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Cheap flights from Chicago to London from £168

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to London departing on 18/10. 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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Find the cheapest flights from Chicago to London (CHI-LHR)

Cheap return flights

Icelandair Logo
19:25 - 11:55ORD-LHR
10h 30m1 stop
Icelandair Logo
21:25 - 21:15LHR-ORD
29h 50m1 stop
£373Icelandair
Find Deal
Fri, 19 Sep - Tue, 30 Sep
Icelandair Logo
22:15 - 20:20ORD-LHR
16h 05m1 stop
Icelandair Logo
21:25 - 18:15LHR-ORD
26h 50m1 stop
£374Icelandair
Find Deal
Sun, 28 Sep - Sun, 12 Oct
Scandinavian Airlines Logo
19:20 - 16:00ORD-LHR
14h 40m1 stop
Scandinavian Airlines Logo
15:35 - 16:45LHR-ORD
31h 10m2 stops
£375Scandinavian Airlines
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Sun, 23 Nov - Tue, 2 Dec
Scandinavian Airlines Logo
19:15 - 16:00ORD-LHR
14h 45m1 stop
Scandinavian Airlines Logo
18:40 - 16:45LHR-ORD
28h 05m1 stop
£376Scandinavian Airlines
Find Deal
Mon, 20 Oct - Tue, 4 Nov
Iberia Logo
22:35 - 12:15ORD-LHR
7h 40mdirect
Iberia Logo
15:50 - 14:15LHR-ORD
28h 25m1 stop
£381Iberia
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Wed, 8 Oct - Tue, 14 Oct
British Airways Logo
18:55 - 12:30ORD-LHR
11h 35m1 stop
British Airways Logo
08:55 - 17:52LHR-ORD
14h 57m1 stop
£383British Airways
Find Deal
Wed, 10 Sep - Wed, 8 Oct
Iberia Logo
15:10 - 07:50ORD-LHR
10h 40m1 stop
Iberia Logo
11:25 - 15:30LHR-ORD
33h 05m1 stop
£384Iberia
Find Deal
Tue, 14 Oct - Tue, 28 Oct
Finnair Logo
20:40 - 10:30ORD-LHR
7h 50mdirect
Finnair Logo
09:15 - 11:50LHR-ORD
8h 35mdirect
£386Finnair
Find Deal
Sun, 7 Sep - Tue, 16 Sep
British Airways Logo
16:55 - 06:50ORD-LHR
7h 55mdirect
British Airways Logo
11:10 - 13:55LHR-ORD
8h 45mdirect
£389British Airways
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Tue, 30 Sep - Thu, 16 Oct
Finnair Logo
22:35 - 12:15ORD-LHR
7h 40mdirect
Finnair Logo
10:30 - 19:40LHR-ORD
15h 10m1 stop
£391Finnair
Find Deal
Sun, 21 Sep - Tue, 7 Oct

British Airways flights from Chicago to London Heathrow Airport

Our best British Airways deals on Chicago to London Heathrow Airport flight tickets
British Airways
10 Sept
ORD18:55Chicago O'Hare Intl
11h 35m
1 stop
LHR12:30London Heathrow
8 Oct
LHR08:55London Heathrow
14h 57m
1 stop
ORD17:52Chicago O'Hare Intl
£383
Find similar
British Airways
26 Aug
ORD16:55Chicago O'Hare Intl
7h 55m
LHR06:50London Heathrow
23 Sept
LHR12:15London Heathrow
8h 35m
ORD14:50Chicago O'Hare Intl
£384
Find similar
British Airways
3 Sept
ORD22:35Chicago O'Hare Intl
7h 40m
LHR12:15London Heathrow
10 Sept
LHR13:10London Heathrow
8h 45m
ORD15:55Chicago O'Hare Intl
£384
Find similar

Finnair flights from Chicago to London Heathrow Airport

Our best Finnair deals on Chicago to London Heathrow Airport flight tickets
Finnair
7 Sept
ORD20:40Chicago O'Hare Intl
7h 50m
LHR10:30London Heathrow
16 Sept
LHR09:15London Heathrow
8h 35m
ORD11:50Chicago O'Hare Intl
£386
Find similar
Finnair
1 Sept
ORD16:55Chicago O'Hare Intl
7h 55m
LHR06:50London Heathrow
17 Sept
LHR12:15London Heathrow
8h 35m
ORD14:50Chicago O'Hare Intl
£389
Find similar
Finnair
21 Sept
ORD22:35Chicago O'Hare Intl
7h 40m
LHR12:15London Heathrow
7 Oct
LHR10:30London Heathrow
15h 10m
1 stop
ORD19:40Chicago O'Hare Intl
£391
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Chicago 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 21 August 2025.
Use the filters below to find and compare flights from Chicago 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

Fri 19/9

19:25-11:55

1 stop10h 30m

London Heathrow

Tue 30/9

21:25-21:15

1 stop29h 50m

£373

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 28/9

22:15-20:20

1 stop16h 05m

London Heathrow

Sun 12/10

21:25-18:15

1 stop26h 50m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 23/11

19:20-16:00

1 stop14h 40m

London Heathrow

Tue 2/12

15:35-16:45

2 stops31h 10m

£375

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 20/10

19:15-16:00

1 stop14h 45m

London Heathrow

Tue 4/11

18:40-16:45

1 stop28h 05m

£376

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 8/10

22:35-12:15

Nonstop7h 40m

London Heathrow

Tue 14/10

15:50-14:15

1 stop28h 25m

£381

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 10/9

18:55-12:30

1 stop11h 35m

London Heathrow

Wed 8/10

08:55-17:52

1 stop14h 57m

£383

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 14/10

15:10-07:50

1 stop10h 40m

London Heathrow

Tue 28/10

11:25-15:30

1 stop33h 05m

£384

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 7/9

20:40-10:30

Nonstop7h 50m

London Heathrow

Tue 16/9

09:15-11:50

Nonstop8h 35m

£386

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

16:55-06:50

Nonstop7h 55m

London Heathrow

Thu 16/10

11:10-13:55

Nonstop8h 45m

£389

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 21/9

22:35-12:15

Nonstop7h 40m

London Heathrow

Tue 7/10

10:30-19:40

1 stop15h 10m

£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 Chicago 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 Chicago to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £498. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Chicago averaging around £499.

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 Chicago is on a Thursday. momondo users have found tickets for Thursday departures for as low as £517. 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 £659.

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 Chicago to London Heathrow Airport in the morning for as low as £502. 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 £579 on average. Flights to London Heathrow Airport from Chicago in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Chicago to London Heathrow flight route?

Fly from Chicago O'Hare Intl to London Heathrow for the best Chicago - 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 Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £589 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 Chicago for as low as £519 on momondo.

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

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

You could potentially save up to 36% on your flight if you consider stops on a Chicago to London Heathrow Airport flight.

How have Chicago to London Heathrow Airport flight prices changed over time?

As of August 2025, prices for Chicago to London Heathrow Airport flights are approximately 6% cheaper when compared to flights at the same time last year.

When to book flights from Chicago to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Chicago to London Heathrow Airport (CHI to LHR) flight deals and tips

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

Best price found

£310

Fastest flight time

7h 40m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Chicago in the past 72 hours is £310. The best return flight deal from Chicago to London Heathrow Airport found on momondo in the last 72 hours is £373.
The fastest flight from Chicago to London Heathrow Airport takes 7h 40m
Direct flights go from Chicago to London Heathrow Airport every day.
Search flight deals

  • How far is Chicago to London Heathrow by plane?

    A flight from Chicago to London Heathrow will travel around 3933.5 mi. 7h 40m is a normal flight duration for this route.

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

    Prices for flights from Chicago to London Heathrow Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Chicago 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 Chicago to London Heathrow Airport?

  • What is the most popular airline from Chicago to London Heathrow Airport?

Best airlines flying from Chicago to London Heathrow Airport

Compare and see reviews for airlines that fly from Chicago to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom £357Free CancellationRating
6.8
7,344 reviews
Search Lufthansa flights
Aer LingusPriceFrom £410Free CancellationRating
7.1
1,228 reviews
Search Aer Lingus flights
FinnairPriceFrom £412Free CancellationRating
7.6
1,320 reviews
Search Finnair flights
IberiaPriceFrom £445Free CancellationRating
7.0
2,884 reviews
Search Iberia flights
British AirwaysPriceFrom £458Free CancellationRating
6.7
7,291 reviews
Search British Airways flights
United AirlinesPriceFrom £460Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights
American AirlinesPriceFrom £498Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

  • Finnair Flights From Chicago to London Heathrow Airport

    Finnair is one of the most popular airlines flying from Chicago to London Heathrow Airport, operating 34 flights/week on average for this route. A good Finnair flight deal for Chicago to London Heathrow Airport starts from £556 round-trip, up to an average price of £808. Our users have rated Finnair at 7.6/10.

  • United Airlines Flights From Chicago to London Heathrow Airport

    The best United Airlines deal for Chicago to London Heathrow Airport flight tickets found on momondo in the last 72 hours was £621, round-trip. It should be noted that an average United Airlines flight deal for this route in this time was higher, at £1,002 round-trip. United Airlines operates 16 flights out of Chicago into London Heathrow Airport in an average week, so prices vary by time and availability. 8,930 United Airlines reviews by users on momondo have scored the airline at 7.4/10.

Travelling to a place near London?

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

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to London. momondo saves you time and could save you money on your trip.

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

Flights from Chicago to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once all potential Chicago to London 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 Chicago to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Chicago to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your London Heathrow Airport trip

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