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Cheap flights from Chicago O'Hare Intl Airport to London from £284

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 18/3. 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

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
19:20 - 21:40
ORD
-
LHR
20h 20m1 stop
Scandinavian Airlines Logo
10:20 - 16:45
LHR
-
ORD
12h 25m1 stop
£413Scandinavian Airlines
Sat, 10 Jan - Mon, 12 Jan
Scandinavian Airlines Logo
19:20 - 16:00
ORD
-
LHR
14h 40m1 stop
Scandinavian Airlines Logo
10:20 - 16:45
LHR
-
ORD
12h 25m1 stop
£414Scandinavian Airlines
Fri, 13 Feb - Thu, 19 Feb
Scandinavian Airlines Logo
19:20 - 19:55
ORD
-
LHR
18h 35m2 stops
Scandinavian Airlines Logo
19:30 - 16:55
LHR
-
ORD
27h 25m1 stop
£414Scandinavian Airlines
Thu, 22 Jan - Thu, 29 Jan
Scandinavian Airlines Logo
19:20 - 16:00
ORD
-
LHR
14h 40m1 stop
Scandinavian Airlines Logo
19:50 - 16:45
LHR
-
ORD
26h 55m2 stops
£415Scandinavian Airlines
Fri, 9 Jan - Tue, 20 Jan
Scandinavian Airlines Logo
19:15 - 08:55
ORD
-
LHR
31h 40m2 stops
Scandinavian Airlines Logo
06:40 - 16:10
LHR
-
ORD
15h 30m1 stop
£416Scandinavian Airlines
Fri, 24 Apr - Mon, 27 Apr
Scandinavian Airlines Logo
19:20 - 16:25
ORD
-
LHR
15h 05m2 stops
Scandinavian Airlines Logo
07:05 - 16:45
LHR
-
ORD
15h 40m2 stops
£417Scandinavian Airlines
Thu, 15 Jan - Thu, 22 Jan
Icelandair Logo
18:30 - 10:50
ORD
-
LHR
10h 20m1 stop
Icelandair Logo
12:15 - 17:20
LHR
-
ORD
11h 05m1 stop
£417Icelandair
Tue, 30 Dec - Sat, 31 Jan
Scandinavian Airlines Logo
19:20 - 16:25
ORD
-
LHR
15h 05m2 stops
Scandinavian Airlines Logo
07:05 - 16:45
LHR
-
ORD
15h 40m2 stops
£418Scandinavian Airlines
Sat, 10 Jan - Mon, 12 Jan
Scandinavian Airlines Logo
19:15 - 08:55
ORD
-
LHR
31h 40m2 stops
Scandinavian Airlines Logo
07:05 - 16:10
LHR
-
ORD
15h 05m2 stops
£419Scandinavian Airlines
Fri, 24 Apr - Mon, 27 Apr
Scandinavian Airlines Logo
19:20 - 17:40
ORD
-
LHR
16h 20m1 stop
Scandinavian Airlines Logo
07:05 - 16:45
LHR
-
ORD
15h 40m2 stops
£420Scandinavian Airlines
Thu, 12 Feb - Mon, 16 Feb

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

Our best Scandinavian Airlines deals on Chicago O'Hare Intl Airport to London Heathrow Airport flight tickets
Scandinavian Airlines
10 Jan
ORD19:20Chicago O'Hare Intl
20h 20m
1 stop
LHR21:40London Heathrow
12 Jan
LHR10:20London Heathrow
12h 25m
1 stop
ORD16:45Chicago O'Hare Intl
£413
Find similar
Scandinavian Airlines
13 Feb
ORD19:20Chicago O'Hare Intl
14h 40m
1 stop
LHR16:00London Heathrow
19 Feb
LHR06:40London Heathrow
16h 05m
1 stop
ORD16:45Chicago O'Hare Intl
£414
Find similar
Scandinavian Airlines
22 Jan
ORD19:20Chicago O'Hare Intl
18h 35m
2 stops
LHR19:55London Heathrow
29 Jan
LHR19:30London Heathrow
27h 25m
1 stop
ORD16:55Chicago O'Hare Intl
£414
Find similar

TAP AIR PORTUGAL flights from Chicago O'Hare Intl Airport to London Heathrow Airport

Our best TAP AIR PORTUGAL deals on Chicago O'Hare Intl Airport to London Heathrow Airport flight tickets
TAP AIR PORTUGAL
16 Jan
ORD20:15Chicago O'Hare Intl
15h 15m
1 stop
LHR17:30London Heathrow
1 Feb
LHR06:00London Heathrow
14h 45m
1 stop
ORD14:45Chicago O'Hare Intl
£425
Find similar
TAP AIR PORTUGAL
11 Jan
ORD20:25Chicago O'Hare Intl
15h 05m
1 stop
LHR17:30London Heathrow
20 Jan
LHR18:30London Heathrow
26h 30m
1 stop
ORD15:00Chicago O'Hare Intl
£434
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 December 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

Sat 10/1

19:20-21:40

1 stop20h 20m

London Heathrow

Mon 12/1

10:20-16:45

1 stop12h 25m

£413

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 13/2

19:20-16:00

1 stop14h 40m

London Heathrow

Thu 19/2

10:20-16:45

1 stop12h 25m

£414

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 22/1

19:20-19:55

2 stops18h 35m

London Heathrow

Thu 29/1

19:30-16:55

1 stop27h 25m

£414

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 9/1

19:20-16:00

1 stop14h 40m

London Heathrow

Tue 20/1

19:50-16:45

2 stops26h 55m

£415

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 24/4

19:15-08:55

2 stops31h 40m

London Heathrow

Mon 27/4

06:40-16:10

1 stop15h 30m

£416

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 15/1

19:20-16:25

2 stops15h 05m

London Heathrow

Thu 22/1

07:05-16:45

2 stops15h 40m

£417

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/12

18:30-10:50

1 stop10h 20m

London Heathrow

Sat 31/1

12:15-17:20

1 stop11h 05m

£417

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 10/1

19:20-16:25

2 stops15h 05m

London Heathrow

Mon 12/1

07:05-16:45

2 stops15h 40m

£418

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 24/4

19:15-08:55

2 stops31h 40m

London Heathrow

Mon 27/4

07:05-16:10

2 stops15h 05m

£419

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 12/2

19:20-17:40

1 stop16h 20m

London Heathrow

Mon 16/2

07:05-16:45

2 stops15h 40m

£420

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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, April 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 £502. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Chicago O'Hare Intl Airport averaging around £506.

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 Sunday. momondo users have found tickets for Sunday departures for as low as £509. 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 £681.

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 O'Hare Intl Airport to London Heathrow Airport in the afternoon for as low as £565. 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 £576 on average. Flights to London Heathrow Airport from Chicago O'Hare Intl Airport at midday 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 £595 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 £524 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 5% 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 December 2025, prices for Chicago O'Hare Intl Airport to London Heathrow Airport flights are approximately 106% 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

£359

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 £359. The best return flight deal from Chicago O'Hare Intl Airport to London Heathrow Airport found on momondo in the last 72 hours is £564.
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 40m 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 £359Free CancellationRating
6.8
7,626 reviews
Search Lufthansa flights
American AirlinesPriceFrom £387Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights
FinnairPriceFrom £415Free CancellationRating
7.6
1,334 reviews
Search Finnair flights
British AirwaysPriceFrom £424Free CancellationRating
6.7
7,571 reviews
Search British Airways flights
IberiaPriceFrom £448Free CancellationRating
7.0
3,046 reviews
Search Iberia flights
Aer LingusPriceFrom £451Free CancellationRating
7.2
1,394 reviews
Search Aer Lingus flights
United AirlinesPriceFrom £463Free CancellationRating
7.4
9,096 reviews
Search United 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 28 times per week, with 1,334 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 £415 (round-trip), much lower than the average airfare cost of £678 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, 9,096 ratings). United Airlines flies from Chicago O'Hare Intl Airport to London Heathrow Airport around 21 times per week, with deals starting from £463 round-trip and rising to an average price of around £697.

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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.

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