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Cheap flights from the United Kingdom to Illinois from $342

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 5/13. 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

Enter your travel dates to find the best prices.
Icelandair Logo
3:40 pm - 9:25 pm
LGW
-
ORD
11h 45m
1 stop
Icelandair Logo
7:25 pm - 2:40 pm
ORD
-
LGW
13h 15m
1 stop
$551Icelandair
Fri, Apr 17 - Fri, Apr 24
Multiple Airlines Logo
7:10 am - 6:15 pm
STN
-
ORD
17h 05m
2 stops
Multiple Airlines Logo
7:25 pm - 12:10 am
ORD
-
STN
22h 45m
2 stops
$551Multiple Airlines
Tue, Apr 14 - Tue, Apr 21
Icelandair Logo
3:40 pm - 6:15 pm
LGW
-
ORD
32h 35m
1 stop
Icelandair Logo
7:25 pm - 2:40 pm
ORD
-
LGW
13h 15m
1 stop
$552Icelandair
Mon, Apr 13 - Mon, Apr 27
TAP AIR PORTUGAL Logo
8:00 am - 4:00 pm
LHR
-
ORD
14h 00m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 6:50 pm
ORD
-
LHR
18h 50m
1 stop
$553TAP AIR PORTUGAL
Fri, Apr 17 - Fri, Apr 24
TAP AIR PORTUGAL Logo
8:00 am - 4:00 pm
LHR
-
ORD
14h 00m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 10:00 pm
ORD
-
LHR
22h 00m
1 stop
$554TAP AIR PORTUGAL
Wed, Apr 15 - Sun, Apr 26
JetBlue Logo
8:05 am - 11:00 pm
LHR
-
ORD
20h 55m
1 stop
JetBlue Logo
12:20 pm - 9:30 am
ORD
-
LHR
16h 10m
1 stop
$560JetBlue
Sat, Mar 7 - Tue, Mar 24
Scandinavian Airlines Logo
6:40 am - 4:10 pm
LHR
-
ORD
15h 30m
2 stops
Scandinavian Airlines Logo
7:15 pm - 4:25 pm
ORD
-
LHR
15h 10m
2 stops
$561Scandinavian Airlines
Mon, Apr 13 - Mon, Apr 27
Scandinavian Airlines Logo
6:40 am - 5:55 pm
LHR
-
ORD
16h 15m
1 stop
Scandinavian Airlines Logo
8:20 pm - 4:25 pm
ORD
-
LHR
15h 05m
2 stops
$563Scandinavian Airlines
Fri, Mar 13 - Mon, Mar 16
British Airways Logo
7:25 pm - 7:33 pm
LHR
-
STL
30h 08m
2 stops
British Airways Logo
8:03 pm - 12:15 pm
STL
-
LHR
10h 12m
1 stop
$727British Airways
Mon, Apr 13 - Mon, Apr 20
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$730British Airways
Tue, Apr 21 - Wed, Apr 29

Icelandair flights from United Kingdom to Illinois

Our best Icelandair deals on United Kingdom to Illinois flight tickets
Icelandair
Apr 17
LGW3:40 pmLondon Gatwick
11h 45m
1 stop
ORD9:25 pmChicago O'Hare Intl
Apr 24
ORD7:25 pmChicago O'Hare Intl
13h 15m
1 stop
LGW2:40 pmLondon Gatwick
$551
Icelandair
Apr 13
LGW3:40 pmLondon Gatwick
32h 35m
1 stop
ORD6:15 pmChicago O'Hare Intl
Apr 27
ORD7:25 pmChicago O'Hare Intl
13h 15m
1 stop
LGW2:40 pmLondon Gatwick
$552
Icelandair
Apr 18
LGW3:40 pmLondon Gatwick
32h 35m
1 stop
ORD6:15 pmChicago O'Hare Intl
Apr 25
ORD7:25 pmChicago O'Hare Intl
13h 15m
1 stop
LGW2:40 pmLondon Gatwick
$553

TAP AIR PORTUGAL flights from United Kingdom to Illinois

Our best TAP AIR PORTUGAL deals on United Kingdom to Illinois flight tickets
TAP AIR PORTUGAL
Apr 17
LHR8:00 amLondon Heathrow
14h 00m
1 stop
ORD4:00 pmChicago O'Hare Intl
Apr 24
ORD6:00 pmChicago O'Hare Intl
18h 50m
1 stop
LHR6:50 pmLondon Heathrow
$553
TAP AIR PORTUGAL
Apr 15
LHR8:00 amLondon Heathrow
14h 00m
1 stop
ORD4:00 pmChicago O'Hare Intl
Apr 26
ORD6:00 pmChicago O'Hare Intl
22h 00m
1 stop
LHR10:00 pmLondon Heathrow
$554
TAP AIR PORTUGAL
Apr 14
LGW4:25 pmLondon Gatwick
29h 35m
1 stop
ORD4:00 pmChicago O'Hare Intl
Apr 25
ORD6:05 pmChicago O'Hare Intl
33h 40m
1 stop
LGW9:45 amLondon Gatwick
$557

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 March 2, 2026.
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

LGW - ORD

LGWORD

London Gatwick

Fri 4/17

3:40 pm-9:25 pm

1 stop11h 45m

Chicago O'Hare Intl

Fri 4/24

7:25 pm-2:40 pm

1 stop13h 15m

$551

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 4/14

7:10 am-6:15 pm

2 stops17h 05m

Chicago O'Hare Intl

Tue 4/21

7:25 pm-12:10 am

2 stops22h 45m

$551

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 4/13

3:40 pm-6:15 pm

1 stop32h 35m

Chicago O'Hare Intl

Mon 4/27

7:25 pm-2:40 pm

1 stop13h 15m

$552

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 4/17

8:00 am-4:00 pm

1 stop14h 00m

Chicago O'Hare Intl

Fri 4/24

6:00 pm-6:50 pm

1 stop18h 50m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/15

8:00 am-4:00 pm

1 stop14h 00m

Chicago O'Hare Intl

Sun 4/26

6:00 pm-10:00 pm

1 stop22h 00m

$554

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 3/7

8:05 am-11:00 pm

1 stop20h 55m

Chicago O'Hare Intl

Tue 3/24

12:20 pm-9:30 am

1 stop16h 10m

$560

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 4/13

6:40 am-4:10 pm

2 stops15h 30m

Chicago O'Hare Intl

Mon 4/27

7:15 pm-4:25 pm

2 stops15h 10m

$561

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 3/13

6:40 am-5:55 pm

1 stop16h 15m

Chicago O'Hare Intl

Mon 3/16

8:20 pm-4:25 pm

2 stops15h 05m

$563

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/13

7:25 pm-7:33 pm

2 stops30h 08m

Lambert-St Louis

Mon 4/20

8:03 pm-12:15 pm

1 stop10h 12m

$727

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/21

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 4/29

9:35 pm-11:35 am

Nonstop8h 00m

$730

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 September. Flight prices, which tend to average around $580, 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 September, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $580.

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 $783. Flights from United Kingdom to Illinois on a Monday will generally be more expensive and average around $891. 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 morning. Flights from United Kingdom to Illinois during this time can be as low as $828. Flights in the afternoon are often more expensive with an average ticket price of $959.

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 $739 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 $690 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 14% 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

$602

Fastest flight time

8h 35m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from United Kingdom in the past 72 hours is $602. The best round-trip flight deal from United Kingdom to Illinois found on momondo in the last 72 hours is $639.
The fastest flight from United Kingdom to Illinois takes 8h 35m
Direct flights go from United Kingdom to Illinois every day.
There are 98 airports in Illinois. From United Kingdom there are direct flights to 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
Aer LingusPriceFrom $446Free CancellationRating
7.2
1,464 reviews
Search Aer Lingus flights
Scandinavian AirlinesPriceFrom $468Free CancellationRating
7.3
1,702 reviews
Search Scandinavian Airlines flights
United AirlinesPriceFrom $485Free CancellationRating
7.4
9,377 reviews
Search United Airlines flights
IcelandairPriceFrom $494Free CancellationRating
7.1
617 reviews
Search Icelandair flights
Austrian AirlinesPriceFrom $530Free CancellationRating
7.6
900 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $531Free CancellationRating
6.7
7,773 reviews
Search British Airways flights
American AirlinesPriceFrom $579Free CancellationRating
7.1
11,375 reviews
Search American Airlines flights
IberiaPriceFrom $599Free CancellationRating
7.0
3,130 reviews
Search Iberia flights
LufthansaPriceFrom $618Free CancellationRating
6.8
7,820 reviews
Search Lufthansa flights
TAP AIR PORTUGALPriceFrom $653Free CancellationRating
7.1
2,155 reviews
Search TAP AIR PORTUGAL 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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