Cheap flights from Pennsylvania to London from £169

In general, September is the cheapest month to fly from Pennsylvania to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £492. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Pennsylvania averaging around £501.

On average, the least expensive day to fly to London Heathrow Airport from Pennsylvania is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £503. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £744.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Pennsylvania to London Heathrow Airport in the afternoon for as low as £586. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are £588 on average. Flights to London Heathrow Airport from Pennsylvania in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to London Heathrow Airport from Pennsylvania when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £621 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Pennsylvania for as low as £518 on momondo.

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

TAP AIR PORTUGAL, British Airways, and United Airlines are the most popular carriers operating from Pennsylvania to London Heathrow

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from Pennsylvania according to our data. British Airways is the first choice among our users, with 71% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 4 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

169 flights are operational daily from Pennsylvania to London Heathrow Airport as of March 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 March 2026, there are 1,186 flights per week flying from Pennsylvania to London Heathrow Airport. The most common day of the week flights depart is Fri, with 16% of flights taking off on this day.