591 € Cheap Flights from Philadelphia International to London Heathrow

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Compare Philadelphia International to London Heathrow flight deals

Find the cheapest month or even day of the year to fly to London Heathrow

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Flight deals from Philadelphia International to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Philadelphia International Airport to London Heathrow Airport? If you want to travel next month, return fares start from 663 €. Find the lowest prices on one-way and return tickets right here.

London.591 € per passenger.Departing Sun, 25 Oct, returning Sun, 8 Nov.Return flight with Aer Lingus and Eurowings.Outbound indirect flight with Aer Lingus, departs from Philadelphia International on Sun, 25 Oct, arriving in London Heathrow.Inbound indirect flight with Eurowings, departs from London Heathrow on Sun, 8 Nov, arriving in Philadelphia International.Price includes taxes and charges.From 591 €, select.

London.629 € per passenger.Departing Thu, 5 Nov, returning Mon, 16 Nov.Return flight with Aer Lingus and Vueling Airlines.Outbound indirect flight with Aer Lingus, departs from Philadelphia International on Thu, 5 Nov, arriving in London Heathrow.Inbound indirect flight with Vueling Airlines, departs from London Heathrow on Mon, 16 Nov, arriving in Philadelphia International.Price includes taxes and charges.From 629 €, select.

London.635 € per passenger.Departing Fri, 4 Dec, returning Fri, 11 Dec.Return flight with Frontier Airlines and Icelandair.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Fri, 4 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Fri, 11 Dec, arriving in Philadelphia International.Price includes taxes and charges.From 635 €, select.

London.663 € per passenger.Departing Sun, 4 Oct, returning Thu, 15 Oct.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from Philadelphia International on Sun, 4 Oct, arriving in London Heathrow.Inbound indirect flight with Aer Lingus, departs from London Heathrow on Thu, 15 Oct, arriving in Philadelphia International.Price includes taxes and charges.From 663 €, select.

London.681 € per passenger.Departing Mon, 11 Jan, returning Wed, 13 Jan.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from Philadelphia International on Mon, 11 Jan, arriving in London Heathrow.Inbound indirect flight with Air Canada, departs from London Heathrow on Wed, 13 Jan, arriving in Philadelphia International.Price includes taxes and charges.From 681 €, select.

London.682 € per passenger.Departing Sat, 28 Nov, returning Wed, 2 Dec.Return flight with Frontier Airlines and Icelandair.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Sat, 28 Nov, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 2 Dec, arriving in Philadelphia International.Price includes taxes and charges.From 682 €, select.

London.685 € per passenger.Departing Mon, 12 Apr, returning Fri, 23 Apr.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from Philadelphia International on Mon, 12 Apr, arriving in London Heathrow.Inbound indirect flight with Aer Lingus, departs from London Heathrow on Fri, 23 Apr, arriving in Philadelphia International.Price includes taxes and charges.From 685 €, select.

London.692 € per passenger.Departing Wed, 23 Sep, returning Fri, 2 Oct.Return flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from Philadelphia International on Wed, 23 Sep, arriving in London Heathrow.Inbound indirect flight with Aer Lingus, departs from London Heathrow on Fri, 2 Oct, arriving in Philadelphia International.Price includes taxes and charges.From 692 €, select.

London.703 € per passenger.Departing Sun, 31 Jan, returning Mon, 1 Feb.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from Philadelphia International on Sun, 31 Jan, arriving in London Heathrow.Inbound indirect flight with Air Canada, departs from London Heathrow on Mon, 1 Feb, arriving in Philadelphia International.Price includes taxes and charges.From 703 €, select.

London.721 € per passenger.Departing Thu, 25 Mar, returning Tue, 30 Mar.Return flight with Aer Lingus and Eurowings.Outbound indirect flight with Aer Lingus, departs from Philadelphia International on Thu, 25 Mar, arriving in London Heathrow.Inbound indirect flight with Eurowings, departs from London Heathrow on Tue, 30 Mar, arriving in Philadelphia International.Price includes taxes and charges.From 721 €, select.

London.730 € per passenger.Departing Wed, 23 Sep, returning Wed, 30 Sep.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Philadelphia International on Wed, 23 Sep, arriving in London Heathrow.Inbound indirect flight with Iberia, departs from London Heathrow on Wed, 30 Sep, arriving in Philadelphia International.Price includes taxes and charges.From 730 €, select.

London.733 € per passenger.Departing Wed, 24 Feb, returning Thu, 4 Mar.Return flight with Finnair and British Airways.Outbound indirect flight with Finnair, departs from Philadelphia International on Wed, 24 Feb, arriving in London Heathrow.Inbound indirect flight with British Airways, departs from London Heathrow on Thu, 4 Mar, arriving in Philadelphia International.Price includes taxes and charges.From 733 €, select.

London.741 € per passenger.Departing Sat, 27 Mar, returning Sun, 4 Apr.Return flight with jetBlue and KLM.Outbound indirect flight with jetBlue, departs from Philadelphia International on Sat, 27 Mar, arriving in London Heathrow.Inbound indirect flight with KLM, departs from London Heathrow on Sun, 4 Apr, arriving in Philadelphia International.Price includes taxes and charges.From 741 €, select.

London.748 € per passenger.Departing Tue, 8 Dec, returning Wed, 13 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from Philadelphia International on Tue, 8 Dec, arriving in London Heathrow.Inbound indirect flight with Delta, departs from London Heathrow on Wed, 13 Jan, arriving in Philadelphia International.Price includes taxes and charges.From 748 €, select.

London.754 € per passenger.Departing Mon, 15 Feb, returning Fri, 19 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from Philadelphia International on Mon, 15 Feb, arriving in London Heathrow.Inbound indirect flight with Delta, departs from London Heathrow on Fri, 19 Feb, arriving in Philadelphia International.Price includes taxes and charges.From 754 €, select.

London.758 € per passenger.Departing Mon, 5 Oct, returning Thu, 8 Oct.Return flight with Iberia.Outbound direct flight with Iberia departs from Philadelphia International on Mon, 5 Oct, arriving in London Heathrow.Inbound direct flight with Iberia departs from London Heathrow on Thu, 8 Oct, arriving in Philadelphia International.Price includes taxes and charges.From 758 €, select.

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

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

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Direct flights from Philadelphia International to London Heathrow

Philadelphia International to London Heathrow: Alternative routes

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

Philadelphia to London: Flight information

The things to know before you go.

Cheapest flight found	591 €
Cheapest month to fly	October
Average flight time	7 hrs, 10 mins
Most popular airline	Finnair
Average flights per week	150

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

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

The best price we found for a return flight from Philadelphia International to London Heathrow is 591 €. 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 Philadelphia International to London Heathrow?

7 hours and 10 minutes is the average flight time from Philadelphia International to London Heathrow.

Which airlines fly direct from Philadelphia International to London Heathrow?

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

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

As of September 2026, there are 193 flights per week flying from Philadelphia International to London Heathrow.

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

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

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

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Philadelphia International Airport to London Heathrow Airport on Sunday, 25 October 2026.

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

Yes – the average flight time is 7 hours and 10 minutes.

How can I find the best flight deal to London Heathrow?

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 London Heathrow 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 London?

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

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

Currently, Aer Lingus and Iberia offer the cheapest flight tickets to London Heathrow.

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

The average time for a direct flight from Philadelphia International Airport to London Heathrow Airport is 7 hours 5 minutes.
London is five hours ahead of Philadelphia and follows the UTC+0 timezone.
Flights from PHL to LHR start at 18:30 — the first with British Airways. The latest departure is at 23:20 with American Airlines. Overall, you can take your pick of 18 weekly Philadelphia International Airport to London Heathrow Airport flights.
Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules to live by. Make sure you're at the airport on time to catch your PHL to LHR flight.
You'll likely experience longer lines during popular months such as August. Arriving up to four hours in advance for an international flight and two hours for a domestic departure will help ensure a smooth travel experience.
American Airlines has direct flights from Philadelphia International Airport to London Heathrow Airport. Book with this popular carrier, then get ready to see the sights in London — and maybe even more of the United Kingdom if you have time.
The airline that passengers book most often on this route is American Airlines.
American Airlines is the most punctual carrier that operates PHL to LHR flights. An exceptional 86.82% of its departures on this route arrive on time.
Think about adding a stopover when booking your ticket from Philadelphia International Airport to London Heathrow Airport. Simply deselect 'Direct flights only' to break up your trip, or perhaps explore a new destination along the way. Here are some options between PHL and LHR:
- New York Newark Airport
- Boston Logan International Airport
- Dublin Airport

How to find the cheapest flights from Philadelphia International Airport (PHL) to London Heathrow Airport (LHR)

The lowest price we've seen for a one-way Philadelphia International Airport to London Heathrow Airport flight is 213 €. A round-trip plane ticket is currently 591 €. Depending on the availability when you book, these fares could change.
Get cheap tickets from PHL to LHR by booking two months ahead. Based on our research, that's the sweet spot for picking up a bargain.
The cheapest month for flights from Philadelphia International Airport to London Heathrow Airport is July. Use the 'Whole month' tool to find the lowest airfares if you have flexible dates.
You don't need to check every day to find out if fares have dropped when you set up a Price Alert. We'll notify you the moment a special offer becomes available on cheap flights from PHL to LHR.
Discover the right flight for you with the help of the filters. To see the 'Fastest,' 'Best' or 'Cheapest' flights from Philadelphia International Airport to London Heathrow Airport, use the 'Sort by' function. You can also filter by departure and arrival times, airline, and number of stops.

Handy information about Philadelphia International Airport (PHL)

You'll find PHL at 8500 Essington Ave.
Of all flights departing from Philadelphia International Airport, 77% land on schedule at their destination.
To get to Philadelphia International Airport from central Philadelphia, it'll take around 20 minutes by car. This depends on traffic though. It's approximately 18 kilometres from the airport to the city centre.
You can expect a trip time of roughly 30 minutes when using public transport.
Get your break off to a relaxed start by staying near PHL. Whether you've booked an early flight from Philadelphia International Airport to London Heathrow Airport or just don't want to be rushed, these hotels are the answer:

Arriving at London Heathrow Airport (LHR)

Book a hotel near LHR if you're catching a late Philadelphia International Airport to London Heathrow Airport flight. Settle into one of these accommodation options and skip the long transfer:
Travel at your own speed with a London Heathrow Airport rental car. Pick up a set of wheels from Surprice, U-Save or Green Motion and find adventure across London and beyond.
Lock in the best deal by reserving your ride from London Heathrow Airport around one week ahead of your trip.

Getting from London Heathrow Airport (LHR) to central London

London Heathrow Airport is approximately 24 kilometres from central London. The drive time takes about 45 minutes.
If you're taking public transport, expect a journey of roughly 25 minutes.

When to fly to London Heathrow Airport (LHR)

July is the busiest month for flights from Philadelphia International Airport to London Heathrow Airport. For a quieter experience, go to London in March.
When booking your flight from Philadelphia International Airport to London Heathrow Airport, consider the type of weather you like. July is the warmest month in London, with the temperature ranging from 11ºC (52ºF) to 26ºC (79ºF).
January sees average temperatures of between 0ºC (32ºF) and 9ºC (48ºF). Look for cheap tickets from PHL to LHR sometime around then if you want to travel in cooler conditions.

Explore more of the United Kingdom

London is always a good idea, but there are so many other parts of the United Kingdom you should also see. About 257 kilometres north-west of London, a trip to Manchester will keep you on the move. Check out popular attractions like Manchester United Museum & Stadium Tour, The Homes of Football and Museum of Science and Industry.
If you're eager to discover another great destination in the United Kingdom, consider Birmingham, roughly 161 kilometres north-west of London. Birmingham Museum & Art Gallery, Birmingham Hippodrome Theatre and Bournville Experience are among its highlights.