Cheap flights from London to Philadelphia from £451

If you aren’t able to travel during the month of February, then book flights to Philadelphia from London during April instead. Flights to Philadelphia in April, while not as cheap as those in February, still average around £297.

Our data shows that Tuesday is the least expensive day to fly to Philadelphia. Tickets to fly out on this day can be as low as £594. On the other hand, Sunday is the most expensive day to depart from London because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £659.

The cheapest time of day to fly to Philadelphia is at midday when flights can be purchased for as low as £615. In the morning is when there is more demand to fly to Philadelphia, so prices are often more expensive at around £616 per ticket.

Fly from London Heathrow to Philadelphia for the best London - Philadelphia flight prices

You are more likely to see cheaper flights to Philadelphia from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around £583 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from London for as low as £529 on momondo.

You could potentially save up to 14% on your flight if you consider stops on a London to Philadelphia flight.

As of May 2026, prices for London to Philadelphia flights are approximately 2% more expensive when compared to flights at the same time last year.

Delta, British Airways, and TAP AIR PORTUGAL are the most popular carriers operating from London to Philadelphia

Virgin Atlantic, British Airways and Lufthansa are the top three most popular airlines that fly to Philadelphia from London according to our data. Virgin Atlantic is the first choice among our users, with 48% of people opting to fly with this airline when travelling to Philadelphia. Keep in mind that there are 23 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

Historically, on average around 19% of flights between London and Philadelphia have experienced a delay on any given week. The average delay length over the past 12 months has been 170 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, American Airlines have had the fewest delays on this route over the last 12 months, with about 19% of their flights experiencing any sort of delay.

Dublin (DUB) was the most common stop: 64% of momondo users choosing one-stop flights on this route connected there.

Flights via Boston (BOS) offer the lowest average return price of £499.

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 10h 18m.

Montreal (YUL) has the shortest average stopover time for this route: 1h 26m.

15 flights are operational daily from London to Philadelphia as of May 2026. The most popular departure time for this route is 09:00, with 66% of flights per day taking off in the afternoon.

105 flights are operational weekly from London to Philadelphia as of May 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.