LHR

$165 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 10/5. 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 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

Sun, Nov 16 - Sat, Nov 22
Scandinavian Airlines Logo
7:20 pm - 6:30 pmORD-LHR
17h 10m1 stop
Scandinavian Airlines Logo
10:20 am - 4:45 pmLHR-ORD
12h 25m1 stop
$427Scandinavian Airlines
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Mon, Oct 27 - Mon, Nov 10
Scandinavian Airlines Logo
8:20 pm - 4:00 pmORD-LHR
14h 40m1 stop
Scandinavian Airlines Logo
10:20 am - 4:45 pmLHR-ORD
12h 25m1 stop
$428Scandinavian Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
Air Canada Logo
10:40 am - 6:30 amORD-LHR
13h 50m1 stop
Air Canada Logo
9:30 am - 2:55 pmLHR-ORD
11h 25m1 stop
$455Air Canada
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Tue, Aug 5 - Wed, Aug 20
British Airways Logo
10:30 pm - 12:15 pmORD-LHR
7h 45mnonstop
British Airways Logo
1:10 pm - 3:55 pmLHR-ORD
8h 45mnonstop
$465British Airways
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Tue, Aug 5 - Wed, Aug 20
Iberia Logo
3:16 pm - 7:50 amORD-LHR
10h 34m1 stop
Iberia Logo
9:15 am - 11:55 amLHR-ORD
8h 40mnonstop
$466Iberia
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Mon, Aug 25 - Wed, Sep 24
Iberia Logo
8:35 pm - 10:30 amORD-LHR
7h 55mnonstop
Iberia Logo
9:15 am - 11:50 amLHR-ORD
8h 35mnonstop
$467Iberia
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Wed, Aug 13 - Thu, Aug 28
Finnair Logo
9:30 pm - 10:10 pmORD-LHR
18h 40m1 stop
Finnair Logo
7:30 am - 5:50 pmLHR-ORD
16h 20m1 stop
$473Finnair
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Wed, Aug 20 - Thu, Aug 28
Finnair Logo
9:30 pm - 5:05 pmORD-LHR
13h 35m1 stop
Finnair Logo
9:30 am - 5:50 pmLHR-ORD
14h 20m1 stop
$475Finnair
Find Deal
Wed, Aug 27 - Wed, Sep 3
Air Canada Logo
10:40 am - 6:30 amORD-LHR
13h 50m1 stop
Air Canada Logo
6:50 am - 8:11 pmLHR-ORD
19h 21m2 stops
$481Air Canada
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Mon, Sep 1 - Fri, Sep 12
British Airways Logo
9:15 pm - 11:05 amORD-LHR
7h 50mnonstop
British Airways Logo
6:20 am - 3:45 pmLHR-ORD
15h 25m1 stop
$488British Airways
Find Deal
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Good to know

Low seasonFebruary
High seasonJuly
Cheapest flight$165
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 21% 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
Ilford
Deal
Southall
St. Albans
Folkestone
Chipping Campden
Barnet
Bishop's Stortford
Ascot
Enfield
Ely
Rye
Edgware
Weybridge
Alton
Woodstock
Christchurch
Beaconsfield
Hatfield
Dorking

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

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