Cheap flights from Philadelphia to London from £204

In general, September is the cheapest month to fly from Philadelphia to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £489. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Philadelphia averaging around £499.

On average, the least expensive day to fly to London Heathrow Airport from Philadelphia is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as £501. 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 £740.

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 Philadelphia to London Heathrow Airport in the afternoon for as low as £585. 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 Philadelphia 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 Philadelphia - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £618 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 Philadelphia for as low as £515 on momondo.

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

You could potentially save up to 22% on your flight if you consider stops on a Philadelphia to London Heathrow Airport flight.

As of March 2026, prices for Philadelphia to London Heathrow Airport flights are approximately 15% cheaper when compared to flights at the same time last year.

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

Virgin Atlantic, British Airways and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from Philadelphia according to our data. Virgin Atlantic is the first choice among our users, with 40% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 12 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

As of March 2026, there are 10 flights per day flying from Philadelphia to London Heathrow Airport. The most common time of day flights depart is 18:00, with 100% of flights taking off in the evening.

As of March 2026, 70 flights take off from Philadelphia and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.