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Cheap flights from London Heathrow Airport to Illinois from £345

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 16/3. 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
07:05 - 16:45
LHR
-
ORD
15h 40m
2 stops
Scandinavian Airlines Logo
19:20 - 16:25
ORD
-
LHR
15h 05m
2 stops
£387Scandinavian Airlines
Thu, 26 Feb - Mon, 2 Mar
Icelandair Logo
12:15 - 18:20
LHR
-
ORD
11h 05m
1 stop
Icelandair Logo
19:30 - 10:50
ORD
-
LHR
10h 20m
1 stop
£388Icelandair
Wed, 11 Mar - Wed, 25 Mar
British Airways Logo
09:55 - 18:52
LHR
-
STL
13h 57m
1 stop
British Airways Logo
14:06 - 07:20
STL
-
LHR
12h 14m
1 stop
£529British Airways
Tue, 17 Mar - Tue, 24 Mar
Finnair Logo
09:55 - 18:07
LHR
-
STL
13h 12m
1 stop
Finnair Logo
10:33 - 07:00
STL
-
LHR
15h 27m
2 stops
£536Finnair
Wed, 18 Mar - Wed, 25 Mar
Finnair Logo
15:35 - 11:29
LHR
-
STL
24h 54m
2 stops
Finnair Logo
18:37 - 10:25
STL
-
LHR
10h 48m
1 stop
£537Finnair
Tue, 17 Mar - Tue, 24 Mar
British Airways Logo
09:55 - 19:30
LHR
-
STL
14h 35m
1 stop
British Airways Logo
16:13 - 10:00
STL
-
LHR
12h 47m
1 stop
£551British Airways
Wed, 18 Mar - Wed, 25 Mar
United Airlines Logo
13:45 - 22:20
LHR
-
PIA
37h 35m
2 stops
United Airlines Logo
17:25 - 05:55
PIA
-
LHR
31h 30m
1 stop
£802United Airlines
Wed, 18 Mar - Sun, 22 Mar
United Airlines Logo
09:00 - 12:43
LHR
-
PIA
32h 43m
2 stops
United Airlines Logo
17:25 - 05:55
PIA
-
LHR
31h 30m
1 stop
£805United Airlines
Wed, 18 Mar - Sun, 22 Mar
Lufthansa Logo
07:40 - 16:47
LHR
-
MLI
15h 07m
2 stops
Lufthansa Logo
18:29 - 11:45
MLI
-
LHR
11h 16m
1 stop
£887Lufthansa
Mon, 2 Mar - Thu, 28 May
Lufthansa Logo
07:25 - 17:10
LHR
-
PIA
15h 45m
1 stop
Lufthansa Logo
13:25 - 18:45
PIA
-
LHR
23h 20m
2 stops
£1,207Lufthansa
Tue, 17 Feb - Sat, 21 Feb

Scandinavian Airlines flights from London Heathrow Airport to Illinois

Our best Scandinavian Airlines deals on London Heathrow Airport to Illinois flight tickets
Scandinavian Airlines
26 Feb
LHR07:05London Heathrow
15h 40m
2 stops
ORD16:45Chicago O'Hare Intl
2 Mar
ORD19:20Chicago O'Hare Intl
15h 05m
2 stops
LHR16:25London Heathrow
£387
Scandinavian Airlines
2 Mar
LHR10:20London Heathrow
12h 25m
1 stop
ORD16:45Chicago O'Hare Intl
16 Mar
ORD20:20Chicago O'Hare Intl
14h 40m
1 stop
LHR16:00London Heathrow
£388
Scandinavian Airlines
26 Feb
LHR06:40London Heathrow
16h 05m
1 stop
ORD16:45Chicago O'Hare Intl
2 Mar
ORD19:20Chicago O'Hare Intl
17h 30m
2 stops
LHR18:50London Heathrow
£389

Icelandair flights from London Heathrow Airport to Illinois

Our best Icelandair deals on London Heathrow Airport to Illinois flight tickets
Icelandair
11 Mar
LHR12:15London Heathrow
11h 05m
1 stop
ORD18:20Chicago O'Hare Intl
25 Mar
ORD19:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£388
Icelandair
17 Mar
LHR12:15London Heathrow
11h 05m
1 stop
ORD18:20Chicago O'Hare Intl
25 Mar
ORD19:30Chicago O'Hare Intl
10h 20m
1 stop
LHR10:50London Heathrow
£400
Icelandair
16 Apr
LHR13:05London Heathrow
11h 10m
1 stop
ORD18:15Chicago O'Hare Intl
25 Apr
ORD19:25Chicago O'Hare Intl
10h 30m
1 stop
LHR11:55London Heathrow
£401

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 2 February 2026.
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

Thu 26/2

07:05-16:45

2 stops15h 40m

Chicago O'Hare Intl

Mon 2/3

19:20-16:25

2 stops15h 05m

£387

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/3

12:15-18:20

1 stop11h 05m

Chicago O'Hare Intl

Wed 25/3

19:30-10:50

1 stop10h 20m

£388

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

09:55-18:52

1 stop13h 57m

Lambert-St Louis

Tue 24/3

14:06-07:20

1 stop12h 14m

£529

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

09:55-18:07

1 stop13h 12m

Lambert-St Louis

Wed 25/3

10:33-07:00

2 stops15h 27m

£536

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

15:35-11:29

2 stops24h 54m

Lambert-St Louis

Tue 24/3

18:37-10:25

1 stop10h 48m

£537

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

09:55-19:30

1 stop14h 35m

Lambert-St Louis

Wed 25/3

16:13-10:00

1 stop12h 47m

£551

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Wed 18/3

13:45-22:20

2 stops37h 35m

Greater Peoria

Sun 22/3

17:25-05:55

1 stop31h 30m

£802

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Wed 18/3

09:00-12:43

2 stops32h 43m

Greater Peoria

Sun 22/3

17:25-05:55

1 stop31h 30m

£805

LondonMoline

LHR - MLI

LHRMLI

London Heathrow

Mon 2/3

07:40-16:47

2 stops15h 07m

Moline Quad-City

Thu 28/5

18:29-11:45

1 stop11h 16m

£887

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Tue 17/2

07:25-17:10

1 stop15h 45m

Greater Peoria

Sat 21/2

13:25-18:45

2 stops23h 20m

£1,207

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 £429. 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 £435.

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 £608. 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 £647. 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 at midday. Our users have found flights to Illinois at midday for as low as £622. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £657 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 £530 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 £506 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.

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

£415

Fastest flight time

8h 40m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from London Heathrow Airport in the past 72 hours is £415. The best return flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is £481.
The fastest flight from London Heathrow Airport to Illinois takes 8h 40m
Direct flights go from London Heathrow Airport to Illinois every day.
There are 98 airports in Illinois. From London Heathrow Airport there are direct flights to 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 £332Free CancellationRating
7.1
606 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £338Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
Scandinavian AirlinesPriceFrom £352Free CancellationRating
7.3
1,676 reviews
Search Scandinavian Airlines flights
Aer LingusPriceFrom £357Free CancellationRating
7.2
1,444 reviews
Search Aer Lingus flights
TAP AIR PORTUGALPriceFrom £375Free CancellationRating
7.1
2,132 reviews
Search TAP AIR PORTUGAL flights
Brussels AirlinesPriceFrom £378Free CancellationRating
7.2
381 reviews
Search Brussels Airlines flights
LufthansaPriceFrom £387Free CancellationRating
6.8
7,758 reviews
Search Lufthansa flights
Austrian AirlinesPriceFrom £393Free CancellationRating
7.5
896 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom £394Free CancellationRating
6.7
7,709 reviews
Search British Airways flights
United AirlinesPriceFrom £401Free CancellationRating
7.4
9,229 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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