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Cheap flights from London Heathrow Airport to Illinois from £355

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 19/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
10:20 - 16:45LHR-ORD
12h 25m1 stop
Scandinavian Airlines Logo
19:20 - 16:00ORD-LHR
14h 40m1 stop
£396Scandinavian Airlines
Find Deal
Mon, 17 Nov - Mon, 1 Dec
TAP AIR PORTUGAL Logo
16:30 - 15:25LHR-ORD
28h 55m1 stop
TAP AIR PORTUGAL Logo
19:10 - 15:30ORD-LHR
14h 20m1 stop
£396TAP AIR PORTUGAL
Find Deal
Thu, 15 Jan - Wed, 28 Jan
Scandinavian Airlines Logo
10:20 - 16:45LHR-ORD
12h 25m1 stop
Scandinavian Airlines Logo
19:20 - 16:00ORD-LHR
14h 40m1 stop
£397Scandinavian Airlines
Find Deal
Sun, 16 Nov - Sun, 23 Nov
Icelandair Logo
20:35 - 17:20LHR-ORD
26h 45m1 stop
Icelandair Logo
18:30 - 10:50ORD-LHR
10h 20m1 stop
£419Icelandair
Find Deal
Mon, 17 Nov - Tue, 16 Dec
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
Icelandair Logo
18:30 - 19:30ORD-LHR
19h 00m1 stop
£422Icelandair
Find Deal
Tue, 4 Nov - Tue, 11 Nov
British Airways Logo
08:20 - 16:27LHR-STL
14h 07m1 stop
British Airways Logo
16:07 - 08:15STL-LHR
10h 08m1 stop
£542British Airways
Find Deal
Tue, 2 Dec - Tue, 9 Dec
British Airways Logo
11:55 - 22:59LHR-STL
17h 04m1 stop
British Airways Logo
19:58 - 06:55STL-LHR
28h 57m1 stop
£542British Airways
Find Deal
Mon, 24 Nov - Sun, 30 Nov
Finnair Logo
08:20 - 19:30LHR-STL
17h 10m1 stop
Finnair Logo
22:00 - 12:05STL-LHR
8h 05mdirect
£599Finnair
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Mon, 24 Nov - Fri, 1 May
Lufthansa Logo
06:30 - 16:40LHR-PIA
16h 10m2 stops
Lufthansa Logo
17:15 - 11:15PIA-LHR
12h 00m1 stop
£751Lufthansa
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Wed, 3 Dec - Wed, 10 Dec
Lufthansa Logo
10:25 - 21:31LHR-PIA
17h 06m1 stop
Lufthansa Logo
17:15 - 11:15PIA-LHR
12h 00m1 stop
£784Lufthansa
Find Deal
Wed, 3 Dec - Wed, 10 Dec

Scandinavian Airlines flights from London Heathrow Airport to Illinois

Our best Scandinavian Airlines deals on London Heathrow Airport to Illinois flight tickets
Scandinavian Airlines
17 Nov
LHR10:20London Heathrow
12h 25m
1 stop
ORD16:45Chicago O'Hare Intl
1 Dec
ORD19:20Chicago O'Hare Intl
14h 40m
1 stop
LHR16:00London Heathrow
£396
Find similar
Scandinavian Airlines
16 Nov
LHR10:20London Heathrow
12h 25m
1 stop
ORD16:45Chicago O'Hare Intl
23 Nov
ORD19:20Chicago O'Hare Intl
14h 40m
1 stop
LHR16:00London Heathrow
£397
Find similar
Scandinavian Airlines
17 Nov
LHR10:20London Heathrow
12h 25m
1 stop
ORD16:45Chicago O'Hare Intl
1 Dec
ORD19:20Chicago O'Hare Intl
14h 40m
1 stop
LHR16:00London Heathrow
£398
Find similar

Icelandair flights from London Heathrow Airport to Illinois

Our best Icelandair deals on London Heathrow Airport to Illinois flight tickets
Icelandair
17 Nov
LHR20:35London Heathrow
26h 45m
1 stop
ORD17:20Chicago O'Hare Intl
16 Dec
ORD18:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£419
Find similar
Icelandair
4 Nov
LHR12:15London Heathrow
11h 05m
1 stop
ORD17:20Chicago O'Hare Intl
11 Nov
ORD18:30Chicago O'Hare Intl
19h 00m
1 stop
LHR19:30London Heathrow
£422
Find similar
Icelandair
2 Nov
LHR20:35London Heathrow
26h 45m
1 stop
ORD17:20Chicago O'Hare Intl
15 Dec
ORD18:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£425
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 21 October 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 17/11

10:20-16:45

1 stop12h 25m

Chicago O'Hare Intl

Mon 1/12

19:20-16:00

1 stop14h 40m

£396

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 15/1

16:30-15:25

1 stop28h 55m

Chicago O'Hare Intl

Wed 28/1

19:10-15:30

1 stop14h 20m

£396

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 16/11

10:20-16:45

1 stop12h 25m

Chicago O'Hare Intl

Sun 23/11

19:20-16:00

1 stop14h 40m

£397

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 17/11

20:35-17:20

1 stop26h 45m

Chicago O'Hare Intl

Tue 16/12

18:30-10:50

1 stop10h 20m

£419

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 4/11

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Tue 11/11

18:30-19:30

1 stop19h 00m

£422

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 2/12

08:20-16:27

1 stop14h 07m

Lambert-St Louis

Tue 9/12

16:07-08:15

1 stop10h 08m

£542

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 24/11

11:55-22:59

1 stop17h 04m

Lambert-St Louis

Sun 30/11

19:58-06:55

1 stop28h 57m

£542

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 24/11

08:20-19:30

1 stop17h 10m

Lambert-St Louis

Fri 1/5

22:00-12:05

Nonstop8h 05m

£599

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Wed 3/12

06:30-16:40

2 stops16h 10m

Greater Peoria

Wed 10/12

17:15-11:15

1 stop12h 00m

£751

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Wed 3/12

10:25-21:31

1 stop17h 06m

Greater Peoria

Wed 10/12

17:15-11:15

1 stop12h 00m

£784

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 £441. 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 £447.

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 £612. 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 £673. 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 £556. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £672 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 £545 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 £516 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 17% 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

£453

Fastest flight time

8h 35m

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 £453. The best return flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is £525.
The fastest flight from London Heathrow Airport to Illinois takes 8h 35m
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 £340Free CancellationRating
7.0
560 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £345Free CancellationRating
7.5
670 reviews
Search Virgin Atlantic flights
Scandinavian AirlinesPriceFrom £356Free CancellationRating
7.4
1,535 reviews
Search Scandinavian Airlines flights
TAP AIR PORTUGALPriceFrom £369Free CancellationRating
7.1
2,022 reviews
Search TAP AIR PORTUGAL flights
Aer LingusPriceFrom £371Free CancellationRating
7.2
1,348 reviews
Search Aer Lingus flights
Brussels AirlinesPriceFrom £386Free CancellationRating
7.2
366 reviews
Search Brussels Airlines flights
LufthansaPriceFrom £396Free CancellationRating
6.8
7,508 reviews
Search Lufthansa flights
Austrian AirlinesPriceFrom £404Free CancellationRating
7.6
860 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom £404Free CancellationRating
6.7
7,462 reviews
Search British Airways flights
United AirlinesPriceFrom £409Free CancellationRating
7.4
8,988 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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