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Cheap flights from London to Illinois from $286

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Illinois departing on 3/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
11:55 am - 5:20 pm
LGW
-
ORD
11h 25m
1 stop
Icelandair Logo
6:30 pm - 10:55 am
ORD
-
LGW
10h 25m
1 stop
$528Icelandair
Wed, Feb 11 - Sat, Feb 14
Icelandair Logo
12:15 pm - 5:20 pm
LHR
-
ORD
11h 05m
1 stop
Icelandair Logo
6:30 pm - 10:50 am
ORD
-
LHR
10h 20m
1 stop
$528Icelandair
Thu, Feb 19 - Mon, Feb 23
Multiple Airlines Logo
1:00 pm - 1:02 pm
LGW
-
MDW
29h 02m
1 stop
Multiple Airlines Logo
9:51 pm - 10:00 am
MDW
-
LGW
31h 09m
1 stop
$529Multiple Airlines
Wed, Mar 18 - Mon, Mar 23
Austrian Airlines Logo
6:00 am - 3:00 pm
LHR
-
ORD
14h 00m
1 stop
Austrian Airlines Logo
2:30 pm - 10:50 am
ORD
-
LHR
15h 20m
1 stop
$531Austrian Airlines
Fri, Mar 13 - Fri, Mar 20
Lufthansa Logo
11:10 am - 6:25 pm
LHR
-
ORD
13h 15m
1 stop
Lufthansa Logo
3:45 pm - 5:55 am
ORD
-
LHR
8h 10mnonstop
$539Lufthansa
Tue, Feb 24 - Tue, Mar 3
Lufthansa Logo
6:30 am - 1:55 pm
LHR
-
STL
13h 25m
1 stop
Lufthansa Logo
5:41 pm - 10:25 am
STL
-
LHR
11h 44m
1 stop
$580Lufthansa
Sun, Mar 1 - Mon, Mar 9
British Airways Logo
6:45 am - 2:00 pm
LCY
-
ORD
13h 15m
1 stop
British Airways Logo
3:45 pm - 10:20 am
ORD
-
LCY
12h 35m
1 stop
$605British Airways
Fri, May 15 - Sun, May 17
United Airlines Logo
9:00 am - 7:14 pm
LHR
-
STL
16h 14m
2 stops
United Airlines Logo
9:55 am - 6:40 am
STL
-
LHR
14h 45m
2 stops
$605United Airlines
Tue, Feb 24 - Tue, Mar 3
British Airways Logo
6:50 am - 7:15 pm
LCY
-
ORD
18h 25m
1 stop
British Airways Logo
10:28 am - 2:35 pm
ORD
-
LCY
22h 07m
2 stops
$607British Airways
Wed, Feb 18 - Mon, Mar 2
United Airlines Logo
6:30 am - 7:14 pm
LHR
-
STL
18h 44m
2 stops
United Airlines Logo
11:25 am - 6:40 am
STL
-
LHR
14h 15m
2 stops
$611United Airlines
Sun, Mar 1 - Mon, Mar 9

Icelandair flights from London to Illinois

Our best Icelandair deals on London to Illinois flight tickets
Icelandair
Feb 11
LGW11:55 amLondon Gatwick
11h 25m
1 stop
ORD5:20 pmChicago O'Hare Intl
Feb 14
ORD6:30 pmChicago O'Hare Intl
10h 25m
1 stop
LGW10:55 amLondon Gatwick
$528
Icelandair
Feb 25
LGW11:55 amLondon Gatwick
11h 25m
1 stop
ORD5:20 pmChicago O'Hare Intl
Mar 4
ORD6:30 pmChicago O'Hare Intl
10h 25m
1 stop
LGW10:55 amLondon Gatwick
$529
Icelandair
Mar 8
LHR8:35 pmLondon Heathrow
26h 45m
1 stop
ORD6:20 pmChicago O'Hare Intl
Apr 28
ORD7:25 pmChicago O'Hare Intl
18h 55m
1 stop
LHR8:20 pmLondon Heathrow
$530

British Airways flights from London to Illinois

Our best British Airways deals on London to Illinois flight tickets
British Airways
Apr 15
LHR7:40 amLondon Heathrow
12h 20m
1 stop
ORD2:00 pmChicago O'Hare Intl
Apr 26
ORD3:31 pmChicago O'Hare Intl
10h 19m
1 stop
LHR7:50 amLondon Heathrow
$540
British Airways
Apr 17
LHR7:40 amLondon Heathrow
12h 20m
1 stop
ORD2:00 pmChicago O'Hare Intl
Apr 25
ORD9:15 pmChicago O'Hare Intl
8h 00m
LHR11:15 amLondon Heathrow
$541
British Airways
Mar 8
LHR8:50 amLondon Heathrow
11h 10m
1 stop
ORD3:00 pmChicago O'Hare Intl
Mar 18
ORD6:00 pmChicago O'Hare Intl
10h 40m
1 stop
LHR9:40 amLondon Heathrow
$547

momondo Fare Finder

 
Customize your flight search to find flights from London to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from London to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 2/11

11:55 am-5:20 pm

1 stop11h 25m

Chicago O'Hare Intl

Sat 2/14

6:30 pm-10:55 am

1 stop10h 25m

$528

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 2/19

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Mon 2/23

6:30 pm-10:50 am

1 stop10h 20m

$528

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Wed 3/18

1:00 pm-1:02 pm

1 stop29h 02m

Chicago Midway

Mon 3/23

9:51 pm-10:00 am

1 stop31h 09m

$529

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 3/13

6:00 am-3:00 pm

1 stop14h 00m

Chicago O'Hare Intl

Fri 3/20

2:30 pm-10:50 am

1 stop15h 20m

$531

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 2/24

11:10 am-6:25 pm

1 stop13h 15m

Chicago O'Hare Intl

Tue 3/3

3:45 pm-5:55 am

Nonstop8h 10m

$539

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 3/1

6:30 am-1:55 pm

1 stop13h 25m

Lambert-St Louis

Mon 3/9

5:41 pm-10:25 am

1 stop11h 44m

$580

LondonChicago

LCY - ORD

LCYORD

London City

Fri 5/15

6:45 am-2:00 pm

1 stop13h 15m

Chicago O'Hare Intl

Sun 5/17

3:45 pm-10:20 am

1 stop12h 35m

$605

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 2/24

9:00 am-7:14 pm

2 stops16h 14m

Lambert-St Louis

Tue 3/3

9:55 am-6:40 am

2 stops14h 45m

$605

LondonChicago

LCY - ORD

LCYORD

London City

Wed 2/18

6:50 am-7:15 pm

1 stop18h 25m

Chicago O'Hare Intl

Mon 3/2

10:28 am-2:35 pm

2 stops22h 07m

$607

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 3/1

6:30 am-7:14 pm

2 stops18h 44m

Lambert-St Louis

Mon 3/9

11:25 am-6:40 am

2 stops14h 15m

$611

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from London to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from London is in February. Flight prices, which tend to average around $577, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $580.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from London to Illinois is on a Wednesday when prices can be found for as low as $771. Flights from London to Illinois on a Monday will generally be more expensive and average around $878. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the morning. Flights from London to Illinois during this time can be as low as $820. Flights in the afternoon are often more expensive with an average ticket price of $929.

What is the cheapest London to Illinois flight route?

Fly from London Heathrow to Chicago O'Hare Intl for the best London - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $725 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London for as low as $694 on momondo.

What cabin class options are available on London to Illinois flights?

There are 4 cabin classes available to choose from on London to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Illinois flights?

You could potentially save up to 11% on your flight if you consider stops on a London to Illinois flight.

Cheap London to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Illinois

Best Price Found

$616

Fastest flight time

8h 40m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from London in the past 72 hours is $616. The best round-trip flight deal from London to Illinois found on momondo in the last 72 hours is $659.
The fastest flight from London to Illinois takes 8h 40m
Direct flights go from London to Illinois every day.
There are 98 airports in Illinois. From London there are direct flights to Chicago O'Hare Intl (ORD), Lambert-St Louis (STL).
Search flight deals

  • When did momondo last update prices for flights from London to Illinois?

    Prices for flights from London to Illinois refresh daily.

  • How many operators does momondo search for flights from London to Illinois?

  • How old do you have to be to fly from London to Illinois?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from London to Illinois?

Best airlines flying from London to Illinois

Compare and see reviews for airlines that fly from London to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Aer LingusPriceFrom $446Free CancellationRating
7.2
1,443 reviews
Search Aer Lingus flights
IcelandairPriceFrom $453Free CancellationRating
7.1
606 reviews
Search Icelandair flights
United AirlinesPriceFrom $485Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
Austrian AirlinesPriceFrom $530Free CancellationRating
7.5
895 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $550Free CancellationRating
6.7
7,705 reviews
Search British Airways flights
TAP AIR PORTUGALPriceFrom $558Free CancellationRating
7.1
2,130 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $558Free CancellationRating
7.0
3,100 reviews
Search Iberia flights
American AirlinesPriceFrom $572Free CancellationRating
7.2
11,206 reviews
Search American Airlines flights
FinnairPriceFrom $576Free CancellationRating
7.6
1,356 reviews
Search Finnair flights
LufthansaPriceFrom $703Free CancellationRating
6.8
7,756 reviews
Search Lufthansa flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Illinois?

It is quick and easy to find London to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

Can I find flights from London to Illinois with flexible booking policies on momondo?

Flights from London to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from London.

I’m not ready to book a flight from London to Illinois right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Find better results for your trip to Illinois

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