Cheap flights from Philadelphia to London from £163

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 £510. The month of August is another great option to travel to London Heathrow Airport, with average flight prices from Philadelphia averaging around £515.

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 £529. 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 £1,098.

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 £666. 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 £677 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 £676 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 £492 on momondo.

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

No. A direct flight is the cheapest option for a flight between Philadelphia to London Heathrow Airport.

As of June 2026, prices for Philadelphia to London Heathrow Airport flights are approximately 17% cheaper when compared to flights at the same time last year.

United Airlines and JetBlue are the most popular carriers operating from Philadelphia to London Heathrow

British Airways, Virgin Atlantic and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from Philadelphia according to our data. British Airways is the first choice among our users, with 36% 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 June 2026, there are 15 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 June 2026, 105 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.