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Cheap flights from Chicago O'Hare Intl Airport to London Heathrow Airport from C$ 326

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 22/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
3 Aug — 10 Aug1
1 adult

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 Friday

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 29 July 2025.

Round-trip from

C$ 713

One-way from

C$ 326

Popular in

June

Cheapest in

February

Average price

C$ 1,340

Good round-trip deal

C$ 662 or less
Virgin Atlantic
  • Virgin Atlantic
  • 27/8-10/9
  • 2 total stops
  • 29h 15m total
  • Chicago to London
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TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 22/9
  • 1 total stop
  • 17h 35m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (C$ 373 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease (C$ 77 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals
Price to beat on a round-trip flight from Chicago O'Hare Intl to London Heathrow.
Search Deals

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 29 July 2025.

Wed 27/810:15 a.m.ORD - LHR
1 stop14h 30mVirgin Atlantic
Wed 10/96:15 a.m.LHR - ORD
1 stop14h 45mVirgin Atlantic
Deal found 29/7C$ 713
Sun 24/87:59 p.m.ORD - LHR
1 stop11h 31mDelta
Thu 25/98:40 a.m.LHR - ORD
1 stop11h 30mDelta
Deal found 29/7C$ 715
Sat 15/117:20 p.m.ORD - LHR
2 stops20h 15mScandinavian Airlines
Mon 17/1110:20 a.m.LHR - ORD
1 stop12h 25mScandinavian Airlines
Deal found 29/7C$ 716
Sun 24/84:05 p.m.ORD - LHR
Nonstop8h 15mUnited Airlines
Fri 19/99:30 a.m.LHR - ORD
1 stop11h 25mUnited Airlines
Deal found 29/7C$ 717
Mon 25/87:05 p.m.ORD - LHR
1 stop30h 50mSWISS
Mon 22/96:40 p.m.LHR - ORD
1 stop27h 15mSWISS
Deal found 29/7C$ 720
Sun 28/97:25 p.m.ORD - LHR
1 stop10h 30mIcelandair
Sun 19/109:25 p.m.LHR - ORD
1 stop26h 50mIcelandair
Deal found 29/7C$ 727
Sun 28/94:20 p.m.ORD - LHR
1 stop23h 20mAustrian Airlines
Fri 17/106:00 a.m.LHR - ORD
1 stop13h 20mAustrian Airlines
Deal found 29/7C$ 735
Thu 21/85:40 p.m.ORD - LHR
Nonstop7h 40mFinnair
Wed 27/810:20 a.m.LHR - ORD
1 stop13h 30mFinnair
Deal found 27/7C$ 746
Mon 22/95:40 p.m.ORD - LHR
Nonstop7h 40mBritish Airways
Sun 5/1012:15 p.m.LHR - ORD
Nonstop8h 35mBritish Airways
Deal found 29/7C$ 753
Sun 10/89:25 p.m.ORD - LHR
Nonstop8h 20mMultiple Airlines
Tue 19/88:05 p.m.LHR - ORD
1 stop25h 50mMultiple Airlines
Deal found 28/7C$ 772
Mon 4/84:15 p.m.ORD - LHR
1 stop10h 45mKLM
Thu 14/811:45 a.m.LHR - ORD
1 stop12h 20mKLM
Deal found 29/7C$ 775

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 29 July 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 27/8

10:15 a.m.-6:45 a.m.

1 stop14h 30m

London Heathrow

Wed 10/9

6:15 a.m.-3:00 p.m.

1 stop14h 45m

C$ 713

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 15/11

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

1 stop10h 20m

London Heathrow

Tue 18/11

12:15 p.m.-5:20 p.m.

1 stop11h 05m

C$ 716

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 24/8

7:15 p.m.-9:10 a.m.

Nonstop7h 55m

London Heathrow

Tue 16/9

1:10 p.m.-3:55 p.m.

Nonstop8h 45m

C$ 717

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 25/8

7:05 p.m.-7:55 a.m.

1 stop30h 50m

London Heathrow

Mon 22/9

6:40 p.m.-3:55 p.m.

1 stop27h 15m

C$ 720

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 2/9

2:32 p.m.-6:55 a.m.

1 stop10h 23m

London Heathrow

Tue 16/9

8:30 a.m.-11:30 a.m.

Nonstop9h 00m

C$ 723

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 28/9

4:20 p.m.-9:40 p.m.

1 stop23h 20m

London Heathrow

Fri 17/10

6:00 a.m.-1:20 p.m.

1 stop13h 20m

C$ 735

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 27/8

9:30 p.m.-5:05 p.m.

1 stop13h 35m

London Heathrow

Thu 4/9

3:10 p.m.-11:59 p.m.

1 stop14h 49m

C$ 745

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 25/12

7:20 p.m.-9:35 a.m.

2 stops56h 15m

London Heathrow

Mon 29/12

6:40 a.m.-4:45 p.m.

1 stop16h 05m

C$ 759

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 10/8

9:25 p.m.-11:45 a.m.

Nonstop8h 20m

London Heathrow

Tue 19/8

8:05 p.m.-3:55 p.m.

1 stop25h 50m

C$ 772

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 25/8

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

1 stop14h 10m

London Heathrow

Mon 1/9

8:25 p.m.-12:30 p.m.

1 stop22h 05m

C$ 775

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/7

Showing 1-10 of 20 results
1
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 25 July 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$ 857). 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 29 July 2025.

When flying from Chicago O'Hare Intl Airport to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 6% versus a flight in the morning.

Weekly flight availability from Chicago O'Hare Intl Airport to London Heathrow Airport

Explore weekly flight availability from O'Hare Intl to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 29 July 2025.

The most flights from ORD to LHR are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (51 on average).

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 29 July 2025.
Read through reviews of airlines operating flights from Chicago O'Hare Intl Airport to London Heathrow Airport, such as Delta,KLM, andAustrian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,979 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
821 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,683 reviews
Delta
8.0
Very good
7,979 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

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

    Currently priced at C$ 713, Delta will fly you from Chicago O'Hare Intl Airport to London Heathrow Airport and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Scandinavian Airlines and United Airlines - these airlines can fly you to your destination from C$ 716 and C$ 717, respectively. Delta is priced at 34% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Chicago O'Hare Intl Airport to London Heathrow Airport one-way?

    To fly one-way, consider booking your trip with TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at C$ 326. Icelandair flights start at C$ 359 while deals on JetBlue start at C$ 429 one-way.

  • 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 (66%), Austrian Airlines (66%) and United Airlines (66%).

  • 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$ 717, our data indicates the cheapest price to be C$ 636. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around C$ 779.

  • 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$ 857). 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
Bromley
Luton
Bedford
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 29 July 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapestC$ 636AverageC$ 717FlexibilityNo 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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