LHR

$230 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 10/12. 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

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

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

Save 22% 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 round-trip 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 round-trip flight deals from Illinois to Heathrow

Wed, Jan 28 - Fri, Feb 6
Air Canada Logo
10:35 am - 6:30 amORD-LHR
13h 55m2 stops
Air Canada Logo
9:00 am - 6:51 pmLHR-ORD
15h 51m2 stops
$505Air Canada
Find Deal
Tue, Oct 28 - Tue, Nov 4
Virgin Atlantic Logo
6:23 pm - 8:45 amMDW-LHR
9h 22m1 stop
Virgin Atlantic Logo
11:05 am - 5:43 pmLHR-MDW
12h 38m1 stop
$505Virgin Atlantic
Find Deal
Tue, Sep 30 - Tue, Oct 7
United Airlines Logo
10:40 am - 6:30 amORD-LHR
13h 50m1 stop
United Airlines Logo
6:50 am - 12:05 pmLHR-ORD
11h 15m1 stop
$506United Airlines
Find Deal
Wed, Oct 22 - Fri, Oct 31
United Airlines Logo
7:11 am - 6:30 amORD-LHR
17h 19m1 stop
United Airlines Logo
6:50 am - 1:10 pmLHR-ORD
11h 20m1 stop
$507United Airlines
Find Deal
Sun, Mar 1 - Wed, May 6
Finnair Logo
12:05 pm - 8:15 amORD-LHR
14h 10m1 stop
Finnair Logo
7:30 am - 5:50 pmLHR-ORD
16h 20m1 stop
$508Finnair
Find Deal
Sun, Sep 28 - Tue, Oct 7
Air Canada Logo
7:11 am - 6:30 amORD-LHR
17h 19m1 stop
Air Canada Logo
6:50 am - 2:48 pmLHR-ORD
13h 58m2 stops
$509Air Canada
Find Deal
Sat, Nov 1 - Tue, Nov 25
United Airlines Logo
9:08 pm - 7:30 amORD-LHR
29h 22m1 stop
United Airlines Logo
1:25 pm - 2:55 pmLHR-ORD
31h 30m1 stop
$510United Airlines
Find Deal
Mon, Sep 29 - Thu, Oct 16
Austrian Airlines Logo
4:20 pm - 2:20 pmORD-LHR
16h 00m1 stop
Austrian Airlines Logo
6:00 am - 1:20 pmLHR-ORD
13h 20m1 stop
$511Austrian Airlines
Find Deal
Mon, Oct 27 - Tue, Nov 11
British Airways Logo
10:45 pm - 11:35 amORD-LHR
7h 50mnonstop
British Airways Logo
3:45 pm - 6:45 pmLHR-ORD
9h 00mnonstop
$512British Airways
Find Deal
Tue, Oct 14 - Tue, Oct 28
British Airways Logo
7:10 pm - 9:05 amORD-LHR
7h 55mnonstop
British Airways Logo
11:00 am - 2:50 pmLHR-ORD
8h 50mnonstop
$517British Airways
Find Deal

Everything you should know

Cheapest round-trip
$505
Overall average: $727
Air Canada
Wed 1/28Fri 2/6
ORD - LHR • 2 stops
Cheapest non-stop
$510
Typical prices: $666-1073
Finnair
Mon 11/17Wed 12/3
ORD - LHR • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Useful Info

Good to know

Low seasonFebruary
Cheapest flight$230
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 17% increase in price.
Flight from Chicago O'Hare Airport to London Heathrow Airport

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

Insights shared by verified travelers who flew the route from Illinois to Heathrow 
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 travelers 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 round-trip 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.

Traveling to a place near Heathrow?

Book flights to Heathrow if you plan to visit one of these locations
Hounslow
Wembley
Slough
Hayes
Richmond
Luton
Salisbury
Ilford
Crawley
Watford
Guildford
Northampton
Kingston upon Thames
Eastbourne
Swindon
Harrow
Hastings
St. Albans
Deal
Moreton-in-Marsh

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.