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Cheap flights from Chicago O'Hare Intl Airport to London Heathrow Airport from £170

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 25/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
27 Aug — 3 Sep1
1 adult

Cheapflights Tip: The best prices from Chicago O'Hare Intl to London Heathrow are usually found in February or April, booked 55 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

Cheap flight deals from O'Hare Intl to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from O'Hare Intl (ORD) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 22 August 2025.

Round-trip from

£374

One-way from

£170

Popular in

June

Cheapest in

February

Average price

£522

Good round-trip deal

£374 or less

Good one-way deal

£311 or less
Icelandair
  • Icelandair
  • 19/9-30/9
  • 2 total stops
  • 40h 20m total
  • Chicago to London
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TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 25/9
  • 1 total stop
  • 22h 05m total
  • Chicago to London
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Highest demand for flights based on searches. 20% potential increase in price (£110 potential increase over avg. return price).
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Cheapest flight prices on average. 5% potential price decrease (£23 potential savings vs. average return price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Chicago O'Hare Intl to London Heathrow.
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Price to beat on a one-way flight from Chicago O'Hare Intl to London Heathrow.
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Find flight deals from O'Hare Intl to Heathrow

Cheapest flights from O'Hare Intl to Heathrow
Explore the most affordable flight options available from O'Hare Intl to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2025.

Fri 19/919:25ORD - LHR
1 stop10h 30mIcelandair
Tue 30/921:25LHR - ORD
1 stop29h 50mIcelandair
Deal found 20/8£374
Sun 28/919:25ORD - LHR
1 stop18h 55mIcelandair
Sun 12/1021:25LHR - ORD
1 stop26h 50mIcelandair
Deal found 21/8£375
Mon 22/919:25ORD - LHR
1 stop10h 30mIcelandair
Tue 30/921:25LHR - ORD
1 stop29h 50mIcelandair
Deal found 21/8£376
Mon 22/919:25ORD - LHR
1 stop10h 30mIcelandair
Sun 5/1021:25LHR - ORD
1 stop26h 50mIcelandair
Deal found 20/8£376
Tue 21/1019:15ORD - LHR
1 stop17h 15mScandinavian Airlines
Wed 29/1006:40LHR - ORD
1 stop19h 25mScandinavian Airlines
Deal found 19/8£377
Mon 20/1019:15ORD - LHR
1 stop32h 05mScandinavian Airlines
Mon 27/1018:05LHR - ORD
2 stops56h 00mScandinavian Airlines
Deal found 20/8£378
Mon 1/922:15ORD - LHR
1 stop16h 05mIcelandair
Wed 17/913:05LHR - ORD
1 stop14h 10mIcelandair
Deal found 21/8£379
Wed 3/922:15ORD - LHR
1 stop31h 40mIcelandair
Mon 8/921:25LHR - ORD
1 stop26h 50mIcelandair
Deal found 21/8£379
Thu 4/919:25ORD - LHR
1 stop10h 30mIcelandair
Tue 9/921:25LHR - ORD
1 stop29h 50mIcelandair
Deal found 21/8£380
Thu 11/919:25ORD - LHR
1 stop18h 55mIcelandair
Tue 16/921:25LHR - ORD
1 stop29h 50mIcelandair
Deal found 21/8£381
Tue 9/919:25ORD - LHR
1 stop10h 30mIcelandair
Wed 17/913:05LHR - ORD
1 stop11h 10mIcelandair
Deal found 21/8£382
Sun 7/920:40ORD - LHR
Nonstop7h 50mBritish Airways
Tue 16/911:05LHR - ORD
Nonstop8h 45mBritish Airways
Deal found 21/8£382

Cheapflights Fare Finder

 
Customise your flight search to find flights from O'Hare Intl to Heathrow 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, Cheapflights users made 858,174 searches. Data last updated 22 August 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

O'Hare Intl

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 7/9

13:25-07:15

1 stop11h 50m

London Heathrow

Tue 16/9

09:00-15:00

1 stop12h 00m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 2/9

10:15-06:45

1 stop14h 30m

London Heathrow

Fri 12/9

06:15-15:00

1 stop14h 45m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 8/9

13:30-06:45

1 stop11h 15m

London Heathrow

Thu 18/9

09:00-15:00

1 stop12h 00m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

14:05-06:45

1 stop10h 40m

London Heathrow

Fri 17/10

08:40-14:10

1 stop11h 30m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 5/10

18:28-12:35

1 stop12h 07m

London Heathrow

Wed 29/10

09:00-16:10

1 stop12h 10m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 18/11

15:35-09:00

1 stop11h 25m

London Heathrow

Tue 16/12

08:55-15:10

1 stop12h 15m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 27/10

18:21-10:15

1 stop10h 54m

London Heathrow

Fri 21/11

08:55-15:10

1 stop12h 15m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 19/10

19:59-13:30

1 stop11h 31m

London Heathrow

Wed 29/10

06:20-16:10

1 stop14h 50m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 29/10

15:50-07:50

1 stop11h 00m

London Heathrow

Wed 19/11

08:55-15:10

1 stop12h 15m

£388

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 7/9

14:25-09:50

1 stop13h 25m

London Heathrow

Fri 19/9

09:00-15:00

1 stop12h 00m

£388

Flights are sorted by cheapest return flights first.

Deals found on 21/8

Showing 1-10 of 24 results
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Best time to book a flight from O'Hare Intl to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from O'Hare Intl with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Chicago O'Hare Intl Airport to London Heathrow Airport

How far ahead should I book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport?

Use this chart to determine the optimal time to book a return flight from O'Hare Intl to Heathrow. Price data was last updated on 8 August 2025.

The best time to book flights from Chicago O'Hare Intl Airport to London Heathrow Airport is 55 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport (average of £112). Flying from Chicago O'Hare Intl Airport to London Heathrow Airport in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ORD to LHR?

Find hourly flight availability from O'Hare Intl to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 22 August 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 28% on flights from Chicago O'Hare Intl Airport to London Heathrow Airport by exploring options for tickets in the morning.

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 22 August 2025.
Read through reviews of airlines operating flights from Chicago O'Hare Intl Airport to London Heathrow Airport, such as Finnair, Aer Lingus, andIberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Crew

8.1

Comfort

7.5

Entertainment

6.9

Boarding

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,320 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Crew

8.1

Comfort

7.5

Entertainment

6.9

Boarding

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Aer Lingus
7.1
Good
1,228 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Crew

8.1

Comfort

7.5

Entertainment

6.9

Boarding

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Iberia
7.0
Good
2,884 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Crew

8.1

Comfort

7.5

Entertainment

6.9

Boarding

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Lufthansa
6.8
Okay
7,350 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Crew

8.1

Comfort

7.5

Entertainment

6.9

Boarding

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
British Airways
6.7
Okay
7,292 reviews
Finnair
7.6
Good
1,320 reviews
Check prices

Overall

7.6

Crew

8.1

Comfort

7.5

Entertainment

6.9

Boarding

7.6

Food

6.7

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Chicago O'Hare Intl Airport to London Heathrow Airport?

    Departing from Chicago O'Hare Intl Airport to London Heathrow Airport will take you 11h 50m. Chicago O'Hare Intl Airport and London Heathrow Airport are separated by a distance of 3939 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Chicago O'Hare Intl Airport to London Heathrow Airport round-trip?

    Currently priced at £358, Lufthansa will fly you from Chicago O'Hare Intl Airport to London Heathrow Airport and back. In addition to Lufthansa, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Aer Lingus and Finnair - these airlines can fly you to your destination from £411 and £414, respectively. Lufthansa is currently priced 39% below the average price you’ll pay for this route.

  • What are the most reliable airlines from Chicago O'Hare Intl Airport to London Heathrow Airport?

    The top 3 most reliable airlines when flying from Chicago O'Hare Intl Airport to London Heathrow Airport are Air Canada (63%), Austrian Airlines (63%) and United Airlines (63%).

  • What are the cheapest flights from Chicago O'Hare Intl Airport to London Heathrow Airport?

    The cheapest flight price from Chicago O'Hare Intl Airport to London Heathrow Airport is £282. On average you can expect to pay £1,538. The most popular route, (Chicago O'Hare Intl - London Heathrow), can usually be booked for £276.

  • Can I find deals for flights from O'Hare Intl to Heathrow that include hotel bookings?

    Yes. In addition to deals on O'Hare Intl to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from O'Hare Intl to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from O'Hare Intl to Heathrow.

  • Can I find deals for business class flights from O'Hare Intl to Heathrow?

    Yes. Cheapflights offers flight deals from O'Hare Intl to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport?

    Currently, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport (average of £112). Flying from Chicago O'Hare Intl Airport to London Heathrow Airport in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Croydon
Hounslow
Gatwick
Slough
Northampton
Deal
Luton
Wembley
Ilford
Crawley
Hayes
Watford
Folkestone
Ipswich
Winchester
Swindon
Eastbourne
Chichester
Southend-on-Sea

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for O'Hare Intl to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Gatwick flights
O'Hare Intl to London City flights
Midway to Heathrow flights
O'Hare Intl to Stansted flights
O'Hare Intl to Luton flights

Top 7 airlines flying from O'Hare Intl to Heathrow

Discover the top 7 airlines that operate flights from O'Hare Intl to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 22 August 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£358Average£578FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Aer LingusCheapest£411Average£579FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
FinnairCheapest£414Average£601FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£446Average£565FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£459Average£626FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£462Average£746FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest£499Average£628FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from O'Hare Intl to Heathrow?

Cheapflights helps you search for flights from O'Hare Intl to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from O'Hare Intl to Heathrow?

Cheapflights simply makes it quick and affordable to book flights from O'Hare Intl to Heathrow by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from O'Hare Intl to Heathrow with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from O'Hare Intl to Heathrow flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from O'Hare Intl to Heathrow become cheaper?

Of course! You can now track prices for flights from O'Hare Intl to Heathrow and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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