirlinesORD-LHRJul 2024

Even though you may have a delay or two the important part is that you arrive safely from one point to the next. I wish I could get some credit back since I paid for a nonstop flight and ended up having a connecting flight.

Verified travelerFlew with British AirwaysORD-LHRMay 2024

Make sure you get a airline that allows one check-in luggage and respects its customers.

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.

See more FAQs

Gatwick

Milton Keynes

Eastbourne

Luton

Southend-on-Sea

Winchester

Croydon

Slough

Stansted

Chichester

Maidstone

Folkestone

Colchester

Crawley

Chelmsford

Hastings

Bedford

Watford

Basingstoke

Newbury

Everything you need to know for your flight to London

Cabin class types available on flights to Illinois

First Class flights to Londonfrom £4,802

Business Class flights to Londonfrom £3,848

Prem Econ Class flights to Londonfrom £2,074

Economy class flights to Londonfrom £464

£166 Find Cheap Flights from Illinois to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to London departing on 22/7. 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.

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

Cheap Flight Deals 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

Low season

High season

Cheapest flight

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?

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

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

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

Travelling to a place near London?

Everything you need to know for your flight to London

Cabin class types available on flights to Illinois

Cabin classes available on flights to London. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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

Find direct flights for London

Flights to other popular destinations

The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.

Flights from domestic origins to London

Flights from all regions of Illinois to London. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

Choose which airport to fly into in London

Find deals for your return flight