PHL - LHR

£248 Find Cheap Flights from Philadelphia to London Heathrow Airport

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 24/8. 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

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to London, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest return fare
£578
Typical prices: £558-£440
British Airways
Sat 19/9Tue 22/9
PHL - LHR • 1 stop
Cheapest direct flights
£664
Typical prices: £602-£433
British Airways
Wed 19/8Wed 2/9
PHL - LHR • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
BA's premium economy offers extra legroom for comfort.
Eat well before boarding if you're a picky eater.
Expert advice
Expert advice
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Expert advice
Expert advice
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Top airlines
Cheapest • from £578 (return)
Best reviews • 7.3 score
Airline reviews
Airline reviews
+1
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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 18m
Direct flights
Direct flights
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Direct flights
Direct flights
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When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 50% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 23% price drop
Most popular
Good to know
Good to know
+1
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Good to know
Good to know
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Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Flight Deals
Booking Insights
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

Sat, 19 Sep - Tue, 22 Sep
British Airways Logo
19:35 - 07:05
PHL
-
LHR
30h 30m
1 stop
British Airways Logo
06:15 - 17:40
LHR
-
PHL
16h 25m
1 stop
£578British Airways
Tue, 2 Jun - Tue, 9 Jun
Aer Lingus Logo
20:25 - 12:40
PHL
-
LHR
11h 15m
1 stop
Aer Lingus Logo
13:25 - 18:55
LHR
-
PHL
10h 30m
1 stop
£599Aer Lingus
Tue, 6 Oct - Fri, 9 Oct
British Airways Logo
22:20 - 07:10
PHL
-
LHR
27h 50m
1 stop
British Airways Logo
06:15 - 17:50
LHR
-
PHL
16h 35m
1 stop
£618British Airways
Sat, 13 Jun - Wed, 17 Jun
Aer Lingus Logo
20:25 - 13:30
PHL
-
LHR
12h 05m
1 stop
Aer Lingus Logo
13:25 - 18:55
LHR
-
PHL
10h 30m
1 stop
£622Aer Lingus
Tue, 29 Sep - Tue, 13 Oct
Scandinavian Airlines Logo
13:20 - 18:30
PHL
-
LHR
24h 10m
2 stops
Scandinavian Airlines Logo
17:00 - 22:38
LHR
-
PHL
34h 38m
2 stops
£631Scandinavian Airlines
Wed, 14 Oct - Wed, 21 Oct
Scandinavian Airlines Logo
09:40 - 09:20
PHL
-
LHR
18h 40m
2 stops
Scandinavian Airlines Logo
06:40 - 20:07
LHR
-
PHL
18h 27m
2 stops
£638Scandinavian Airlines
Wed, 23 Sep - Tue, 29 Sep
Aer Lingus Logo
20:25 - 11:10
PHL
-
LHR
9h 45m
1 stop
Aer Lingus Logo
12:00 - 18:55
LHR
-
PHL
11h 55m
1 stop
£641Aer Lingus
Sun, 6 Sep - Mon, 21 Sep
Multiple Airlines Logo
20:25 - 11:10
PHL
-
LHR
9h 45m
1 stop
Multiple Airlines Logo
06:50 - 22:46
LHR
-
PHL
20h 56m
2 stops
£643Multiple Airlines
Sat, 19 Sep - Mon, 21 Sep
British Airways Logo
13:55 - 07:50
PHL
-
LHR
12h 55m
1 stop
British Airways Logo
07:50 - 17:40
LHR
-
PHL
14h 50m
1 stop
£644British Airways
Mon, 4 May - Fri, 8 May
JetBlue Logo
06:00 - 06:30
PHL
-
LHR
19h 30m
1 stop
JetBlue Logo
08:40 - 17:38
LHR
-
PHL
13h 58m
1 stop
£647JetBlue
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 September.

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 Tuesday 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 September, where tickets cost £483 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is £951 and £852 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.

No, with an average price for the route of £682, prices are generally cheapest when you fly direct.

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 3 weeks before departure, which saves you about 50% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 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£248
Best time to beat the crowds (15% less expensive on average)
Most popular time to fly and prices are also 24% 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 3 days, the lowest price for a flight from Philadelphia to London Heathrow Airport was £248 for a one-way ticket and £578 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: British Airways, Iberia, Finnair, American Airlines, Aer Lingus, SWISS, KLM, Air France, Delta, and Malaysia Airlines.

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

    The Airbus A350-1000 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, Aer Lingus or JetBlue?

    The two airlines most popular with KAYAK users for flights from Philadelphia to London are Aer Lingus and JetBlue. With an average price for the route of £516 and an overall rating of 7.3, Aer Lingus is the most popular choice. JetBlue is also a great choice for the route, with an average price of £557 and an overall rating of 7.2.

  • 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 £419 or less one-way and £682 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 4 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.
7.3
Aer LingusOverall score based on 1524 reviews
8.1Crew
7.2Comfort
7.4Boarding
7.0Entertainment
6.6Food
Airline reviews

Late late late. Delayed and arrived an hour late for a 1 hour 45 minute connection. Every time. Poor record for this company. I try to fly any other carrier first.

2.0 MediocreJason, Apr 2026
ORD - TYS
Read more Aer Lingus reviews

Late late late. Delayed and arrived an hour late for a 1 hour 45 minute connection. Every time. Poor record for this company. I try to fly any other carrier first.

This was the smoothest flight I've ever taken with any airline, including Aer Lingus. Typically, there are moments when I feel afraid, but from take off (miraculously seamless!) to cruise, to landing this was a perfect flight. Thank you!

Poor. Plane left EWR late hence missed connecting flight in Dublin. No pro active info from flight staff on connection, only when probed a couple of lies on where we would dock, and on lilelyhood catching connecting flight. Lies as they will have known our EWR-DUB would be parked furthest away from the transit spit - lying it would be next to the AMS flight.

The crew was friendly. The plane was comfortable. In-flight wifi didn't work well at all. The ride was quite turbulent but understandable given the weather.

I flew economy class. Seats were very good and the crew was excellent

There was a 6h delay with limited updates . When we got to Manchester the bus took ages to get to arrivals and we missed our train, dinner reservation. Basically lost a whole day due to arrivals Lingus!!

Great. Has a problem with DOB. Fixed 4 us. Led to a 5 hour earlier flight to London!

Punctual, smooth flight. Crew excellent and cabin very clean. Paid for WiFi but once you close out you cannot get back in even if you paid for entire flight.

Flight crew was superb. Meal was one of the meals at altitude I’ve had

Canceled my flight couple hours before takeoff. They could not find a decent re-routing and refused to pay for when i subjected alternative with Lufthansa.

Crew was very friendly. Did not like being jammed in the back middle seat. Don’t understand why I can not select an aisle for free based on first come first serve. Also first time I’ve been on a flight which attempted land then circled Detroit airport multiple times.

Terrible. There was a lot of misleading information regarding ticketing, seat upgrades, & boarding group. I also expect my seat will recline. I have back problems & it is very painful for me of the seat doesn’t recline. In addition, when I choose a fare that allows me a carry-on bag, I expect to be able to carry it on. Not be forced to check it. Thos happened on my flight to MCO & back to Boston. Not sure I will ever fly JetBlue again. Further I bought the ticket through hat deal. I will NEVER do that again. They were incapable of providing an accurate record locator # for either leg of the trip. I had to call them before each flight with me VERY stressed about whether I would actually be able to get on my flight. Who does that? Who books flight & then FAILS to give an accurate record locator? Twice!

The flight was delayed 4 hours and the JetBlue people at the counter kept lying to us and telling us it was due to weather however all other flights were going in and out of NY and FL. Then they lied that the plane had to stop to refuel. Then they lied and said the plane needed a tire change. JetBlue is the worst. Then they gave a lot of people meal vouchers however I didn’t know they did that and they didn’t offer anything to me.

My experience with Jet Blue was wonderful. My experience with Kayak sucked and will never use again.

Jet Blue has excellent everything, Friendly customer service and staff, clean aircraft’s and is always on time.

Entertainment and wifi were very sub-par - audio issues and no wifi

We were delayed and had to circle due to weather and had to divert for fuel. While I understand that you can’t control the weather I would have appreciated knowing that the crew wasn’t going to run out of hours and then having to spend the night in the Raleigh airport.

Messy plane that was falling apart Small screens that didn't work

I was traveling with two small kids and our TV s were the only ones not working. Informed the flight attendant who did nothing about them.

They forced me to check my hand luggage at the gate.

The business class layout of chairs was weired. You are sitting directly across stranger.,

We did not have enough time to make our connecting flight. As a result, we were put onto a different airline for our second leg. The different airline was NOT comparable to British Airlines, and our arrival was significantly delayed. The actual flight on BA was amazing.

Tv screens and movie selection v good. Friendly staff. They were really worried about max capacity and room for carryons. That is never fun but i had no problem finding space when I boarded.

British Airways is an excellent travel service. Comfort, food and airline personnel.

Good level of service. Comfortable airplane. However, security is always a hassle at LHR. I always try to avoid that airport at all cost if possible.

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

Disliked having to wait a little longer to disembark from the plan when we landed in London

Food should be better quality. Video screens have poor resolution and the library of movies is poor. The other airlines are much better.

The trip was smooth but the crew were very abrupt, snatching things before finished and being quite snappy when asked questions.

My wife and I love to travel, so we fly a lot. We've already logged 381,075 miles and with practically every major airline. But this flight was very disappointing. It started off well, with no delays and a new plane. But when lunchtime approached, all that good impression was ruined. Instead of white tablecloths, we were offered small, dark placemats, which, as it turned out, were perfectly adequate for the food. All the food offered—and my wife and I only took fish, and the meat—was not just bad, it was downright disgusting and not heated enough. The same applies to the appetizers. This was the first time in many years of traveling that we've been offered such disgusting food.

Flight delayed, connection was not at gate listed and so missed, staff were rude at Heathrow, phone tree stupid and difficult, took me 21 actual hours to reach my destination. Almost lost my hotel reservation after walking in a strange city alone after midnight because they would not put me up in a hotel at sfo or heathrow. I will never fly BA again and will tell all people and Instagram followers never to fly BA.

Overall ok. Best part has always been the sundae dessert.

I’ve never been on a trans-Atlantic (or Pacific) flight where the seats don’t recline—not even a little. I asked my seat mate when BA starting doing this and he said “Oh, a few years ago.” I couldn’t sleep, with my head falling forward waking me continuously, and came off the plane incredibly stiff. I booked a Premium Economy seat to get a more comfortable seat, which was worse than most basic Economy seats I’ve ever booked.

Nice aircraft. Good crew. Delayed departure from Houston, but arrived on time in London. Main thing I don’t like about flying BA is having to transit through security in London Heathrow. A major pain!

The gate agent made me check my carry-on in Denver, even though I've traveled all over taking this case on the plane. Beware folks. Food in Premium Economy was quite good - excellent blanket! Flight attendants on the Heathrow-to-Budapest flight on 3-27-2026 were quite snappy. I got a frown when asked to unscrew the water bottle cap for me (I had a cast on my right arm). Also woke up right when they were handing out biscuits. She had given my rowmates one and was in the process of giving water when I asked for a biscuit. She scolded me and said, "You snooze, you lose". She did give me one, but I thought that comment was uncalled for.

Wish the food and overall service was better. They treat Business class passengers same as economy

WiFi wasn’t available to economy until the end of the flight.

Very good staff members with sincere passion and responsibility in their job.

Very please with the seating that the Kayak staff booked for us!

Worth every penny to upgrade to BC. Treated and felt more like First Class

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

Information on your arrival and departure airports