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Cheap flights from Chicago O'Hare Intl Airport to London Heathrow Airport from C$ 542

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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Chicago O'Hare Intl to London Heathrow are usually found in April or February, booked 42 days in advance, depart on a Monday or Friday and return on a Saturday

Cheap flight deals from O'Hare Intl to Heathrow

Enter your travel dates to find the best prices.

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 12 December 2025.

Wed 31/129:05 p.m.ORD - LHR
Nonstop8h 10mUnited Airlines
Wed 14/16:50 a.m.LHR - ORD
1 stop11h 20mUnited Airlines
Deal found 10/12C$ 844
Wed 10/125:50 p.m.ORD - LHR
Nonstop8h 05mUnited Airlines
Fri 20/36:50 a.m.LHR - ORD
1 stop11h 20mUnited Airlines
Deal found 10/12C$ 847
Tue 30/129:23 p.m.ORD - LHR
1 stop28h 07mUnited Airlines
Fri 9/11:25 p.m.LHR - ORD
1 stop27h 41mUnited Airlines
Deal found 10/12C$ 877
Wed 10/125:50 p.m.ORD - LHR
Nonstop8h 05mUnited Airlines
Fri 19/127:25 a.m.LHR - ORD
Nonstop9h 20mUnited Airlines
Deal found 10/12C$ 887
Wed 10/127:10 a.m.ORD - LHR
1 stop18h 40mDelta
Fri 19/1211:05 a.m.LHR - ORD
1 stop16h 35mDelta
Deal found 10/12C$ 907
Tue 30/125:50 p.m.ORD - LHR
Nonstop8h 05mUnited Airlines
Sat 31/11:45 p.m.LHR - ORD
1 stop32h 35mUnited Airlines
Deal found 10/12C$ 913
Thu 11/125:50 p.m.ORD - LHR
Nonstop8h 05mUnited Airlines
Tue 20/111:10 a.m.LHR - ORD
1 stop13h 15mUnited Airlines
Deal found 11/12C$ 916

Find 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 12 December 2025.

Round-trip from

C$ 768

One-way from

C$ 542

Popular in

June

Cheapest in

April

Average price

C$ 1,331

Good round-trip deal

C$ 874 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 10/3-10/4
  • 3 total stops
  • 33h 10m total
  • Chicago to London
Search Deals
JetBlue
  • JetBlue
  • 14/5
  • 1 total stop
  • 15h 00m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (C$ 378 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (C$ 79 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Chicago O'Hare Intl to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customize 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 629,999 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

O'Hare Intl

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 6/3

7:10 p.m.-9:35 a.m.

2 stops32h 25m

London Heathrow

Fri 13/3

10:20 a.m.-5:55 p.m.

1 stop12h 35m

C$ 807

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 6/3

7:00 a.m.-9:20 a.m.

2 stops20h 20m

London Heathrow

Sun 15/3

9:05 p.m.-5:45 p.m.

2 stops25h 40m

C$ 838

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 26/1

9:05 p.m.-11:15 a.m.

Nonstop8h 10m

London Heathrow

Tue 10/2

1:45 p.m.-4:20 p.m.

1 stop32h 35m

C$ 855

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 11/1

5:50 p.m.-7:55 a.m.

Nonstop8h 05m

London Heathrow

Wed 11/2

6:50 a.m.-12:10 p.m.

1 stop11h 20m

C$ 855

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 17/2

5:50 p.m.-7:55 a.m.

Nonstop8h 05m

London Heathrow

Wed 25/2

8:30 a.m.-3:20 p.m.

1 stop12h 50m

C$ 870

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 11/1

3:44 p.m.-8:25 a.m.

1 stop10h 41m

London Heathrow

Tue 20/1

8:30 a.m.-3:20 p.m.

1 stop12h 50m

C$ 870

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 6/1

3:45 p.m.-5:55 a.m.

Nonstop8h 10m

London Heathrow

Tue 13/1

8:30 a.m.-3:20 p.m.

1 stop12h 50m

C$ 870

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 13/4

8:30 p.m.-10:30 a.m.

Nonstop8h 00m

London Heathrow

Wed 22/4

10:20 a.m.-5:50 p.m.

1 stop13h 30m

C$ 876

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 31/3

10:35 p.m.-12:15 p.m.

Nonstop7h 40m

London Heathrow

Wed 8/4

7:30 a.m.-5:50 p.m.

1 stop16h 20m

C$ 876

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 10/3

4:45 p.m.-5:55 a.m.

Nonstop8h 10m

London Heathrow

Fri 10/4

9:30 a.m.-7:55 p.m.

1 stop16h 25m

C$ 892

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 22 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 round-trip 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 round-trip flight from O'Hare Intl to Heathrow. Price data was last updated on 5 December 2025.

Booking 42 days in advance of your planned departure date is, on average, the best time to get cheap flights from Chicago O'Hare Intl Airport to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, May is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport (average of C$ 545). Flying from Chicago O'Hare Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,252). 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 12 December 2025.

When flying from Chicago O'Hare Intl Airport to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Chicago O'Hare Intl Airport to London Heathrow Airport?

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 12 December 2025.
Read through reviews of airlines operating flights from Chicago O'Hare Intl Airport to London Heathrow Airport, such as British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,571 reviews
Check prices

Entertainment

6.4

Food

6.4

Boarding

6.9

Comfort

6.7

Crew

7.6

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.
British Airways
6.7
Okay
7,571 reviews
British Airways
6.7
Okay
7,571 reviews
Check prices

Entertainment

6.4

Food

6.4

Boarding

6.9

Comfort

6.7

Crew

7.6

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

IAD - LHR

The plane had to load and unload passengers not through a jet way but out on the tarmac at Heathrow. The steps were steep. We weren't expecting to have to carry our luggage up and down stairs.

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?

    For as low as C$ 855, Scandinavian Airlines can have you in London Heathrow Airport from Chicago O'Hare Intl Airport in 8h 10m. The distance from Chicago O'Hare Intl Airport to London Heathrow Airport is about 6339 km. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Chicago O'Hare Intl Airport to London Heathrow Airport round-trip?

    Currently priced at C$ 665, British Airways will fly you from Chicago O'Hare Intl Airport to London Heathrow Airport and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. British Airways is priced at 39% lower than the current average price of a flight leaving 3 months from now.

  • 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 (64%), Austrian Airlines (64%) and United Airlines (64%).

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

    Looking for the cheapest flight from Chicago O'Hare Intl Airport to London Heathrow Airport? While on average our users pay C$ 874, our data indicates the cheapest price to be C$ 870. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around C$ 827.

  • 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 vacation 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, May is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport (average of C$ 545). Flying from Chicago O'Hare Intl Airport to London Heathrow Airport in June is currently the most expensive (average of C$ 1,252). 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
Sutton
Twickenham
Slough
Marlow
Milton Keynes
Leamington Spa
Romford
Watford
Bedford
Luton
Stratford-upon-Avon
Gatwick
Hounslow

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from O'Hare Intl to Heathrow

Discover the top airline 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 629,999 searches. Data last updated 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapestC$ 665AverageC$ 757FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Deals for O'Hare Intl to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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?

Certainly. Search results for flights to Heathrow from O'Hare Intl shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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