Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Chicago O'Hare Intl Airport to London from £171

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 O'Hare Intl Airport to London departing on 12/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Chicago O'Hare Intl Airport to London

Cheap return flights

Logo
10:40 - 06:30ORD-LHR
13h 50m1 stop
Logo
09:00 - 18:39LHR-ORD
15h 39m2 stops
£373
Find Deal
Sun, 19 Oct - Tue, 4 Nov
United Airlines Logo
21:50 - 11:45ORD-LHR
7h 55mdirect
United Airlines Logo
06:50 - 12:05LHR-ORD
11h 15m1 stop
£374United Airlines
Find Deal
Wed, 24 Sep - Tue, 14 Oct
United Airlines Logo
21:25 - 11:45ORD-LHR
8h 20mdirect
United Airlines Logo
06:50 - 12:05LHR-ORD
11h 15m1 stop
£374United Airlines
Find Deal
Tue, 30 Sep - Tue, 7 Oct
Air Canada Logo
18:20 - 11:50ORD-LHR
11h 30m1 stop
Air Canada Logo
09:30 - 18:54LHR-ORD
15h 24m2 stops
£376Air Canada
Find Deal
Sun, 21 Sep - Tue, 30 Sep
British Airways Logo
16:55 - 06:50ORD-LHR
7h 55mdirect
British Airways Logo
09:15 - 11:50LHR-ORD
8h 35mdirect
£378British Airways
Find Deal
Mon, 22 Sep - Tue, 21 Oct
Air Canada Logo
15:50 - 11:50ORD-LHR
14h 00m1 stop
Air Canada Logo
09:30 - 18:54LHR-ORD
15h 24m2 stops
£383Air Canada
Find Deal
Sun, 21 Sep - Tue, 30 Sep
Lufthansa Logo
16:00 - 06:20ORD-LHR
8h 20mdirect
Lufthansa Logo
08:30 - 11:30LHR-ORD
9h 00mdirect
£389Lufthansa
Find Deal
Thu, 16 Oct - Wed, 22 Oct
Lufthansa Logo
21:25 - 11:45ORD-LHR
8h 20mdirect
Lufthansa Logo
14:10 - 17:20LHR-ORD
9h 10mdirect
£390Lufthansa
Find Deal
Mon, 29 Sep - Tue, 7 Oct
British Airways Logo
21:45 - 11:35ORD-LHR
7h 50mdirect
British Airways Logo
15:30 - 18:15LHR-ORD
8h 45mdirect
£394British Airways
Find Deal
Tue, 30 Dec - Tue, 12 May
Iberia Logo
15:21 - 07:50ORD-LHR
10h 29m1 stop
Iberia Logo
09:15 - 11:50LHR-ORD
8h 35mdirect
£400Iberia
Find Deal
Tue, 23 Sep - Thu, 23 Oct

United Airlines flights from Chicago O'Hare Intl Airport to London Heathrow Airport

Our best United Airlines deals on Chicago O'Hare Intl Airport to London Heathrow Airport flight tickets
United Airlines
24 Sept
ORD21:50Chicago O'Hare Intl
7h 55m
LHR11:45London Heathrow
14 Oct
LHR06:50London Heathrow
11h 15m
1 stop
ORD12:05Chicago O'Hare Intl
£374
Find similar
United Airlines
30 Sept
ORD21:25Chicago O'Hare Intl
8h 20m
LHR11:45London Heathrow
7 Oct
LHR06:50London Heathrow
11h 15m
1 stop
ORD12:05Chicago O'Hare Intl
£374
Find similar
United Airlines
18 Sept
ORD21:31Chicago O'Hare Intl
27h 24m
1 stop
LHR06:55London Heathrow
21 Sept
LHR06:50London Heathrow
11h 15m
1 stop
ORD12:05Chicago O'Hare Intl
£376
Find similar

Delta flights from Chicago O'Hare Intl Airport to London Heathrow Airport

Our best Delta deals on Chicago O'Hare Intl Airport to London Heathrow Airport flight tickets
Delta
30 Sept
ORD13:00Chicago O'Hare Intl
11h 25m
1 stop
LHR06:25London Heathrow
14 Nov
LHR06:20London Heathrow
14h 50m
1 stop
ORD15:10Chicago O'Hare Intl
£379
Find similar
Delta
24 Sept
ORD14:05Chicago O'Hare Intl
12h 00m
1 stop
LHR08:05London Heathrow
24 Oct
LHR08:40London Heathrow
11h 30m
1 stop
ORD14:10Chicago O'Hare Intl
£380
Find similar
Delta
1 Oct
ORD18:28Chicago O'Hare Intl
11h 37m
1 stop
LHR12:05London Heathrow
8 Oct
LHR06:15London Heathrow
15h 56m
2 stops
ORD16:11Chicago O'Hare Intl
£387
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Chicago O'Hare Intl Airport 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 12 September 2025.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport 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

Sun 19/10

10:40-06:30

1 stop13h 50m

London Heathrow

Tue 4/11

09:00-18:39

2 stops15h 39m

£373

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 24/9

21:50-11:45

Nonstop7h 55m

London Heathrow

Tue 14/10

06:50-12:05

1 stop11h 15m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

21:25-11:45

Nonstop8h 20m

London Heathrow

Tue 7/10

06:50-12:05

1 stop11h 15m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 21/9

18:20-11:50

1 stop11h 30m

London Heathrow

Tue 30/9

09:30-18:54

2 stops15h 24m

£376

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 22/9

16:55-06:50

Nonstop7h 55m

London Heathrow

Tue 21/10

09:15-11:50

Nonstop8h 35m

£378

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 21/9

15:50-11:50

1 stop14h 00m

London Heathrow

Tue 30/9

09:30-18:54

2 stops15h 24m

£383

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 16/10

16:00-06:20

Nonstop8h 20m

London Heathrow

Wed 22/10

08:30-11:30

Nonstop9h 00m

£389

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 29/9

21:25-11:45

Nonstop8h 20m

London Heathrow

Tue 7/10

14:10-17:20

Nonstop9h 10m

£390

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/12

21:45-11:35

Nonstop7h 50m

London Heathrow

Tue 12/5

15:30-18:15

Nonstop8h 45m

£394

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 23/9

15:21-07:50

1 stop10h 29m

London Heathrow

Thu 23/10

09:15-11:50

Nonstop8h 35m

£400

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to London from

How to get the cheapest flight ticket from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport and London Heathrow Airport?

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

In general, February is the cheapest month to fly from Chicago O'Hare Intl Airport to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £496. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl Airport 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 £663.

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 O'Hare Intl Airport to London Heathrow Airport in the morning for as low as £466. 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 £570 on average. Flights to London Heathrow Airport from Chicago O'Hare Intl Airport in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Chicago O'Hare Intl to London Heathrow flight route?

Fly from Chicago O'Hare Intl to London Heathrow for the best Chicago O'Hare Intl - 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 O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £585 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 O'Hare Intl Airport for as low as £514 on momondo.

What cabin class options are available on Chicago O'Hare Intl to London Heathrow flights?

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

You could potentially save up to 14% on your flight if you consider stops on a Chicago O'Hare Intl Airport to London Heathrow Airport flight.

How have Chicago O'Hare Intl Airport to London Heathrow Airport flight prices changed over time?

As of September 2025, prices for Chicago O'Hare Intl Airport to London Heathrow Airport flights are approximately 4% more expensive when compared to flights at the same time last year.

When to book flights from Chicago O'Hare Intl Airport to London Heathrow Airport

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

Cheap Chicago O'Hare Intl Airport to London Heathrow Airport (ORD to LHR) flight deals and tips

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

Best price found

£276

Fastest flight time

7h 40m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Chicago O'Hare Intl Airport in the past 72 hours is £276. The best return flight deal from Chicago O'Hare Intl Airport to London Heathrow Airport found on momondo in the last 72 hours is £361.
The fastest flight from Chicago O'Hare Intl Airport to London Heathrow Airport takes 7h 40m
Direct flights go from Chicago O'Hare Intl Airport to London Heathrow Airport every day.
Search flight deals

  • How far is Chicago O'Hare Intl to London Heathrow by plane?

    The distance between Chicago O'Hare Intl and London Heathrow is about 3939.2 mi. Typically, this will take 7h 50m by plane in normal conditions.

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

    Prices for flights from Chicago O'Hare Intl Airport to London Heathrow Airport were last updated today.

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

  • How old do you have to be to fly from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to London Heathrow Airport.

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

    The travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Chicago O'Hare Intl Airport to London Heathrow Airport?

  • What is the most popular airline from Chicago O'Hare Intl Airport to London Heathrow Airport?

Best airlines flying from Chicago O'Hare Intl Airport to London Heathrow Airport

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom £355Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
FinnairPriceFrom £410Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
IberiaPriceFrom £442Free CancellationRating
7.0
2,929 reviews
Search Iberia flights
Aer LingusPriceFrom £445Free CancellationRating
7.2
1,271 reviews
Search Aer Lingus flights
British AirwaysPriceFrom £455Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
United AirlinesPriceFrom £458Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
American AirlinesPriceFrom £495Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

  • Finnair Flights From Chicago O'Hare Intl Airport to London Heathrow Airport

    Finnair flies from Chicago O'Hare Intl Airport to London Heathrow Airport around 34 times per week, with 1,323 momondo users rating the airline 7.6/10. The cheapest Finnair deal from Chicago O'Hare Intl Airport to London Heathrow Airport in the last 72 hours was £556 (round-trip), much lower than the average airfare cost of £874 for Finnair flights on this route.

  • United Airlines Flights From Chicago O'Hare Intl Airport to London Heathrow Airport

    Another popular option for Chicago O'Hare Intl Airport to London Heathrow Airport flights is United Airlines (7.4/10, 8,937 ratings). United Airlines flies from Chicago O'Hare Intl Airport to London Heathrow Airport around 21 times per week, with deals starting from £621 round-trip and rising to an average price of around £934.

Travelling to a place near London?

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

Why use momondo?

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

It is quick and easy to find Chicago to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

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

Yes. All flights to London from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo helps you find the best flight between Chicago and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Of course. momondo tracks the price of Chicago to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 12/10
Sun 19/10
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London