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Cheap flights from Chicago to London from £169

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 12/10. 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

Air Canada Logo
10:00 - 07:10ORD-LHR
15h 10m2 stops
Air Canada Logo
09:00 - 18:51LHR-ORD
15h 51m2 stops
£372Air Canada
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Wed, 28 Jan - Fri, 6 Feb
United Airlines Logo
10:40 - 06:30ORD-LHR
13h 50m1 stop
United Airlines Logo
06:50 - 12:05LHR-ORD
11h 15m1 stop
£372United Airlines
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Tue, 30 Sep - Tue, 7 Oct
United Airlines Logo
16:00 - 06:20ORD-LHR
8h 20mdirect
United Airlines Logo
06:50 - 12:05LHR-ORD
11h 15m1 stop
£373United Airlines
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Tue, 30 Sep - Tue, 7 Oct
Finnair Logo
12:05 - 08:15ORD-LHR
14h 10m1 stop
Finnair Logo
07:30 - 17:50LHR-ORD
16h 20m1 stop
£374Finnair
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Sun, 1 Mar - Wed, 6 May
Air Canada Logo
12:50 - 07:10ORD-LHR
12h 20m1 stop
Air Canada Logo
19:25 - 17:48LHR-ORD
28h 23m2 stops
£375Air Canada
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Wed, 18 Feb - Mon, 23 Feb
Austrian Airlines Logo
16:20 - 14:20ORD-LHR
16h 00m1 stop
Austrian Airlines Logo
06:00 - 13:20LHR-ORD
13h 20m1 stop
£376Austrian Airlines
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Mon, 29 Sep - Thu, 16 Oct
Logo
15:35 - 09:35ORD-LHR
12h 00m1 stop
Logo
19:15 - 19:25LHR-ORD
29h 10m1 stop
£377
Find Deal
Wed, 22 Oct - Tue, 28 Oct
Logo
15:35 - 11:20ORD-LHR
14h 45m2 stops
Logo
06:50 - 14:55LHR-ORD
14h 05m2 stops
£377
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Tue, 28 Oct - Thu, 6 Nov
British Airways Logo
18:10 - 06:55ORD-LHR
7h 45mdirect
British Airways Logo
15:45 - 18:45LHR-ORD
9h 00mdirect
£381British Airways
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Tue, 28 Oct - Tue, 4 Nov
Austrian Airlines Logo
16:20 - 21:40ORD-LHR
23h 20m1 stop
Austrian Airlines Logo
07:40 - 11:00LHR-ORD
9h 20mdirect
£394Austrian Airlines
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Fri, 5 Dec - Sun, 7 Dec

Delta flights from Chicago to London Heathrow Airport

Our best Delta deals on Chicago to London Heathrow Airport flight tickets
Delta
6 Oct
ORD09:30Chicago O'Hare Intl
14h 55m
1 stop
LHR06:25London Heathrow
4 Nov
LHR09:00London Heathrow
12h 10m
1 stop
ORD15:10Chicago O'Hare Intl
£378
Find similar
Delta
28 Sept
ORD17:31Chicago O'Hare Intl
13h 59m
1 stop
LHR13:30London Heathrow
16 Oct
LHR08:40London Heathrow
11h 30m
1 stop
ORD14:10Chicago O'Hare Intl
£379
Find similar
Delta
29 Oct
MDW17:04Chicago Midway
10h 56m
1 stop
LHR09:00London Heathrow
5 Nov
LHR11:30London Heathrow
16h 44m
2 stops
MDW22:14Chicago Midway
£386
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KLM flights from Chicago to London Heathrow Airport

Our best KLM deals on Chicago to London Heathrow Airport flight tickets
KLM
8 Feb
MDW14:00Chicago Midway
11h 05m
1 stop
LHR07:05London Heathrow
20 Feb
LHR13:00London Heathrow
11h 34m
1 stop
MDW18:34Chicago Midway
£397
Find similar
KLM
22 Sept
MDW12:43Chicago Midway
12h 02m
1 stop
LHR06:45London Heathrow
30 Sept
LHR11:20London Heathrow
16h 16m
1 stop
MDW21:36Chicago Midway
£409
Find similar
KLM
18 Nov
MDW13:47Chicago Midway
11h 18m
1 stop
LHR07:05London Heathrow
2 Dec
LHR15:50London Heathrow
13h 42m
1 stop
MDW23:32Chicago Midway
£439
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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 16 September 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

Wed 28/1

10:00-07:10

2 stops15h 10m

London Heathrow

Fri 6/2

09:00-18:51

2 stops15h 51m

£372

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

10:40-06:30

1 stop13h 50m

London Heathrow

Tue 7/10

06:50-12:05

1 stop11h 15m

£372

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

16:00-06:20

Nonstop8h 20m

London Heathrow

Tue 7/10

06:50-12:05

1 stop11h 15m

£373

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 1/3

12:05-08:15

1 stop14h 10m

London Heathrow

Wed 6/5

07:30-17:50

1 stop16h 20m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 18/2

12:50-07:10

1 stop12h 20m

London Heathrow

Mon 23/2

19:25-17:48

2 stops28h 23m

£375

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 29/9

16:20-14:20

1 stop16h 00m

London Heathrow

Thu 16/10

06:00-13:20

1 stop13h 20m

£376

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/10

15:35-09:35

1 stop12h 00m

London Heathrow

Tue 28/10

19:15-19:25

1 stop29h 10m

£377

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 28/10

15:35-11:20

2 stops14h 45m

London Heathrow

Thu 6/11

06:50-14:55

2 stops14h 05m

£377

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 28/10

18:10-06:55

Nonstop7h 45m

London Heathrow

Tue 4/11

15:45-18:45

Nonstop9h 00m

£381

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 5/12

16:20-21:40

1 stop23h 20m

London Heathrow

Sun 7/12

07:40-11:00

Nonstop9h 20m

£394

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, November 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 £490. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Chicago averaging around £492.

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 £510. 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 £649.

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 £482. 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 at midday when prices are £567 on average. Flights to London Heathrow Airport from Chicago at midday 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 £584 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 £511 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 September 2025, prices for Chicago to London Heathrow Airport flights are approximately 1% more expensive 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

£275

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 £275. The best return flight deal from Chicago to London Heathrow Airport found on momondo in the last 72 hours is £440.
The fastest flight from Chicago to London Heathrow Airport takes 7h 40m
Direct flights go from Chicago to London Heathrow Airport every day.
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  • How far is Chicago to London Heathrow by plane?

    A flight from Chicago to London Heathrow will travel around 3933.5 mi. 7h 45m 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 £354Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights
American AirlinesPriceFrom £381Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
FinnairPriceFrom £409Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
IberiaPriceFrom £441Free CancellationRating
7.0
2,924 reviews
Search Iberia flights
Aer LingusPriceFrom £444Free CancellationRating
7.2
1,270 reviews
Search Aer Lingus flights
British AirwaysPriceFrom £454Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
United AirlinesPriceFrom £457Free CancellationRating
7.4
8,929 reviews
Search United 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 27 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 £874. 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 £934 round-trip. United Airlines operates 21 flights out of Chicago into London Heathrow Airport in an average week, so prices vary by time and availability. 8,929 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
Luton
Milton Keynes
Maidstone
Gatwick
Slough
Northampton
Swindon
Canterbury
Stratford-upon-Avon
Southend-on-Sea
Ipswich
Ilford
Guildford
Swanage
Poole
Colchester
Worthing
Salisbury
Chelmsford

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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