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Cheap flights from Illinois to London from £225

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to London departing on 2/2. 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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Cheap return flights

Enter your travel dates to find the best prices.
Icelandair Logo
19:25 - 20:20
ORD
-
LHR
18h 55m
1 stop
Icelandair Logo
13:05 - 18:15
LHR
-
ORD
11h 10m
1 stop
£386Icelandair
Tue, 21 Apr - Wed, 6 May
Scandinavian Airlines Logo
19:20 - 16:25
ORD
-
LHR
15h 05m
2 stops
Scandinavian Airlines Logo
19:30 - 16:45
LHR
-
ORD
27h 15m
1 stop
£386Scandinavian Airlines
Sat, 28 Feb - Sun, 1 Mar
Icelandair Logo
19:25 - 11:55
ORD
-
LHR
10h 30m
1 stop
Icelandair Logo
21:25 - 18:15
LHR
-
ORD
26h 50m
1 stop
£387Icelandair
Wed, 1 Apr - Tue, 12 May
British Airways Logo
13:30 - 10:30
PIA
-
LHR
15h 00m
1 stop
British Airways Logo
06:15 - 18:24
LHR
-
PIA
18h 09m
2 stops
£447British Airways
Mon, 27 Apr - Wed, 13 May
British Airways Logo
14:59 - 10:25
PIA
-
LHR
13h 26m
1 stop
British Airways Logo
12:35 - 18:25
LHR
-
PIA
11h 50m
1 stop
£450British Airways
Wed, 25 Feb - Fri, 6 Mar
Delta Logo
05:55 - 06:25
MLI
-
LHR
18h 30m
1 stop
Delta Logo
06:30 - 22:30
LHR
-
MLI
21h 00m
2 stops
£470Delta
Thu, 5 Mar - Thu, 12 Mar
Delta Logo
06:00 - 06:25
BMI
-
LHR
18h 25m
1 stop
Delta Logo
08:40 - 22:19
LHR
-
BMI
18h 39m
2 stops
£470Delta
Thu, 5 Mar - Thu, 12 Mar
Virgin Atlantic Logo
05:55 - 10:50
MLI
-
LHR
22h 55m
2 stops
Virgin Atlantic Logo
08:40 - 22:30
LHR
-
MLI
18h 50m
2 stops
£473Virgin Atlantic
Thu, 5 Mar - Thu, 12 Mar
Virgin Atlantic Logo
10:49 - 06:25
MDW
-
LHR
13h 36m
1 stop
Virgin Atlantic Logo
06:30 - 17:45
LHR
-
MDW
17h 15m
2 stops
£475Virgin Atlantic
Wed, 18 Feb - Tue, 24 Feb
Finnair Logo
12:27 - 12:10
STL
-
LHR
17h 43m
1 stop
Finnair Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
£476Finnair
Mon, 20 Apr - Sun, 26 Apr

British Airways flights from Illinois to London Heathrow Airport

Our best British Airways deals on Illinois to London Heathrow Airport flight tickets
British Airways
17 Apr
ORD22:35Chicago O'Hare Intl
7h 40m
LHR12:15London Heathrow
19 Apr
LHR07:55London Heathrow
14h 05m
1 stop
ORD16:00Chicago O'Hare Intl
£405
British Airways
18 Feb
ORD17:10Chicago O'Hare Intl
7h 45m
LHR06:55London Heathrow
25 Feb
LHR12:50London Heathrow
12h 25m
1 stop
ORD19:15Chicago O'Hare Intl
£413
British Airways
28 Jan
ORD21:45Chicago O'Hare Intl
7h 50m
LHR11:35London Heathrow
3 Feb
LHR09:50London Heathrow
15h 25m
1 stop
ORD19:15Chicago O'Hare Intl
£418

SWISS flights from Illinois to London Heathrow Airport

Our best SWISS deals on Illinois to London Heathrow Airport flight tickets
SWISS
17 Feb
ORD18:50Chicago O'Hare Intl
12h 10m
1 stop
LHR13:00London Heathrow
24 Feb
LHR20:05London Heathrow
26h 15m
1 stop
ORD16:20Chicago O'Hare Intl
£407
SWISS
28 Jan
ORD18:50Chicago O'Hare Intl
12h 10m
1 stop
LHR13:00London Heathrow
2 Feb
LHR18:40London Heathrow
27h 40m
1 stop
ORD16:20Chicago O'Hare Intl
£415
SWISS
1 Feb
ORD18:50Chicago O'Hare Intl
12h 10m
1 stop
LHR13:00London Heathrow
10 Feb
LHR09:00London Heathrow
13h 20m
1 stop
ORD16:20Chicago O'Hare Intl
£427

momondo Fare Finder

 
Customise your flight search to find flights from Illinois to London Heathrow Airport 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 22 January 2026.
Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 21/4

19:25-20:20

1 stop18h 55m

London Heathrow

Wed 6/5

13:05-18:15

1 stop11h 10m

£386

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 28/2

19:20-16:25

2 stops15h 05m

London Heathrow

Sun 1/3

19:30-16:45

1 stop27h 15m

£386

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 1/4

19:25-11:55

1 stop10h 30m

London Heathrow

Tue 12/5

21:25-18:15

1 stop26h 50m

£387

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

Mon 27/4

13:30-10:30

1 stop15h 00m

London Heathrow

Wed 13/5

06:15-18:24

2 stops18h 09m

£447

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

Wed 25/2

14:59-10:25

1 stop13h 26m

London Heathrow

Fri 6/3

12:35-18:25

1 stop11h 50m

£450

MolineLondon

MLI - LHR

MLILHR

Moline Quad-City

Thu 5/3

05:55-06:25

1 stop18h 30m

London Heathrow

Thu 12/3

06:30-22:30

2 stops21h 00m

£470

BloomingtonLondon

BMI - LHR

BMILHR

Bloomington-Normal

Thu 5/3

06:00-06:25

1 stop18h 25m

London Heathrow

Thu 12/3

08:40-22:19

2 stops18h 39m

£470

MolineLondon

MLI - LHR

MLILHR

Moline Quad-City

Thu 5/3

05:55-10:50

2 stops22h 55m

London Heathrow

Thu 12/3

08:40-22:30

2 stops18h 50m

£473

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 18/2

10:49-06:25

1 stop13h 36m

London Heathrow

Tue 24/2

06:30-17:45

2 stops17h 15m

£475

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 20/4

12:27-12:10

1 stop17h 43m

London Heathrow

Sun 26/4

16:25-19:30

Nonstop9h 05m

£476

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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How to get the cheapest flight ticket from Illinois to London Heathrow Airport

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 London Heathrow Airport?

In general, October is the cheapest month to fly from Illinois to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £479. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from Illinois averaging around £482.

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Illinois is on a Sunday. momondo users have found tickets for Sunday departures for as low as £503. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £658.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Illinois to London Heathrow Airport in the evening for as low as £564. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £577 on average. Flights to London Heathrow Airport from Illinois in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Illinois to London Heathrow flight route?

Fly from Chicago O'Hare Intl to London Heathrow for the best Illinois - London Heathrow flight prices

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £583 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Illinois for as low as £512 on momondo.

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

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

You could potentially save up to 2% on your flight if you consider stops on a Illinois to London Heathrow Airport flight.

Cheap Illinois to London Heathrow Airport flight deals and tips

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

Best price found

£333

Fastest flight time

7h 40m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Illinois in the past 72 hours is £333. The best return flight deal from Illinois to London Heathrow Airport found on momondo in the last 72 hours is £537.
The fastest flight from Illinois to London Heathrow Airport takes 7h 40m
Direct flights go from Illinois to London Heathrow Airport every day.
Search flight deals

  • When did momondo last update prices for flights from Illinois to London Heathrow Airport?

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

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents required for your trip to London Heathrow Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

Best airlines flying from Illinois to London Heathrow Airport

Compare and see reviews for airlines that fly from Illinois to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom £358Free CancellationRating
6.8
7,738 reviews
Search Lufthansa flights
American AirlinesPriceFrom £385Free CancellationRating
7.2
11,174 reviews
Search American Airlines flights
FinnairPriceFrom £414Free CancellationRating
7.6
1,353 reviews
Search Finnair flights
British AirwaysPriceFrom £423Free CancellationRating
6.7
7,689 reviews
Search British Airways flights
Aer LingusPriceFrom £449Free CancellationRating
7.2
1,441 reviews
Search Aer Lingus flights
IberiaPriceFrom £454Free CancellationRating
7.0
3,094 reviews
Search Iberia flights
United AirlinesPriceFrom £462Free CancellationRating
7.4
9,190 reviews
Search United Airlines flights

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Luton
Milton Keynes
Gatwick
Maidstone
Slough
Northampton
Stratford-upon-Avon
Swindon
Southend-on-Sea
Canterbury
Ipswich
Ilford
Poole
Guildford
Chelmsford
Hayes
Swanage
Dover
Bedford

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to London for you.

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

All flight searches from Illinois to London on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search for Illinois to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Illinois to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

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