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Cheap flights from Chicago to London from £175

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 5/11. 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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Icelandair Logo
18:30 - 10:50ORD-LHR
10h 20m1 stop
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
£392Icelandair
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Mon, 29 Dec - Fri, 9 Jan
Icelandair Logo
18:30 - 10:50ORD-LHR
10h 20m1 stop
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
£392Icelandair
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Wed, 31 Dec - Thu, 15 Jan
Icelandair Logo
18:30 - 19:30ORD-LHR
19h 00m1 stop
Icelandair Logo
12:15 - 17:20LHR-ORD
11h 05m1 stop
£393Icelandair
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Wed, 31 Dec - Thu, 15 Jan
Scandinavian Airlines Logo
19:20 - 08:55ORD-LHR
31h 35m2 stops
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m1 stop
£394Scandinavian Airlines
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Sun, 16 Nov - Wed, 19 Nov
Scandinavian Airlines Logo
10:40 - 16:00ORD-LHR
23h 20m2 stops
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m1 stop
£395Scandinavian Airlines
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Thu, 29 Jan - Fri, 6 Feb
Scandinavian Airlines Logo
10:40 - 09:20ORD-LHR
16h 40m2 stops
Scandinavian Airlines Logo
06:40 - 16:45LHR-ORD
16h 05m1 stop
£395Scandinavian Airlines
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Thu, 26 Feb - Mon, 2 Mar
Aer Lingus Logo
16:50 - 09:05ORD-LHR
11h 15m1 stop
Aer Lingus Logo
07:50 - 14:00LHR-ORD
12h 10m1 stop
£410Aer Lingus
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Sun, 26 Oct - Tue, 4 Nov
Aer Lingus Logo
21:00 - 15:35ORD-LHR
12h 35m1 stop
Aer Lingus Logo
07:50 - 19:15LHR-ORD
17h 25m1 stop
£412Aer Lingus
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Wed, 28 Jan - Thu, 12 Feb
TAP AIR PORTUGAL Logo
20:25 - 17:30ORD-LHR
15h 05m1 stop
TAP AIR PORTUGAL Logo
18:30 - 14:45LHR-ORD
26h 15m1 stop
£413TAP AIR PORTUGAL
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Sun, 9 Nov - Sat, 15 Nov
Iberia Logo
21:45 - 10:25ORD-LHR
7h 40mdirect
Iberia Logo
19:40 - 14:30LHR-ORD
24h 50m1 stop
£427Iberia
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Sun, 26 Oct - Tue, 4 Nov

Aer Lingus flights from Chicago to London Heathrow Airport

Our best Aer Lingus deals on Chicago to London Heathrow Airport flight tickets
Aer Lingus
26 Oct
ORD16:50Chicago O'Hare Intl
11h 15m
1 stop
LHR09:05London Heathrow
4 Nov
LHR07:50London Heathrow
12h 10m
1 stop
ORD14:00Chicago O'Hare Intl
£410
Find similar
Aer Lingus
28 Jan
ORD21:00Chicago O'Hare Intl
12h 35m
1 stop
LHR15:35London Heathrow
12 Feb
LHR07:50London Heathrow
17h 25m
1 stop
ORD19:15Chicago O'Hare Intl
£412
Find similar
Aer Lingus
21 Oct
ORD15:45Chicago O'Hare Intl
11h 20m
1 stop
LHR09:05London Heathrow
19 Nov
LHR12:10London Heathrow
11h 45m
1 stop
ORD17:55Chicago O'Hare Intl
£412
Find similar

TAP AIR PORTUGAL flights from Chicago to London Heathrow Airport

Our best TAP AIR PORTUGAL deals on Chicago to London Heathrow Airport flight tickets
TAP AIR PORTUGAL
9 Nov
ORD20:25Chicago O'Hare Intl
15h 05m
1 stop
LHR17:30London Heathrow
15 Nov
LHR18:30London Heathrow
26h 15m
1 stop
ORD14:45Chicago O'Hare Intl
£413
Find similar
TAP AIR PORTUGAL
23 Oct
ORD18:00Chicago O'Hare Intl
22h 05m
1 stop
LHR22:05London Heathrow
12 Nov
LHR06:00London Heathrow
15h 00m
1 stop
ORD15:00Chicago O'Hare Intl
£427
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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 17 October 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

Mon 29/12

18:30-10:50

1 stop10h 20m

London Heathrow

Fri 9/1

12:15-17:20

1 stop11h 05m

£392

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 31/12

18:30-10:50

1 stop10h 20m

London Heathrow

Thu 15/1

12:15-17:20

1 stop11h 05m

£392

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 31/12

18:30-19:30

1 stop19h 00m

London Heathrow

Thu 15/1

12:15-17:20

1 stop11h 05m

£393

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 16/11

19:20-08:55

2 stops31h 35m

London Heathrow

Wed 19/11

06:40-16:45

1 stop16h 05m

£394

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 29/1

10:40-16:00

2 stops23h 20m

London Heathrow

Fri 6/2

06:40-16:45

1 stop16h 05m

£395

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 26/2

10:40-09:20

2 stops16h 40m

London Heathrow

Mon 2/3

06:40-16:45

1 stop16h 05m

£395

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 26/10

16:50-09:05

1 stop11h 15m

London Heathrow

Tue 4/11

07:50-14:00

1 stop12h 10m

£410

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 28/1

21:00-15:35

1 stop12h 35m

London Heathrow

Thu 12/2

07:50-19:15

1 stop17h 25m

£412

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 9/11

20:25-17:30

1 stop15h 05m

London Heathrow

Sat 15/11

18:30-14:45

1 stop26h 15m

£413

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 26/10

21:45-10:25

Nonstop7h 40m

London Heathrow

Tue 4/11

19:40-14:30

1 stop24h 50m

£427

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

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 typical price of a round-trip flight between Chicago and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

In general, January 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 £500. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Chicago averaging around £500.

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 £514. 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 £661.

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 afternoon. momondo users have found flights departing from Chicago to London Heathrow Airport in the afternoon for as low as £563. 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 £574 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 £593 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 £518 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 October 2025, prices for Chicago to London Heathrow Airport flights are approximately 49% 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

£293

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 £293. The best return flight deal from Chicago to London Heathrow Airport found on momondo in the last 72 hours is £423.
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 £358Free CancellationRating
6.8
7,497 reviews
Search Lufthansa flights
American AirlinesPriceFrom £385Free CancellationRating
7.2
11,039 reviews
Search American Airlines flights
FinnairPriceFrom £414Free CancellationRating
7.6
1,332 reviews
Search Finnair flights
IberiaPriceFrom £446Free CancellationRating
7.0
2,994 reviews
Search Iberia flights
British AirwaysPriceFrom £450Free CancellationRating
6.7
7,457 reviews
Search British Airways flights
United AirlinesPriceFrom £462Free CancellationRating
7.4
8,982 reviews
Search United Airlines flights
Aer LingusPriceFrom £493Free CancellationRating
7.2
1,341 reviews
Search Aer Lingus 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 28 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 £904. 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 £828 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. 8,982 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
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Southend-on-Sea
Ipswich
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Poole
Swanage
Colchester
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Hayes
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.

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