£236 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 4/8. 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, 0 bags

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

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

Save 31% 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.

Flight Deals
Useful Info
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.

Recent return flight deals from Illinois to Heathrow

Mon, 10 Aug - Sun, 23 Aug
Icelandair Logo
19:25 - 11:55
ORD
-
LHR
10h 30m
1 stop
Icelandair Logo
21:25 - 18:15
LHR
-
ORD
26h 50m
1 stop
£565Icelandair
Sun, 16 Aug - Mon, 24 Aug
Icelandair Logo
22:25 - 11:55
ORD
-
LHR
31h 30m
1 stop
Icelandair Logo
21:25 - 18:15
LHR
-
ORD
26h 50m
1 stop
£566Icelandair
Sun, 18 Oct - Sun, 1 Nov
Scandinavian Airlines Logo
19:15 - 16:25
ORD
-
LHR
15h 10m
2 stops
Scandinavian Airlines Logo
06:40 - 17:45
LHR
-
ORD
16h 05m
2 stops
£572Scandinavian Airlines
Sun, 18 Oct - Sun, 1 Nov
Scandinavian Airlines Logo
19:15 - 17:40
ORD
-
LHR
16h 25m
1 stop
Scandinavian Airlines Logo
06:40 - 17:45
LHR
-
ORD
16h 05m
2 stops
£574Scandinavian Airlines
Mon, 28 Sep - Sun, 4 Oct
Virgin Atlantic Logo
12:00 - 10:40
BMI
-
LHR
16h 40m
2 stops
Virgin Atlantic Logo
11:15 - 22:22
LHR
-
BMI
17h 07m
1 stop
£620Virgin Atlantic
Tue, 29 Sep - Wed, 14 Oct
Iberia Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
Iberia Logo
06:15 - 20:08
LHR
-
STL
19h 53m
2 stops
£634Iberia
Tue, 29 Sep - Wed, 14 Oct
Iberia Logo
20:07 - 12:15
STL
-
LHR
10h 08m
1 stop
Iberia Logo
06:15 - 20:08
LHR
-
STL
19h 53m
2 stops
£637Iberia
Sun, 14 Jun - Sun, 21 Jun
Multiple Airlines Logo
10:15 - 10:00
MDW
-
LHR
17h 45m
2 stops
Multiple Airlines Logo
12:40 - 14:35
LHR
-
MDW
31h 55m
3 stops
£640Multiple Airlines
Tue, 29 Sep - Wed, 7 Oct
Multiple Airlines Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
Multiple Airlines Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£643Multiple Airlines
Sun, 23 Aug - Fri, 4 Sep
Virgin Atlantic Logo
10:54 - 07:10
MDW
-
LHR
14h 16m
2 stops
Virgin Atlantic Logo
06:30 - 18:31
LHR
-
MDW
18h 01m
2 stops
£649Virgin Atlantic
Useful Info

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

Low seasonJanuary
Cheapest flight£236
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly (4% more expensive on average)
Flight from St. Louis 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 Airways
ORD
-
LHR
Mar 2026
Take early morning flights to adjust to weather-related delays.
Verified travelerFlew with British Airways
ORD
-
LHR
Jun 2025
Get a wheel chair if you have difficulty walking
JoeFlew with Iberia
ORD
-
LHR
Apr 2025
Get there early. Nice airport options while you wait.
Verified travelerFlew with Iberia
ORD
-
LHR
May 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 Airlines
ORD
-
LHR
Jan 2025
Anticipate delays, prepare for long walks through Heathrow to baggage claim or for connections.
KariFlew with British Airways
ORD
-
LHR
May 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 Airlines
ORD
-
LHR
Dec 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
Hounslow
Luton
Southend-on-Sea
Northampton
Swindon
Slough
Winchester
Stansted
Croydon
Folkestone
Poole
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)