LHR - PHL

$427 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 5/8. 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 Philadelphia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Philadelphia, 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 London to Philadelphia, 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 round-trip
$634
Overall average: $699
JetBlue
Tue 4/21Tue 4/28
LHR - PHL • 1 stop
Cheapest non-stop
$642
Typical prices: $680-$856
British Airways
Wed 4/15Sun 4/19
LHR - PHL • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
American Airlines' Main Cabin Extra includes early boarding.
Bring water on Iberia flights to avoid dehydration.
Expert advice
Expert advice
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Expert advice
Expert advice
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Top airlines
Cheapest • from $621 (round-trip)
Best reviews • 7.2 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with American Airlines and British Airways. Average duration is 7h 58m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Avoid delays
Most punctual • 84% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $940 (round-trip)
Shortest trip • 11h 21m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 36% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 11% price drop
Most popular
Good to know
Good to know
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We hope you love your trip to Philadelphia!
Flight Deals
Booking Insights
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 round-trip 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 round-trip flight deals from Heathrow to Philadelphia

Tue, Apr 21 - Tue, Apr 28
JetBlue Logo
8:40 am - 9:59 pm
LHR
-
PHL
18h 19m
1 stop
JetBlue Logo
8:25 am - 6:30 am
PHL
-
LHR
17h 05m
1 stop
$634JetBlue
Wed, Apr 15 - Sun, Apr 19
British Airways Logo
1:45 pm - 4:35 pm
LHR
-
PHL
7h 50mnonstop
British Airways Logo
6:40 pm - 6:50 am
PHL
-
LHR
7h 10mnonstop
$642British Airways
Thu, Apr 9 - Tue, Apr 14
Multiple Airlines Logo
10:35 am - 6:55 pm
LHR
-
PHL
13h 20m
1 stop
Multiple Airlines Logo
8:25 pm - 9:00 pm
PHL
-
LHR
19h 35m
1 stop
$658Multiple Airlines
Tue, Apr 21 - Tue, Apr 28
JetBlue Logo
8:40 am - 9:59 pm
LHR
-
PHL
18h 19m
1 stop
JetBlue Logo
6:00 am - 6:30 am
PHL
-
LHR
19h 30m
1 stop
$662JetBlue
Tue, Apr 14 - Tue, May 5
JetBlue Logo
8:40 am - 7:35 am
LHR
-
PHL
27h 55m
1 stop
JetBlue Logo
6:33 pm - 6:30 am
PHL
-
LHR
30h 57m
1 stop
$665JetBlue
Mon, Apr 20 - Mon, Apr 27
JetBlue Logo
8:40 am - 5:38 pm
LHR
-
PHL
13h 58m
1 stop
JetBlue Logo
6:00 am - 6:30 am
PHL
-
LHR
19h 30m
1 stop
$669JetBlue
Mon, Apr 13 - Mon, Apr 20
Air Canada Logo
8:40 am - 10:43 pm
LHR
-
PHL
19h 03m
2 stops
Air Canada Logo
9:15 am - 9:00 pm
PHL
-
LHR
30h 45m
2 stops
$671Air Canada
Mon, Jun 1 - Sun, Jul 19
United Airlines Logo
4:40 pm - 11:44 pm
LHR
-
PHL
12h 04m
1 stop
United Airlines Logo
7:45 pm - 10:40 am
PHL
-
LHR
9h 55m
1 stop
$672United Airlines
Mon, Apr 20 - Tue, May 5
JetBlue Logo
8:40 am - 5:38 pm
LHR
-
PHL
13h 58m
1 stop
JetBlue Logo
6:33 pm - 6:30 am
PHL
-
LHR
30h 57m
1 stop
$675JetBlue
Mon, Apr 20 - Wed, May 13
JetBlue Logo
8:40 am - 5:38 pm
LHR
-
PHL
13h 58m
1 stop
JetBlue Logo
8:25 am - 6:30 am
PHL
-
LHR
17h 05m
1 stop
$677JetBlue
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.

For London Heathrow Airport to Philadelphia, Thursday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Philadelphia back to London Heathrow Airport, the best deals are generally found on Wednesday, with Saturday being the most expensive.

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 September, where tickets cost $680 (return) on average. On the other hand, the most expensive months are July and December, where the average cost of round-trip tickets is $903 and $897 respectively.

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

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $700 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 36% 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 and LHR

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.

Harriet Baskas

Harriet Baskas

Expert on American Airlines and PHL

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, USA TODAY, 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.

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, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Good to know

Low seasonFebruary
Cheapest flight$427
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 17% increase in price.
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 round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 travelers 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

  • 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 $427 for a one-way ticket and $621 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and Philadelphia?

    Yes, you'll most likely have to show a valid passport before boarding the plane in London Heathrow Airport and on arrival in Philadelphia.

  • 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, KLM, Air France, and Virgin Atlantic 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?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from London to Philadelphia are Aer Lingus and American Airlines. With an average price for the route of $1,178 and an overall rating of 7.2, Aer Lingus is the most popular choice. American Airlines is also a great choice for the route, with an average price of $797 and an overall rating of 7.1.

  • 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 travelers 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 round-trip ticket. You could then fly to Philadelphia with an airline and back to London Heathrow Airport with another airline. Booking your flights between London Heathrow Airport and PHL can sometimes prove cheaper using this method.

  • 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? 25% of our users found flights on this route for $614 or less one-way and $784 or less round-trip.

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 4 airlines serving 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.
7.2
Aer LingusOverall score based on 1477 reviews
7.4Boarding
7.1Comfort
7.0Entertainment
6.6Food
8.1Crew
Airline reviews

All aspects were excellent - it helped that the flight was only 2/3 full and I had no one sitting in my row. The Pre-check (US Passport Control and Customs) in Dublin made everything so easy when we arrived in Chicago.

10.0 ExcellentJohanna, Feb 2026
DUB - ORD
Read more Aer Lingus reviews

All aspects were excellent - it helped that the flight was only 2/3 full and I had no one sitting in my row. The Pre-check (US Passport Control and Customs) in Dublin made everything so easy when we arrived in Chicago.

I love the direct flights. It saves a lot of hassle and allows immigration and customs in Ireland, making arrival much easier.

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.

American Airlines did everything they could with the high Spring Break crowd. I was frustrated to be changed from 1st class to a middle seat at the back of the plane. This has happened before, not sure booking 1st class and paying the extra actually works.

Older airplane with worn out seats. No entertainment system at all. Connecting to Wi-Fi was problematic and hit and miss.

I didn't end up taking this flight. I got up at 4am for a flight that was supposed to board at 6am - at 5:55am you delayed the flight to 10am. The airport is under construction so I switched to a later flight as I wasn't going to sit in the airport for 4 hours. They said the delay was due to the crew needing rest from a flight coming in late the night before - if that was the case then I think you should have delayed the flight much sooner so that passengers wouldn't get up so early and get to the airport to sit and wait.

I very rarely fly American and my experience today reenforces that is the correct decision. While the staff were all very courteous, our flight was first thing in the morning so there was no reason to be delayed, yet appropriate maintenance checks weren’t completed prior to our flight so we were delayed multiple times. Not a great showing, American Airlines.

Boarding is always an ordeal. Less dogs on flights. I am highly allergic to dogs and cats. Why are there so many animals these days?

I was on a small regional flight from Detroit to Philadelphia. When we landed the outside cruise needed to turn something off with the engine, which took quite a long time. Then, when they allowed us to get off the plane it was outside. They took their time, unloading all the luggage and waited till they unloaded all the luggage before they brought it over to us. It was 9 o’clock at night freezing cold out, and there was no proactive hustle to try to get people their luggage. It was really one of the worst experiences I think I’ve ever had with American until a manager came over. I don’t think they were going to even consider pulling the luggage over to the people that had been waiting outside for at least 10 minutes in the freezing cold.

Awful. Original flight was delayed 5 hours. Had to to take a connecting flight instead of direct. Had a 4 hour layover. I missed all of my morning meetings getting in 5 hours later than I was supposed to and had to change to take a later flight the next day to get them back in which cia time another $150.

I was trying to take 2 one and a half hour one way trips and I experienced almost 20 delays over the course of those two trips. Only a few of them were due to weather the rest was disorganization

The attendants were kind and helpful. A sugar-free drink would have been very welcome.

The entertainment options were at best, fair. It was exactly the same as my outbound flight. It would have been more entertaining if there were some series from Apple TV, HBO, Showtime or other carriers for me to catch up with.

Very nice staff, terrible food, not very comfortable premium economy.

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!

the service on Business class should be improved to be at par with industry leaders like Cathay Pacific and Singapore AIrlines. A lot of room for improvement.

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

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.

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

Information on your arrival and departure airports