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Cheap Flights from London to Philadelphia

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Compare London Heathrow to Philadelphia International flight deals

Find the cheapest month or even day of the year to fly to Philadelphia International

Book the best Philadelphia International fare with no extra fees

Flight deals from London Heathrow to Philadelphia International

Looking for a cheap last-minute deal or the best return flight from London Heathrow to Philadelphia International? Find the lowest prices on one-way and return tickets right here.
Philadelphia.$761 per passenger.Departing Thu, 5 Jun, returning Thu, 12 Jun.Return flight with Lufthansa and Air Canada.Outbound indirect flight with Lufthansa, departs from London Heathrow on Thu, 5 Jun, arriving in Philadelphia International.Inbound indirect flight with Air Canada, departs from Philadelphia International on Thu, 12 Jun, arriving in London Heathrow.Price includes taxes and charges.From $761, select.
Philadelphia.$955 per passenger.Departing Tue, 9 Sep, returning Tue, 16 Sep.Return flight with Lufthansa.Outbound indirect flight with Lufthansa, departs from London Heathrow on Tue, 9 Sep, arriving in Philadelphia International.Inbound indirect flight with Lufthansa, departs from Philadelphia International on Tue, 16 Sep, arriving in London Heathrow.Price includes taxes and charges.From $955, select.
Philadelphia.$963 per passenger.Departing Fri, 9 May, returning Mon, 12 May.Return flight with United.Outbound indirect flight with United, departs from London Heathrow on Fri, 9 May, arriving in Philadelphia International.Inbound indirect flight with United, departs from Philadelphia International on Mon, 12 May, arriving in London Heathrow.Price includes taxes and charges.From $963, select.
Philadelphia.$988 per passenger.Departing Tue, 13 May, returning Wed, 4 Jun.Return flight with Lufthansa.Outbound indirect flight with Lufthansa, departs from London Heathrow on Tue, 13 May, arriving in Philadelphia International.Inbound indirect flight with Lufthansa, departs from Philadelphia International on Wed, 4 Jun, arriving in London Heathrow.Price includes taxes and charges.From $988, select.
Philadelphia.$991 per passenger.Departing Fri, 29 Aug, returning Wed, 17 Sep.Return flight with Lufthansa.Outbound indirect flight with Lufthansa, departs from London Heathrow on Fri, 29 Aug, arriving in Philadelphia International.Inbound indirect flight with Lufthansa, departs from Philadelphia International on Wed, 17 Sep, arriving in London Heathrow.Price includes taxes and charges.From $991, select.
Philadelphia.$993 per passenger.Departing Thu, 19 Jun, returning Fri, 19 Sep.Return flight with United.Outbound indirect flight with United, departs from London Heathrow on Thu, 19 Jun, arriving in Philadelphia International.Inbound indirect flight with United, departs from Philadelphia International on Fri, 19 Sep, arriving in London Heathrow.Price includes taxes and charges.From $993, select.
Philadelphia.$994 per passenger.Departing Thu, 15 May, returning Mon, 7 Jul.Return flight with United.Outbound indirect flight with United, departs from London Heathrow on Thu, 15 May, arriving in Philadelphia International.Inbound indirect flight with United, departs from Philadelphia International on Mon, 7 Jul, arriving in London Heathrow.Price includes taxes and charges.From $994, select.
Philadelphia.$998 per passenger.Departing Tue, 29 Apr, returning Sun, 4 May.Return flight with United.Outbound indirect flight with United, departs from London Heathrow on Tue, 29 Apr, arriving in Philadelphia International.Inbound indirect flight with United, departs from Philadelphia International on Sun, 4 May, arriving in London Heathrow.Price includes taxes and charges.From $998, select.

Find the cheapest month to fly from London Heathrow to Philadelphia International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to Philadelphia International flights are currently cheapest in June.
Apr
from $1,715
May
from $963
Jun
from $761
Jul
from $1,025
Aug
from $1,204
Sep
from $955
Oct
from $1,101
Nov
from $1,045
Dec
from $1,048
Jan
from $1,044
Feb
from $1,045
Mar
from $1,077

Direct flights from London Heathrow to Philadelphia International

London Heathrow to Philadelphia International: Alternative routes

Compare routes from London Heathrow to Philadelphia below. You may find an airport to fly into that's cheaper, faster, or easier than Philadelphia International.

London to Philadelphia: Flight information

The things to know before you go.
Cheapest flight found$761
Cheapest month to flyJune
Average flight time7 hrs, 58 mins
Most popular airlineFinnair
Average flights per week96

Finding cheap flights from London Heathrow to Philadelphia International: Frequently asked questions

The best price we found for a return flight from London Heathrow to Philadelphia International is $761. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
7 hours and 58 minutes is the average flight time from London Heathrow to Philadelphia International.
Finnair, American Airlines and Iberia fly direct from London Heathrow to Philadelphia International.
As of April 2025, there are 96 flights per week flying from London Heathrow to Philadelphia International.
The cheapest month to fly from London Heathrow to Philadelphia International is usually April 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Philadelphia International Airport on Thursday, 5 June 2025.
Yes – the average flight time is 7 hours and 58 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Philadelphia International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Philadelphia is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Lufthansa and British Airways offer the cheapest flight tickets to Philadelphia International.

Flying from London Heathrow Airport (LHR) to Philadelphia International Airport (PHL): what you need to know

  • Book a direct flight from London Heathrow Airport to Philadelphia International Airport and you'll be travelling for an average of 8 hours 5 minutes.

  • The timezone in Philadelphia is UTC-4, which is four hours behind London.

  • Flights from LHR to PHL start from 09:45 — the first with American Airlines. The last service of the day is at 13:40 with British Airways. In total, you can choose from 26 weekly London Heathrow Airport to Philadelphia International Airport flights.

  • To ensure you get on your LHR to PHL flight, leave plenty of time to navigate the airport and find your gate. Arriving two hours ahead of international departures and one hour before domestic flights is the standard rule.

  • Be prepared for longer lines during popular months like July. Arriving up to four hours ahead of international flights and two hours for a domestic departure is a good idea.

  • American Airlines has direct flights from London Heathrow Airport to Philadelphia International Airport. Book with this popular carrier, then get ready to tick off the sights in Philadelphia — and maybe even more of United States if time allows.

  • The majority of passengers choose to travel with American Airlines on this route.

  • With 75.41% of its services arriving as scheduled, American Airlines is the most punctual carrier operating LHR to PHL flights.

  • Think about adding a stopover when booking your ticket from London Heathrow Airport to Philadelphia International Airport. Just uncheck 'Direct flights only' to break up your trip, or visit a new city along the way. Here are some options between LHR and PHL:

    • Logan International Airport

    • Newark Liberty International Airport

    • Dublin Airport

How to find the cheapest flights from London Heathrow Airport (LHR) to Philadelphia International Airport (PHL)

  • The cheapest price we've seen for a one-way London Heathrow Airport to Philadelphia International Airport flight is $687. A return ticket right now is $761. Depending on the availability when you book, these fares may change.

  • Book six months before flying. After crunching the numbers on our calendar, this is how far you'll want to book ahead to secure cheap tickets from LHR to PHL.

  • The cheapest month for flights from London Heathrow Airport to Philadelphia International Airport is May. Use the 'Whole month' tool to see the lowest prices if you have flexible dates.

  • Finding cheap flights from LHR to PHL is a piece of cake with Price Alerts. All you need to do is create one of these automatic alerts and we'll get in touch as soon as there's a better deal.

  • Tailor your flights using filters. Select your arrival and departure times, total journey duration and airlines. You can also sort results by 'Best,' 'Cheapest' or 'Fastest' flights from London Heathrow Airport to Philadelphia International Airport.

Handy information about London Heathrow Airport (LHR)

  • Of all flights leaving London Heathrow Airport, 68.18% touch down on time at their destination.

  • Central London to London Heathrow Airport is approximately 31 kilometres. Depending on traffic, it'll take you about 55 minutes to get there if you're catching a cab, ride-sharing or driving.

  • The trip on public transport takes about 1 hour.

  • Looking for a convenient hotel near LHR? If you've booked an early flight from London Heathrow Airport to Philadelphia International Airport, these stays will put you moments from your departure lounge:

Arriving at Philadelphia International Airport (PHL)

Getting from Philadelphia International Airport (PHL) to central Philadelphia

  • You'll find PHL at Industrial Highway and Island Road.

  • From Philadelphia International Airport, Philadelphia is approximately 19 kilometres away. It takes around 15 minutes to drive to the centre.

  • If you're travelling on public transport, expect a journey of around 45 minutes.

When to fly to Philadelphia International Airport (PHL)

  • The quietest month for a flight from London Heathrow Airport to Philadelphia International Airport is February, while August is the most popular. Pick the ideal time to visit Philadelphia based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • The warmest month in Philadelphia is July, with temperatures ranging between 18ºC (64ºF) and 32ºC (90ºF). Book your flights from London Heathrow Airport to Philadelphia International Airport in this month if you enjoy this type of weather.

  • January sees average temperatures of between -7ºC (19ºF) and 9ºC (48ºF). Search for cheap tickets from LHR to PHL sometime around then if you like cooler conditions.

Explore more of United States

  • New York is just one of the many places in United States waiting to be discovered once you've taken in the sights of Philadelphia. Around 129 kilometres away to the north-east, check out popular attractions including Statue of Liberty, Central Park and Empire State Building.

  • Boston is another standout destination in United States and is around 434 kilometres north-east of Philadelphia. No journey is complete without a visit to Freedom Trail, Museum of Fine Arts Boston and Boston Tea Party Ships & Museum.

Plan the rest of your trip from London to Philadelphia

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.