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Cheap flights from Illinois to the United Kingdom from £139

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 26/1. 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
18:30 - 09:55
ORD
-
GLA
9h 25m1 stop
Icelandair Logo
12:35 - 17:20
GLA
-
ORD
10h 45m1 stop
£352Icelandair
Sun, 18 Jan - Mon, 26 Jan
Icelandair Logo
18:30 - 09:55
ORD
-
GLA
9h 25m1 stop
Icelandair Logo
12:35 - 17:20
GLA
-
ORD
10h 45m1 stop
£364Icelandair
Tue, 13 Jan - Wed, 28 Jan
Multiple Airlines Logo
18:30 - 22:50
ORD
-
EDI
22h 20m2 stops
Multiple Airlines Logo
06:00 - 17:20
EDI
-
ORD
17h 20m2 stops
£364Multiple Airlines
Fri, 23 Jan - Fri, 30 Jan
Icelandair Logo
19:25 - 13:25
ORD
-
GLA
12h 00m1 stop
Icelandair Logo
14:20 - 18:15
GLA
-
ORD
9h 55m1 stop
£367Icelandair
Sun, 5 Apr - Sat, 11 Apr
Multiple Airlines Logo
19:10 - 23:10
ORD
-
GLA
22h 00m2 stops
Multiple Airlines Logo
07:25 - 16:55
GLA
-
ORD
15h 30m2 stops
£375Multiple Airlines
Sun, 25 Jan - Sun, 1 Feb
Scandinavian Airlines Logo
19:10 - 16:25
ORD
-
LHR
15h 15m2 stops
Scandinavian Airlines Logo
06:40 - 16:45
LHR
-
ORD
16h 05m1 stop
£404Scandinavian Airlines
Sun, 18 Jan - Sat, 24 Jan
Scandinavian Airlines Logo
19:20 - 16:00
ORD
-
LHR
14h 40m1 stop
Scandinavian Airlines Logo
06:40 - 16:45
LHR
-
ORD
16h 05m1 stop
£405Scandinavian Airlines
Mon, 12 Jan - Thu, 15 Jan
TAP AIR PORTUGAL Logo
20:15 - 16:15
ORD
-
MAN
14h 00m1 stop
TAP AIR PORTUGAL Logo
17:15 - 15:00
MAN
-
ORD
27h 45m1 stop
£411TAP AIR PORTUGAL
Fri, 9 Jan - Tue, 13 Jan
SWISS Logo
18:50 - 12:55
ORD
-
LCY
12h 05m1 stop
SWISS Logo
09:15 - 16:20
LCY
-
ORD
13h 05m1 stop
£460SWISS
Sun, 11 Jan - Tue, 20 Jan
SWISS Logo
17:10 - 12:55
ORD
-
LCY
14h 45m1 stop
SWISS Logo
09:15 - 15:55
LCY
-
ORD
12h 40m1 stop
£464SWISS
Tue, 17 Mar - Tue, 31 Mar

Austrian Airlines flights from Illinois to United Kingdom

Our best Austrian Airlines deals on Illinois to United Kingdom flight tickets
Austrian Airlines
22 Jan
STL11:22Lambert-St Louis
15h 03m
1 stop
LHR08:25London Heathrow
29 Jan
LHR12:00London Heathrow
17h 59m
1 stop
STL23:59Lambert-St Louis
£492
Find similar
Austrian Airlines
2 Jan
STL06:30Lambert-St Louis
17h 25m
1 stop
LHR05:55London Heathrow
9 Jan
LHR09:10London Heathrow
20h 49m
1 stop
STL23:59Lambert-St Louis
£551
Find similar

Air Canada flights from Illinois to United Kingdom

Our best Air Canada deals on Illinois to United Kingdom flight tickets
Air Canada
11 Jan
ORD07:15Chicago O'Hare Intl
17h 55m
1 stop
LHR07:10London Heathrow
20 Jan
LHR06:50London Heathrow
14h 05m
2 stops
ORD14:55Chicago O'Hare Intl
£447
Find similar
Air Canada
11 Jan
ORD12:50Chicago O'Hare Intl
12h 20m
1 stop
LHR07:10London Heathrow
20 Jan
LHR06:50London Heathrow
14h 05m
2 stops
ORD14:55Chicago O'Hare Intl
£454
Find similar
Air Canada
9 May
STL13:00Lambert-St Louis
26h 00m
2 stops
LHR21:00London Heathrow
20 May
LHR14:05London Heathrow
12h 00m
1 stop
STL20:05Lambert-St Louis
£501
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 28 December 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

Sun 18/1

18:30-09:55

1 stop9h 25m

Glasgow Intl

Mon 26/1

12:35-17:20

1 stop10h 45m

£352

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Tue 13/1

18:30-09:55

1 stop9h 25m

Glasgow Intl

Wed 28/1

12:35-17:20

1 stop10h 45m

£364

ChicagoEdinburgh

ORD - EDI

ORDEDI

Chicago O'Hare Intl

Fri 23/1

18:30-22:50

2 stops22h 20m

Edinburgh Turnhouse

Fri 30/1

06:00-17:20

2 stops17h 20m

£364

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Sun 5/4

19:25-13:25

1 stop12h 00m

Glasgow Intl

Sat 11/4

14:20-18:15

1 stop9h 55m

£367

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Sun 25/1

19:10-23:10

2 stops22h 00m

Glasgow Intl

Sun 1/2

07:25-16:55

2 stops15h 30m

£375

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 18/1

19:10-16:25

2 stops15h 15m

London Heathrow

Sat 24/1

06:40-16:45

1 stop16h 05m

£404

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 12/1

19:20-16:00

1 stop14h 40m

London Heathrow

Thu 15/1

06:40-16:45

1 stop16h 05m

£405

ChicagoManchester

ORD - MAN

ORDMAN

Chicago O'Hare Intl

Fri 9/1

20:15-16:15

1 stop14h 00m

Manchester

Tue 13/1

17:15-15:00

1 stop27h 45m

£411

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 11/1

18:50-12:55

1 stop12h 05m

London City

Tue 20/1

09:15-16:20

1 stop13h 05m

£460

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Tue 17/3

17:10-12:55

1 stop14h 45m

London City

Tue 31/3

09:15-15:55

1 stop12h 40m

£464

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 £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 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 £502. 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 £681.

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 afternoon when flights can be purchased for as low as £558. Try not to purchase tickets at midday because they tend to be around £691. 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 £521 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 48% 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

£295

Fastest flight time

7h 40m

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 £295. The best return flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is £867.
The fastest flight from Illinois to United Kingdom takes 7h 40m
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 £337Free CancellationRating
7.0
592 reviews
Search Icelandair flights
Aer LingusPriceFrom £340Free CancellationRating
7.2
1,413 reviews
Search Aer Lingus flights
LufthansaPriceFrom £356Free CancellationRating
6.8
7,659 reviews
Search Lufthansa flights
British AirwaysPriceFrom £382Free CancellationRating
6.7
7,617 reviews
Search British Airways flights
American AirlinesPriceFrom £383Free CancellationRating
7.2
11,071 reviews
Search American Airlines flights
FinnairPriceFrom £412Free CancellationRating
7.6
1,340 reviews
Search Finnair flights
IberiaPriceFrom £444Free CancellationRating
7.0
3,059 reviews
Search Iberia flights
United AirlinesPriceFrom £459Free CancellationRating
7.4
9,114 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.
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
Flights to Londonfrom £28
Flights to Manchesterfrom £33
Flights to Birminghamfrom £30
Flights to Edinburghfrom £28
Flights to Belfastfrom £28
Flights to Glasgowfrom £30
Flights to Bristolfrom £30
Flights to Newcastle upon Tynefrom £30
Flights to Aberdeenfrom £42
Flights to Liverpoolfrom £38
Flights to Leedsfrom £36
Flights to Invernessfrom £40