How does KAYAK find such low prices on flights from Illinois to London?

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. 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?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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?

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 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?

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 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>

$186 CHEAP FLIGHTS from Illinois to London

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

...and more

Travelers love KAYAK

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

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$546

Typical prices: $629-$862

Scandinavian Airlines

Mon 3/2Thu 3/5

ORD - LHR • 1 stop

Cheapest non-stop

$626

Typical prices: $699-$918

British Airways

Wed 1/21Fri 1/30

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 London!

Flight Deals

Cheap Flights from Illinois to London

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to London 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 London

Mon, Mar 2 - Thu, Mar 5

7:20 pm - 6:30 pm

ORD

LHR

17h 10m1 stop

6:40 am - 4:45 pm

LHR

ORD

16h 05m1 stop

$546Scandinavian Airlines

Mon, Jan 19 - Tue, Jan 27

6:30 pm - 7:25 pm

ORD

LGW

18h 55m2 stops

8:50 am - 5:20 pm

LGW

ORD

14h 30m2 stops

$546Multiple Airlines

Thu, Apr 30 - Wed, May 6

7:25 pm - 8:20 pm

ORD

LHR

18h 55m1 stop

1:05 pm - 9:40 pm

LHR

ORD

14h 35m1 stop

$550Icelandair

Fri, Jan 16 - Sat, Jan 24

8:15 pm - 3:45 pm

ORD

LGW

13h 30m1 stop

4:35 pm - 2:45 pm

LGW

ORD

28h 10m1 stop

$550TAP AIR PORTUGAL

Wed, Mar 18 - Tue, Mar 31

7:30 pm - 10:50 am

ORD

LHR

10h 20m1 stop

1:05 pm - 6:15 pm

LHR

ORD

11h 10m1 stop

$551Icelandair

Fri, Jan 16 - Tue, Jan 20

8:15 pm - 3:45 pm

ORD

LGW

13h 30m1 stop

4:35 pm - 3:00 pm

LGW

ORD

28h 25m1 stop

$551TAP AIR PORTUGAL

Wed, Jan 21 - Wed, Jan 28

6:50 pm - 12:55 pm

ORD

LCY

12h 05m1 stop

9:20 am - 4:20 pm

LCY

ORD

13h 00m1 stop

$619SWISS

Wed, Jan 14 - Tue, Jan 20

6:50 pm - 12:55 pm

ORD

LCY

12h 05m1 stop

9:15 am - 4:20 pm

LCY

ORD

13h 05m1 stop

$620SWISS

Wed, Jan 21 - Wed, Jan 28

4:25 pm - 8:10 am

ORD

LCY

9h 45m1 stop

9:20 am - 2:20 pm

LCY

ORD

11h 00m1 stop

$635Virgin Atlantic

Wed, Jan 14 - Tue, Jan 20

11:21 am - 8:45 am

MDW

LHR

15h 24m2 stops

6:30 am - 5:29 pm

LHR

MDW

16h 59m2 stops

$641Virgin Atlantic

Useful Info

Low season	January
High season	March
Cheapest flight	$186

Best time to beat the crowds with an average 11% drop in price.

Most popular time to fly and prices are also 7% lower on average.

Flight from St. Louis to London Gatwick Airport

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.

How does KAYAK find such low prices on flights from Illinois to London?
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.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to London?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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?
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 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?
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 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

Crawley

Watford

Guildford

Eastbourne

Kingston upon Thames

Colchester

St. Albans

Ipswich

Twickenham

Bedford

Barnet

Harrow

Hastings

Everything you need to know for your flight to London

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Cabin class types available on flights to Illinois

First Class flights to Londonfrom $4,620

Business Class flights to Londonfrom $1,914

Prem Econ Class flights to Londonfrom $1,444

Economy Class flights to Londonfrom $504

$186 Find Cheap Flights from Illinois to London

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

Everything you should know

Cheap Flights from Illinois to London

Recent round-trip flight deals from Illinois to London

Recent one-way flight deals from Illinois to London

Recent last minute flight deals from Illinois to London

Recent direct flight deals from Illinois to London

Good to know

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

FAQs for booking flights from Illinois to London

How does KAYAK find such low prices on flights from Illinois to London?

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.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to London?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London 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?

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 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?

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 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 London?

Everything you need to know for your flight to London

Cabin class types available on flights to Illinois

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

Find direct flights for London

Flights to other popular destinations

Flights from domestic origins to London

Choose which airport to fly into in London

Find deals for your return flight