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>

$230 CHEAP FLIGHTS from Illinois to London

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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

Wed, Nov 5 - Tue, 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

Mon, Dec 1 - Tue, Dec 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

Wed, Oct 22 - Fri, 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

Mon, Sep 29 - Tue, 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

Wed, Nov 5 - Thu, 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

Sat, Nov 8 - Sun, Nov 16

6:30 pm - 10:55 amORD-LGW

10h 25m1 stop

11:55 am - 5:20 pmLGW-ORD

11h 25m1 stop

$512Icelandair

Find Deal

Sun, Oct 5 - Tue, Oct 14

10:15 pm - 2:40 pmORD-LGW

10h 25m1 stop

3:40 pm - 6:15 pmLGW-ORD

32h 35m1 stop

$513Icelandair

Find Deal

Wed, Oct 8 - Wed, Mar 11

1:08 pm - 11:25 amORD-LHR

16h 17m1 stop

8:55 am - 4:10 pmLHR-ORD

12h 15m1 stop

$514Delta

Find Deal

Tue, Sep 30 - Tue, Oct 21

4:00 pm - 6:20 amORD-LHR

8h 20mnonstop

2:10 pm - 5:20 pmLHR-ORD

9h 10mnonstop

$518United Airlines

Find Deal

Mon, Oct 6 - Mon, 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

Cheapest round-trip

$505

Overall average: $691

Air Canada

Wed 11/5Tue 11/11

ORD - LHR • 1 stop

Cheapest non-stop

$507

Typical prices: $649-891

Air Canada

Sun 9/28Tue 10/7

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 London!

Useful Info

Low season	February
High season	March
Cheapest flight	$230

Best time to beat the crowds with an average 8% drop in price.

Most popular time to fly and prices are also 14% lower on average.

Flight from St. Louis to London Gatwick 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?
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

Wembley

Slough

Hayes

Richmond

Luton

Ilford

Watford

Crawley

Guildford

Eastbourne

Kingston upon Thames

Harrow

Hastings

St. Albans

Barnet

Bedford

Southall

Southend-on-Sea

Ipswich

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 $1,925

Prem Econ Class flights to Londonfrom $1,457

Economy Class flights to Londonfrom $518

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

$230 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

Everything you should know

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