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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$255 CHEAP FLIGHTS from Illinois to London Heathrow (LHR)

LHR

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

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Cheapest round-trip

$547

Typical prices: $632-$857

Scandinavian Airlines

Mon 3/9Wed 3/18

ORD - LHR • 2 stops

Cheapest non-stop

$566

Typical prices: $627-$832

British Airways

Sun 11/16Tue 11/25

ORD - LHR • Non-stop

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KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to Heathrow!

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.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Heathrow

Mon, Mar 9 - Wed, Mar 18

8:20 pm - 4:25 pmORD-LHR

15h 05m2 stops

10:20 am - 5:45 pmLHR-ORD

12h 25m1 stop

$547Scandinavian Airlines

Find Deal

Thu, Jan 29 - Sun, Feb 8

7:20 pm - 4:25 pmORD-LHR

15h 05m2 stops

3:35 pm - 4:45 pmLHR-ORD

31h 10m2 stops

$548Scandinavian Airlines

Find Deal

Fri, Jan 16 - Mon, Jan 19

7:20 pm - 8:55 amORD-LHR

31h 35m2 stops

7:05 am - 4:45 pmLHR-ORD

15h 40m2 stops

$549Scandinavian Airlines

Find Deal

Fri, Nov 28 - Fri, Dec 5

8:15 pm - 9:35 pmORD-LHR

19h 20m1 stop

6:00 am - 3:25 pmLHR-ORD

15h 25m1 stop

$551TAP AIR PORTUGAL

Find Deal

Mon, Dec 1 - Tue, Dec 9

1:47 pm - 7:05 amMDW-LHR

11h 18m1 stop

6:20 am - 6:00 pmLHR-MDW

17h 40m2 stops

$589Delta

Find Deal

Mon, Dec 1 - Tue, Dec 9

12:47 pm - 6:25 amMDW-LHR

11h 38m1 stop

6:20 am - 6:00 pmLHR-MDW

17h 40m2 stops

$590Delta

Find Deal

Wed, Dec 31 - Thu, Jan 15

9:29 am - 9:00 amMDW-LHR

17h 31m2 stops

9:00 am - 10:09 pmLHR-MDW

19h 09m2 stops

$594Virgin Atlantic

Find Deal

Wed, Dec 3 - Wed, Dec 10

1:14 pm - 10:15 amMDW-LHR

15h 01m2 stops

11:45 am - 11:47 pmLHR-MDW

18h 02m2 stops

$595Virgin Atlantic

Find Deal

Mon, Nov 24 - Wed, Dec 3

6:43 pm - 3:50 pmSTL-LHR

15h 07m2 stops

11:10 am - 9:40 pmLHR-STL

16h 30m2 stops

$614Lufthansa

Find Deal

Mon, Nov 24 - Wed, Dec 3

6:43 pm - 3:50 pmSTL-LHR

15h 07m2 stops

6:30 am - 1:55 pmLHR-STL

13h 25m1 stop

$616Lufthansa

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	$255

Best time to beat the crowds with an average 11% 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

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.

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.

Hounslow

Slough

Wembley

Hayes

Richmond

Luton

Ilford

Salisbury

Crawley

Guildford

Watford

Kingston upon Thames

Eastbourne

Colchester

Ipswich

St. Albans

Northampton

Swindon

Twickenham

Harrow

Everything you need to know for your flight to Heathrow

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London Heathrow Airport (LHR)

LHR

$255 Find Cheap Flights from Illinois to London Heathrow Airport

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

Everything you should know

Cheap Flights from Illinois to Heathrow

Recent round-trip flight deals from Illinois to Heathrow

Recent one-way flight deals from Illinois to Heathrow

Recent last minute flight deals from Illinois to Heathrow

Recent direct flight deals from Illinois to Heathrow

Good to know

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

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?

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

Cabin class types available on flights to Heathrow

Complete your trip to Heathrow with a hotel stay or car rental

Find direct flights for Heathrow

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Flights from domestic origins to Illinois

Choose which airport to fly into in London

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