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

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 Heathrow Airport. 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 Heathrow Airport?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Illinois is likely to change within 7 days, so travellers 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 Heathrow Airport?

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 Heathrow Airport 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 Heathrow Airport?

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 Heathrow Airport 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>

£204 CHEAP FLIGHTS from Illinois to London Heathrow (LHR)

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

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Cheapest return fare

£424

Overall average: £718

TAP AIR PORTUGAL

Wed 3/12Sat 13/12

ORD - LHR • 1 stop

Cheapest direct flights

£439

Typical prices: £492-£642

Finnair

Sun 8/2Thu 5/3

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 Heathrow!

Flight Deals

Cheap Flights from Illinois to Heathrow

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

Wed, 3 Dec - Sat, 13 Dec

19:10 - 22:40ORD-LHR

21h 30m1 stop

19:55 - 14:45LHR-ORD

24h 50m1 stop

£424TAP AIR PORTUGAL

Find Deal

Sun, 11 Jan - Sat, 17 Jan

19:10 - 16:25ORD-LHR

15h 15m2 stops

10:20 - 16:45LHR-ORD

12h 25m1 stop

£425Scandinavian Airlines

Find Deal

Wed, 22 Apr - Mon, 27 Apr

19:25 - 11:55ORD-LHR

10h 30m1 stop

13:05 - 18:15LHR-ORD

11h 10m1 stop

£427Icelandair

Find Deal

Sun, 7 Dec - Tue, 16 Dec

18:30 - 10:50ORD-LHR

10h 20m1 stop

20:35 - 17:20LHR-ORD

26h 45m1 stop

£428Icelandair

Find Deal

Mon, 1 Dec - Tue, 9 Dec

13:47 - 07:05MDW-LHR

11h 18m1 stop

06:20 - 18:00LHR-MDW

17h 40m2 stops

£451Delta

Find Deal

Mon, 1 Dec - Tue, 9 Dec

13:47 - 07:05MDW-LHR

11h 18m1 stop

11:05 - 18:18LHR-MDW

13h 13m1 stop

£457Delta

Find Deal

Wed, 3 Dec - Wed, 10 Dec

10:49 - 11:40MDW-LHR

18h 51m1 stop

06:30 - 16:34LHR-MDW

16h 04m2 stops

£479Virgin Atlantic

Find Deal

Mon, 1 Dec - Tue, 9 Dec

13:15 - 08:45MDW-LHR

13h 30m1 stop

11:45 - 23:47LHR-MDW

18h 02m2 stops

£480Virgin Atlantic

Find Deal

Wed, 4 Mar - Tue, 10 Mar

13:25 - 05:55PIA-LHR

10h 30m1 stop

06:30 - 16:40LHR-PIA

15h 10m2 stops

£482Lufthansa

Find Deal

Wed, 4 Mar - Tue, 10 Mar

17:25 - 15:50PIA-LHR

16h 25m2 stops

06:30 - 16:40LHR-PIA

15h 10m2 stops

£488Lufthansa

Find Deal

Useful Info

Low season	February
High season	July
Cheapest flight	£204

Best time to beat the crowds (7% less expensive on average)

Most popular time to fly (13% more expensive on average)

Flight from Chicago to London Heathrow 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 Heathrow Airport?
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 Heathrow Airport.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to London Heathrow Airport?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Illinois is likely to change within 7 days, so travellers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to London Heathrow Airport?
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 Heathrow Airport 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 Heathrow Airport?
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 Heathrow Airport from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Gatwick

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Eastbourne

Luton

Hounslow

Southend-on-Sea

Northampton

Swindon

Slough

Winchester

Croydon

Stansted

Poole

Folkestone

Chichester

Maidstone

Salisbury

Colchester

Chelmsford

Crawley

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London Heathrow Airport (LHR)

£230 Find Cheap Flights from Illinois to London Heathrow Airport

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

Everything you should know

Cheap Flights from Illinois to Heathrow

Recent return flight deals from Illinois to Heathrow

Recent one-way flight deals from Illinois to Heathrow

Recent last minute flight deals from Illinois to Heathrow

Recent direct flight deals from Illinois to Heathrow

Good to know - Cheap tickets from Illinois to London Heathrow Airport

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

FAQs for booking Illinois to London Heathrow Airport flights

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

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 Heathrow Airport.

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Illinois is likely to change within 7 days, so travellers know whether to wait or book now.

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

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 Heathrow Airport 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 Heathrow Airport?

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 Heathrow Airport 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 Heathrow?

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

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

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Flights from domestic origins to Illinois

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