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Cheap flights from London Heathrow Airport to Illinois from £392

This is the cheapest return 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 30/11. 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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Find the cheapest flights from London Heathrow Airport to Illinois

Cheap return flights

Multiple Airlines Logo
19:25 - 14:00LHR-ORD
24h 35m1 stop
Multiple Airlines Logo
17:50 - 07:55ORD-LHR
8h 05mdirect
£392Multiple Airlines
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Sun, 30 Nov - Fri, 20 Feb
United Airlines Logo
06:50 - 13:10LHR-ORD
11h 20m1 stop
United Airlines Logo
15:45 - 05:55ORD-LHR
8h 10mdirect
£392United Airlines
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Sat, 1 Nov - Fri, 14 Nov
Lufthansa Logo
14:10 - 17:20LHR-ORD
9h 10mdirect
Lufthansa Logo
16:00 - 06:20ORD-LHR
8h 20mdirect
£394Lufthansa
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Tue, 7 Oct - Sun, 12 Oct
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
Icelandair Logo
18:30 - 19:30ORD-LHR
19h 00m1 stop
£397Icelandair
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Sun, 14 Dec - Thu, 15 Jan
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
Icelandair Logo
18:30 - 10:50ORD-LHR
10h 20m1 stop
£397Icelandair
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Mon, 10 Nov - Mon, 17 Nov
British Airways Logo
12:35 - 16:15LHR-ORD
8h 40mdirect
British Airways Logo
17:10 - 06:55ORD-LHR
7h 45mdirect
£398British Airways
Find Deal
Sat, 1 Nov - Fri, 14 Nov
British Airways Logo
12:35 - 16:15LHR-ORD
8h 40mdirect
British Airways Logo
21:45 - 11:35ORD-LHR
7h 50mdirect
£399British Airways
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Sat, 1 Nov - Fri, 14 Nov
Finnair Logo
14:10 - 06:51LHR-ORD
22h 41m2 stops
Finnair Logo
07:00 - 06:20ORD-LHR
17h 20m2 stops
£404Finnair
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Tue, 30 Sep - Tue, 14 Oct
Finnair Logo
09:45 - 21:20LHR-ORD
17h 35m2 stops
Finnair Logo
18:35 - 12:30ORD-LHR
11h 55m1 stop
£405Finnair
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Mon, 29 Sep - Sun, 5 Oct
Lufthansa Logo
10:25 - 14:45LHR-ORD
9h 20mdirect
Lufthansa Logo
15:45 - 05:55ORD-LHR
8h 10mdirect
£407Lufthansa
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Tue, 28 Oct - Tue, 4 Nov

United Airlines flights from London Heathrow Airport to Illinois

Our best United Airlines deals on London Heathrow Airport to Illinois flight tickets
United Airlines
25 Sept
LHR07:30London Heathrow
13h 25m
1 stop
ORD14:55Chicago O'Hare Intl
11 Oct
ORD16:00Chicago O'Hare Intl
8h 20m
LHR06:20London Heathrow
£392
Find similar
United Airlines
1 Nov
LHR06:50London Heathrow
11h 20m
1 stop
ORD13:10Chicago O'Hare Intl
14 Nov
ORD15:45Chicago O'Hare Intl
8h 10m
LHR05:55London Heathrow
£392
Find similar
United Airlines
1 Oct
LHR07:45London Heathrow
14h 50m
2 stops
ORD16:35Chicago O'Hare Intl
12 Oct
ORD07:11Chicago O'Hare Intl
17h 19m
1 stop
LHR06:30London Heathrow
£395
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
14 Nov
LHR06:40London Heathrow
16h 05m
1 stop
ORD16:45Chicago O'Hare Intl
29 Nov
ORD19:20Chicago O'Hare Intl
15h 05m
2 stops
LHR16:25London Heathrow
£394
Find similar
Scandinavian Airlines
30 Oct
LHR10:20London Heathrow
13h 25m
1 stop
ORD18:45Chicago O'Hare Intl
2 Nov
ORD19:20Chicago O'Hare Intl
17h 30m
2 stops
LHR18:50London Heathrow
£400
Find similar
Scandinavian Airlines
30 Oct
LHR10:20London Heathrow
13h 25m
1 stop
ORD18:45Chicago O'Hare Intl
6 Nov
ORD19:20Chicago O'Hare Intl
17h 30m
2 stops
LHR18:50London Heathrow
£402
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 17 September 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

Sun 30/11

19:25-14:00

1 stop24h 35m

Chicago O'Hare Intl

Fri 20/2

17:50-07:55

Nonstop8h 05m

£392

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 1/11

06:50-13:10

1 stop11h 20m

Chicago O'Hare Intl

Fri 14/11

15:45-05:55

Nonstop8h 10m

£392

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 7/10

14:10-17:20

Nonstop9h 10m

Chicago O'Hare Intl

Sun 12/10

16:00-06:20

Nonstop8h 20m

£394

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 14/12

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Thu 15/1

18:30-19:30

1 stop19h 00m

£397

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 10/11

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Mon 17/11

18:30-10:50

1 stop10h 20m

£397

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 1/11

12:35-16:15

Nonstop8h 40m

Chicago O'Hare Intl

Fri 14/11

17:10-06:55

Nonstop7h 45m

£398

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 1/11

12:35-16:15

Nonstop8h 40m

Chicago O'Hare Intl

Fri 14/11

21:45-11:35

Nonstop7h 50m

£399

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 30/9

14:10-06:51

2 stops22h 41m

Chicago O'Hare Intl

Tue 14/10

07:00-06:20

2 stops17h 20m

£404

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 29/9

09:45-21:20

2 stops17h 35m

Chicago O'Hare Intl

Sun 5/10

18:35-12:30

1 stop11h 55m

£405

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 28/10

10:25-14:45

Nonstop9h 20m

Chicago O'Hare Intl

Tue 4/11

15:45-05:55

Nonstop8h 10m

£407

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 £437. If you aren’t able to travel to Illinois during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of £441.

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 £597. 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 £653. 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 £548. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £654 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 £531 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 £508 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 7% 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

£489

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 £489. The best return flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is £492.
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 £337Free CancellationRating
7.0
544 reviews
Search Icelandair flights
Scandinavian AirlinesPriceFrom £349Free CancellationRating
7.4
1,486 reviews
Search Scandinavian Airlines flights
TAP AIR PORTUGALPriceFrom £363Free CancellationRating
7.1
1,975 reviews
Search TAP AIR PORTUGAL flights
Aer LingusPriceFrom £363Free CancellationRating
7.2
1,274 reviews
Search Aer Lingus flights
Virgin AtlanticPriceFrom £375Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
Brussels AirlinesPriceFrom £388Free CancellationRating
7.2
359 reviews
Search Brussels Airlines flights
LufthansaPriceFrom £390Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights
Austrian AirlinesPriceFrom £395Free CancellationRating
7.6
850 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom £399Free CancellationRating
6.7
7,363 reviews
Search British Airways flights
United AirlinesPriceFrom £403Free CancellationRating
7.4
8,924 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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