Search for cheap flights and last-minute deals with Netflights. We've scanned all the flights from London Heathrow to Philadelphia, across the ten airlines that offer this route. We've found that 09 / Sep / 2025 is the cheapest date to travel at the moment, but it's best to go through the results to see which flight suits you.
There are 1,223 flights from London Heathrow to or via Philadelphia every week. Out of the ten available airlines, the most popular ones are British Airways, Finnair & Air Canada. But that doesn’t necessarily mean they’ll be the best option for your travel dates. To see as many flights as possible, try widening your search to include other departure airports.
Your flight from London Heathrow to Philadelphia will take at least 7 hrs 55 mins. On average, it takes 10 hrs 45 mins to fly the 5694 km distance. Take a look at flight times to see which one works best for you.
If you want to travel in August, it's best to book your flights early, as this is peak season in Philadelphia. The cheapest month to fly is normally January – try searching three to four months prior to then to get a bargain. You can also search by month, which will reveal the cheapest time of the week to fly.
