571 € Cheap Flights from London Heathrow to Philadelphia International

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Compare London Heathrow to Philadelphia International flight deals

Find the cheapest month or even day of the year to fly to Philadelphia International

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Flight deals from London Heathrow to Philadelphia International

Looking for a cheap last-minute deal or the best return flight from London Heathrow Airport to Philadelphia International Airport? If you want to travel next month, return fares start from 576 €. Find the lowest prices on one-way and return tickets right here.

Philadelphia.571 € per passenger.Departing Tue, 1 Dec, returning Tue, 15 Dec.Return flight with Icelandair and Frontier Airlines.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 1 Dec, arriving in Philadelphia International.Inbound indirect flight with Frontier Airlines, departs from Philadelphia International on Tue, 15 Dec, arriving in London Heathrow.Price includes taxes and charges.From 571 €, select.

Philadelphia.576 € per passenger.Departing Thu, 1 Oct, returning Tue, 6 Oct.Return flight with Eurowings and Aer Lingus.Outbound indirect flight with Eurowings, departs from London Heathrow on Thu, 1 Oct, arriving in Philadelphia International.Inbound indirect flight with Aer Lingus, departs from Philadelphia International on Tue, 6 Oct, arriving in London Heathrow.Price includes taxes and charges.From 576 €, select.

Philadelphia.579 € per passenger.Departing Tue, 24 Nov, returning Tue, 1 Dec.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Tue, 24 Nov, arriving in Philadelphia International.Inbound indirect flight with Aer Lingus, departs from Philadelphia International on Tue, 1 Dec, arriving in London Heathrow.Price includes taxes and charges.From 579 €, select.

Philadelphia.580 € per passenger.Departing Fri, 13 Nov, returning Mon, 16 Nov.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Fri, 13 Nov, arriving in Philadelphia International.Inbound indirect flight with Aer Lingus, departs from Philadelphia International on Mon, 16 Nov, arriving in London Heathrow.Price includes taxes and charges.From 580 €, select.

Philadelphia.592 € per passenger.Departing Wed, 28 Oct, returning Sun, 1 Nov.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Wed, 28 Oct, arriving in Philadelphia International.Inbound indirect flight with Aer Lingus, departs from Philadelphia International on Sun, 1 Nov, arriving in London Heathrow.Price includes taxes and charges.From 592 €, select.

Philadelphia.608 € per passenger.Departing Mon, 8 Mar, returning Sun, 14 Mar.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Mon, 8 Mar, arriving in Philadelphia International.Inbound indirect flight with Aer Lingus, departs from Philadelphia International on Sun, 14 Mar, arriving in London Heathrow.Price includes taxes and charges.From 608 €, select.

Philadelphia.608 € per passenger.Departing Tue, 22 Sep, returning Tue, 6 Oct.Return flight with Virgin Atlantic and Frontier Airlines.Outbound indirect flight with Virgin Atlantic, departs from London Heathrow on Tue, 22 Sep, arriving in Philadelphia International.Inbound indirect flight with Frontier Airlines, departs from Philadelphia International on Tue, 6 Oct, arriving in London Heathrow.Price includes taxes and charges.From 608 €, select.

Philadelphia.623 € per passenger.Departing Mon, 14 Sep, returning Mon, 21 Sep.Return flight with jetBlue.Outbound indirect flight with jetBlue, departs from London Heathrow on Mon, 14 Sep, arriving in Philadelphia International.Inbound indirect flight with jetBlue, departs from Philadelphia International on Mon, 21 Sep, arriving in London Heathrow.Price includes taxes and charges.From 623 €, select.

Philadelphia.647 € per passenger.Departing Thu, 22 Oct, returning Mon, 14 Dec.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Thu, 22 Oct, arriving in Philadelphia International.Inbound indirect flight with Aer Lingus, departs from Philadelphia International on Mon, 14 Dec, arriving in London Heathrow.Price includes taxes and charges.From 647 €, select.

Philadelphia.649 € per passenger.Departing Mon, 1 Feb, returning Mon, 8 Feb.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from London Heathrow on Mon, 1 Feb, arriving in Philadelphia International.Inbound indirect flight with Air Canada, departs from Philadelphia International on Mon, 8 Feb, arriving in London Heathrow.Price includes taxes and charges.From 649 €, select.

Philadelphia.650 € per passenger.Departing Mon, 25 Jan, returning Mon, 1 Feb.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from London Heathrow on Mon, 25 Jan, arriving in Philadelphia International.Inbound indirect flight with Air Canada, departs from Philadelphia International on Mon, 1 Feb, arriving in London Heathrow.Price includes taxes and charges.From 650 €, select.

Philadelphia.650 € per passenger.Departing Tue, 12 Jan, returning Tue, 19 Jan.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from London Heathrow on Tue, 12 Jan, arriving in Philadelphia International.Inbound indirect flight with Air Canada, departs from Philadelphia International on Tue, 19 Jan, arriving in London Heathrow.Price includes taxes and charges.From 650 €, select.

Philadelphia.653 € per passenger.Departing Mon, 19 Apr, returning Wed, 28 Apr.Return flight with United.Outbound indirect flight with United, departs from London Heathrow on Mon, 19 Apr, arriving in Philadelphia International.Inbound indirect flight with United, departs from Philadelphia International on Wed, 28 Apr, arriving in London Heathrow.Price includes taxes and charges.From 653 €, select.

Philadelphia.654 € per passenger.Departing Wed, 5 May, returning Tue, 11 May.Return flight with United.Outbound indirect flight with United, departs from London Heathrow on Wed, 5 May, arriving in Philadelphia International.Inbound indirect flight with United, departs from Philadelphia International on Tue, 11 May, arriving in London Heathrow.Price includes taxes and charges.From 654 €, select.

Philadelphia.658 € per passenger.Departing Mon, 7 Dec, returning Thu, 7 Jan.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from London Heathrow on Mon, 7 Dec, arriving in Philadelphia International.Inbound indirect flight with Air Canada, departs from Philadelphia International on Thu, 7 Jan, arriving in London Heathrow.Price includes taxes and charges.From 658 €, select.

Philadelphia.660 € per passenger.Departing Thu, 25 Mar, returning Fri, 16 Apr.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Thu, 25 Mar, arriving in Philadelphia International.Inbound indirect flight with Aer Lingus, departs from Philadelphia International on Fri, 16 Apr, arriving in London Heathrow.Price includes taxes and charges.From 660 €, select.

Find the cheapest month to fly from London Heathrow to Philadelphia International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to Philadelphia International flights are currently cheapest in December.

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Direct flights from London Heathrow to Philadelphia International

London Heathrow to Philadelphia International: Alternative routes

Compare routes from London Heathrow to Philadelphia below. You may find an airport to fly into that's cheaper, faster, or easier than Philadelphia International.

London to Philadelphia: Flight information

The things to know before you go.

Cheapest flight found	571 €
Cheapest month to fly	December
Average flight time	8 hrs, 4 mins
Most popular airline	American Airlines
Average flights per week	107

Finding cheap flights from London Heathrow to Philadelphia International: Frequently asked questions

How much are return flights from London Heathrow to Philadelphia International?

The best price we found for a return flight from London Heathrow to Philadelphia International is 571 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from London Heathrow to Philadelphia International?

8 hours and 4 minutes is the average flight time from London Heathrow to Philadelphia International.

Which airlines fly direct from London Heathrow to Philadelphia International?

American Airlines, Finnair and Iberia fly direct from London Heathrow to Philadelphia International.

How many flights are there a week from London Heathrow to Philadelphia International?

As of September 2026, there are 107 flights per week flying from London Heathrow to Philadelphia International.

When is the cheapest time to fly from London Heathrow to Philadelphia International?

The cheapest month to fly from London Heathrow to Philadelphia International is usually December.

Which upcoming date is cheapest to fly from London Heathrow Airport to Philadelphia International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Philadelphia International Airport on Tuesday, 1 December 2026.

Can I get a direct flight from London Heathrow Airport to Philadelphia International Airport?

Yes – the average flight time is 8 hours and 4 minutes.

How can I find the best flight deal to Philadelphia International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Philadelphia International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Philadelphia?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Philadelphia is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from London Heathrow Airport to Philadelphia International with?

Currently, Icelandair and Iberia offer the cheapest flight tickets to Philadelphia International.

Flying from London Heathrow Airport (LHR) to Philadelphia International Airport (PHL): what you need to know

Jump on a direct flight from London Heathrow Airport to Philadelphia International Airport and you'll be travelling for an average of 8 hours.
The timezone in Philadelphia is UTC-5, which is five hours behind London.
You can choose from 18 weekly London Heathrow Airport to Philadelphia International Airport flights. The 10:05 departure with American Airlines is the earliest available. American Airlines operates the latest service of the day at 14:10.
Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for hassle-free flying. Make sure you're at the airport on time to board your LHR to PHL flight.
Be prepared for longer queues in popular months such as July. Arriving up to four hours in advance for international flights and two hours for a domestic departure is a smart move.
American Airlines offers direct flights from London Heathrow Airport to Philadelphia International Airport. Book with this popular carrier, then get ready to see the sights in Philadelphia — and maybe even more of the United States if you have time.
Most passengers choose to travel with American Airlines on this route.
American Airlines ranks as the top on-time carrier for LHR to PHL flights, with 80.77% of services arriving as scheduled.
If you'd like to include a stop along the way, just uncheck 'Direct flights only' when searching for your ticket from London Heathrow Airport to Philadelphia International Airport. Here are the most popular stopovers between LHR and PHL:
- New York Newark Airport
- Boston Logan International Airport
- Toronto Pearson International Airport

Handy information about London Heathrow Airport (LHR)

Of the departures from London Heathrow Airport, 78% land on time at their destination.
London Heathrow Airport is about 24 kilometres from central London. If you're driving, catching a taxi or ride-sharing from the centre, it'll take 45 minutes or so to arrive, depending on the traffic.
Planning to take public transport? Expect a trip time of around 25 minutes.
Need a handy hotel close to LHR? If you're boarding an early flight from London Heathrow Airport to Philadelphia International Airport, these accommodation options will have you sleeping moments from your departure lounge:

Arriving at Philadelphia International Airport (PHL)

The last thing you want is a lengthy journey to your hotel if you're landing late on a London Heathrow Airport to Philadelphia International Airport flight. Check in to one of these accommodation options near PHL instead:
Go where the road takes you with a Philadelphia International Airport rental car. Book your wheels from Dollar, Thrifty or Budget and chase adventure across Philadelphia and beyond.
Lock in the best rate by reserving your ride from Philadelphia International Airport around three weeks before your trip.

When to fly to Philadelphia International Airport (PHL)

August is the most popular month for flights from London Heathrow Airport to Philadelphia International Airport. To skip the crowds, travel to Philadelphia in March.
When reserving your flight from London Heathrow Airport to Philadelphia International Airport, consider the type of weather you like. July is the warmest month in Philadelphia, with the temperature ranging from 18ºC (64ºF) to 32ºC (90ºF).
If you want cooler conditions, look for a cheap ticket from LHR to PHL in January. Temperatures average between -7ºC (19ºF) and 9ºC (48ºF) then.

Explore more of the United States

New York is just one of the many cities in the United States waiting to be explored after you've seen Philadelphia. Around 129 kilometres away to the north-east, top sights here include Central Park, Statue of Liberty and Metropolitan Museum of Art.
Around 434 kilometres north-east of Philadelphia, Boston is another favourite stop in the United States. Experience major highlights starting with Museum of Fine Arts Boston, Freedom Trail and USS Constitution Museum.