Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from London to Illinois from £188

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 2/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from London to Illinois

Cheap return flights

Brussels Airlines Logo
17:50 - 12:55LHR-ORD
25h 05m2 stops
Brussels Airlines Logo
17:55 - 17:05ORD-LHR
17h 10m1 stop
£308Brussels Airlines
Find Deal
Mon, 15 Sep - Mon, 22 Sep
Logo
14:00 - 16:12LGW-ORD
32h 12m1 stop
Logo
17:17 - 10:00ORD-LGW
34h 43m1 stop
£309
Find Deal
Wed, 10 Sep - Sun, 21 Sep
Icelandair Logo
15:40 - 21:15LGW-ORD
11h 35m1 stop
Icelandair Logo
19:25 - 11:45ORD-LGW
10h 20m1 stop
£347Icelandair
Find Deal
Fri, 29 Aug - Fri, 5 Sep
Icelandair Logo
15:40 - 21:15LGW-ORD
11h 35m1 stop
Icelandair Logo
19:25 - 14:40ORD-LGW
13h 15m1 stop
£348Icelandair
Find Deal
Thu, 11 Sep - Tue, 23 Sep
Aer Lingus Logo
07:40 - 14:00LHR-ORD
12h 20m1 stop
Aer Lingus Logo
21:15 - 13:25ORD-LHR
10h 10m1 stop
£358Aer Lingus
Find Deal
Sat, 20 Sep - Sat, 11 Oct
Aer Lingus Logo
13:25 - 19:00LHR-ORD
11h 35m1 stop
Aer Lingus Logo
21:15 - 13:25ORD-LHR
10h 10m1 stop
£360Aer Lingus
Find Deal
Fri, 19 Sep - Sun, 12 Oct
Lufthansa Logo
10:30 - 19:55LHR-ORD
15h 25m1 stop
Lufthansa Logo
22:30 - 18:40ORD-LHR
14h 10m1 stop
£374Lufthansa
Find Deal
Wed, 17 Sep - Sun, 28 Sep
Lufthansa Logo
13:30 - 20:05LHR-ORD
12h 35m1 stop
Lufthansa Logo
22:35 - 17:50ORD-LHR
13h 15m1 stop
£378Lufthansa
Find Deal
Fri, 14 Nov - Sun, 23 Nov
Finnair Logo
14:00 - 15:37LGW-STL
31h 37m2 stops
Finnair Logo
18:55 - 08:10STL-LGW
31h 15m2 stops
£671Finnair
Find Deal
Mon, 15 Sep - Mon, 22 Sep
Finnair Logo
12:15 - 19:22LHR-STL
13h 07m1 stop
Finnair Logo
16:55 - 10:20STL-LHR
11h 25m1 stop
£702Finnair
Find Deal
Mon, 15 Sep - Mon, 22 Sep

Austrian Airlines flights from London to Illinois

Our best Austrian Airlines deals on London to Illinois flight tickets
Austrian Airlines
9 Aug
LHR08:30London Heathrow
8h 55m
ORD11:25Chicago O'Hare Intl
16 Aug
ORD16:05Chicago O'Hare Intl
8h 15m
LHR06:20London Heathrow
£506
Find similar
Austrian Airlines
9 Aug
LHR14:10London Heathrow
9h 10m
ORD17:20Chicago O'Hare Intl
15 Aug
ORD13:05Chicago O'Hare Intl
11h 50m
1 stop
LHR06:55London Heathrow
£509
Find similar
Austrian Airlines
8 Aug
LHR14:10London Heathrow
9h 10m
ORD17:20Chicago O'Hare Intl
10 Aug
ORD16:20Chicago O'Hare Intl
35h 20m
1 stop
LHR09:40London Heathrow
£522
Find similar

United Airlines flights from London to Illinois

Our best United Airlines deals on London to Illinois flight tickets
United Airlines
13 Sept
LHR06:50London Heathrow
11h 15m
1 stop
ORD12:05Chicago O'Hare Intl
13 Sept
ORD18:00Chicago O'Hare Intl
30h 30m
1 stop
LHR06:30London Heathrow
£398
Find similar
United Airlines
9 Aug
LHR11:05London Heathrow
9h 05m
ORD14:10Chicago O'Hare Intl
9 Aug
ORD20:25Chicago O'Hare Intl
31h 10m
1 stop
LHR09:35London Heathrow
£450
Find similar
United Airlines
9 Aug
LHR08:30London Heathrow
8h 55m
ORD11:25Chicago O'Hare Intl
15 Aug
ORD16:05Chicago O'Hare Intl
8h 15m
LHR06:20London Heathrow
£508
Find similar

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 2 August 2025.
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

LHR - ORD

LHRORD

London Heathrow

Mon 15/9

17:50-12:55

2 stops25h 05m

Chicago O'Hare Intl

Mon 22/9

17:55-17:05

1 stop17h 10m

£308

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 10/9

14:00-16:12

1 stop32h 12m

Chicago O'Hare Intl

Sun 21/9

17:17-10:00

1 stop34h 43m

£309

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 29/8

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Fri 5/9

19:25-11:45

1 stop10h 20m

£347

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 11/9

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Tue 23/9

19:25-14:40

1 stop13h 15m

£348

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 20/9

07:40-14:00

1 stop12h 20m

Chicago O'Hare Intl

Sat 11/10

21:15-13:25

1 stop10h 10m

£358

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 19/9

13:25-19:00

1 stop11h 35m

Chicago O'Hare Intl

Sun 12/10

21:15-13:25

1 stop10h 10m

£360

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 17/9

10:30-19:55

1 stop15h 25m

Chicago O'Hare Intl

Sun 28/9

22:30-18:40

1 stop14h 10m

£374

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 14/11

13:30-20:05

1 stop12h 35m

Chicago O'Hare Intl

Sun 23/11

22:35-17:50

1 stop13h 15m

£378

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 15/9

14:00-15:37

2 stops31h 37m

Lambert-St Louis

Mon 22/9

18:55-08:10

2 stops31h 15m

£671

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 15/9

12:15-19:22

1 stop13h 07m

Lambert-St Louis

Mon 22/9

16:55-10:20

1 stop11h 25m

£702

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 month of February is, on average, the cheapest month to fly to Illinois from London, with most prices found around £439. If you aren’t able to travel to Illinois during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of £459.

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

The cheapest day to depart on your flight to Illinois is on a Wednesday when prices can be found for as low as £614. This is often the case because there is less demand to fly during this day of the week. Flights from London to Illinois on a Sunday will generally be more expensive and average around £678. 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 data shows that the cheapest London to Illinois flights are usually those with departure times in the evening. Our users have found flights to Illinois in the evening for as low as £565. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £678 per ticket.

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 £558 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London for as low as £525 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?

No. A direct flight is the cheapest option for a flight between London to Illinois.

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

£188

Fastest flight time

9h 00m

Direct flights

Every day

Airports in Illinois

3 airports
The best one-way flight to Illinois from London in the past 72 hours is £188. The best return flight deal from London to Illinois found on momondo in the last 72 hours is £308.
The fastest flight from London to Illinois takes 9h 00m
Direct flights go from London to Illinois every day.
There are 3 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), 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 are refreshed on a daily basis.

  • 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
IcelandairPriceFrom £317Free CancellationRating
7.0
520 reviews
Search Icelandair flights
Scandinavian AirlinesPriceFrom £359Free CancellationRating
7.3
1,457 reviews
Search Scandinavian Airlines flights
TAP AIR PORTUGALPriceFrom £374Free CancellationRating
7.1
1,936 reviews
Search TAP AIR PORTUGAL flights
Virgin AtlanticPriceFrom £388Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic flights
Brussels AirlinesPriceFrom £400Free CancellationRating
7.2
350 reviews
Search Brussels Airlines flights
LufthansaPriceFrom £404Free CancellationRating
6.8
7,276 reviews
Search Lufthansa flights
Austrian AirlinesPriceFrom £410Free CancellationRating
7.6
823 reviews
Search Austrian Airlines flights
United AirlinesPriceFrom £414Free CancellationRating
7.4
8,904 reviews
Search United Airlines flights
British AirwaysPriceFrom £415Free CancellationRating
6.6
7,224 reviews
Search British Airways flights
KLMPriceFrom £423Free CancellationRating
7.8
1,384 reviews
Search KLM flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Illinois for you.

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

All flight searches from London to Illinois on momondo can be filtered to show those which offer flexible booking policies.

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?

Yes. momondo can track prices for London to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Illinois trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 7/8
Thu 14/8
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Illinois

Popular Cities in Illinois

Popular flights according to clicks in the last 7 days on momondo
Flights to New Yorkfrom £243
Flights to Orlandofrom £230
Flights to Los Angelesfrom £252
Flights to Miamifrom £234
Flights to San Franciscofrom £342
Flights to Bostonfrom £319
Flights to Las Vegasfrom £346
Flights to Chicagofrom £323
Flights to Washington, D.C.from £327
Flights to Atlantafrom £337
Flights to Dallasfrom £344
Flights to Houstonfrom £312