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Cheap flights from the United Kingdom to Illinois from $351

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United Kingdom to Illinois departing on 10/22. 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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Find the cheapest flights from the United Kingdom to Illinois

Recent round-trip flight deals from the United Kingdom to Illinois

Multiple Airlines Logo
9:00 am - 6:45 pmLHR-ORD
15h 45m2 stops
Multiple Airlines Logo
10:00 am - 7:10 amORD-LHR
15h 10m2 stops
$531Multiple Airlines
Find Deal
Thu, Nov 6 - Sun, Nov 9
Multiple Airlines Logo
9:50 am - 7:13 amLGW-ORD
27h 23m2 stops
Multiple Airlines Logo
10:15 am - 6:00 amORD-LGW
13h 45m1 stop
$532Multiple Airlines
Find Deal
Tue, Jan 27 - Mon, Feb 2
American Airlines Logo
11:20 am - 9:05 amLGW-ORD
27h 45m2 stops
American Airlines Logo
8:20 am - 7:30 amORD-LGW
17h 10m2 stops
$536American Airlines
Find Deal
Thu, Nov 27 - Sun, Nov 30
British Airways Logo
3:45 pm - 6:45 pmLHR-ORD
9h 00mnonstop
British Airways Logo
8:40 pm - 10:25 amORD-LHR
7h 45mnonstop
$539British Airways
Find Deal
Thu, Nov 27 - Sun, Nov 30
British Airways Logo
9:15 am - 5:36 pmLHR-ORD
14h 21m1 stop
British Airways Logo
10:35 pm - 12:15 pmORD-LHR
7h 40mnonstop
$543British Airways
Find Deal
Thu, Oct 9 - Sun, Oct 12
Icelandair Logo
3:40 pm - 9:15 pmLGW-ORD
11h 35m1 stop
Icelandair Logo
7:25 pm - 2:40 pmORD-LGW
13h 15m1 stop
$547Icelandair
Find Deal
Wed, Oct 15 - Tue, Oct 21
Icelandair Logo
11:55 am - 6:20 pmLGW-ORD
11h 25m1 stop
Icelandair Logo
6:30 pm - 10:55 amORD-LGW
10h 25m1 stop
$548Icelandair
Find Deal
Sat, Nov 1 - Sat, Nov 8
American Airlines Logo
3:00 pm - 9:24 pmLHR-ORD
12h 24m1 stop
American Airlines Logo
5:11 pm - 10:05 amORD-LHR
10h 54m1 stop
$576American Airlines
Find Deal
Thu, Oct 9 - Mon, Oct 13
Aer Lingus Logo
8:10 am - 2:00 pmMAN-ORD
11h 50m1 stop
Aer Lingus Logo
3:45 pm - 7:35 amORD-MAN
9h 50m1 stop
$652Aer Lingus
Find Deal
Tue, Oct 14 - Tue, Oct 21
Aer Lingus Logo
8:20 am - 2:00 pmEDI-ORD
11h 40m1 stop
Aer Lingus Logo
3:50 pm - 8:30 amORD-EDI
10h 40m1 stop
$717Aer Lingus
Find Deal
Tue, Dec 9 - Thu, Dec 11

United Airlines flights from United Kingdom to Illinois

Our best United Airlines deals on United Kingdom to Illinois flight tickets
United Airlines
Nov 1
LHR6:50 amLondon Heathrow
11h 20m
1 stop
ORD1:10 pmChicago O'Hare Intl
Nov 14
ORD3:45 pmChicago O'Hare Intl
8h 10m
LHR5:55 amLondon Heathrow
$532
Find similar
United Airlines
Oct 4
LHR10:30 amLondon Heathrow
18h 45m
2 stops
ORD11:15 pmChicago O'Hare Intl
Oct 11
ORD5:05 pmChicago O'Hare Intl
11h 05m
1 stop
LHR10:10 amLondon Heathrow
$534
Find similar
United Airlines
Sep 30
LHR7:45 amLondon Heathrow
14h 50m
2 stops
ORD4:35 pmChicago O'Hare Intl
Oct 7
ORD6:00 pmChicago O'Hare Intl
8h 20m
LHR8:20 amLondon Heathrow
$536
Find similar

Virgin Atlantic flights from United Kingdom to Illinois

Our best Virgin Atlantic deals on United Kingdom to Illinois flight tickets
Virgin Atlantic
Oct 1
LHR12:45 pmLondon Heathrow
14h 36m
1 stop
ORD9:21 pmChicago O'Hare Intl
Oct 8
ORD1:08 pmChicago O'Hare Intl
12h 07m
1 stop
LHR7:15 amLondon Heathrow
$539
Find similar
Virgin Atlantic
Nov 1
LHR6:30 amLondon Heathrow
13h 50m
1 stop
ORD3:20 pmChicago O'Hare Intl
Nov 22
ORD8:50 amChicago O'Hare Intl
16h 15m
1 stop
LHR7:05 amLondon Heathrow
$540
Find similar
Virgin Atlantic
Nov 21
LHR11:05 amLondon Heathrow
13h 13m
1 stop
MDW6:18 pmChicago Midway
Nov 25
MDW1:47 pmChicago Midway
11h 18m
1 stop
LHR7:05 amLondon Heathrow
$541
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from United Kingdom to Illinois 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 832,500 searches. Data last updated September 23, 2025.
Use the filters below to find and compare flights from the United Kingdom to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/6

9:00 am-6:45 pm

2 stops15h 45m

Chicago O'Hare Intl

Sun 11/9

10:00 am-7:10 am

2 stops15h 10m

$531

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 1/27

9:50 am-7:13 am

2 stops27h 23m

Chicago O'Hare Intl

Mon 2/2

10:15 am-6:00 am

1 stop13h 45m

$532

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 11/27

11:20 am-9:05 am

2 stops27h 45m

Chicago O'Hare Intl

Sun 11/30

8:20 am-7:30 am

2 stops17h 10m

$536

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/27

3:45 pm-6:45 pm

Nonstop9h 00m

Chicago O'Hare Intl

Sun 11/30

8:40 pm-10:25 am

Nonstop7h 45m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/9

9:15 am-5:36 pm

1 stop14h 21m

Chicago O'Hare Intl

Sun 10/12

10:35 pm-12:15 pm

Nonstop7h 40m

$543

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 10/15

3:40 pm-9:15 pm

1 stop11h 35m

Chicago O'Hare Intl

Tue 10/21

7:25 pm-2:40 pm

1 stop13h 15m

$547

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 11/1

11:55 am-6:20 pm

1 stop11h 25m

Chicago O'Hare Intl

Sat 11/8

6:30 pm-10:55 am

1 stop10h 25m

$548

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/9

3:00 pm-9:24 pm

1 stop12h 24m

Chicago O'Hare Intl

Mon 10/13

5:11 pm-10:05 am

1 stop10h 54m

$576

ManchesterChicago

MAN - ORD

MANORD

Manchester

Tue 10/14

8:10 am-2:00 pm

1 stop11h 50m

Chicago O'Hare Intl

Tue 10/21

3:45 pm-7:35 am

1 stop9h 50m

$652

EdinburghChicago

EDI - ORD

EDIORD

Edinburgh Turnhouse

Tue 12/9

8:20 am-2:00 pm

1 stop11h 40m

Chicago O'Hare Intl

Thu 12/11

3:50 pm-8:30 am

1 stop10h 40m

$717

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from United Kingdom to Illinois

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 Illinois?

The cheapest month to fly to Illinois from United Kingdom is in February. Flight prices, which tend to average around $579, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $593.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from United Kingdom to Illinois is on a Wednesday when prices can be found for as low as $772. Flights from United Kingdom to Illinois on a Sunday will generally be more expensive and average around $918. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from United Kingdom to Illinois during this time can be as low as $620. Flights in the afternoon are often more expensive with an average ticket price of $938.

What is the cheapest United Kingdom to Illinois flight route?

Fly from London Heathrow to Chicago O'Hare Intl for the best United Kingdom - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $723 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from United Kingdom for as low as $692 on momondo.

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

There are 4 cabin classes available to choose from on United Kingdom to Illinois 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 United Kingdom to Illinois flights?

You could potentially save up to 10% on your flight if you consider stops on a United Kingdom to Illinois flight.

Cheap United Kingdom to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United Kingdom to Illinois

Best Price Found

$632

Fastest flight time

8h 25m

Direct flights

Every day

Airports in Illinois

1 airport
The best one-way flight to Illinois from United Kingdom in the past 72 hours is $632. The best round-trip flight deal from United Kingdom to Illinois found on momondo in the last 72 hours is $753.
The fastest flight from United Kingdom to Illinois takes 8h 25m
Direct flights go from United Kingdom to Illinois every day.
There is 1 airport near Illinois: Chicago O'Hare Intl (ORD)
Search flight deals

  • When did momondo last update prices for flights from United Kingdom to Illinois?

    Prices for flights from United Kingdom to Illinois are updated daily.

  • How many operators does momondo search for flights from United Kingdom to Illinois?

  • How old do you have to be to fly from United Kingdom to Illinois?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from United Kingdom to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from United Kingdom to Illinois?

Best airlines flying from United Kingdom to Illinois

Compare and see reviews for airlines that fly from United Kingdom to Illinois with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $390Free CancellationRating
7.0
545 reviews
Search Icelandair flights
Aer LingusPriceFrom $453Free CancellationRating
7.2
1,296 reviews
Search Aer Lingus flights
Scandinavian AirlinesPriceFrom $462Free CancellationRating
7.4
1,492 reviews
Search Scandinavian Airlines flights
United AirlinesPriceFrom $485Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
British AirwaysPriceFrom $531Free CancellationRating
6.7
7,391 reviews
Search British Airways flights
TAP AIR PORTUGALPriceFrom $558Free CancellationRating
7.1
1,988 reviews
Search TAP AIR PORTUGAL flights
American AirlinesPriceFrom $572Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Austrian AirlinesPriceFrom $584Free CancellationRating
7.6
853 reviews
Search Austrian Airlines flights
IberiaPriceFrom $599Free CancellationRating
7.0
2,943 reviews
Search Iberia flights
FinnairPriceFrom $626Free CancellationRating
7.6
1,326 reviews
Search Finnair flights

Why use momondo?

Why should I use momondo to find a flight deal from United Kingdom to Illinois?

Finding the right flight to Illinois from United Kingdom 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 Illinois quick and easy, saving you time and money.

Can I find flights from United Kingdom to Illinois with flexible booking policies on momondo?

Flights from United Kingdom to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from United Kingdom to Illinois?

momondo helps you find the best flight between United Kingdom and Illinois 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 United Kingdom to Illinois right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of United Kingdom to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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