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Cheap flights from Philadelphia to London Heathrow Airport

PHL — LHR
15 Jan — 22 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Philadelphia to London Heathrow are usually found in September or October, booked 9 days in advance, depart on a Monday or Tuesday and return on a Monday

Find flight deals from Philadelphia to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) 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 16 December 2025.

Popular in

June

Cheapest in

September

Average price

C$ 1,490
Highest demand for flights based on searches. 18% potential increase in price (C$ 342 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease (C$ 70 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Best time to book a flight from Philadelphia to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Philadelphia 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 Philadelphia to London Heathrow Airport

How far ahead should I book a flight from Philadelphia to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Heathrow. Price data was last updated on 12 December 2025.

The price you pay for your flight from Philadelphia to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 9 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Philadelphia to London Heathrow Airport?

Currently, February is the cheapest month in which you can book a flight from Philadelphia to London Heathrow Airport (average of C$ 537). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of C$ 794). 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 PHL to LHR?

Find hourly flight availability from Philadelphia 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 16 December 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to London Heathrow Airport as you normally would.

Related info for your journey

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

  • What airport do you fly from for flights from Philadelphia to London Heathrow?

    For a flight from Philadelphia to London Heathrow, you will be flying from Philadelphia. Philadelphia (PHL) is just 11.2 km from the centre of the city. Philadelphia is the only Philadelphia airport and it handles 7 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Philadelphia on a regular basis.

  • What are the most reliable airlines from Philadelphia to London Heathrow Airport?

    The top 3 most reliable airlines when flying from Philadelphia to London Heathrow Airport are Finnair (90%), Malaysia Airlines (89%) and American Airlines (87%).

  • Can I find deals for flights from Philadelphia to Heathrow that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Heathrow?

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

  • Can I find deals for business class flights from Philadelphia to Heathrow?

    Yes. Cheapflights offers flight deals from Philadelphia 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 Philadelphia to London Heathrow Airport?

    Currently, February is the cheapest month in which you can book a flight from Philadelphia to London Heathrow Airport (average of C$ 537). Flying from Philadelphia to London Heathrow Airport in June is currently the most expensive (average of C$ 794). 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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Alternative routes for Philadelphia to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
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Dulles Intl to Heathrow flights
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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 Philadelphia to Heathrow?

Deals for Philadelphia 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 Philadelphia to Heathrow?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Philadelphia to Heathrow.

Can Cheapflights find flights from Philadelphia to Heathrow with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Philadelphia to Heathrow, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Philadelphia to Heathrow become cheaper?

Of course! You can now track prices for flights from Philadelphia 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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