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Cheap flights from London Heathrow Airport to Illinois from £359

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 19/2. 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 London Heathrow Airport to Illinois

Cheap return flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
07:05 - 16:45
LHR
-
ORD
15h 40m2 stops
Scandinavian Airlines Logo
10:40 - 09:20
ORD
-
LHR
17h 40m2 stops
£469Scandinavian Airlines
Wed, 4 Mar - Tue, 10 Mar
TAP AIR PORTUGAL Logo
06:00 - 16:00
LHR
-
ORD
16h 00m1 stop
TAP AIR PORTUGAL Logo
18:00 - 18:50
ORD
-
LHR
18h 50m1 stop
£470TAP AIR PORTUGAL
Wed, 8 Apr - Sun, 12 Apr
Multiple Airlines Logo
07:50 - 17:20
LHR
-
ORD
15h 30m2 stops
Multiple Airlines Logo
18:30 - 19:50
ORD
-
LHR
19h 20m2 stops
£471Multiple Airlines
Tue, 20 Jan - Tue, 27 Jan
Icelandair Logo
20:35 - 17:20
LHR
-
ORD
26h 45m1 stop
Icelandair Logo
18:30 - 10:50
ORD
-
LHR
10h 20m1 stop
£472Icelandair
Tue, 23 Dec - Thu, 15 Jan
Icelandair Logo
12:15 - 17:20
LHR
-
ORD
11h 05m1 stop
Icelandair Logo
22:40 - 20:20
ORD
-
LHR
15h 40m1 stop
£472Icelandair
Fri, 27 Feb - Tue, 30 Jun
British Airways Logo
08:20 - 16:14
LHR
-
STL
13h 54m1 stop
British Airways Logo
12:11 - 06:30
STL
-
LHR
12h 19m1 stop
£528British Airways
Tue, 20 Jan - Tue, 27 Jan
Finnair Logo
17:00 - 09:03
LHR
-
STL
22h 03m2 stops
Finnair Logo
14:54 - 09:40
STL
-
LHR
12h 46m2 stops
£537Finnair
Tue, 20 Jan - Tue, 27 Jan
British Airways Logo
07:30 - 21:15
LHR
-
STL
19h 45m2 stops
British Airways Logo
17:04 - 12:15
STL
-
LHR
13h 11m1 stop
£557British Airways
Thu, 22 Jan - Mon, 26 Jan
Lufthansa Logo
07:30 - 21:36
LHR
-
MLI
20h 06m2 stops
Lufthansa Logo
17:29 - 11:15
MLI
-
LHR
11h 46m1 stop
£834Lufthansa
Thu, 22 Jan - Fri, 30 Jan
Lufthansa Logo
13:35 - 21:36
LHR
-
MLI
14h 01m1 stop
Lufthansa Logo
17:29 - 11:15
MLI
-
LHR
11h 46m1 stop
£868Lufthansa
Thu, 22 Jan - Fri, 30 Jan

Icelandair flights from London Heathrow Airport to Illinois

Our best Icelandair deals on London Heathrow Airport to Illinois flight tickets
Icelandair
23 Dec
LHR20:35London Heathrow
26h 45m
1 stop
ORD17:20Chicago O'Hare Intl
15 Jan
ORD18:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£472
Find similar
Icelandair
27 Feb
LHR12:15London Heathrow
11h 05m
1 stop
ORD17:20Chicago O'Hare Intl
30 Jun
ORD22:40Chicago O'Hare Intl
15h 40m
1 stop
LHR20:20London Heathrow
£472
Find similar
Icelandair
27 Apr
LHR21:25London Heathrow
26h 50m
1 stop
ORD18:15Chicago O'Hare Intl
25 May
ORD19:25Chicago O'Hare Intl
10h 30m
1 stop
LHR11:55London Heathrow
£475
Find similar

Lufthansa flights from London Heathrow Airport to Illinois

Our best Lufthansa deals on London Heathrow Airport to Illinois flight tickets
Lufthansa
20 Jan
LHR11:10London Heathrow
13h 15m
1 stop
ORD18:25Chicago O'Hare Intl
27 Jan
ORD15:45Chicago O'Hare Intl
8h 10m
LHR05:55London Heathrow
£482
Find similar
Lufthansa
16 Feb
LHR08:30London Heathrow
12h 50m
1 stop
ORD15:20Chicago O'Hare Intl
23 Feb
ORD17:50Chicago O'Hare Intl
8h 05m
LHR07:55London Heathrow
£486
Find similar
Lufthansa
4 Mar
LHR06:50London Heathrow
11h 20m
1 stop
ORD12:10Chicago O'Hare Intl
31 Mar
ORD16:25Chicago O'Hare Intl
8h 20m
LHR06:45London Heathrow
£487
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 8 December 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

Wed 4/3

07:05-16:45

2 stops15h 40m

Chicago O'Hare Intl

Tue 10/3

10:40-09:20

2 stops17h 40m

£469

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 8/4

06:00-16:00

1 stop16h 00m

Chicago O'Hare Intl

Sun 12/4

18:00-18:50

1 stop18h 50m

£470

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 20/1

07:50-17:20

2 stops15h 30m

Chicago O'Hare Intl

Tue 27/1

18:30-19:50

2 stops19h 20m

£471

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 23/12

20:35-17:20

1 stop26h 45m

Chicago O'Hare Intl

Thu 15/1

18:30-10:50

1 stop10h 20m

£472

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 27/2

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Tue 30/6

22:40-20:20

1 stop15h 40m

£472

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 20/1

08:20-16:14

1 stop13h 54m

Lambert-St Louis

Tue 27/1

12:11-06:30

1 stop12h 19m

£528

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 20/1

17:00-09:03

2 stops22h 03m

Lambert-St Louis

Tue 27/1

14:54-09:40

2 stops12h 46m

£537

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 22/1

07:30-21:15

2 stops19h 45m

Lambert-St Louis

Mon 26/1

17:04-12:15

1 stop13h 11m

£557

LondonMoline

LHR - MLI

LHRMLI

London Heathrow

Thu 22/1

07:30-21:36

2 stops20h 06m

Moline Quad-City

Fri 30/1

17:29-11:15

1 stop11h 46m

£834

LondonMoline

LHR - MLI

LHRMLI

London Heathrow

Thu 22/1

13:35-21:36

1 stop14h 01m

Moline Quad-City

Fri 30/1

17:29-11:15

1 stop11h 46m

£868

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 £440. 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 £446.

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 £617. 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 £671. 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 £560. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £668 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 £544 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 £522 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 1% 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

£485

Fastest flight time

8h 25m

Direct flights

Every day

Airports in Illinois

2 airports
The best one-way flight to Illinois from London Heathrow Airport in the past 72 hours is £485. The best return flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is £537.
The fastest flight from London Heathrow Airport to Illinois takes 8h 25m
Direct flights go from London Heathrow Airport to Illinois every day.
There are 2 airports near Illinois: Chicago O'Hare Intl (ORD), Lambert-St Louis (STL)
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
588 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £347Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
Scandinavian AirlinesPriceFrom £362Free CancellationRating
7.4
1,600 reviews
Search Scandinavian Airlines flights
Aer LingusPriceFrom £367Free CancellationRating
7.2
1,389 reviews
Search Aer Lingus flights
TAP AIR PORTUGALPriceFrom £371Free CancellationRating
7.1
2,085 reviews
Search TAP AIR PORTUGAL flights
Brussels AirlinesPriceFrom £388Free CancellationRating
7.2
375 reviews
Search Brussels Airlines flights
LufthansaPriceFrom £397Free CancellationRating
6.8
7,618 reviews
Search Lufthansa flights
British AirwaysPriceFrom £405Free CancellationRating
6.7
7,567 reviews
Search British Airways flights
Austrian AirlinesPriceFrom £407Free CancellationRating
7.6
879 reviews
Search Austrian Airlines flights
United AirlinesPriceFrom £412Free CancellationRating
7.4
9,084 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.

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