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Cheap flights from Illinois to the United Kingdom from £140

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to the United Kingdom departing on 8/10. 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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Cheap return flights

Scandinavian Airlines Logo
19:20 - 16:25ORD-LHR
15h 05m2 stops
Scandinavian Airlines Logo
10:20 - 16:45LHR-ORD
12h 25m1 stop
£318Scandinavian Airlines
Find Deal
Fri, 7 Nov - Sun, 9 Nov
Scandinavian Airlines Logo
19:20 - 18:30ORD-LHR
17h 10m2 stops
Scandinavian Airlines Logo
09:55 - 16:45LHR-ORD
36h 50m2 stops
£322Scandinavian Airlines
Find Deal
Fri, 7 Nov - Sun, 9 Nov
Logo
10:40 - 12:00ORD-STN
19h 20m2 stops
Logo
21:45 - 20:22STN-ORD
28h 37m2 stops
£343
Find Deal
Tue, 14 Oct - Tue, 21 Oct
Logo
10:40 - 11:50ORD-STN
19h 10m2 stops
Logo
06:30 - 20:22STN-ORD
19h 52m2 stops
£348
Find Deal
Sun, 12 Oct - Wed, 22 Oct
Lufthansa Logo
12:50 - 06:55ORD-LHR
12h 05m1 stop
Lufthansa Logo
06:50 - 12:05LHR-ORD
11h 15m1 stop
£351Lufthansa
Find Deal
Sun, 21 Sep - Tue, 30 Sep
Virgin Atlantic Logo
13:25 - 10:00ORD-LGW
14h 35m1 stop
Virgin Atlantic Logo
12:00 - 21:47LGW-ORD
15h 47m1 stop
£352Virgin Atlantic
Find Deal
Mon, 18 Aug - Tue, 2 Sep
Icelandair Logo
22:15 - 14:40ORD-LGW
10h 25m1 stop
Icelandair Logo
15:40 - 18:15LGW-ORD
32h 35m1 stop
£356Icelandair
Find Deal
Sun, 21 Sep - Sun, 28 Sep
Icelandair Logo
22:15 - 14:40ORD-LGW
10h 25m1 stop
Icelandair Logo
15:40 - 18:15LGW-ORD
32h 35m1 stop
£357Icelandair
Find Deal
Sun, 12 Oct - Wed, 22 Oct
Lufthansa Logo
16:00 - 06:20ORD-LHR
8h 20mdirect
Lufthansa Logo
11:05 - 14:10LHR-ORD
9h 05mdirect
£359Lufthansa
Find Deal
Sun, 21 Sep - Tue, 30 Sep
Virgin Atlantic Logo
13:26 - 13:30STL-LHR
18h 04m1 stop
Virgin Atlantic Logo
12:45 - 23:24LHR-STL
16h 39m1 stop
£369Virgin Atlantic
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Wed, 20 Aug - Wed, 27 Aug

Virgin Atlantic flights from Illinois to United Kingdom

Our best Virgin Atlantic deals on Illinois to United Kingdom flight tickets
Virgin Atlantic
18 Aug
ORD13:25Chicago O'Hare Intl
14h 35m
1 stop
LGW10:00London Gatwick
2 Sept
LGW12:00London Gatwick
15h 47m
1 stop
ORD21:47Chicago O'Hare Intl
£352
Find similar
Virgin Atlantic
20 Aug
STL13:26Lambert-St Louis
18h 04m
1 stop
LHR13:30London Heathrow
27 Aug
LHR12:45London Heathrow
16h 39m
1 stop
STL23:24Lambert-St Louis
£369
Find similar
Virgin Atlantic
26 Aug
ORD11:15Chicago O'Hare Intl
16h 45m
2 stops
LGW10:00London Gatwick
5 Sept
LGW12:00London Gatwick
16h 37m
2 stops
ORD22:37Chicago O'Hare Intl
£372
Find similar

United Airlines flights from Illinois to United Kingdom

Our best United Airlines deals on Illinois to United Kingdom flight tickets
United Airlines
17 Aug
ORD18:05Chicago O'Hare Intl
8h 15m
LHR08:20London Heathrow
26 Aug
LHR07:25London Heathrow
12h 35m
1 stop
ORD14:00Chicago O'Hare Intl
£373
Find similar
United Airlines
14 Oct
STL13:30Lambert-St Louis
14h 05m
1 stop
LHR09:35London Heathrow
22 Oct
LHR14:05London Heathrow
26h 44m
2 stops
STL10:49Lambert-St Louis
£374
Find similar
United Airlines
28 Oct
ORD16:45Chicago O'Hare Intl
8h 10m
LHR05:55London Heathrow
11 Nov
LHR12:05London Heathrow
34h 15m
1 stop
ORD16:20Chicago O'Hare Intl
£375
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Illinois to United Kingdom 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 8 August 2025.
Use the filters below to find and compare flights from Illinois to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 7/11

19:20-16:25

2 stops15h 05m

London Heathrow

Sun 9/11

10:20-16:45

1 stop12h 25m

£318

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 7/11

19:20-18:30

2 stops17h 10m

London Heathrow

Sun 9/11

09:55-16:45

2 stops36h 50m

£322

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 14/10

10:40-12:00

2 stops19h 20m

London Stansted

Tue 21/10

21:45-20:22

2 stops28h 37m

£343

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sun 12/10

10:40-11:50

2 stops19h 10m

London Stansted

Wed 22/10

06:30-20:22

2 stops19h 52m

£348

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 21/9

12:50-06:55

1 stop12h 05m

London Heathrow

Tue 30/9

06:50-12:05

1 stop11h 15m

£351

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 18/8

13:25-10:00

1 stop14h 35m

London Gatwick

Tue 2/9

12:00-21:47

1 stop15h 47m

£352

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 21/9

22:15-14:40

1 stop10h 25m

London Gatwick

Sun 28/9

15:40-18:15

1 stop32h 35m

£356

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 12/10

22:15-14:40

1 stop10h 25m

London Gatwick

Wed 22/10

15:40-18:15

1 stop32h 35m

£357

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 21/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Tue 30/9

11:05-14:10

Nonstop9h 05m

£359

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 20/8

13:26-13:30

1 stop18h 04m

London Heathrow

Wed 27/8

12:45-23:24

1 stop16h 39m

£369

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to the United Kingdom from

How to get the cheapest flight ticket from Illinois to United Kingdom

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 United Kingdom?

The cheapest month to fly to United Kingdom from Illinois is in February. Flight prices, which tend to average around £484, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom during the month of February, then departing from Illinois during the month January is also very affordable. Most momondo users find prices during this month for around £497.

What is the cheapest day to depart on your flight to United Kingdom?

The cheapest day to depart from Illinois to United Kingdom is on a Wednesday. Travellers who choose to depart for United Kingdom on a Wednesday will often find tickets for as low as £531. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to United Kingdom for around £668.

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

The cheapest time of day to fly to United Kingdom is in the evening when flights can be purchased for as low as £590. Try not to purchase tickets at midday because they tend to be around £697. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Illinois to United Kingdom flight route?

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

How far in advance should I book a flight to United Kingdom?

You are more likely to see cheaper flights to United Kingdom from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around £593 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from Illinois for as low as £525 on momondo.

What cabin class options are available on Illinois to United Kingdom flights?

There are 4 cabin classes available to choose from on Illinois to United Kingdom 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 Illinois to United Kingdom flights?

You could potentially save up to 52% on your flight if you consider stops on a Illinois to United Kingdom flight.

Cheap Illinois to United Kingdom flight deals and tips

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

Best price found

£140

Fastest flight time

7h 40m

Direct flights

Every day

Airports in United Kingdom

5 airports
The best one-way flight to United Kingdom from Illinois in the past 72 hours is £140. The best return flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is £318.
The fastest flight from Illinois to United Kingdom takes 7h 40m
Direct flights go from Illinois to United Kingdom every day.
There are 5 airports near United Kingdom: London City (LCY), London Heathrow (LHR), London Stansted (STN), London Gatwick (LGW), Glasgow Intl (GLA)
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  • When did momondo last update prices for flights from Illinois to United Kingdom?

    Prices for flights from Illinois to United Kingdom are refreshed on a daily basis.

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

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

    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 Illinois to United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The required travel and health documents for your United Kingdom 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 United Kingdom. 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 Illinois to United Kingdom?

Best airlines flying from Illinois to United Kingdom

Compare and see reviews for airlines that fly from Illinois to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom £298Free CancellationRating
7.0
524 reviews
Search Icelandair flights
British AirwaysPriceFrom £329Free CancellationRating
6.6
7,251 reviews
Search British Airways flights
Aer LingusPriceFrom £412Free CancellationRating
7.1
1,202 reviews
Search Aer Lingus flights
Virgin AtlanticPriceFrom £414Free CancellationRating
7.4
657 reviews
Search Virgin Atlantic flights
FinnairPriceFrom £415Free CancellationRating
7.6
1,319 reviews
Search Finnair flights
LufthansaPriceFrom £435Free CancellationRating
6.8
7,296 reviews
Search Lufthansa flights
IberiaPriceFrom £447Free CancellationRating
7.0
2,866 reviews
Search Iberia flights
United AirlinesPriceFrom £463Free CancellationRating
7.4
8,916 reviews
Search United Airlines flights
American AirlinesPriceFrom £567Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Why use momondo?

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

Finding the right flight to United Kingdom from Illinois is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to United Kingdom quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to United Kingdom from Illinois which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Illinois to United Kingdom?

momondo helps you find the best flight between Illinois and United Kingdom by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are simply researching potential flights to United Kingdom, momondo offers a useful price alert feature which will track prices for flights to United Kingdom from Illinois and alert you when they change.

An easier way to manage your United Kingdom 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
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Find better results for your trip to the United Kingdom

Popular Cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
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Flights to Aberdeenfrom £51
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Flights to Leedsfrom £34
Flights to Invernessfrom £35