£272 Find Cheap Flights from Illinois to London Heathrow Airport

This is the cheapest return flight price found by a KAYAK user in the last 72 hours by searching for a flight to Heathrow departing on 5/12. 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

Fri, 5 Dec - Mon, 8 Dec
Scandinavian Airlines Logo
19:20 - 09:35ORD-LHR
32h 15m2 stops
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m2 stops
£272Scandinavian Airlines
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Fri, 5 Dec - Mon, 8 Dec
Scandinavian Airlines Logo
19:20 - 12:55ORD-LHR
35h 35m2 stops
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m1 stop
£275Scandinavian Airlines
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Thu, 11 Sep - Thu, 18 Sep
Logo
17:10 - 17:45ORD-LHR
18h 35m2 stops
Logo
06:00 - 23:10LHR-ORD
23h 10m2 stops
£406
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Thu, 11 Sep - Mon, 15 Sep
TAP AIR PORTUGAL Logo
18:00 - 22:55ORD-LHR
22h 55m1 stop
TAP AIR PORTUGAL Logo
06:00 - 16:40LHR-ORD
16h 40m1 stop
£407TAP AIR PORTUGAL
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Mon, 8 Sep - Mon, 15 Sep
TAP AIR PORTUGAL Logo
18:10 - 17:45ORD-LHR
17h 35m1 stop
TAP AIR PORTUGAL Logo
06:00 - 16:40LHR-ORD
16h 40m1 stop
£410TAP AIR PORTUGAL
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Tue, 12 Aug - Thu, 28 Aug
Icelandair Logo
22:15 - 20:20ORD-LHR
16h 05m1 stop
Icelandair Logo
13:05 - 18:15LHR-ORD
11h 10m1 stop
£431Icelandair
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Tue, 22 Jul - Tue, 29 Jul
Icelandair Logo
19:25 - 20:20ORD-LHR
18h 55m1 stop
Icelandair Logo
21:25 - 18:15LHR-ORD
26h 50m1 stop
£434Icelandair
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Thu, 11 Sep - Thu, 18 Sep
Logo
07:15 - 17:45ORD-LHR
28h 30m3 stops
Logo
06:00 - 23:10LHR-ORD
23h 10m2 stops
£436
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Tue, 12 Aug - Thu, 28 Aug
Finnair Logo
16:55 - 06:50ORD-LHR
7h 55mdirect
Finnair Logo
10:20 - 17:50LHR-ORD
13h 30m1 stop
£440Finnair
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Tue, 23 Sep - Tue, 30 Sep
Finnair Logo
12:28 - 09:00STL-LHR
14h 32m1 stop
Finnair Logo
08:20 - 18:27LHR-STL
16h 07m1 stop
£479Finnair
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Good to know - Cheap tickets from Illinois to London Heathrow Airport

Low seasonFebruary
High seasonAugust
Cheapest flight£142
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly and prices are also 1% lower 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
Swindon
Northampton
Southend-on-Sea
Winchester
Slough
Croydon
Stansted
Poole
Chichester
Folkestone
Maidstone
Colchester
Salisbury
Crawley
Chelmsford
Bedford

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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