PHL - LHR

£206 Find Cheap Flights from Philadelphia to London Heathrow Airport – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Heathrow departing on 6/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest return fare
£652
Typical prices: £421-£735
British Airways
Sun 18/10Wed 21/10
PHL - LHR • 1 stop
Cheapest direct flights
£677
Typical prices: £422-£765
British Airways
Sun 18/10Wed 21/10
PHL - LHR • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
On British Airways, allow 2 hours at Heathrow; delays can affect onward plans.
On American Airlines, keep clothes in your carry-on, not only gate-check bags.
Expert advice
Expert advice
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Expert advice
Expert advice
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Top airlines
Cheapest • from £652 (return)
Best reviews • 7.1 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Direct flights
You can fly direct with American Airlines and British Airways. Average duration is 7h 11m
Direct flights
Direct flights
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Direct flights
Direct flights
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Top stopover airports
Cheapest • Avg £568 (return)
Shortest trip • 9h 40m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 39% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 26% price drop
Most popular
Good to know
Good to know
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Philadelphia to Heathrow (PHL-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Philadelphia to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Philadelphia to Heathrow

Sun, 18 Oct - Wed, 21 Oct
British Airways Logo
15:35 - 10:30
PHL
-
LHR
13h 55m
1 stop
British Airways Logo
13:45 - 16:40
LHR
-
PHL
7h 55mdirect
£652British Airways
Wed, 7 Oct - Thu, 22 Oct
Multiple Airlines Logo
17:40 - 10:40
PHL
-
LHR
12h 00m
1 stop
Multiple Airlines Logo
19:25 - 18:55
LHR
-
PHL
28h 30m
2 stops
£657Multiple Airlines
Sun, 16 Aug - Wed, 19 Aug
JetBlue Logo
09:12 - 06:30
PHL
-
LHR
16h 18m
1 stop
JetBlue Logo
08:40 - 20:01
LHR
-
PHL
16h 21m
1 stop
£658JetBlue
Mon, 10 Aug - Wed, 19 Aug
JetBlue Logo
09:12 - 06:30
PHL
-
LHR
16h 18m
1 stop
JetBlue Logo
08:40 - 20:01
LHR
-
PHL
16h 21m
1 stop
£659JetBlue
Mon, 23 Nov - Mon, 30 Nov
Aer Lingus Logo
17:30 - 08:05
PHL
-
LHR
9h 35m
1 stop
Aer Lingus Logo
09:50 - 16:00
LHR
-
PHL
11h 10m
1 stop
£660Aer Lingus
Tue, 27 Oct - Tue, 3 Nov
British Airways Logo
20:50 - 07:50
PHL
-
LHR
7h 00mdirect
British Airways Logo
06:30 - 14:05
LHR
-
PHL
12h 35m
1 stop
£663British Airways
Wed, 7 Oct - Thu, 15 Oct
British Airways Logo
08:34 - 06:15
PHL
-
LHR
16h 41m
1 stop
British Airways Logo
13:00 - 16:00
LHR
-
PHL
8h 00mdirect
£663British Airways
Sat, 1 Aug - Sat, 22 Aug
JetBlue Logo
20:55 - 06:30
PHL
-
LHR
28h 35m
1 stop
JetBlue Logo
08:40 - 08:22
LHR
-
PHL
28h 42m
1 stop
£665JetBlue
Sun, 16 Aug - Fri, 21 Aug
JetBlue Logo
09:12 - 06:30
PHL
-
LHR
16h 18m
1 stop
JetBlue Logo
08:40 - 20:01
LHR
-
PHL
16h 21m
1 stop
£666JetBlue
Mon, 12 Oct - Sat, 31 Oct
JetBlue Logo
15:25 - 06:30
PHL
-
LHR
10h 05m
1 stop
JetBlue Logo
09:20 - 17:32
LHR
-
PHL
12h 12m
1 stop
£666JetBlue
Booking Insights

KAYAK’s insights & trends for Philadelphia to Heathrow flights

Get data-powered insights and trends into flights from Philadelphia to Heathrow to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from Philadelphia to London Heathrow Airport?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from Philadelphia to London Heathrow Airport departing in October.

What’s the cheapest day of the week to fly from Philadelphia to London Heathrow Airport?

The average price of all round-trip flights from Philadelphia to London Heathrow Airport clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to London Heathrow Airport on a Saturday and more expensive on a Sunday. On your return trip to Philadelphia, you should consider flying back on a Tuesday, and avoid Sundays for better deals.

What is the cheapest month to fly from Philadelphia to London Heathrow Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Philadelphia to London Heathrow Airport is August, where tickets cost £505 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £1,106 and £952 respectively.

Can I save money by flying with a stopover from Philadelphia to London Heathrow Airport?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 2 stops stopover the cheapest option at £773 on average.

How far in advance should I book a flight from Philadelphia to London Heathrow Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Philadelphia to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Philadelphia to London Heathrow Airport, you should book around 2 weeks before departure, which saves you about 39% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Expert advice

Expert advice for your flight from Philadelphia to Heathrow

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on Finnair

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialising in airline interiors and regulations. 10 years ago, she pivoted to journalism. She shares her insights in leading aviation, travel and business publications and on her site, FlightChic.

Duncan Madden

Duncan Madden

Expert on British Airways

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Good to know - Cheap tickets from Philadelphia to London Heathrow Airport

Low seasonJanuary
Cheapest flight£206
Best time to beat the crowds (20% less expensive on average)
Most popular time to fly and prices are also 25% lower on average.
Flight from Philadelphia to London Heathrow Airport

When to book flights from Philadelphia to Heathrow

Are your dates flexible? Find out the best times to travel from Philadelphia to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Philadelphia to Heathrow: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Philadelphia to Heathrow 
LisaFlew with British Airways
PHL
-
LHR
May 2025
Make sure you have enough time in London if you have a transfer flight. I would recommend at least 2 hours.
RadicalFlew with American Airlines
PHL
-
LHR
May 2025
Don’t put everything in your gate check bags. Make sure you have clothes in your carry on
Verified travelerFlew with British Airways
PHL
-
LHR
Oct 2024
Eat well before boarding if you’re a picky eater.
GlennFlew with British Airways
PHL
-
LHR
Jun 2024
British airways could have many delays, ensure there's enough time for the layover

FAQs for booking Philadelphia to London Heathrow Airport flights

  • What is the cheapest flight from Philadelphia to London Heathrow Airport?

    In the last 5 days, the lowest price for a flight from Philadelphia to London Heathrow Airport was £206 for a one-way ticket and £652 for a return.

  • Which airlines offer Wi-Fi service onboard planes from Philadelphia to London Heathrow Airport?

    All the following airlines offer inflight Wi-Fi service on the Philadelphia to London Heathrow Airport flight route: Iberia, Finnair, British Airways, American Airlines, Air France, Delta, KLM, and Malaysia Airlines.

  • Which aircraft models fly most regularly from Philadelphia to London Heathrow Airport?

    The Boeing 787-9 Dreamliner is the aircraft model that flies most regularly on the Philadelphia to London Heathrow Airport flight route.

  • Which airline alliances offer flights from Philadelphia to London Heathrow Airport?

    oneworld is the only airline alliance operating flights between Philadelphia and London Heathrow Airport.

  • On which days can I fly direct from Philadelphia to London Heathrow Airport?

    There are direct flights from Philadelphia to London Heathrow Airport on a daily basis.

  • Which is the best airline for flights from Philadelphia to London, American Airlines or British Airways?

    The two airlines most popular with KAYAK users for flights from Philadelphia to London are American Airlines and British Airways. With an average price for the route of £664 and an overall rating of 7.1, American Airlines is the most popular choice. British Airways is also a great choice for the route, with an average price of £667 and an overall rating of 6.7.

  • How does KAYAK find such low prices on flights from Philadelphia to London Heathrow Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to London Heathrow Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to London Heathrow Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Philadelphia is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to London Heathrow Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Philadelphia with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to London Heathrow Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Philadelphia to London Heathrow Airport

  • Looking for a cheap flight from London Heathrow Airport to Philadelphia? 25% of our users found flights on this route for £245 or less one-way and £824 or less round-trip.

Prefer to fly direct from Philadelphia to London Heathrow Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Philadelphia to London Heathrow.
Find which airlines fly direct from Philadelphia Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Philadelphia to London Heathrow

Monday

American Airlines,British Airways

American Airlines,British Airways

Tuesday

American Airlines,British Airways

American Airlines,British Airways

Wednesday

American Airlines,British Airways

American Airlines,British Airways

Thursday

American Airlines,British Airways

American Airlines,British Airways

Friday

American Airlines,British Airways

American Airlines,British Airways

Saturday

American Airlines,British Airways

American Airlines,British Airways

Sunday

American Airlines,British Airways

American Airlines,British Airways

See more direct flights

Direct returns

London Heathrow to Philadelphia

Monday

American Airlines,British Airways

American Airlines,British Airways

Tuesday

American Airlines,British Airways

American Airlines,British Airways

Wednesday

American Airlines,British Airways

American Airlines,British Airways

Thursday

American Airlines,British Airways

American Airlines,British Airways

Friday

American Airlines,British Airways

American Airlines,British Airways

Saturday

American Airlines,British Airways

American Airlines,British Airways

Sunday

American Airlines,British Airways

American Airlines,British Airways

See more direct flights

Reviews of the top airlines flying from Philadelphia to Heathrow

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11807 reviews
7.9Crew
6.4Food
6.8Entertainment
7.2Comfort
7.5Boarding
Airline reviews

Comfort in premium economy is worth it for long hauls especially on the 787-9P Dreamliner with the modern updates. The food was okay. All 4 of us selected the same meal, 2 of us had very dry hard to cut chicken, the other 2 were tender and good. The sides/salad/dessert all very good as far as airline food goes. Crew were very attentive. Will be hard to ever go back to regular economy!

10.0 ExcellentNick, Jul 2026
DFW - LHR
Read more American Airlines reviews

Comfort in premium economy is worth it for long hauls especially on the 787-9P Dreamliner with the modern updates. The food was okay. All 4 of us selected the same meal, 2 of us had very dry hard to cut chicken, the other 2 were tender and good. The sides/salad/dessert all very good as far as airline food goes. Crew were very attentive. Will be hard to ever go back to regular economy!

Crew was great! Food sub-bar, tepid & flavorless. No snack options on trans-atlantic flight. Premium Economy seats ok, leg rest wouldn’t stay in place.

Entertainment system did not function. USB ports did not function. Wi-Fi did not function. Terrible trifecta…

Luggage did not make it onto my plane. Business seats were economy with empty row seat. Just horrible experience. Why would the company allow for transfers that don’t give employees enough time to transfer luggages??

The check in agents in PHL and gate agents had to have been the rudest women that I have ever encountered; the agent weighing the bags at check in screamed continuously at all of the guests as did the woman at the gate.I have Executive Platinum status with AA and fly a lot with AA but these ladies were the absolute worst I had the displeasure to encounter!

My flight to London from Philadelphia was cancelled due to weather.

The flight was canceled 3 hours after original take off time

Again flight was awesome except British Airways lost both gate checked luggage’s. Still missing

Missed connection from Philadelphia to London because flight from DC was seriously delayed. Was re-routed the next day (had to pay for hotel) to Zurich and was given a main cabin middle seat while I had paid for premium. Great job AA!!!

So uncomfortable to sit in the tiny space on a long, international. Food was rough. Please, less white flour and processed food.

Boarding process was chaotic. Confusion over Boarding gates: gate 55 or gate 56 ???. Unnecessary standing in long lines to board. Better to call out Boarding groups one at a time and everyone else to sit. Airline only has 2 Boarding groups 1-3 and 4-9. That causes over crowding and chaos

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

I have always been pleased with their service. Would not change a thing

My flight was late. We stayed in aircraft one hour 😩

The seats (upgraded exit row), were the last comfortable plane seats my wife or I have ever experienced. Too narrow to turn at all to find a sleeping position. Devoid of cushioning to the point of feeling the frame bars across both the seat and the back. It was extremely uncomfortable and neither of us slept on the red eye.

We were on flight for 7 hrs and there was no WiFi. Not really easy to use any of our electronics. Def not ideal

Economy class has no legroom so if you have the money worth to upgrade! Food was absolutely horrible! The crew was super nice!!!!!

First time flying with BA and I will do it again. Staff at airport and on board were very nice and helpful

Overall, terrific service, accommodations, and experience. Only reason comfort was rated lower was because it was difficult to keep a comfortable sleeping position for the overnight flight, but I also had an economy seat.

Flight landed on time but there was a delay for over a half hour unloading us. I missed my connecting flight to Milan and had to wait 2 hours for the next flight. I was supposed to take a bus to Turin from there and do business with a bank. By the time I was able to get to Turin I arrived when the banks were closed and Friday was a religious holiday which they were closed. This ruined my whole point of the trip as I return to the USA tomorrow without getting buisness done. I also lost out on the money I paid for my original bus ticket and had to buy another.

Everything you need to know for your flight from Philadelphia to Heathrow

Information on your arrival and departure airports