Cheap flights from London to Pennsylvania from £261

In general, September is the cheapest month to fly from London to Pennsylvania. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £505. If you don’t want to visit Pennsylvania in September, then you should wait until May to fly from London, when ticket prices are also cheap, with an average price of £535.

According to our data, Wednesday is the cheapest day to fly to Pennsylvania from London. The lowest ticket price found for a Wednesday departure recently was £609. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Pennsylvania is Sunday, with ticket prices averaging around £678.

Flying to Pennsylvania from London in the morning is the least expensive time of day to depart. momondo users have found prices as low as £630 when looking at flights departing in the morning. In contrast, the most expensive time of day to depart to Pennsylvania is at midday when prices are around £633.

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

You are more likely to see cheaper flights to Pennsylvania from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Pennsylvania for around £578 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Pennsylvania from London for as low as £523 on momondo.

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

Norse Atlantic UK, United Airlines, and British Airways are the most popular carriers operating from London to Pennsylvania

British Airways, Finnair and Aer Lingus are the top three most popular airlines that fly to Pennsylvania from London according to our data. British Airways is the first choice among our users, with 77% of people opting to fly with this airline when travelling to Pennsylvania. Keep in mind that there are 11 different airlines that fly to Pennsylvania on a routine basis, so you have a few additional options to choose from.

The number of flights available between London and Pennsylvania is 146 per day as of March 2026. The most frequent departure time is 10:00, with 61% of daily flights leaving in the afternoon.

The number of flights available between London and Pennsylvania is 1,024 per week as of March 2026. The most frequent departure day is Wed, with 15% of weekly flights leaving on this day.