LHR - PHL

£268 Find Cheap Flights from London Heathrow Airport to Philadelphia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Philadelphia departing on 25/2. 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 Philadelphia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Philadelphia.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Philadelphia.
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Everything you should know

Cheapest return fare
£421
Overall average: £478
American Airlines
Wed 11/2Wed 3/6
LHR - PHL • 1 stop
Cheapest direct flights
£444
Typical prices: £440-£561
Finnair
Wed 11/3Mon 23/3
LHR - PHL • Direct
Our travellers' advice
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
Finnair's Economy Comfort offers extra legroom.
Bring snacks and water; meals and drinks are limited.
Expert advice
Expert advice
+1
+1
Expert advice
Expert advice
+1
Top airlines
American Airlines
Cheapest • from £421 (return)
Finnair
Best reviews • 7.6 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 33% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
March
Cheapest • 15% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Philadelphia!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Heathrow to Philadelphia (LHR-PHL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Heathrow to Philadelphia 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 Heathrow to Philadelphia

Wed, 11 Feb - Wed, 3 Jun
American Airlines Logo
07:50 - 14:05
LHR
-
PHL
11h 15m
1 stop
American Airlines Logo
13:53 - 06:15
PHL
-
LHR
11h 22m
1 stop
£421American Airlines
Fri, 13 Mar - Fri, 20 Mar
United Airlines Logo
08:30 - 21:09
LHR
-
PHL
16h 39m
2 stops
United Airlines Logo
14:52 - 10:50
PHL
-
LHR
15h 58m
1 stop
£422United Airlines
Fri, 13 Mar - Fri, 20 Mar
United Airlines Logo
08:30 - 21:09
LHR
-
PHL
16h 39m
2 stops
United Airlines Logo
19:45 - 10:50
PHL
-
LHR
11h 05m
1 stop
£423United Airlines
Sat, 21 Feb - Sat, 7 Mar
Air Canada Logo
06:50 - 14:47
LHR
-
PHL
12h 57m
2 stops
Air Canada Logo
15:30 - 20:35
PHL
-
LHR
48h 05m
2 stops
£423Air Canada
Thu, 12 Feb - Thu, 26 Feb
Air Canada Logo
06:50 - 14:50
LHR
-
PHL
13h 00m
2 stops
Air Canada Logo
15:30 - 20:35
PHL
-
LHR
24h 05m
2 stops
£424Air Canada
Wed, 29 Apr - Tue, 12 May
British Airways Logo
08:50 - 14:55
LHR
-
PHL
11h 05m
1 stop
British Airways Logo
14:46 - 08:00
PHL
-
LHR
12h 14m
1 stop
£425British Airways
Wed, 11 Feb - Sun, 10 May
British Airways Logo
07:50 - 14:05
LHR
-
PHL
11h 15m
1 stop
British Airways Logo
22:00 - 18:55
PHL
-
LHR
15h 55m
1 stop
£426British Airways
Mon, 23 Feb - Sat, 7 Mar
Air Canada Logo
06:50 - 14:47
LHR
-
PHL
12h 57m
2 stops
Air Canada Logo
15:30 - 07:10
PHL
-
LHR
10h 40m
1 stop
£426Air Canada
Thu, 12 Feb - Sun, 22 Feb
United Airlines Logo
13:30 - 22:46
LHR
-
PHL
14h 16m
2 stops
United Airlines Logo
10:35 - 07:10
PHL
-
LHR
15h 35m
2 stops
£427United Airlines
Thu, 12 Feb - Thu, 26 Feb
Air Canada Logo
06:50 - 14:50
LHR
-
PHL
13h 00m
2 stops
Air Canada Logo
16:05 - 08:30
PHL
-
LHR
11h 25m
1 stop
£428Air Canada
Booking Insights

KAYAK's insights & trends for Heathrow to Philadelphia flights

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

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

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

When flying from London Heathrow Airport to Philadelphia, you should consider leaving on a Wednesday and avoid Sundays if you are looking for the best rates. For your return to London Heathrow Airport, you’ll find the best rates on Tuesdays and the most expensive ones on Sundays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to Philadelphia, 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 London Heathrow Airport to Philadelphia is March, where tickets cost £464 (return) on average. On the other hand, the most expensive months are August and December, where the average cost of round-trip tickets is £657 and £656 respectively.

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

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 £514 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to Philadelphia, 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 London Heathrow Airport to Philadelphia, you should book around 2 weeks before departure, which saves you about 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 2 weeks before departure.

Expert advice

Expert advice for your flight from Heathrow to Philadelphia

 
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
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.

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.

Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, The Points Guy, and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

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

Low seasonJanuary
Cheapest flight£268
Best time to beat the crowds (2% less expensive on average)
Most popular time to fly (17% more expensive on average)
Flight from London Heathrow Airport to Philadelphia

When to book flights from Heathrow to Philadelphia

Are your dates flexible? Find out the best times to travel from Heathrow to Philadelphia 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 Heathrow to Philadelphia: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Heathrow to Philadelphia 
Verified travelerFlew with American Airlines
LHR
-
PHL
Jul 2024
Make sure you are at the airport at least 3 hours early to ensure that you can check in, go through security, and so that you can find your departure gate within plenty of time so you are not rushing.
Anne KatherineFlew with Iberia
LHR
-
PHL
Jul 2024
Need more snacks. As meals not big and need more to eat Also take own water on board as not enough drinks offered from cabin crew - can feel dehydrated during flight

FAQs for booking London Heathrow Airport to Philadelphia flights

  • Which airline on this route is good for Unaccompanied Minor travel?

    Iberia is a great airline for Unaccompanied Minor travel services as they not only guide children between 5 and 11 years, which is mandatory, but they also extend the service to young flyers between 12 and 17 years. This offers great peace of mind for parents as children are collected at London Heathrow Airport (LHR), monitored during flights and stopovers and dropped off with the appropriate guardian at Philadelphia International Airport (PHL).

  • How can I guarantee a culturally-appropriate meal on my flight?

    If you book with Qatar Airways, you can guarantee a delicious, nutritious and appropriately-prepared religious meal when booked from the Special Meals Menu 24 hours ahead of flight time. This will include Kosher and Muslim meals as well as Jain and Hindu. You can also get the meals in vegan and vegetarian variations.

  • Do the airlines on this route allow service dogs to travel with their owners?

    You will have no hassle getting your service dog in the cabin with any of the airline carriers servicing this flight. However, the animal will need to be harnessed for the duration of the flight. You will also need to ensure you book it in at the same time as your ticket booking, provide a valid training certificate and a clean bill of health.

  • How do I book Mobility Assistance from my airline?

    Airlines will request that you book in your Mobility Assistance needs 48 hours before take-off by filling out a medical request form to help them prepare for your needs. British Airways arranges a pre-determined meeting spot in the airport, guides you through Security, boarding, and luggage or mobility devices storage. During the flight, there will be crew to assist with explanation of safety instructions, mobility to and from restrooms and assistance with food packaging. No airline will administer medication. 

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

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to Philadelphia was £268 for a one-way ticket and £421 for a return.

  • Which airports will I be using when flying from London Heathrow Airport to Philadelphia?

    When flying out of London Heathrow Airport you will be using London Heathrow. You will be landing at Philadelphia, also known as Philadelphia.

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

    American Airlines, Air France, KLM, Virgin Atlantic, and Delta offer inflight Wi-Fi service on the London Heathrow Airport to Philadelphia flight route.

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

    The Airbus A350-1000 is the aircraft model that flies most regularly on the London Heathrow Airport to Philadelphia flight route.

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

    Star Alliance, and oneworld are the airline alliances operating flights between London Heathrow Airport and Philadelphia, with Star Alliance being the most commonly used for this route.

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

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

  • Which is the best airline for flights from London to Philadelphia, Finnair or United Airlines?

    The two airlines most popular with KAYAK users for flights from London to Philadelphia are Finnair and United Airlines. With an average price for the route of £548 and an overall rating of 7.6, Finnair is the most popular choice. United Airlines is also a great choice for the route, with an average price of £418 and an overall rating of 7.4.

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

    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 London Heathrow Airport to Philadelphia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from London Heathrow Airport 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 London Heathrow Airport to Philadelphia?

    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 Philadelphia with an airline and back to London Heathrow Airport with another airline.

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

    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 Philadelphia from London Heathrow Airport 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 London Heathrow Airport to Philadelphia

  • Looking for a cheap flight from Philadelphia to London Heathrow Airport? 25% of our users found flights on this route for £395 or less one-way and £481 or less round-trip.
  • To get to London Heathrow Airport (LHR) with public transportation, you can find the Piccadilly tube line heads straight to the airport and stops at the tube stops based in Terminals 2, 3, 4 and 5. The airport is close to the city and a London cab will also be a convenient way to get there.
  • American Airlines frequently services this route at good prices. They are also the global leader in green aviation, making them a sustainable choice. They aggressively keep up with changing technology and are determined to net zero carbon by 2050.
  • Domestic pets under 6 kg can enjoy flying in the cabin alongside you as opposed to travelling in the hold if you book with British Airways. Ensure the pet is in a solid, waterproof container with good ventilation, has an inoculation record and a microchip.
  • If you're travelling to Philadelphia with a baby, most airlines will charge you just 10% of a normal air ticket price if the child is under 24 months and can travel on your lap during the flight. However, American Airlines does not charge for the baby at all.
  • When you land at Philadelphia International Airport (PHL), you will find the Regional Rail Airport Line train service. This train runs straight from all the airport terminals into the city centre, stopping in the centre as well as University City and Temple University.

Prefer to fly direct from London Heathrow Airport to Philadelphia?

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

Direct departures

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

Direct returns

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

Reviews of the top 5 airlines flying from Heathrow to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from London to Philadelphia. 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 Heathrow to Philadelphia? 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.
7.6
FinnairOverall score based on 1356 reviews
7.7Boarding
6.9Entertainment
6.7Food
7.5Comfort
8.2Crew
Airline reviews

Very good seat, very comfortable, good food, and good service.

10.0 ExcellentSunny, Jan 2026
HEL - DEL
Read more Finnair reviews

Very good seat, very comfortable, good food, and good service.

It was a good flight, very comfortable seats for sleeping in business class. Probably the most comfortable business class seat I've ever had (20+ times in business class on various airlines). Service was good, but the only downside is my screen didn't work and it had to be reset multiple times to get it to shut off. I had to block my eyes because the screen was white almost the entire flight and I wore an eye mask when I slept. But when eating and reading in my seat, my eyes hurt because the only way to turn the screen off was reset it and the screen would only be off for a few minutes at a time.

Everything was wonderful! AirBus seats are more comfortable to sleep in as compared to the Boeing planes.

All reviews good because...flight from BWI to London ,economy seats was miserable. I usually book 1,step up from economy but this would have added 1500 bucks 1 way. Bit the bullet and upgraded for retun flight, otherwise all ratings would have been rock bottom.

It was okay. The airplane was a little smaller than a flight from Thailand to Helsinki.

Wish that everyone would board the back of the plane first. Also let kids on first. The gate wasn’t open at arrival and we waited 45 minutes to takeoff. They made up for time in the air.

This was an absolutely exceptional flight. The flight attendants were extremely attentive and very friendly. They seemed to go out of their way to make us comfortable and to make sure that we had everything we needed., We were in business and were very happy with the size and the details for our pods. We would definitely recommend Finnair and will definitely be flying with them again.

We had an excellent trip with Finnair. This was our first time and we’re very pleased. The only issue was with the boarding - it was a little bit confusing and needs a little bit of streamlining.

Crew very lovely. Arrived an hour late due to bad weather. We were given new tickets to an other flight but it could have been organised better, so we did not have to run through the whole airport to.

Flight delayed over an hour. They said they would hold our connection but then did not.

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

This Japanese airline provides great service and very helpful in assisting their passengers.

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

I so appreciate the crew members on each flight of United. They are outstanding.

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

One of the best flight experiences I've have had in along time. Would fly with them again.

Like getting a bus. No great luxury but will get you there

Got us to destination alive, albeit a bit late. Luggage was left behind. No live tracking app available (available on some other airlines). Supposedly going to be delivered in next couple of days.

So, the trip from Dublin to LA did not really happen because the flight took off before we could finish the transfer.

Very nice experience. Flight had good entertainment system and good food options. Customer service was very friendly and nice as well.

The connection time between the regional flight (from Newcastle) to an international flight (to The States) was too short. To require as second security scan and customs clearance within an hour and 20 mins is not enough time to make the actual connection. We had a final boarding call the minute we walked out of US customs and had to sprint (with two small children) through 20 gates to make it in time before the door closed. The concept is great in theory to clear customs before leaving Europe, but the timing needs to be adjusted. We travel abroad frequently and won’t be using this route again. Thanks.

Like - the crew were nice Dislike - sitting on the tarmac for long periods after boarding and landing.

I was not admitted to the flight!!! i need a refund for this.

One of the best flights I've been on in a while. Very genuinely friendly staff. Courteous, kind, respectful. On a past flight (not Aer Lingus) I remember being woken up rudely to put my seat forward. Like a child being berated for something. Oddly jarring experience when someone could just tap you gently on the shoulder and gesture kindly. But I noticed the Aer Lingus staff were incredibly patient with everyone on the plane. It's the holiday season and I noticed a lot more elderly customers on the plane than I typically see flying, and the staff went above and beyond with helping accommodate people. Service throughout the flight was flawless. They came through offering water, and picking up garbage at perfect intervals. Seemed like this flight, everyone was on point. And the flight landed early on top of that

Seats are small, but comfortable and more space around you, so for a normal person the seats are perfect. If you are a big and fat individual, I would not think the seats are comfortable. All else was good and normal. Lots of movies to watch.

Boarding, crew, food and baggage handling excellent (no bags lost, yay!). However for an 8 hour flight, there were limited entertainment options. And really would have liked to have a pillow!

The crew was super friendly and helpful. The food was quite good. An overall positive experience.

Plane delayed due to weather. Plane boarded, then told to unboard due to a maintenance issue.

A more organized boarding experience and better food would have made the experience better.

Was all good.l including a sofdrink. AA improved significantly. There was no entertainment.

why can't planes be boarded from back to front?? everything was great otherwise

We flew into Barcelona and the plane was so cramped and very uncomfortable and dirty. But we flew out of Madrid and that plane was much better. Would fly Iberia again.

For what we are willing to pay for international air travel, our experience was very good. We had no problem checking in, we had very little wait time at the AA counter in Madrid, and the staff in Madrid were very helpful. The flight crew was helpful and courteous, the plane was on the newer side, and our assigned seats were together without us needing to purchase them. The flight took off on time and arrived early. Overall, it was a pleasant experience or as much as could be expected in economy for almost 10 hours.

Boarding was easy, the flight left on time and even landed 20 minutes early. The food was plentiful and really good! The crew was kind & helpful. Overall it was an exceptional experience!

We were delayed 2 hours because the crew was late. They need better planning by the crew, we had to sit in uncomfortable seats waiting for them.

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

The flight crew was kind, flexible, and accommodating. The seats on the plane were extremely uncomfortable.

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

My seat cushion was poor. The cushion was compressed and was uncomfortable for such a long flight.

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

Information on your arrival and departure airports