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Cheap flights from Illinois to London from £170

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 26/10. 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

Icelandair Logo
19:25 - 11:55ORD-LHR
10h 30m1 stop
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
£373Icelandair
Find Deal
Sat, 20 Sep - Sun, 9 Nov
Scandinavian Airlines Logo
19:20 - 16:25ORD-LHR
15h 05m2 stops
Scandinavian Airlines Logo
07:05 - 16:45LHR-ORD
15h 40m2 stops
£374Scandinavian Airlines
Find Deal
Fri, 7 Nov - Thu, 13 Nov
Virgin Atlantic Logo
09:41 - 07:05MDW-LHR
15h 24m1 stop
Virgin Atlantic Logo
11:05 - 18:07LHR-MDW
13h 02m1 stop
£375Virgin Atlantic
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Tue, 25 Nov - Thu, 4 Dec
Iberia Logo
17:10 - 06:55ORD-LHR
7h 45mdirect
Iberia Logo
19:05 - 14:30LHR-ORD
25h 25m1 stop
£380Iberia
Find Deal
Mon, 1 Dec - Tue, 9 Dec
Delta Logo
13:25 - 06:25ORD-LHR
11h 00m1 stop
Delta Logo
06:15 - 15:00LHR-ORD
14h 45m1 stop
£382Delta
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Mon, 8 Sep - Tue, 16 Sep
Iberia Logo
20:40 - 10:30ORD-LHR
7h 50mdirect
Iberia Logo
20:00 - 14:15LHR-ORD
24h 15m1 stop
£383Iberia
Find Deal
Mon, 8 Sep - Tue, 16 Sep
Finnair Logo
17:10 - 06:55ORD-LHR
7h 45mdirect
Finnair Logo
15:45 - 18:45LHR-ORD
9h 00mdirect
£384Finnair
Find Deal
Wed, 11 Feb - Tue, 17 Feb
Virgin Atlantic Logo
10:36 - 06:25ORD-LHR
13h 49m1 stop
Virgin Atlantic Logo
08:55 - 16:10LHR-ORD
12h 15m1 stop
£385Virgin Atlantic
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Wed, 22 Oct - Thu, 30 Oct
Finnair Logo
13:12 - 10:00ORD-LHR
14h 48m1 stop
Finnair Logo
14:10 - 17:00LHR-ORD
8h 50mdirect
£389Finnair
Find Deal
Wed, 11 Feb - Tue, 17 Feb
Delta Logo
10:20 - 08:55STL-LHR
16h 35m2 stops
Delta Logo
06:15 - 16:37LHR-STL
16h 22m2 stops
£391Delta
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Tue, 9 Sep - Tue, 23 Sep

British Airways flights from Illinois to London Heathrow Airport

Our best British Airways deals on Illinois to London Heathrow Airport flight tickets
British Airways
7 Sept
ORD20:40Chicago O'Hare Intl
7h 50m
LHR10:30London Heathrow
16 Sept
LHR13:10London Heathrow
8h 45m
ORD15:55Chicago O'Hare Intl
£385
Find similar
British Airways
9 Sept
STL14:11Lambert-St Louis
11h 29m
1 stop
LHR07:40London Heathrow
23 Sept
LHR10:30London Heathrow
13h 52m
1 stop
STL18:22Lambert-St Louis
£392
Find similar
British Airways
22 Sept
ORD20:40Chicago O'Hare Intl
7h 50m
LHR10:30London Heathrow
30 Sept
LHR09:15London Heathrow
8h 35m
ORD11:50Chicago O'Hare Intl
£400
Find similar

Icelandair flights from Illinois to London Heathrow Airport

Our best Icelandair deals on Illinois to London Heathrow Airport flight tickets
Icelandair
20 Sept
ORD19:25Chicago O'Hare Intl
10h 30m
1 stop
LHR11:55London Heathrow
9 Nov
LHR12:15London Heathrow
11h 05m
1 stop
ORD17:20Chicago O'Hare Intl
£373
Find similar
Icelandair
22 Sept
ORD19:25Chicago O'Hare Intl
10h 30m
1 stop
LHR11:55London Heathrow
30 Sept
LHR21:25London Heathrow
26h 50m
1 stop
ORD18:15Chicago O'Hare Intl
£374
Find similar
Icelandair
17 Oct
ORD19:25Chicago O'Hare Intl
10h 30m
1 stop
LHR11:55London Heathrow
26 Oct
LHR20:35London Heathrow
26h 45m
1 stop
ORD18:20Chicago O'Hare Intl
£376
Find similar

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 26 August 2025.
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

Sat 20/9

19:25-11:55

1 stop10h 30m

London Heathrow

Sun 9/11

12:15-17:20

1 stop11h 05m

£373

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 7/11

19:20-16:25

2 stops15h 05m

London Heathrow

Thu 13/11

07:05-16:45

2 stops15h 40m

£374

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 25/11

09:41-07:05

1 stop15h 24m

London Heathrow

Thu 4/12

11:05-18:07

1 stop13h 02m

£375

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 1/12

17:10-06:55

Nonstop7h 45m

London Heathrow

Tue 9/12

19:05-14:30

1 stop25h 25m

£380

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 8/9

13:25-06:25

1 stop11h 00m

London Heathrow

Tue 16/9

06:15-15:00

1 stop14h 45m

£382

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 8/9

20:40-10:30

Nonstop7h 50m

London Heathrow

Tue 16/9

20:00-14:15

1 stop24h 15m

£383

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/2

17:10-06:55

Nonstop7h 45m

London Heathrow

Tue 17/2

15:45-18:45

Nonstop9h 00m

£384

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/10

10:36-06:25

1 stop13h 49m

London Heathrow

Thu 30/10

08:55-16:10

1 stop12h 15m

£385

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/2

13:12-10:00

1 stop14h 48m

London Heathrow

Tue 17/2

14:10-17:00

Nonstop8h 50m

£389

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

10:20-08:55

2 stops16h 35m

London Heathrow

Tue 23/9

06:15-16:37

2 stops16h 22m

£391

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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, February 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 £497. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Illinois averaging around £498.

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 Thursday. momondo users have found tickets for Thursday departures for as low as £515. 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 £657.

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 morning. momondo users have found flights departing from Illinois to London Heathrow Airport in the morning for as low as £498. 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 evening when prices are £576 on average. Flights to London Heathrow Airport from Illinois in the evening 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 £587 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 £520 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 36% 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

£295

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 £295. The best return flight deal from Illinois to London Heathrow Airport found on momondo in the last 72 hours is £380.
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 £357Free CancellationRating
6.8
7,359 reviews
Search Lufthansa flights
FinnairPriceFrom £412Free CancellationRating
7.6
1,320 reviews
Search Finnair flights
IberiaPriceFrom £444Free CancellationRating
7.0
2,891 reviews
Search Iberia flights
Aer LingusPriceFrom £447Free CancellationRating
7.2
1,237 reviews
Search Aer Lingus flights
British AirwaysPriceFrom £457Free CancellationRating
6.7
7,309 reviews
Search British Airways flights
United AirlinesPriceFrom £460Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
American AirlinesPriceFrom £497Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Travelling to a place near London?

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

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.

An easier way to manage your London Heathrow Airport trip

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