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Cheap flights from Illinois to the United Kingdom from £164

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 19/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to the United Kingdom

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
22:25 - 20:55
ORD
-
LTN
16h 30m
2 stops
Multiple Airlines Logo
21:30 - 15:30
LTN
-
ORD
24h 00m
2 stops
£520Multiple Airlines
Mon, 24 Aug - Tue, 24 Nov
Multiple Airlines Logo
22:25 - 14:40
ORD
-
LGW
10h 15m
1 stop
Multiple Airlines Logo
14:00 - 23:55
LGW
-
ORD
15h 55m
1 stop
£521Multiple Airlines
Mon, 7 Sep - Wed, 9 Sep
Scandinavian Airlines Logo
19:15 - 17:40
ORD
-
LHR
16h 25m
1 stop
Scandinavian Airlines Logo
06:40 - 16:10
LHR
-
ORD
15h 30m
1 stop
£521Scandinavian Airlines
Mon, 21 Sep - Sat, 3 Oct
Icelandair Logo
18:30 - 19:30
ORD
-
LHR
19h 00m
1 stop
Icelandair Logo
20:35 - 17:20
LHR
-
ORD
26h 45m
1 stop
£522Icelandair
Sun, 15 Nov - Fri, 20 Nov
Icelandair Logo
18:30 - 10:55
ORD
-
LGW
10h 25m
1 stop
Icelandair Logo
11:55 - 17:20
LGW
-
ORD
11h 25m
1 stop
£522Icelandair
Sun, 8 Nov - Sun, 22 Nov
Icelandair Logo
19:25 - 11:55
ORD
-
LHR
10h 30m
1 stop
Icelandair Logo
13:05 - 21:25
LHR
-
ORD
14h 20m
1 stop
£523Icelandair
Sat, 3 Oct - Sun, 11 Oct
SWISS Logo
19:50 - 12:50
ORD
-
LCY
12h 00m
1 stop
SWISS Logo
09:15 - 16:20
LCY
-
ORD
13h 05m
1 stop
£624SWISS
Tue, 27 Oct - Tue, 3 Nov
SWISS Logo
19:50 - 12:50
ORD
-
LCY
12h 00m
1 stop
SWISS Logo
09:15 - 16:20
LCY
-
ORD
13h 05m
1 stop
£625SWISS
Wed, 28 Oct - Tue, 3 Nov
Virgin Atlantic Logo
16:20 - 08:50
ORD
-
LCY
10h 30m
1 stop
Virgin Atlantic Logo
09:20 - 14:30
LCY
-
ORD
11h 10m
1 stop
£629Virgin Atlantic
Sun, 23 Aug - Wed, 2 Sep
Virgin Atlantic Logo
13:19 - 07:10
MDW
-
LHR
11h 51m
1 stop
Virgin Atlantic Logo
09:20 - 16:15
LHR
-
MDW
12h 55m
1 stop
£631Virgin Atlantic
Mon, 28 Sep - Sun, 4 Oct

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Air France flights from Illinois to United Kingdom

Our best Air France deals on Illinois to United Kingdom flight tickets
Air France
1 Dec
MDW13:22Chicago Midway
12h 23m
1 stop
LHR07:45London Heathrow
4 Dec
LHR08:55London Heathrow
13h 19m
1 stop
MDW16:14Chicago Midway
£671
Air France
22 Sept
MDW13:00Chicago Midway
11h 25m
1 stop
LHR06:25London Heathrow
2 Oct
LHR09:20London Heathrow
12h 56m
1 stop
MDW16:16Chicago Midway
£678
Air France
6 Aug
MDW13:25Chicago Midway
11h 45m
1 stop
LHR07:10London Heathrow
22 Aug
LHR15:15London Heathrow
13h 21m
1 stop
MDW22:36Chicago Midway
£893

Icelandair flights from Illinois to United Kingdom

Our best Icelandair deals on Illinois to United Kingdom flight tickets
Icelandair
15 Nov
ORD18:30Chicago O'Hare Intl
19h 00m
1 stop
LHR19:30London Heathrow
20 Nov
LHR20:35London Heathrow
26h 45m
1 stop
ORD17:20Chicago O'Hare Intl
£522
Icelandair
3 Oct
ORD19:25Chicago O'Hare Intl
10h 30m
1 stop
LHR11:55London Heathrow
11 Oct
LHR13:05London Heathrow
14h 20m
1 stop
ORD21:25Chicago O'Hare Intl
£523
Icelandair
7 Oct
ORD22:25Chicago O'Hare Intl
15h 55m
1 stop
LHR20:20London Heathrow
13 Oct
LHR13:05London Heathrow
11h 10m
1 stop
ORD18:15Chicago O'Hare Intl
£524

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 26 July 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

Cheapest return flight

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Mon 24/8

22:25-20:55

2 stops16h 30m

London Luton

Tue 24/11

21:30-15:30

2 stops24h 00m

£520

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 7/9

22:25-14:40

1 stop10h 15m

London Gatwick

Wed 9/9

14:00-23:55

1 stop15h 55m

£521

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 21/9

19:15-17:40

1 stop16h 25m

London Heathrow

Sat 3/10

06:40-16:10

1 stop15h 30m

£521

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 15/11

18:30-19:30

1 stop19h 00m

London Heathrow

Fri 20/11

20:35-17:20

1 stop26h 45m

£522

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 8/11

18:30-10:55

1 stop10h 25m

London Gatwick

Sun 22/11

11:55-17:20

1 stop11h 25m

£522

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 3/10

19:25-11:55

1 stop10h 30m

London Heathrow

Sun 11/10

13:05-21:25

1 stop14h 20m

£523

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Tue 27/10

19:50-12:50

1 stop12h 00m

London City

Tue 3/11

09:15-16:20

1 stop13h 05m

£624

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Wed 28/10

19:50-12:50

1 stop12h 00m

London City

Tue 3/11

09:15-16:20

1 stop13h 05m

£625
Fastest return journey

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 23/8

16:20-08:50

1 stop10h 30m

London City

Wed 2/9

09:20-14:30

1 stop11h 10m

£629

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 28/9

13:19-07:10

1 stop11h 51m

London Heathrow

Sun 4/10

09:20-16:15

1 stop12h 55m

£631

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 January. Flight prices, which tend to average around £487, 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 January, then departing from Illinois during the month February is also very affordable. Most momondo users find prices during this month for around £510.

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 Monday. Travellers who choose to depart for United Kingdom on a Monday will often find tickets for as low as £541. 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 £875.

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 £697. Try not to purchase tickets in the afternoon because they tend to be around £786. 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 from Illinois to the United Kingdom?

You are more likely to see cheaper flights to United Kingdom from Illinois when booking week ahead of your departure date. In general, you can expect to find flights to United Kingdom for around £627 when searching week 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 £595 on momondo.

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

There are 3 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 35% 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

£280

Fastest flight time

7h 45m

Direct flights

Every day

Airports in United Kingdom

1,285 airports
The best one-way flight to United Kingdom from Illinois in the past 72 hours is £280. The best return flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is £816.
The fastest flight from Illinois to United Kingdom takes 7h 45m
Direct flights go from Illinois to United Kingdom every day.
There are 1,285 airports in United Kingdom. From Illinois there are direct flights to London Heathrow (LHR), Edinburgh Turnhouse (EDI).
Search flight deals

Frequently asked questions about flying from Illinois to the United Kingdom

  • 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
Aer LingusPriceFrom £344Free CancellationRating
7.3
1,679 reviews
Search Aer Lingus flights
IcelandairPriceFrom £361Free CancellationRating
7.0
716 reviews
Search Icelandair flights
American AirlinesPriceFrom £388Free CancellationRating
7.1
11,844 reviews
Search American Airlines flights
British AirwaysPriceFrom £416Free CancellationRating
6.7
8,132 reviews
Search British Airways flights
United AirlinesPriceFrom £512Free CancellationRating
7.4
10,037 reviews
Search United Airlines flights
IberiaPriceFrom £523Free CancellationRating
7.0
3,256 reviews
Search Iberia flights
JetBluePriceFrom £791Free CancellationRating
7.1
3,025 reviews
Search JetBlue 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 £32
Flights to Birminghamfrom £31
Flights to Edinburghfrom £29
Flights to Belfastfrom £29
Flights to Glasgowfrom £29
Flights to Bristolfrom £38
Flights to Newcastle upon Tynefrom £35
Flights to Liverpoolfrom £32
Flights to Leedsfrom £41
Flights to Aberdeenfrom £56
Flights to Invernessfrom £41