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Cheap flights from the United Kingdom to Illinois from £257

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 9/4. 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 return flight deals from the United Kingdom to Illinois

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
16:30 - 16:25
LHR
-
ORD
28h 55m
1 stop
TAP AIR PORTUGAL Logo
21:25 - 17:30
ORD
-
LHR
15h 05m
1 stop
£403TAP AIR PORTUGAL
Thu, 12 Mar - Sun, 22 Mar
Icelandair Logo
15:40 - 18:15
LGW
-
ORD
32h 35m
1 stop
Icelandair Logo
19:25 - 11:45
ORD
-
LGW
10h 20m
1 stop
£405Icelandair
Mon, 13 Apr - Mon, 27 Apr
Scandinavian Airlines Logo
10:20 - 17:45
LHR
-
ORD
12h 25m
1 stop
Scandinavian Airlines Logo
20:20 - 16:00
ORD
-
LHR
14h 40m
1 stop
£407Scandinavian Airlines
Thu, 12 Mar - Mon, 16 Mar
Scandinavian Airlines Logo
06:40 - 16:10
LHR
-
ORD
15h 30m
1 stop
Scandinavian Airlines Logo
19:15 - 21:40
ORD
-
LHR
20h 25m
1 stop
£410Scandinavian Airlines
Fri, 17 Apr - Mon, 20 Apr
Virgin Atlantic Logo
10:45 - 16:42
LHR
-
STL
11h 57m
1 stop
Virgin Atlantic Logo
13:02 - 07:15
STL
-
LHR
12h 13m
1 stop
£522Virgin Atlantic
Mon, 13 Apr - Mon, 20 Apr
Virgin Atlantic Logo
10:45 - 16:42
LHR
-
STL
11h 57m
1 stop
Virgin Atlantic Logo
13:46 - 07:10
STL
-
LHR
11h 24m
1 stop
£527Virgin Atlantic
Mon, 13 Apr - Mon, 20 Apr
Finnair Logo
12:15 - 22:24
LHR
-
STL
16h 09m
1 stop
Finnair Logo
08:54 - 06:25
STL
-
LHR
15h 31m
2 stops
£529Finnair
Mon, 20 Apr - Thu, 30 Apr
Finnair Logo
09:45 - 16:41
LHR
-
STL
12h 56m
1 stop
Finnair Logo
09:10 - 06:55
STL
-
LHR
15h 45m
1 stop
£530Finnair
Mon, 20 Apr - Thu, 30 Apr
British Airways Logo
20:50 - 19:29
LHR
-
STL
28h 39m
2 stops
British Airways Logo
11:45 - 08:00
STL
-
LHR
14h 15m
1 stop
£550British Airways
Sun, 12 Apr - Mon, 11 May
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£556British Airways
Tue, 21 Apr - Tue, 28 Apr

Icelandair flights from United Kingdom to Illinois

Our best Icelandair deals on United Kingdom to Illinois flight tickets
Icelandair
13 Apr
LGW15:40London Gatwick
32h 35m
1 stop
ORD18:15Chicago O'Hare Intl
27 Apr
ORD19:25Chicago O'Hare Intl
10h 20m
1 stop
LGW11:45London Gatwick
£401
Icelandair
14 Apr
LGW15:40London Gatwick
32h 35m
1 stop
ORD18:15Chicago O'Hare Intl
20 Apr
ORD19:25Chicago O'Hare Intl
13h 15m
1 stop
LGW14:40London Gatwick
£404
Icelandair
13 Apr
LGW15:40London Gatwick
32h 35m
1 stop
ORD18:15Chicago O'Hare Intl
27 Apr
ORD19:25Chicago O'Hare Intl
10h 20m
1 stop
LGW11:45London Gatwick
£405

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
12 Mar
LHR16:30London Heathrow
28h 55m
1 stop
ORD16:25Chicago O'Hare Intl
22 Mar
ORD21:25Chicago O'Hare Intl
15h 05m
1 stop
LHR17:30London Heathrow
£403
TAP AIR PORTUGAL
17 Apr
LHR19:50London Heathrow
26h 15m
1 stop
ORD16:05Chicago O'Hare Intl
25 Apr
ORD18:05Chicago O'Hare Intl
34h 15m
1 stop
LHR10:20London Heathrow
£407
TAP AIR PORTUGAL
18 Apr
LGW16:30London Gatwick
29h 30m
1 stop
ORD16:00Chicago O'Hare Intl
25 Apr
ORD18:05Chicago O'Hare Intl
33h 40m
1 stop
LGW09:45London Gatwick
£408

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 28 February 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

LHR - ORD

LHRORD

London Heathrow

Thu 12/3

16:30-16:25

1 stop28h 55m

Chicago O'Hare Intl

Sun 22/3

21:25-17:30

1 stop15h 05m

£403

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 13/4

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Mon 27/4

19:25-11:45

1 stop10h 20m

£405

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 12/3

10:20-17:45

1 stop12h 25m

Chicago O'Hare Intl

Mon 16/3

20:20-16:00

1 stop14h 40m

£407

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 17/4

06:40-16:10

1 stop15h 30m

Chicago O'Hare Intl

Mon 20/4

19:15-21:40

1 stop20h 25m

£410

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 13/4

10:45-16:42

1 stop11h 57m

Lambert-St Louis

Mon 20/4

13:02-07:15

1 stop12h 13m

£522

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 13/4

10:45-16:42

1 stop11h 57m

Lambert-St Louis

Mon 20/4

13:46-07:10

1 stop11h 24m

£527

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

12:15-22:24

1 stop16h 09m

Lambert-St Louis

Thu 30/4

08:54-06:25

2 stops15h 31m

£529

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

09:45-16:41

1 stop12h 56m

Lambert-St Louis

Thu 30/4

09:10-06:55

1 stop15h 45m

£530

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 12/4

20:50-19:29

2 stops28h 39m

Lambert-St Louis

Mon 11/5

11:45-08:00

1 stop14h 15m

£550

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 21/4

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Tue 28/4

21:35-11:35

Nonstop8h 00m

£556

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 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 month of September is, on average, the cheapest month to fly to Illinois from United Kingdom, with most prices found around £430. 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 £430.

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

The cheapest day to depart on your flight to Illinois is on a Wednesday when prices can be found for as low as £620. This is often the case because there is less demand to fly during this day of the week. Flights from United Kingdom to Illinois on a Sunday will generally be more expensive and average around £660. 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 data shows that the cheapest United Kingdom to Illinois flights are usually those with departure times at midday. Our users have found flights to Illinois at midday for as low as £631. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £666 per ticket.

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 £546 when searching weeks before you fly. 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 £512 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 6% 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

£422

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 £422. The best return flight deal from United Kingdom to Illinois found on momondo in the last 72 hours is £536.
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 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 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 £285Free CancellationRating
7.1
617 reviews
Search Icelandair flights
LufthansaPriceFrom £286Free CancellationRating
6.8
7,818 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom £343Free CancellationRating
7.5
680 reviews
Search Virgin Atlantic flights
Aer LingusPriceFrom £363Free CancellationRating
7.2
1,464 reviews
Search Aer Lingus flights
Scandinavian AirlinesPriceFrom £368Free CancellationRating
7.3
1,700 reviews
Search Scandinavian Airlines flights
TAP AIR PORTUGALPriceFrom £384Free CancellationRating
7.1
2,153 reviews
Search TAP AIR PORTUGAL flights
Brussels AirlinesPriceFrom £384Free CancellationRating
7.2
387 reviews
Search Brussels Airlines flights
British AirwaysPriceFrom £391Free CancellationRating
6.7
7,772 reviews
Search British Airways flights
Austrian AirlinesPriceFrom £400Free CancellationRating
7.6
901 reviews
Search Austrian Airlines flights
United AirlinesPriceFrom £409Free CancellationRating
7.4
9,365 reviews
Search United Airlines 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?

Once you have performed a search for United Kingdom to Illinois flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from United Kingdom to Illinois right now. Can momondo alert me if prices change?

If you are not ready to book a flight from United Kingdom to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.

An easier way to manage your Illinois trip

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