£174 Find Cheap Flights from Illinois to London Heathrow Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Heathrow departing on 19/10. 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.
1 adult
1 adult, Economy

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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.

Recent return flight deals from Illinois to Heathrow

Wed, 5 Nov - Tue, 11 Nov
Air Canada Logo
12:50 - 07:10ORD-LHR
12h 20m1 stop
Air Canada Logo
09:00 - 18:39LHR-ORD
15h 39m2 stops
£370Air Canada
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Mon, 1 Dec - Tue, 9 Dec
Multiple Airlines Logo
12:50 - 07:10ORD-LHR
12h 20m1 stop
Multiple Airlines Logo
09:00 - 18:52LHR-ORD
15h 52m2 stops
£371Multiple Airlines
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Wed, 22 Oct - Fri, 31 Oct
United Airlines Logo
08:40 - 09:35ORD-LHR
18h 55m1 stop
United Airlines Logo
06:50 - 13:10LHR-ORD
11h 20m1 stop
£371United Airlines
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Mon, 29 Sep - Tue, 21 Oct
Austrian Airlines Logo
16:20 - 14:20ORD-LHR
16h 00m1 stop
Austrian Airlines Logo
06:00 - 13:20LHR-ORD
13h 20m1 stop
£374Austrian Airlines
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Wed, 5 Nov - Thu, 20 Nov
Delta Logo
15:50 - 11:25ORD-LHR
13h 35m1 stop
Delta Logo
06:20 - 15:10LHR-ORD
14h 50m1 stop
£375Delta
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Wed, 8 Oct - Wed, 11 Mar
Delta Logo
13:08 - 11:25ORD-LHR
16h 17m1 stop
Delta Logo
08:55 - 16:10LHR-ORD
12h 15m1 stop
£377Delta
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Wed, 8 Oct - Wed, 15 Oct
Iberia Logo
13:43 - 06:20ORD-LHR
10h 37m1 stop
Iberia Logo
14:25 - 17:00LHR-ORD
8h 35mdirect
£379Iberia
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Sun, 28 Sep - Tue, 7 Oct
United Airlines Logo
16:00 - 06:20ORD-LHR
8h 20mdirect
United Airlines Logo
14:10 - 17:20LHR-ORD
9h 10mdirect
£380United Airlines
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Mon, 6 Oct - Mon, 13 Oct
Austrian Airlines Logo
18:00 - 08:20ORD-LHR
8h 20mdirect
Austrian Airlines Logo
15:05 - 13:20LHR-ORD
28h 15m1 stop
£386Austrian Airlines
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Thu, 15 Jan - Mon, 26 Jan
Iberia Logo
13:48 - 08:15STL-LHR
12h 27m1 stop
Iberia Logo
19:40 - 09:57LHR-STL
20h 17m2 stops
£411Iberia
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Everything you should know

Cheapest return fare
£370
Overall average: £506
Air Canada
Wed 5/11Tue 11/11
ORD - LHR • 1 stop
Cheapest direct flights
£371
Typical prices: £475-652
Air Canada
Sun 28/9Tue 7/10
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!
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Good to know - Cheap tickets from Illinois to London Heathrow Airport

Low seasonFebruary
Cheapest flight£174
Best time to beat the crowds (7% less expensive on average)
Most popular time to fly (11% more expensive on average)
Flight from Chicago to London Heathrow Airport

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

Insights shared by verified travellers who flew the route from Illinois to Heathrow 
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 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?

Book flights to Heathrow if you plan to visit one of these locations
Gatwick
Milton Keynes
Eastbourne
Luton
Hounslow
Southend-on-Sea
Northampton
Swindon
Slough
Winchester
Croydon
Stansted
Poole
Folkestone
Chichester
Maidstone
Colchester
Salisbury
Chelmsford
Crawley

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

London Heathrow Airport (LHR)

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