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>

$222 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

Thu, Jan 15 - Mon, Jan 19

7:20 pm - 6:30 pmORD-LHR

17h 10m1 stop

3:35 pm - 4:45 pmLHR-ORD

55h 10m2 stops

$505Scandinavian Airlines

Find Deal

Mon, Sep 8 - Fri, Sep 12

7:25 pm - 11:45 amORD-LGW

10h 20m1 stop

3:40 pm - 9:15 pmLGW-ORD

11h 35m1 stop

$505Icelandair

Find Deal

Mon, Sep 22 - Tue, Oct 21

7:25 pm - 8:20 pmORD-LHR

18h 55m1 stop

9:25 pm - 6:15 pmLHR-ORD

26h 50m1 stop

$506Icelandair

Find Deal

Thu, Oct 30 - Fri, Nov 7

8:50 pm - 11:20 pmORD-STN

21h 30m3 stops

1:30 pm - 4:45 pmSTN-ORD

33h 15m3 stops

$509

Find Deal

Wed, Nov 12 - Wed, Nov 19

6:30 pm - 1:30 pmORD-LTN

13h 00m1 stop

7:30 am - 5:20 pmLTN-ORD

15h 50m1 stop

$510

Find Deal

Wed, Oct 15 - Wed, Oct 29

7:05 pm - 1:00 pmORD-LHR

11h 55m1 stop

9:00 am - 5:20 pmLHR-ORD

13h 20m1 stop

$525SWISS

Find Deal

Thu, Sep 25 - Wed, Oct 1

4:20 pm - 6:40 pmORD-LHR

20h 20m1 stop

10:25 am - 1:20 pmLHR-ORD

32h 55m1 stop

$550Austrian Airlines

Find Deal

Tue, Sep 23 - Tue, Sep 30

7:05 pm - 5:30 pmORD-LCY

16h 25m1 stop

1:05 pm - 3:55 pmLCY-ORD

32h 50m1 stop

$551SWISS

Find Deal

Sun, Nov 2 - Sat, Dec 6

8:25 pm - 3:45 pmORD-LGW

13h 20m1 stop

4:35 pm - 3:00 pmLGW-ORD

28h 25m1 stop

$553TAP AIR PORTUGAL

Find Deal

Thu, Sep 25 - Wed, Oct 1

6:00 pm - 12:45 pmORD-LHR

12h 45m1 stop

1:45 pm - 12:35 pmLHR-ORD

28h 50m1 stop

$556TAP AIR PORTUGAL

Find Deal

Useful Info

Low season	February
High season	March
Cheapest flight	$222

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

Crawley

Guildford

Watford

Eastbourne

Kingston upon Thames

Southend-on-Sea

Deal

Harrow

Hastings

Southall

St. Albans

Bedford

Folkestone

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 $1,572

Prem Econ Class flights to Londonfrom $1,505

Economy Class flights to Londonfrom $501

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

$222 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

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