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>

$219 CHEAP FLIGHTS from Illinois to London

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Cheap Flights from Illinois to London

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, Aug 24 - Sun, Aug 30

3:45 pm - 12:45 pm

ORD

LTN

15h 00m

1 stop

9:00 am - 2:00 pm

LTN

ORD

11h 00m

1 stop

$932Multiple Airlines

Fri, Nov 20 - Fri, Nov 27

7:15 pm - 4:25 pm

ORD

LHR

15h 10m

2 stops

7:05 am - 4:45 pm

LHR

ORD

15h 40m

2 stops

$932Scandinavian Airlines

Mon, Oct 5 - Mon, Oct 19

12:29 pm - 8:50 am

ORD

LCY

14h 21m

2 stops

10:00 am - 2:30 pm

LCY

ORD

10h 30m

1 stop

$932Virgin Atlantic

Sun, Sep 6 - Sun, Sep 20

10:25 pm - 2:40 pm

ORD

LGW

10h 15m

1 stop

3:40 pm - 9:25 pm

LGW

ORD

11h 45m

1 stop

$932Icelandair

Sun, Aug 16 - Sun, Aug 23

3:45 pm - 7:50 am

ORD

STN

10h 05m

1 stop

6:35 am - 2:00 pm

STN

ORD

13h 25m

1 stop

$932Multiple Airlines

Sun, Oct 4 - Sat, Oct 10

10:30 am - 8:50 am

ORD

LCY

16h 20m

2 stops

8:25 am - 2:15 pm

LCY

ORD

11h 50m

1 stop

$933Virgin Atlantic

Thu, Oct 8 - Sun, Oct 18

2:50 pm - 10:15 am

ORD

LHR

13h 25m

1 stop

9:45 am - 12:30 pm

LHR

ORD

8h 45mnonstop

$933British Airways

Tue, Aug 18 - Mon, Aug 31

4:30 pm - 6:45 am

ORD

LHR

8h 15mnonstop

4:25 pm - 2:00 pm

LHR

ORD

27h 35m

1 stop

$934United Airlines

Mon, Aug 3 - Thu, Aug 20

4:30 pm - 6:45 am

ORD

LHR

8h 15mnonstop

9:30 am - 7:55 pm

LHR

ORD

16h 25m

1 stop

$935United Airlines

Tue, Aug 4 - Tue, Aug 18

9:35 pm - 11:35 am

STL

LHR

8h 00mnonstop

1:10 pm - 7:27 pm

LHR

STL

12h 17m

1 stop

$1,085British Airways

Useful Info

Low season	February
High season	March
Cheapest flight	$219

Best time to beat the crowds with an average 17% drop in price.

Most popular time to fly and prices are also 15% lower on average.

Flight from St. Louis to London Gatwick Airport

Verified travelerFlew with British Airways

ORD

LHR

Mar 2026

Take early morning flights to adjust to weather-related delays.

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

Hayes

Slough

Richmond

Wembley

Luton

Crawley

Ilford

Eastbourne

Watford

Bedford

Colchester

Guildford

Twickenham

Ipswich

Kingston upon Thames

St. Albans

Maidenhead

Newbury

Harrow

Everything you need to know for your flight to London

Cabin class

Complete your trip

Direct Flights

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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 $1,780

Premium Economy Class flights to Londonfrom $1,672

Economy Class flights to Londonfrom $868

$219 Find Cheap Flights from Illinois to London

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

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

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

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Choose which airport to fly into in London

Find deals for your return flight