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Cheap flights from London Heathrow Airport to Illinois from £331

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Illinois departing on 3/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from London Heathrow Airport to Illinois

Cheap return flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m1 stop
Scandinavian Airlines Logo
19:20 - 18:30ORD-LHR
17h 10m1 stop
£409Scandinavian Airlines
Find Deal
Mon, 24 Nov - Mon, 8 Dec
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m2 stops
Scandinavian Airlines Logo
19:20 - 18:50ORD-LHR
17h 30m2 stops
£410Scandinavian Airlines
Find Deal
Thu, 4 Dec - Wed, 14 Jan
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m1 stop
Scandinavian Airlines Logo
19:20 - 16:25ORD-LHR
15h 05m2 stops
£411Scandinavian Airlines
Find Deal
Mon, 24 Nov - Mon, 8 Dec
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
Icelandair Logo
18:30 - 10:50ORD-LHR
10h 20m1 stop
£422Icelandair
Find Deal
Tue, 25 Nov - Tue, 2 Dec
Icelandair Logo
20:35 - 17:20LHR-ORD
26h 45m1 stop
Icelandair Logo
18:30 - 10:50ORD-LHR
10h 20m1 stop
£424Icelandair
Find Deal
Sun, 23 Nov - Thu, 27 Nov
British Airways Logo
08:05 - 22:44LHR-STL
20h 39m2 stops
British Airways Logo
17:04 - 11:40STL-LHR
12h 36m1 stop
£538British Airways
Find Deal
Thu, 29 Jan - Thu, 5 Feb
British Airways Logo
09:15 - 16:13LHR-STL
12h 58m1 stop
British Airways Logo
14:19 - 07:05STL-LHR
10h 46m1 stop
£539British Airways
Find Deal
Wed, 22 Apr - Tue, 28 Apr
Finnair Logo
10:20 - 21:48LHR-STL
17h 28m2 stops
Finnair Logo
12:06 - 08:05STL-LHR
13h 59m1 stop
£543Finnair
Find Deal
Wed, 22 Apr - Tue, 28 Apr
Finnair Logo
14:30 - 23:24LHR-STL
14h 54m2 stops
Finnair Logo
09:15 - 06:20STL-LHR
15h 05m2 stops
£550Finnair
Find Deal
Wed, 22 Apr - Tue, 28 Apr
Lufthansa Logo
07:40 - 21:39LHR-PIA
19h 59m1 stop
Lufthansa Logo
17:19 - 05:55PIA-LHR
30h 36m1 stop
£1,228Lufthansa
Find Deal
Sun, 21 Dec - Sun, 28 Dec

Icelandair flights from London Heathrow Airport to Illinois

Our best Icelandair deals on London Heathrow Airport to Illinois flight tickets
Icelandair
25 Nov
LHR12:15London Heathrow
11h 05m
1 stop
ORD17:20Chicago O'Hare Intl
2 Dec
ORD18:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£422
Find similar
Icelandair
23 Nov
LHR20:35London Heathrow
26h 45m
1 stop
ORD17:20Chicago O'Hare Intl
27 Nov
ORD18:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£424
Find similar
Icelandair
25 Nov
LHR12:15London Heathrow
11h 05m
1 stop
ORD17:20Chicago O'Hare Intl
2 Dec
ORD18:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£428
Find similar

Scandinavian Airlines flights from London Heathrow Airport to Illinois

Our best Scandinavian Airlines deals on London Heathrow Airport to Illinois flight tickets
Scandinavian Airlines
24 Nov
LHR06:40London Heathrow
16h 05m
1 stop
ORD16:45Chicago O'Hare Intl
8 Dec
ORD19:20Chicago O'Hare Intl
17h 10m
1 stop
LHR18:30London Heathrow
£409
Find similar
Scandinavian Airlines
4 Dec
LHR06:40London Heathrow
16h 05m
2 stops
ORD16:45Chicago O'Hare Intl
14 Jan
ORD19:20Chicago O'Hare Intl
17h 30m
2 stops
LHR18:50London Heathrow
£410
Find similar
Scandinavian Airlines
24 Nov
LHR06:40London Heathrow
16h 05m
1 stop
ORD16:45Chicago O'Hare Intl
8 Dec
ORD19:20Chicago O'Hare Intl
15h 05m
2 stops
LHR16:25London Heathrow
£411
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport 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 7 November 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 24/11

06:40-16:45

1 stop16h 05m

Chicago O'Hare Intl

Mon 8/12

19:20-18:30

1 stop17h 10m

£409

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 4/12

06:40-16:45

2 stops16h 05m

Chicago O'Hare Intl

Wed 14/1

19:20-18:50

2 stops17h 30m

£410

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 24/11

06:40-16:45

1 stop16h 05m

Chicago O'Hare Intl

Mon 8/12

19:20-16:25

2 stops15h 05m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 25/11

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Tue 2/12

18:30-10:50

1 stop10h 20m

£422

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 23/11

20:35-17:20

1 stop26h 45m

Chicago O'Hare Intl

Thu 27/11

18:30-10:50

1 stop10h 20m

£424

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 29/1

08:05-22:44

2 stops20h 39m

Lambert-St Louis

Thu 5/2

17:04-11:40

1 stop12h 36m

£538

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 22/4

09:15-16:13

1 stop12h 58m

Lambert-St Louis

Tue 28/4

14:19-07:05

1 stop10h 46m

£539

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 22/4

10:20-21:48

2 stops17h 28m

Lambert-St Louis

Tue 28/4

12:06-08:05

1 stop13h 59m

£543

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 22/4

14:30-23:24

2 stops14h 54m

Lambert-St Louis

Tue 28/4

09:15-06:20

2 stops15h 05m

£550

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Sun 21/12

07:40-21:39

1 stop19h 59m

Greater Peoria

Sun 28/12

17:19-05:55

1 stop30h 36m

£1,228

Flights are sorted by cheapest return flights first.

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

How to get the cheapest flight ticket from London Heathrow Airport 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 February is, on average, the cheapest month to fly to Illinois from London Heathrow Airport, with most prices found around £456. 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 £458.

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 £628. This is often the case because there is less demand to fly during this day of the week. Flights from London Heathrow Airport to Illinois on a Saturday will generally be more expensive and average around £687. 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 London Heathrow Airport to Illinois flights are usually those with departure times in the evening. Our users have found flights to Illinois in the evening for as low as £570. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £689 per ticket.

What is the cheapest London Heathrow to Illinois flight route?

Fly from London Heathrow to Chicago O'Hare Intl for the best London Heathrow - 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 London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around £560 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 London Heathrow Airport for as low as £529 on momondo.

What cabin class options are available on London Heathrow to Illinois flights?

There are 4 cabin classes available to choose from on London Heathrow 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 London Heathrow Airport to Illinois flights?

You could potentially save up to 11% on your flight if you consider stops on a London Heathrow Airport to Illinois flight.

Cheap London Heathrow Airport to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Illinois

Best price found

£460

Fastest flight time

8h 25m

Direct flights

Every day

Airports in Illinois

1 airport
The best one-way flight to Illinois from London Heathrow Airport in the past 72 hours is £460. The best return flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is £582.
The fastest flight from London Heathrow Airport to Illinois takes 8h 25m
Direct flights go from London Heathrow Airport 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 London Heathrow Airport to Illinois?

    Prices for flights from London Heathrow Airport to Illinois refresh daily.

  • How many operators does momondo search for flights from London Heathrow Airport to Illinois?

  • How old do you have to be to fly from London Heathrow Airport 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 London Heathrow Airport to Illinois.

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

    The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London Heathrow Airport to Illinois?

Best airlines flying from London Heathrow Airport to Illinois

Compare and see reviews for airlines that fly from London Heathrow Airport to Illinois with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom £349Free CancellationRating
7.1
572 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £354Free CancellationRating
7.5
672 reviews
Search Virgin Atlantic flights
Scandinavian AirlinesPriceFrom £369Free CancellationRating
7.4
1,566 reviews
Search Scandinavian Airlines flights
TAP AIR PORTUGALPriceFrom £378Free CancellationRating
7.1
2,049 reviews
Search TAP AIR PORTUGAL flights
Aer LingusPriceFrom £379Free CancellationRating
7.2
1,365 reviews
Search Aer Lingus flights
Brussels AirlinesPriceFrom £396Free CancellationRating
7.2
369 reviews
Search Brussels Airlines flights
LufthansaPriceFrom £406Free CancellationRating
6.8
7,558 reviews
Search Lufthansa flights
British AirwaysPriceFrom £414Free CancellationRating
6.7
7,500 reviews
Search British Airways flights
Austrian AirlinesPriceFrom £414Free CancellationRating
7.6
865 reviews
Search Austrian Airlines flights
United AirlinesPriceFrom £418Free CancellationRating
7.4
9,009 reviews
Search United Airlines flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Illinois from London.

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

Yes. momondo allows you to filter the results for London to Illinois flights to just show those with flexible booking policies.

How can momondo help me find flights from London to Illinois?

Once all potential London to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to Illinois, momondo offers a useful price alert feature which will track prices for flights to Illinois from London and alert you when they change.

An easier way to manage your Illinois trip

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