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Cheap flights from Illinois to the United Kingdom from £166

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 15/10. 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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0 bags

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Cheap return flights

Icelandair Logo
19:30 - 09:55ORD-GLA
9h 25m1 stop
Icelandair Logo
14:20 - 18:15GLA-ORD
9h 55m1 stop
£353Icelandair
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Tue, 17 Mar - Tue, 31 Mar
Icelandair Logo
19:30 - 09:55ORD-GLA
9h 25m1 stop
Icelandair Logo
12:35 - 18:20GLA-ORD
10h 45m1 stop
£364Icelandair
Find Deal
Mon, 9 Mar - Mon, 16 Mar
Scandinavian Airlines Logo
20:20 - 08:55ORD-LHR
31h 35m2 stops
Scandinavian Airlines Logo
07:05 - 16:45LHR-ORD
15h 40m2 stops
£378Scandinavian Airlines
Find Deal
Fri, 31 Oct - Mon, 3 Nov
Multiple Airlines Logo
18:58 - 06:20ORD-LGW
29h 22m2 stops
Multiple Airlines Logo
14:00 - 16:23LGW-ORD
31h 23m1 stop
£378Multiple Airlines
Find Deal
Wed, 15 Oct - Fri, 31 Oct
Multiple Airlines Logo
19:10 - 18:00ORD-LHR
16h 50m2 stops
Multiple Airlines Logo
09:55 - 15:00LHR-ORD
35h 05m2 stops
£380Multiple Airlines
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Wed, 5 Nov - Tue, 11 Nov
SWISS Logo
19:05 - 17:55ORD-LGW
16h 50m1 stop
SWISS Logo
18:35 - 15:55LGW-ORD
27h 20m1 stop
£382SWISS
Find Deal
Wed, 8 Oct - Tue, 14 Oct
United Airlines Logo
18:00 - 08:20ORD-LHR
8h 20mdirect
United Airlines Logo
11:05 - 14:10LHR-ORD
9h 05mdirect
£383United Airlines
Find Deal
Mon, 6 Oct - Tue, 14 Oct
SWISS Logo
19:05 - 16:25ORD-LHR
15h 20m1 stop
SWISS Logo
09:00 - 16:20LHR-ORD
13h 20m1 stop
£385SWISS
Find Deal
Sun, 12 Oct - Tue, 4 Nov
Scandinavian Airlines Logo
10:25 - 18:40ORD-LHR
26h 15m2 stops
Scandinavian Airlines Logo
06:40 - 17:45LHR-ORD
16h 05m1 stop
£392Scandinavian Airlines
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Sat, 25 Oct - Sat, 1 Nov
United Airlines Logo
16:05 - 20:35STL-LHR
46h 30m2 stops
United Airlines Logo
06:30 - 13:55LHR-STL
13h 25m1 stop
£432United Airlines
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Fri, 27 Feb - Sun, 8 Mar

United Airlines flights from Illinois to United Kingdom

Our best United Airlines deals on Illinois to United Kingdom flight tickets
United Airlines
6 Oct
ORD18:00Chicago O'Hare Intl
8h 20m
LHR08:20London Heathrow
14 Oct
LHR11:05London Heathrow
9h 05m
ORD14:10Chicago O'Hare Intl
£383
Find similar
United Airlines
27 Feb
STL16:05Lambert-St Louis
46h 30m
2 stops
LHR20:35London Heathrow
8 Mar
LHR06:30London Heathrow
13h 25m
1 stop
STL13:55Lambert-St Louis
£432
Find similar
United Airlines
5 Oct
ORD21:25Chicago O'Hare Intl
8h 20m
LHR11:45London Heathrow
14 Oct
LHR06:55London Heathrow
13h 10m
1 stop
ORD14:05Chicago O'Hare Intl
£441
Find similar

Air Canada flights from Illinois to United Kingdom

Our best Air Canada deals on Illinois to United Kingdom flight tickets
Air Canada
1 Oct
ORD08:40Chicago O'Hare Intl
15h 50m
1 stop
LHR06:30London Heathrow
10 Oct
LHR14:05London Heathrow
30h 43m
1 stop
ORD14:48Chicago O'Hare Intl
£384
Find similar
Air Canada
5 Oct
ORD18:00Chicago O'Hare Intl
8h 20m
LHR08:20London Heathrow
14 Oct
LHR08:30London Heathrow
9h 00m
ORD11:30Chicago O'Hare Intl
£468
Find similar
Air Canada
26 Oct
STL16:05Lambert-St Louis
14h 15m
1 stop
LHR11:20London Heathrow
7 Nov
LHR13:25London Heathrow
32h 21m
2 stops
STL15:46Lambert-St Louis
£542
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 23 September 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

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Tue 17/3

19:30-09:55

1 stop9h 25m

Glasgow Intl

Tue 31/3

14:20-18:15

1 stop9h 55m

£353

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Mon 9/3

19:30-09:55

1 stop9h 25m

Glasgow Intl

Mon 16/3

12:35-18:20

1 stop10h 45m

£364

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 31/10

20:20-08:55

2 stops31h 35m

London Heathrow

Mon 3/11

07:05-16:45

2 stops15h 40m

£378

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 15/10

18:58-06:20

2 stops29h 22m

London Gatwick

Fri 31/10

14:00-16:23

1 stop31h 23m

£378

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 5/11

19:10-18:00

2 stops16h 50m

London Heathrow

Tue 11/11

09:55-15:00

2 stops35h 05m

£380

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 8/10

19:05-17:55

1 stop16h 50m

London Gatwick

Tue 14/10

18:35-15:55

1 stop27h 20m

£382

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 6/10

18:00-08:20

Nonstop8h 20m

London Heathrow

Tue 14/10

11:05-14:10

Nonstop9h 05m

£383

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 12/10

19:05-16:25

1 stop15h 20m

London Heathrow

Tue 4/11

09:00-16:20

1 stop13h 20m

£385

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 25/10

10:25-18:40

2 stops26h 15m

London Heathrow

Sat 1/11

06:40-17:45

1 stop16h 05m

£392

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 27/2

16:05-20:35

2 stops46h 30m

London Heathrow

Sun 8/3

06:30-13:55

1 stop13h 25m

£432

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 £482, 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 September is also very affordable. Most momondo users find prices during this month for around £488.

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 Thursday. Travellers who choose to depart for United Kingdom on a Thursday will often find tickets for as low as £511. 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 £663.

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 morning when flights can be purchased for as low as £486. Try not to purchase tickets at midday because they tend to be around £692. 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 £588 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 £514 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 36% 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

£277

Fastest flight time

7h 40m

Direct flights

Every day

Airports in United Kingdom

2 airports
The best one-way flight to United Kingdom from Illinois in the past 72 hours is £277. The best return flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is £370.
The fastest flight from Illinois to United Kingdom takes 7h 40m
Direct flights go from Illinois to United Kingdom every day.
There are 2 airports near United Kingdom: London Heathrow (LHR), Edinburgh Turnhouse (EDI)
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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 £351Free CancellationRating
7.0
545 reviews
Search Icelandair flights
LufthansaPriceFrom £356Free CancellationRating
6.8
7,421 reviews
Search Lufthansa flights
American AirlinesPriceFrom £384Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
FinnairPriceFrom £412Free CancellationRating
7.6
1,326 reviews
Search Finnair flights
Aer LingusPriceFrom £425Free CancellationRating
7.2
1,296 reviews
Search Aer Lingus flights
British AirwaysPriceFrom £427Free CancellationRating
6.7
7,391 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £429Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
IberiaPriceFrom £444Free CancellationRating
7.0
2,943 reviews
Search Iberia flights
United AirlinesPriceFrom £460Free CancellationRating
7.4
8,926 reviews
Search United 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.
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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
Flights to Londonfrom £30
Flights to Manchesterfrom £30
Flights to Birminghamfrom £36
Flights to Edinburghfrom £30
Flights to Belfastfrom £29
Flights to Glasgowfrom £36
Flights to Bristolfrom £46
Flights to Newcastle upon Tynefrom £32
Flights to Aberdeenfrom £49
Flights to Liverpoolfrom £30
Flights to Leedsfrom £60
Flights to Invernessfrom £37