479 € Cheap Flights from Philadelphia to London Heathrow

Compare Philadelphia to London Heathrow flight deals

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

Book the best London Heathrow fare with no extra fees

Flight deals from Philadelphia to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Philadelphia to London Heathrow? Find the lowest prices on one-way and return tickets right here.

London.479 € per passenger.Departing Sun, 25 Jan, returning Tue, 3 Feb.Return flight with British Airways.Outbound indirect flight with British Airways, departs from Philadelphia International on Sun, 25 Jan, arriving in London Heathrow.Inbound indirect flight with British Airways, departs from London Heathrow on Tue, 3 Feb, arriving in Philadelphia International.Price includes taxes and charges.From 479 €, select.

London.483 € per passenger.Departing Tue, 24 Feb, returning Wed, 11 Mar.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Philadelphia International on Tue, 24 Feb, arriving in London Heathrow.Inbound indirect flight with Iberia, departs from London Heathrow on Wed, 11 Mar, arriving in Philadelphia International.Price includes taxes and charges.From 483 €, select.

London.483 € per passenger.Departing Tue, 3 Feb, returning Fri, 13 Feb.Return flight with British Airways.Outbound indirect flight with British Airways, departs from Philadelphia International on Tue, 3 Feb, arriving in London Heathrow.Inbound indirect flight with British Airways, departs from London Heathrow on Fri, 13 Feb, arriving in Philadelphia International.Price includes taxes and charges.From 483 €, select.

London.483 € per passenger.Departing Wed, 18 Mar, returning Tue, 24 Mar.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Philadelphia International on Wed, 18 Mar, arriving in London Heathrow.Inbound indirect flight with Iberia, departs from London Heathrow on Tue, 24 Mar, arriving in Philadelphia International.Price includes taxes and charges.From 483 €, select.

London.497 € per passenger.Departing Wed, 15 Apr, returning Wed, 22 Apr.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Philadelphia International on Wed, 15 Apr, arriving in London Heathrow.Inbound indirect flight with Iberia, departs from London Heathrow on Wed, 22 Apr, arriving in Philadelphia International.Price includes taxes and charges.From 497 €, select.

London.497 € per passenger.Departing Wed, 28 Oct, returning Wed, 4 Nov.Return flight with Finnair and British Airways.Outbound indirect flight with Finnair, departs from Philadelphia International on Wed, 28 Oct, arriving in London Heathrow.Inbound indirect flight with British Airways, departs from London Heathrow on Wed, 4 Nov, arriving in Philadelphia International.Price includes taxes and charges.From 497 €, select.

London.498 € per passenger.Departing Tue, 18 Aug, returning Thu, 27 Aug.Return flight with British Airways.Outbound indirect flight with British Airways, departs from Philadelphia International on Tue, 18 Aug, arriving in London Heathrow.Inbound indirect flight with British Airways, departs from London Heathrow on Thu, 27 Aug, arriving in Philadelphia International.Price includes taxes and charges.From 498 €, select.

London.498 € per passenger.Departing Tue, 18 Aug, returning Thu, 10 Dec.Return flight with Iberia.Outbound indirect flight with Iberia, departs from Philadelphia International on Tue, 18 Aug, arriving in London Heathrow.Inbound indirect flight with Iberia, departs from London Heathrow on Thu, 10 Dec, arriving in Philadelphia International.Price includes taxes and charges.From 498 €, select.

Find the cheapest month to fly from Philadelphia to London Heathrow

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

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from Philadelphia to London Heathrow

Philadelphia to London Heathrow: Alternative routes

Compare routes from Philadelphia 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	479 €
Cheapest month to fly	January
Average flight time	7 hrs, 7 mins
Most popular airline	Iberia
Average flights per week	210

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

How much are return flights from Philadelphia to London Heathrow?

The best price we found for a return flight from Philadelphia to London Heathrow is 479 €. 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 to London Heathrow?

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

Which airlines fly direct from Philadelphia to London Heathrow?

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

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

As of January 2026, there are 210 flights per week flying from Philadelphia to London Heathrow.

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

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

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

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

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

Yes – the average flight time is 7 hours and 7 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 to London Heathrow with?

The cheapest airline that flies to London Heathrow is British Airways .

Flying from Philadelphia to London Heathrow Airport (LHR): What you need to know

Philadelphia's main base, Philadelphia International Airport (PHL), is where great travel stories take off. Explore the departure options from here when planning your flight from Philadelphia to London Heathrow Airport (LHR).
Expect to be travelling for 7 hours 5 minutes. That's the average duration of a direct Philadelphia to London Heathrow Airport flight.
London Heathrow Airport is located in London. The city is in the UTC+0 timezone and is four hours ahead of Philadelphia.
With 18 direct flights a week between the two airports, Philadelphia International Airport (PHL) to London Heathrow Airport (LHR) is the busiest route. British Airways operates the earliest flight at 6:30pm. If you prefer to make the most of your day before jetting off, the latest flight from PHL to LHR is with American Airlines at 11:20pm.
Get to the airport on time so you don't miss your flight from Philadelphia to LHR. Be there at least two hours ahead for international flights and an hour early for domestic departures to skip the mad dash to your gate.
Peak travel periods mean busier airports, so plan to arrive even earlier. Give yourself at least two hours before a domestic flight and four hours for an international journey to keep to your schedule.

Airports in Philadelphia

Philadelphia International Airport (PHL)

Enjoy an uninterrupted journey from Philadelphia International Airport (PHL). Direct flights from Philadelphia to London Heathrow Airport (LHR) can be booked from here.
American Airlines is a leading airline that operates direct flights from Philadelphia to London Heathrow Airport jetting out of PHL.
American Airlines sees the most traveller bookings for flights from PHL to LHR.
With 70.83% of its services landing as planned, American Airlines is the top performer for punctuality on this route.
A stopover is the ideal opportunity to break up your journey and maybe even visit a new city. When searching for cheap flights from Philadelphia to LHR leaving from Philadelphia International Airport (PHL), deselect the 'Direct flights only' box to discover where you can stop along the way. Some popular options include:
- Newark Liberty International Airport (EWR)
- Logan International Airport (BOS)
- Dublin Airport (DUB)
PHL is about 19 kilometres from central Philadelphia. If you're ride-sharing, driving or catching a cab from the centre, it'll take you 15 minutes or so to get there, depending on traffic. If you're using public transport, expect the journey time to be around 45 minutes.
Have an early flight from Philadelphia to London Heathrow Airport? Avoid the stress of rushing to the terminal (and enjoy a few extra z's) by staying at one of these hotels near Philadelphia International Airport:
78.93% of flights that take off from Philadelphia International Airport make it to their destination on schedule.
You'll find PHL at 8500 Essington Ave.

Trenton-Mercer Airport (TTN)

TTN is around 56 kilometres from central Philadelphia. It'll take 40 minutes or so to get to the airport if you're driving from the city centre. Public transport takes approximately 1 hour 45 minutes.
Want to enjoy an extra night away before boarding your Philadelphia to LHR flight? Check in to a hotel near Trenton-Mercer Airport before your trip officially begins. Here's where you can stay:
Flights from Trenton-Mercer Airport have a strong track record for punctuality, with 82.45% of them landing right on cue.
You'll find TTN at Scotch Road, Terminal Building.

About London Heathrow Airport (LHR)

The last thing you want is a lengthy journey to your hotel if you're arriving on a late flight from Philadelphia to London Heathrow Airport. Check in to one of these accommodation options near LHR instead:
Get your adventure underway by picking up a London Heathrow Airport rental car. Grab a set of wheels from Surprice, U-Save or Green Motion and explore beyond London's main sights.
Secure the lowest price by booking your ride around one week before your Philadelphia to London Heathrow Airport flight.

Getting from London Heathrow Airport (LHR) to central London

The centre of London is roughly 26 kilometres from London Heathrow Airport. Travel times by car hire or cab will vary depending on traffic conditions, so do a little research ahead of your trip.
It'll take around 1 hour if you're using public transport.

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

Right now, 220 € is the lowest price we've found for a one-way ticket from Philadelphia to London Heathrow Airport. The cheapest price for a return flight is 479 €. Remember fares can change due to availability at the time of booking.
To snap up cheap flights from Philadelphia to LHR, book your plane ticket two months before your planned departure.
The best month for landing cheap Philadelphia to London Heathrow Airport tickets is July. Use the 'Whole month' tool to compare prices, then select the dates that offer the biggest savings.
Save time searching for cheap plane tickets from Philadelphia to LHR by creating a Price Alert. We'll send you an email or notification on the app when fares go down.
Filters make it easier to find a bargain for your flight from Philadelphia to London Heathrow Airport. Pick the departure times, carriers and stops that make sense for you. Then sort the results by 'Cheapest' to find the best price quickly.

The best time to fly from Philadelphia to London Heathrow Airport (LHR)

It's time to figure out your travel dates for your flight from Philadelphia to London Heathrow Airport (LHR). July is the busiest month to visit London. If you prefer a quieter vibe, head there in February.
When booking your Philadelphia to LHR plane ticket, consider what kind of weather you prefer. July is the warmest month in London, with temperatures ranging from 11ºC (52ºF) to 26ºC (79ºF).
If you like cooler conditions, search for a cheap ticket from Philadelphia to London Heathrow Airport in January when temperatures are between 0ºC (32ºF) and 9ºC (48ºF).

More about London

When it comes to looking for somewhere to rest your head, you'll find the top stays in London right here. Explore these hotels after locking in your flight from Philadelphia to London Heathrow Airport:
You'll find plenty of awesome things to do in London when you're in the mood to sightsee. Kick things off at The British Museum followed by Westminster Abbey and Big Ben.

Explore more of the United Kingdom

You've seen London, now it's time to explore other parts of the United Kingdom. Travel about 153 kilometres north-west to Birmingham to check off its must-visit sights. From The Windsor Castle to Birmingham Museum & Art Gallery and Birmingham Hippodrome Theatre, you've got a jam-packed schedule ahead.
Around 145 kilometres west of London, Bristol is another favourite stop in the United Kingdom. Start your sightseeing at Banksey, Banksy's You Don't Need Planning Permission to Build Castles in the Sky and Clifton Suspension Bridge.