LHR - PHL

$459 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 9/5. 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
$844
Typical prices: $1,162-$799
Multiple Airlines
Fri 6/26Mon 6/29
LHR - PHL • 2 stops
Cheapest non-stop
$845
Typical prices: $1,152-$840
Finnair
Fri 7/10Thu 7/16
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.
For more comfort, BA Premium Economy adds legroom; Iberia Premium Economy has 37-inch pitch.
American Main Cabin Extra adds early boarding; arrive 3 hours early at Heathrow.
Expert advice
Expert advice
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Expert advice
Expert advice
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Top airlines
Cheapest • from $845 (round-trip)
Best reviews • 7.3 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
You can fly direct with American Airlines and British Airways. Average duration is 7h 55m
Direct flights
Direct flights
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Direct flights
Direct flights
+1
Avoid delays
Most punctual • 82% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $925 (round-trip)
Shortest trip • 10h 19m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 32% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 14% price drop
Most popular
Good to know
Good to know
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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 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

Fri, Jun 26 - Mon, Jun 29
Multiple Airlines Logo
2:10 pm - 11:44 pm
LHR
-
PHL
14h 34m
2 stops
Multiple Airlines Logo
10:05 am - 6:35 am
PHL
-
LHR
15h 30m
2 stops
$844Multiple Airlines
Fri, Jul 10 - Thu, Jul 16
Lufthansa Logo
9:30 am - 4:05 pm
LHR
-
PHL
11h 35m
1 stop
Lufthansa Logo
5:40 pm - 8:45 pm
PHL
-
LHR
22h 05m
2 stops
$845Lufthansa
Mon, Jun 22 - Sun, Jun 28
British Airways Logo
9:10 pm - 4:00 pm
LHR
-
PHL
23h 50m
1 stop
British Airways Logo
7:20 pm - 7:50 am
PHL
-
LHR
7h 30mnonstop
$847British Airways
Tue, Jun 23 - Sat, Jun 27
British Airways Logo
1:25 pm - 6:55 pm
LHR
-
PHL
10h 30m
1 stop
British Airways Logo
7:40 pm - 8:00 am
PHL
-
LHR
31h 20m
1 stop
$848British Airways
Mon, Jun 22 - Fri, Jul 3
Iberia Logo
9:15 am - 12:10 pm
LHR
-
PHL
7h 55mnonstop
Iberia Logo
7:35 pm - 7:50 am
PHL
-
LHR
7h 15mnonstop
$849Iberia
Fri, Jul 10 - Thu, Jul 16
Iberia Logo
9:15 am - 12:15 pm
LHR
-
PHL
8h 00mnonstop
Iberia Logo
10:15 pm - 10:20 am
PHL
-
LHR
7h 05mnonstop
$850Iberia
Fri, Jun 19 - Tue, Jul 28
British Airways Logo
9:15 am - 12:10 pm
LHR
-
PHL
7h 55mnonstop
British Airways Logo
8:25 pm - 11:10 am
PHL
-
LHR
9h 45m
1 stop
$851British Airways
Sat, Jun 20 - Wed, Jul 29
British Airways Logo
9:15 am - 12:10 pm
LHR
-
PHL
7h 55mnonstop
British Airways Logo
8:25 pm - 11:10 am
PHL
-
LHR
9h 45m
1 stop
$852British Airways
Fri, Aug 21 - Wed, Dec 16
United Airlines Logo
9:30 am - 2:49 pm
LHR
-
PHL
10h 19m
1 stop
United Airlines Logo
8:00 pm - 7:10 am
PHL
-
LHR
30h 10m
2 stops
$853United Airlines
Fri, Jun 26 - Mon, Jun 29
British Airways Logo
9:15 am - 12:10 pm
LHR
-
PHL
7h 55mnonstop
British Airways Logo
10:10 pm - 10:20 am
PHL
-
LHR
7h 10mnonstop
$854British Airways
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.

How much is a round-trip flight from London Heathrow Airport to Philadelphia?

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

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, Monday 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 $714 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $968 and $951 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 1 stop layover the cheapest option at $750 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 4 weeks before departure, which saves you about 32% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 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
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.

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.

Good to know

Low seasonFebruary
Cheapest flight$459
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 16% 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 5 days, the lowest price for a flight from London Heathrow Airport to Philadelphia was $459 for a one-way ticket and $844 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, Air France, KLM, 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 $994 and an overall rating of 7.3, Aer Lingus is the most popular choice. American Airlines is also a great choice for the route, with an average price of $814 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 $735 or less one-way and $797 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 3 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.
7.3
Aer LingusOverall score based on 1603 reviews
7.4Boarding
7.2Comfort
7.0Entertainment
6.7Food
8.1Crew
Airline reviews

Boarding was fine, difficult to understand the guy over the speaker though so we were unsure when exactly to board until they updated the monitor by the gate. Flight itself was fine, nice flight attendants, seats were comfortable enough, good selection of entertainment on the screens. Other airlines at a similar price point have included wifi though, at a minimum messaging, for free, so that was a little disappointing to not have that. But otherwise fine. Food was pretty decent, nice hot meal, good drink selection, nice snacks. Bathrooms were ok, could've been cleaned a little more often, but they were never bad.

8.0 ExcellentTim, Jun 2026
DUB - LAX
Read more Aer Lingus reviews

Boarding was fine, difficult to understand the guy over the speaker though so we were unsure when exactly to board until they updated the monitor by the gate. Flight itself was fine, nice flight attendants, seats were comfortable enough, good selection of entertainment on the screens. Other airlines at a similar price point have included wifi though, at a minimum messaging, for free, so that was a little disappointing to not have that. But otherwise fine. Food was pretty decent, nice hot meal, good drink selection, nice snacks. Bathrooms were ok, could've been cleaned a little more often, but they were never bad.

Aer Lingus App never showed the gate and the board did not update until very close to the time the gate was due to close. Both planes departed late but no announcement was made which would have saved a run for the gate.

Vegetarian food option was very poor. Effectively, overcooked rice ("risotto"). Zero protein which is always disappointing with no vegetables and poorly seasoned. Basically had lots of carbs on 6-hour flight. Not acceptable for business class in 2026. Flight was otherwise very good.

Small plane. Tight seating . What can one say except that it was fast!

I sat in the first row behind first class. There was plenty of legroom. The entertainment was great. I saw two excellent movies and one episode of a sitcom. Also enjoyed the flight tracker.

OK overall. Flight was delayed Crew on flight was good

On time, only a little turbulence, very competent and caring attendants. Clear information.

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.

The flights are literally always delayed arriving, boarding and taking off so they are always late for the connection. I planned ahead so I was okay but many others aren't. The food was terrible. The staff was very pleasant. I appreciate boarding back to front.

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.

My flight times changed 4 times since I originally booked the flight. The last time being the day of flight - a 2 hour delay. This meant instead of getting into IAH at 9:30p, I got in at 2:30a. This was very disappointing!!!

The seats. The seat in front of me was awful and when the guy sat down, it flew back and hit my head when I was putting my backpack under the seat, It didn't make for a pleasant experience,

Cancelled flight. Still waiting to get home for grand daughter’s graduation .

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

As we approached Denver, we encountered quite a bit of turbulence. I know this can sometimes be the case as I frequently fly this route but not on American. My gripe: Usually a pilot or co-pilot alerts passengers to the possibility of turbulance ahead of time. This did not occur nor did he communiucate during what was a pretty rough ride.

When I booked my flight a month ago - I selected a seat. That seat was NOT the one I ended up with when I checked into my flight the day before. This is the second time this has occurred. So, I checked my next flight on Wednesday and Thursday and no seat was assigned. Poor, very poor customer service.

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

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

We changed our flight because of weather. Unfortunately we were on hold for over an hour, but since we were 5 people who all booked individually, we felt more comfortable doing it with an agent. It all worked out in the end.

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.

Thanks to a delay of an hour of my flight to Philadelphia on American Airlines I missed my connecting flight to Amsterdam. On arrival at Philadelphia he crew on the delayed flight did not ask the passengers to let connecting passengers get off first and I arrived a few minutes after boarding was closed at the original time for the flight to AMS, this despite the fact that I had received a message from American Airlines that departure was delayed by 25 minutes. Overall very poor service, no effort from the part of American Airlines to accommodate the passenger, just rebook the flight for the next day.

Seats not as comfortable as I had hoped. Food was very nice, service was fine. Entertainment options very nice. Had thought the premium economy was a more plus 2-3-2 layout but it was a 2-4-2 with seats not as wide as I had expected.

I liked my seats on the return trip. Didn't like having to pay for luggage on an international flight. Also didn't like that it was on American airlines and not British Airways. I specifically selected a BA flight to experience that airline.

I flew four flights on British Airways within two weeks. I was unable to download the boarding pass to my phone for any of the four flights. I could check-in for my flight but the system would not give me boarding pass. I tried multiple ways and multiple times. I discovered many other passengers also had the same issue with their boarding passes. No explanation or acknowledgement by BA.

Lovely big plane. Excellent take off and landing. Cabin crew were so nice. Flight in time no delays

Because our ABZ-LHR flight was cancelled by BA for reasons they refuse to tell us--not weather--we did not make this flight and were booked on the following day. BA offered no assistance to us on the phone or in the airport, and we had to find a hotel at Heathrow on our own.

Horrible - flight was delayed by 6 hours - we boarded, were made to de-board due some technical fault; aircraft changed; special meals request on new flight - all went awry. Landed in Dulles airport; breezed thru immigration; as Business Class passengers or baggage was delivered almost 90 minutes after landing; air tags indicated the bags were just near the carousel but the unhelpful BA staff - Maria and Ghina refused to give any update - palming it off on some imaginary invisible “manager” despite air tags evidence showing it right there. So about 50-60 passengers waiting and getting infuriatingly impatient for their bags coz one container was not delivered. Finally after much argument by some other passengers Maria condescended to go to the “ramp” and within 5 minutes the baggage was delivered miraculously. Question is why couldn’t she have done it one hour earlier ? Poor poor experience once again on Business Class BA.

Cheap Flight Fares would not provide booking info. I canceled the reservation and we arbitrated with American Express. They provided erroneous info to Amex and it was determined that C.F.F. deserved the price of the ticket. Worse experience I've ever had.

Seating space is appalling. Seats and all surrounding area in "Economy" is built for individuals shorter than 4' 10" and below 120 lbs. Ridiculous. While I'm not expecting fine dining, the food was the worst airplane food that I can recall.

Business class lounge for my gate was closed and no email was sent, causing me to walk back and forth to different gates, etc for over 20 minutes one way. Flight entertainment was mediocre with very poor choices especially for business class cabin. Original flight was cancelled and rebooking was difficult and no reason given for cancellation.

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

Information on your arrival and departure airports