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Cheap flights from Illinois to the United Kingdom from £236

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 16/8. 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.
Turkish Airlines Logo
20:10 - 16:40
ORD
-
STN
38h 30m
1 stop
Turkish Airlines Logo
17:35 - 09:40
STN
-
ORD
22h 05m
1 stop
£502Turkish Airlines
Tue, 15 Sep - Tue, 22 Sep
Turkish Airlines Logo
20:10 - 13:10
ORD
-
LGW
35h 00m
1 stop
Turkish Airlines Logo
17:35 - 09:40
LGW
-
ORD
22h 05m
1 stop
£505Turkish Airlines
Sun, 20 Sep - Tue, 29 Sep
Multiple Airlines Logo
19:25 - 22:40
ORD
-
STN
21h 15m
2 stops
Multiple Airlines Logo
15:25 - 16:00
STN
-
ORD
30h 35m
2 stops
£505Multiple Airlines
Tue, 28 Apr - Sat, 9 May
Turkish Airlines Logo
20:10 - 16:40
ORD
-
STN
38h 30m
1 stop
Turkish Airlines Logo
17:35 - 09:40
STN
-
ORD
22h 05m
1 stop
£506Turkish Airlines
Tue, 15 Sep - Thu, 15 Oct
Multiple Airlines Logo
22:25 - 23:50
ORD
-
STN
19h 25m
2 stops
Multiple Airlines Logo
22:00 - 19:40
STN
-
ORD
27h 40m
2 stops
£510Multiple Airlines
Sun, 3 May - Tue, 12 May
Icelandair Logo
19:25 - 14:40
ORD
-
LGW
13h 15m
1 stop
Icelandair Logo
15:40 - 21:25
LGW
-
ORD
11h 45m
1 stop
£517Icelandair
Fri, 8 May - Wed, 20 May
Icelandair Logo
19:25 - 11:45
ORD
-
LGW
10h 20m
1 stop
Icelandair Logo
15:40 - 18:15
LGW
-
ORD
32h 35m
1 stop
£519Icelandair
Mon, 27 Apr - Sat, 2 May
Aer Lingus Logo
21:00 - 13:55
ORD
-
LHR
10h 55m
1 stop
Aer Lingus Logo
07:40 - 14:00
LHR
-
ORD
12h 20m
1 stop
£522Aer Lingus
Tue, 9 Jun - Wed, 26 Aug
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
£579Virgin Atlantic
Sun, 23 Aug - Wed, 2 Sep
Virgin Atlantic Logo
16:20 - 09:10
ORD
-
LCY
10h 50m
1 stop
Virgin Atlantic Logo
09:20 - 14:15
LCY
-
ORD
10h 55m
1 stop
£624Virgin Atlantic
Sun, 3 May - Tue, 12 May

United Airlines flights from Illinois to United Kingdom

Our best United Airlines deals on Illinois to United Kingdom flight tickets
United Airlines
28 Apr
STL11:15Lambert-St Louis
18h 40m
1 stop
LHR11:55London Heathrow
6 May
LHR06:50London Heathrow
15h 49m
2 stops
STL16:39Lambert-St Louis
£647
United Airlines
5 May
STL16:06Lambert-St Louis
35h 34m
1 stop
LHR09:40London Heathrow
19 May
LHR17:40London Heathrow
24h 26m
1 stop
STL12:06Lambert-St Louis
£657
United Airlines
12 May
STL13:05Lambert-St Louis
14h 55m
1 stop
LHR10:00London Heathrow
19 May
LHR09:30London Heathrow
16h 55m
1 stop
STL20:25Lambert-St Louis
£662

Scandinavian Airlines flights from Illinois to United Kingdom

Our best Scandinavian Airlines deals on Illinois to United Kingdom flight tickets
Scandinavian Airlines
27 Apr
ORD19:15Chicago O'Hare Intl
14h 45m
1 stop
LHR16:00London Heathrow
1 May
LHR06:40London Heathrow
15h 30m
1 stop
ORD16:10Chicago O'Hare Intl
£549
Scandinavian Airlines
27 Apr
ORD19:15Chicago O'Hare Intl
14h 45m
1 stop
LHR16:00London Heathrow
1 May
LHR06:40London Heathrow
15h 30m
1 stop
ORD16:10Chicago O'Hare Intl
£550
Scandinavian Airlines
27 Apr
ORD19:15Chicago O'Hare Intl
16h 25m
1 stop
LHR17:40London Heathrow
2 May
LHR06:40London Heathrow
15h 30m
1 stop
ORD16:10Chicago O'Hare Intl
£550

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 18 April 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 - STN

ORDSTN

Chicago O'Hare Intl

Tue 15/9

20:10-16:40

1 stop38h 30m

London Stansted

Tue 22/9

17:35-09:40

1 stop22h 05m

£502

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 20/9

20:10-13:10

1 stop35h 00m

London Gatwick

Tue 29/9

17:35-09:40

1 stop22h 05m

£505

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 28/4

19:25-22:40

2 stops21h 15m

London Stansted

Sat 9/5

15:25-16:00

2 stops30h 35m

£505

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 15/9

20:10-16:40

1 stop38h 30m

London Stansted

Thu 15/10

17:35-09:40

1 stop22h 05m

£506

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sun 3/5

22:25-23:50

2 stops19h 25m

London Stansted

Tue 12/5

22:00-19:40

2 stops27h 40m

£510

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 8/5

19:25-14:40

1 stop13h 15m

London Gatwick

Wed 20/5

15:40-21:25

1 stop11h 45m

£517

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 27/4

19:25-11:45

1 stop10h 20m

London Gatwick

Sat 2/5

15:40-18:15

1 stop32h 35m

£519

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 9/6

21:00-13:55

1 stop10h 55m

London Heathrow

Wed 26/8

07:40-14:00

1 stop12h 20m

£522
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

£579

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 3/5

16:20-09:10

1 stop10h 50m

London City

Tue 12/5

09:20-14:15

1 stop10h 55m

£624

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 £475, 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 £487.

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 £510. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to United Kingdom for around £710.

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 £565. Try not to purchase tickets in the afternoon because they tend to be around £653. 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 £587 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 £517 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 33% 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

£358

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 £358. The best return flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is £619.
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

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
IcelandairPriceFrom £336Free CancellationRating
7.0
636 reviews
Search Icelandair flights
Aer LingusPriceFrom £339Free CancellationRating
7.3
1,513 reviews
Search Aer Lingus flights
LufthansaPriceFrom £355Free CancellationRating
6.8
7,930 reviews
Search Lufthansa flights
American AirlinesPriceFrom £383Free CancellationRating
7.1
11,612 reviews
Search American Airlines flights
British AirwaysPriceFrom £420Free CancellationRating
6.7
7,891 reviews
Search British Airways flights
United AirlinesPriceFrom £458Free CancellationRating
7.4
9,605 reviews
Search United Airlines flights
IberiaPriceFrom £515Free CancellationRating
7.0
3,182 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 £30
Flights to Manchesterfrom £29
Flights to Birminghamfrom £38
Flights to Edinburghfrom £29
Flights to Belfastfrom £30
Flights to Glasgowfrom £30
Flights to Bristolfrom £43
Flights to Newcastle upon Tynefrom £35
Flights to Liverpoolfrom £36
Flights to Aberdeenfrom £58
Flights to Leedsfrom £38
Flights to Invernessfrom £47