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Cheap flights from Chicago O'Hare Intl Airport to London Heathrow Airport from C$ 378

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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Chicago O'Hare Intl to London Heathrow are usually found in February or April, booked 28 days in advance, depart on a Monday or Wednesday and return on a Saturday

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 11 September 2025.

Round-trip from

C$ 700

One-way from

C$ 378

Popular in

June

Cheapest in

February

Average price

C$ 1,002

Good round-trip deal

C$ 1,032 or less
United Airlines
  • United Airlines
  • 30/11-8/12
  • 2 total stops
  • 62h 30m total
  • Chicago to London
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8/10
  • 8/10
  • 3 total stops
  • 29h 42m total
  • Chicago to London
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Highest demand for flights based on searches. 20% potential increase in price (C$ 386 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease (C$ 80 potential savings vs. average RT price).
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Average for round-trip flights in September 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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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 11 September 2025.

Sun 30/118:15 p.m.ORD - LHR
1 stop28h 15mUnited Airlines
Mon 8/1212:05 p.m.LHR - ORD
1 stop34h 15mUnited Airlines
Deal found 10/9C$ 700
Wed 24/99:50 p.m.ORD - LHR
Nonstop7h 55mUnited Airlines
Tue 14/106:50 a.m.LHR - ORD
1 stop11h 15mUnited Airlines
Deal found 10/9C$ 701
Tue 30/99:25 p.m.ORD - LHR
Nonstop8h 20mUnited Airlines
Tue 7/106:50 a.m.LHR - ORD
1 stop11h 15mUnited Airlines
Deal found 11/9C$ 703
Thu 4/127:20 p.m.ORD - LHR
2 stops59h 35mScandinavian Airlines
Mon 8/126:40 a.m.LHR - ORD
1 stop16h 05mScandinavian Airlines
Deal found 10/9C$ 704
Thu 18/99:31 p.m.ORD - LHR
1 stop27h 24mUnited Airlines
Sun 21/96:50 a.m.LHR - ORD
1 stop11h 15mUnited Airlines
Deal found 10/9C$ 705
Sat 1/118:18 p.m.ORD - LHR
1 stop32h 22mUnited Airlines
Tue 25/111:25 p.m.LHR - ORD
1 stop27h 53mUnited Airlines
Deal found 10/9C$ 707
Wed 24/91:12 p.m.ORD - LHR
1 stop10h 43mUnited Airlines
Tue 7/106:50 a.m.LHR - ORD
1 stop11h 15mUnited Airlines
Deal found 11/9C$ 708
Fri 31/107:50 p.m.ORD - LHR
1 stop12h 10mUnited Airlines
Sun 2/117:40 a.m.LHR - ORD
Nonstop9h 20mUnited Airlines
Deal found 10/9C$ 710
Sun 28/96:20 p.m.ORD - LHR
1 stop11h 30mUnited Airlines
Tue 7/106:50 a.m.LHR - ORD
1 stop11h 15mUnited Airlines
Deal found 11/9C$ 711
Tue 30/91:00 p.m.ORD - LHR
1 stop11h 25mDelta
Fri 14/116:20 a.m.LHR - ORD
1 stop14h 50mDelta
Deal found 11/9C$ 712
Wed 24/91:00 p.m.ORD - LHR
1 stop11h 25mDelta
Fri 3/106:30 a.m.LHR - ORD
1 stop13h 40mDelta
Deal found 11/9C$ 714
Sun 21/910:40 a.m.ORD - LHR
1 stop13h 50mUnited Airlines
Tue 30/98:30 a.m.LHR - ORD
Nonstop9h 00mUnited Airlines
Deal found 11/9C$ 715

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 11 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

O'Hare Intl

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 12/11

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

Nonstop8h 05m

London Heathrow

Wed 19/11

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

1 stop11h 20m

C$ 701

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 28/9

4:00 p.m.-6:20 a.m.

Nonstop8h 20m

London Heathrow

Tue 7/10

6:50 a.m.-12:05 p.m.

1 stop11h 15m

C$ 703

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 29/9

4:00 p.m.-6:20 a.m.

Nonstop8h 20m

London Heathrow

Tue 7/10

6:50 a.m.-12:05 p.m.

1 stop11h 15m

C$ 703

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/10

10:40 a.m.-6:30 a.m.

1 stop13h 50m

London Heathrow

Wed 29/10

6:50 a.m.-1:10 p.m.

1 stop11h 20m

C$ 703

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 1/11

8:18 p.m.-9:40 a.m.

1 stop32h 22m

London Heathrow

Mon 10/11

12:05 p.m.-4:20 p.m.

1 stop34h 15m

C$ 712

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 21/9

6:00 p.m.-8:20 a.m.

Nonstop8h 20m

London Heathrow

Tue 30/9

2:05 p.m.-8:01 a.m.

1 stop23h 56m

C$ 715

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 21/9

4:00 p.m.-6:20 a.m.

Nonstop8h 20m

London Heathrow

Tue 30/9

9:30 a.m.-2:55 p.m.

1 stop11h 25m

C$ 716

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 29/9

10:50 a.m.-6:30 a.m.

1 stop13h 40m

London Heathrow

Mon 6/10

5:50 p.m.-12:05 p.m.

1 stop24h 15m

C$ 721

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 9/12

11:30 a.m.-6:55 a.m.

1 stop13h 25m

C$ 449

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 15/2

12:10 p.m.-6:55 a.m.

1 stop12h 45m

C$ 449

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/9

Showing 1-10 of 19 results
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2

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 29 August 2025.

Booking 28 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, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport (average of C$ 560). Flying from Chicago O'Hare Intl Airport to London Heathrow Airport in July is currently the most expensive (average of C$ 856). 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 11 September 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 11 September 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
7,361 reviews
Check prices

Food

6.3

Crew

7.6

Boarding

6.9

Overall

6.7

Entertainment

6.4

Comfort

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
7,361 reviews
British Airways
6.7
Okay
7,361 reviews
Check prices

Food

6.3

Crew

7.6

Boarding

6.9

Overall

6.7

Entertainment

6.4

Comfort

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$ 701, United 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. All flights are typically direct.

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

    Currently priced at C$ 668, 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 Aer Lingus (64%), American Airlines (62%) and Air Canada (62%).

  • 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$ 1,032, our data indicates the cheapest price to be C$ 954. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around C$ 831.

  • 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, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport (average of C$ 560). Flying from Chicago O'Hare Intl Airport to London Heathrow Airport in July is currently the most expensive (average of C$ 856). 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
Brentford
Sutton
Hounslow
Slough
Marlow
Leamington Spa
Milton Keynes
Romford
Watford
Bedford
Luton
Southall

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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapestC$ 668AverageC$ 760FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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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?

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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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