Cheap flights from Pennsylvania to London from £139

The cheapest month to fly to London from Pennsylvania is in January. Flight prices, which tend to average around £533, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Pennsylvania averaging around £535.

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £664. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Pennsylvania to London for around £1,106.

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £725. Flights in the evening are often more expensive, with an average ticket price of £764.

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

You are more likely to see cheaper flights to London from Pennsylvania when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £717 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Pennsylvania for as low as £552 on momondo.

There are 3 cabin classes available to choose from on Pennsylvania to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Icelandair, British Airways, and Air Canada are the most popular carriers operating from Pennsylvania to London

British Airways, United Airlines and American Airlines are the top three most popular airlines that fly to London from Pennsylvania according to our data. British Airways is the first choice among our users, with 73% of people opting to fly with this airline when travelling to London. Keep in mind that there are 3 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

162 flights are operational daily from Pennsylvania to London as of August 2026. The most popular departure time for this route is 19:00, with 100% of flights per day taking off in the evening.

As of August 2026, there are 1,139 flights per week flying from Pennsylvania to London. The most common day of the week flights depart is Mon, with 17% of flights taking off on this day.