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>

$238 CHEAP FLIGHTS from Illinois to London Heathrow (LHR)

LHR

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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.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Heathrow

mer., nov. 5 - mar., nov. 11

12:50 pm - 7:10 amORD-LHR

12h 20m1 stop

9:00 am - 6:39 pmLHR-ORD

15h 39m2 stops

$505Air Canada

Find Deal

lun., déc. 1 - mar., déc. 9

12:50 pm - 7:10 amORD-LHR

12h 20m1 stop

9:00 am - 6:52 pmLHR-ORD

15h 52m2 stops

$506Multiple Airlines

Find Deal

mer., oct. 22 - ven., oct. 31

6:00 pm - 8:20 amORD-LHR

8h 20mnonstop

6:50 am - 1:10 pmLHR-ORD

11h 20m1 stop

$507United Airlines

Find Deal

lun., sept. 29 - mar., oct. 21

4:20 pm - 2:20 pmORD-LHR

16h 00m1 stop

6:00 am - 1:20 pmLHR-ORD

13h 20m1 stop

$511Austrian Airlines

Find Deal

mer., nov. 5 - jeu., nov. 20

3:50 pm - 11:25 amORD-LHR

13h 35m1 stop

6:20 am - 3:10 pmLHR-ORD

14h 50m1 stop

$512Delta

Find Deal

dim., oct. 19 - mar., nov. 4

9:15 pm - 11:05 amORD-LHR

7h 50mnonstop

3:45 pm - 6:45 pmLHR-ORD

9h 00mnonstop

$513British Airways

Find Deal

mer., oct. 8 - mer., mars 11

1:08 pm - 11:25 amORD-LHR

16h 17m1 stop

8:55 am - 4:10 pmLHR-ORD

12h 15m1 stop

$514Delta

Find Deal

mar., sept. 30 - mar., oct. 21

4:00 pm - 6:20 amORD-LHR

8h 20mnonstop

2:10 pm - 5:20 pmLHR-ORD

9h 10mnonstop

$518United Airlines

Find Deal

lun., oct. 6 - lun., oct. 13

6:00 pm - 8:20 amORD-LHR

8h 20mnonstop

3:05 pm - 1:20 pmLHR-ORD

28h 15m1 stop

$527Austrian Airlines

Find Deal

sam., nov. 1 - mar., nov. 25

8:35 pm - 11:15 amORD-LHR

33h 40m1 stop

3:05 pm - 9:15 pmLHR-ORD

12h 10m1 stop

$537British Airways

Find Deal

Cheapest round-trip

$505

Overall average: $691

Air Canada

mer. 11/5mar. 11/11

ORD - LHR • 1 stop

Cheapest non-stop

$507

Typical prices: $649-891

Air Canada

dim. 9/28mar. 10/7

ORD - LHR • Non-stop

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We hope you love your trip to Heathrow!

Useful Info

Low season	February
High season	July
Cheapest flight	$238

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

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

Wembley

Slough

Hayes

Richmond

Luton

Salisbury

Ilford

Watford

Crawley

Guildford

Eastbourne

Northampton

Kingston upon Thames

Swindon

Harrow

Hastings

St. Albans

Moreton-in-Marsh

Barnet

Everything you need to know for your flight to Heathrow

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London Heathrow Airport (LHR)

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LHR

$238 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

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

Everything you should know

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

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