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Cheap flights from Illinois to the United Kingdom from £173

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 26/3. 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

Enter your travel dates to find the best prices.
Icelandair Logo
19:25 - 13:35
ORD
-
GLA
12h 10m
1 stop
Icelandair Logo
14:30 - 21:25
GLA
-
ORD
12h 55m
1 stop
£380Icelandair
Sat, 4 Apr - Fri, 10 Apr
Icelandair Logo
19:25 - 13:25
ORD
-
GLA
12h 00m
1 stop
Icelandair Logo
14:20 - 18:15
GLA
-
ORD
9h 55m
1 stop
£392Icelandair
Sun, 3 May - Thu, 7 May
Multiple Airlines Logo
19:25 - 00:20
ORD
-
EDI
22h 55m
2 stops
Multiple Airlines Logo
10:55 - 21:25
EDI
-
ORD
16h 30m
2 stops
£394Multiple Airlines
Fri, 1 May - Wed, 6 May
Icelandair Logo
22:25 - 13:25
ORD
-
GLA
9h 00m
1 stop
Icelandair Logo
14:20 - 18:15
GLA
-
ORD
9h 55m
1 stop
£398Icelandair
Tue, 25 Aug - Sat, 5 Sep
Multiple Airlines Logo
19:25 - 17:30
ORD
-
EDI
16h 05m
2 stops
Multiple Airlines Logo
06:15 - 18:15
EDI
-
ORD
18h 00m
2 stops
£406Multiple Airlines
Mon, 13 Apr - Tue, 21 Apr
TAP AIR PORTUGAL Logo
21:25 - 21:35
ORD
-
LHR
19h 10m
1 stop
TAP AIR PORTUGAL Logo
19:50 - 16:00
LHR
-
ORD
26h 10m
1 stop
£414TAP AIR PORTUGAL
Sun, 22 Mar - Tue, 31 Mar
Scandinavian Airlines Logo
19:15 - 09:35
ORD
-
LHR
56h 20m
2 stops
Scandinavian Airlines Logo
06:40 - 16:10
LHR
-
ORD
39h 30m
2 stops
£415Scandinavian Airlines
Wed, 22 Apr - Sun, 26 Apr
Scandinavian Airlines Logo
20:20 - 18:30
ORD
-
LHR
17h 10m
1 stop
Scandinavian Airlines Logo
10:20 - 17:45
LHR
-
ORD
12h 25m
1 stop
£419Scandinavian Airlines
Mon, 16 Mar - Thu, 19 Mar
SWISS Logo
14:20 - 08:40
ORD
-
LCY
12h 20m
1 stop
SWISS Logo
09:15 - 15:55
LCY
-
ORD
12h 40m
1 stop
£477SWISS
Wed, 12 Aug - Tue, 15 Sep
SWISS Logo
19:05 - 17:25
ORD
-
LCY
16h 20m
1 stop
SWISS Logo
19:15 - 15:55
LCY
-
ORD
26h 40m
1 stop
£480SWISS
Sun, 16 Aug - Mon, 24 Aug

Delta flights from Illinois to United Kingdom

Our best Delta deals on Illinois to United Kingdom flight tickets
Delta
4 Mar
ORD11:18Chicago O'Hare Intl
13h 07m
1 stop
LHR06:25London Heathrow
11 Mar
LHR10:00London Heathrow
16h 49m
2 stops
ORD21:49Chicago O'Hare Intl
£493
Delta
24 Mar
STL17:59Lambert-St Louis
14h 46m
2 stops
LHR13:45London Heathrow
31 Mar
LHR11:30London Heathrow
18h 28m
2 stops
STL23:58Lambert-St Louis
£501
Delta
6 May
MDW13:24Chicago Midway
11h 46m
1 stop
LHR07:10London Heathrow
12 May
LHR08:40London Heathrow
15h 53m
2 stops
MDW18:33Chicago Midway
£503

United Airlines flights from Illinois to United Kingdom

Our best United Airlines deals on Illinois to United Kingdom flight tickets
United Airlines
4 Mar
ORD15:45Chicago O'Hare Intl
8h 10m
LHR05:55London Heathrow
11 Mar
LHR06:50London Heathrow
11h 20m
1 stop
ORD13:10Chicago O'Hare Intl
£481
United Airlines
4 Mar
ORD17:50Chicago O'Hare Intl
8h 05m
LHR07:55London Heathrow
11 Mar
LHR06:50London Heathrow
11h 20m
1 stop
ORD13:10Chicago O'Hare Intl
£482
United Airlines
10 Mar
ORD15:35Chicago O'Hare Intl
10h 35m
1 stop
LHR07:10London Heathrow
17 Mar
LHR06:50London Heathrow
11h 20m
1 stop
ORD13:10Chicago O'Hare Intl
£484

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 3 March 2026.
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

Sat 4/4

19:25-13:35

1 stop12h 10m

Glasgow Intl

Fri 10/4

14:30-21:25

1 stop12h 55m

£380

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Sun 3/5

19:25-13:25

1 stop12h 00m

Glasgow Intl

Thu 7/5

14:20-18:15

1 stop9h 55m

£392

ChicagoEdinburgh

ORD - EDI

ORDEDI

Chicago O'Hare Intl

Fri 1/5

19:25-00:20

2 stops22h 55m

Edinburgh Turnhouse

Wed 6/5

10:55-21:25

2 stops16h 30m

£394

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Tue 25/8

22:25-13:25

1 stop9h 00m

Glasgow Intl

Sat 5/9

14:20-18:15

1 stop9h 55m

£398

ChicagoEdinburgh

ORD - EDI

ORDEDI

Chicago O'Hare Intl

Mon 13/4

19:25-17:30

2 stops16h 05m

Edinburgh Turnhouse

Tue 21/4

06:15-18:15

2 stops18h 00m

£406

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 22/3

21:25-21:35

1 stop19h 10m

London Heathrow

Tue 31/3

19:50-16:00

1 stop26h 10m

£414

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/4

19:15-09:35

2 stops56h 20m

London Heathrow

Sun 26/4

06:40-16:10

2 stops39h 30m

£415

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 16/3

20:20-18:30

1 stop17h 10m

London Heathrow

Thu 19/3

10:20-17:45

1 stop12h 25m

£419

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Wed 12/8

14:20-08:40

1 stop12h 20m

London City

Tue 15/9

09:15-15:55

1 stop12h 40m

£477

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 16/8

19:05-17:25

1 stop16h 20m

London City

Mon 24/8

19:15-15:55

1 stop26h 40m

£480

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 September. Flight prices, which tend to average around £489, 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 September, then departing from Illinois during the month October is also very affordable. Most momondo users find prices during this month for around £489.

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 Sunday. Travellers who choose to depart for United Kingdom on a Sunday will often find tickets for as low as £506. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to United Kingdom for around £672.

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 £570. Try not to purchase tickets in the afternoon because they tend to be around £611. 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 £585 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 £518 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 51% 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

£293

Fastest flight time

7h 45m

Direct flights

Every day

Airports in United Kingdom

1,286 airports
The best one-way flight to United Kingdom from Illinois in the past 72 hours is £293. The best return flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is £541.
The fastest flight from Illinois to United Kingdom takes 7h 45m
Direct flights go from Illinois to United Kingdom every day.
There are 1,286 airports in United Kingdom. From Illinois there are direct flights to London Heathrow (LHR), Edinburgh Turnhouse (EDI).
Search flight deals

  • 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 £340Free CancellationRating
7.1
617 reviews
Search Icelandair flights
Aer LingusPriceFrom £342Free CancellationRating
7.2
1,464 reviews
Search Aer Lingus flights
LufthansaPriceFrom £359Free CancellationRating
6.8
7,821 reviews
Search Lufthansa flights
British AirwaysPriceFrom £385Free CancellationRating
6.7
7,773 reviews
Search British Airways flights
American AirlinesPriceFrom £386Free CancellationRating
7.1
11,376 reviews
Search American Airlines flights
FinnairPriceFrom £415Free CancellationRating
7.6
1,371 reviews
Search Finnair flights
United AirlinesPriceFrom £463Free CancellationRating
7.4
9,378 reviews
Search United Airlines flights
IberiaPriceFrom £476Free CancellationRating
7.0
3,130 reviews
Search Iberia 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 £31
Flights to Manchesterfrom £31
Flights to Birminghamfrom £34
Flights to Edinburghfrom £31
Flights to Belfastfrom £28
Flights to Glasgowfrom £32
Flights to Bristolfrom £37
Flights to Newcastle upon Tynefrom £31
Flights to Liverpoolfrom £23
Flights to Aberdeenfrom £40
Flights to Leedsfrom £44
Flights to Invernessfrom £40