Cheap flights from London to Pennsylvania from $347

The month of September is, on average, the cheapest month to fly to Pennsylvania from London, with most prices found around $670. 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 $712.

The cheapest day to depart on your flight to Pennsylvania is on a Thursday when prices can be found for as low as $781. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $956. These prices are subject to change though, so be sure to set up a Price Alert for flights to Pennsylvania.

Our most recent data shows that the best time of day to fly to Pennsylvania is at noon. Flights from London to Pennsylvania during this time can be as low as $791. In contrast, the most expensive time of day to depart to Pennsylvania is in the morning when prices are around $830.

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 $768 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Pennsylvania from London for as low as $694 on momondo.

There are 4 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.

Icelandair, United Airlines, and Air Canada are the most popular carriers operating from London to Pennsylvania

British Airways, American Airlines 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 72% of people opting to fly with this airline when traveling to Pennsylvania. Keep in mind that there are 4 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 148 per day as of March 2026. The most frequent departure time is 10:00AM, with 61% of daily flights leaving in the afternoon.

The number of flights available between London and Pennsylvania is 1,039 per week as of March 2026. The most frequent departure day is Fri, with 15% of weekly flights leaving on this day.