£155 Find Cheap Flights from Philadelphia to the United Kingdom

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 the United Kingdom departing on 22/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap Flights from Philadelphia to the United Kingdom

Cheapest return prices found by our users on KAYAK in the last 72 hours
London
London3 stops£453
Manchester
Manchester3 stops£419
Edinburgh
Edinburgh2 stops£436
Birmingham
Birmingham2 stops£473
Bristol
Bristol2 stops£582
Aberdeen
Aberdeen1 stop£455
Liverpool
Liverpool1 stop£444
Leeds
Leeds2 stops£486
Inverness
Inverness2 stops£356
Newquay
Newquay2 stops£672
Cardiff
Cardiff2 stops£577
London
London3 stops£453
Manchester
Manchester3 stops£419
Edinburgh
Edinburgh2 stops£436
Birmingham
Birmingham2 stops£473
Bristol
Bristol2 stops£582
Aberdeen
Aberdeen1 stop£455
Liverpool
Liverpool1 stop£444
Leeds
Leeds2 stops£486
Inverness
Inverness2 stops£356
Newquay
Newquay2 stops£672
Cardiff
Cardiff2 stops£577

Book Cheap Philadelphia to the United Kingdom Plane Tickets

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

Wed, 18 Feb - Mon, 23 Feb
Multiple Airlines Logo
16:05 - 20:25
PHL
-
MAN
23h 20m3 stops
Multiple Airlines Logo
21:30 - 14:47
MAN
-
PHL
22h 17m3 stops
£419Multiple Airlines
Wed, 18 Feb - Mon, 23 Feb
Multiple Airlines Logo
16:05 - 21:00
PHL
-
GLA
23h 55m3 stops
Multiple Airlines Logo
23:35 - 14:47
GLA
-
PHL
20h 12m3 stops
£420Multiple Airlines
Tue, 24 Mar - Tue, 31 Mar
Multiple Airlines Logo
18:30 - 07:35
PHL
-
MAN
9h 05m1 stop
Multiple Airlines Logo
13:05 - 19:00
MAN
-
PHL
10h 55m1 stop
£435Multiple Airlines
Thu, 12 Feb - Mon, 16 Feb
Multiple Airlines Logo
16:05 - 19:40
PHL
-
EDI
22h 35m2 stops
Multiple Airlines Logo
22:30 - 14:47
EDI
-
PHL
21h 17m3 stops
£436Multiple Airlines
Wed, 4 Feb - Tue, 10 Feb
British Airways Logo
18:35 - 10:45
PHL
-
GLA
11h 10m1 stop
British Airways Logo
08:55 - 16:15
GLA
-
PHL
12h 20m1 stop
£438British Airways
Wed, 28 Jan - Tue, 3 Feb
British Airways Logo
18:35 - 12:50
PHL
-
GLA
13h 15m1 stop
British Airways Logo
09:50 - 16:15
GLA
-
PHL
11h 25m1 stop
£439British Airways
Sun, 25 Jan - Sat, 31 Jan
JetBlue Logo
13:30 - 06:55
PHL
-
LHR
12h 25m1 stop
JetBlue Logo
09:20 - 18:38
LHR
-
PHL
14h 18m1 stop
£469JetBlue
Wed, 4 Feb - Sun, 8 Feb
American Airlines Logo
19:50 - 14:15
PHL
-
BHD
13h 25m1 stop
American Airlines Logo
06:30 - 13:30
BHD
-
PHL
12h 00m1 stop
£502American Airlines
Wed, 4 Feb - Sun, 8 Feb
American Airlines Logo
16:44 - 10:15
PHL
-
BHD
12h 31m2 stops
American Airlines Logo
06:30 - 13:30
BHD
-
PHL
12h 00m1 stop
£505American Airlines
Wed, 4 Mar - Sun, 8 Mar
Aer Lingus Logo
17:30 - 07:50
PHL
-
EDI
9h 20m1 stop
Aer Lingus Logo
08:20 - 17:00
EDI
-
PHL
12h 40m1 stop
£514Aer Lingus
Booking Insights

KAYAK's insights & trends for Philadelphia to the United Kingdom flights

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

What is the cheapest Philadelphia to the United Kingdom flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to the United Kingdom from Philadelphia found in the last 72 hours was to London, at £327 return. The most popular route is from Philadelphia (PHL) to London Heathrow Airport (LHR), and the cheapest round-trip airline ticket found on this route in the last 72 hours was £327.

Can I save money by flying with a stopover from Philadelphia to the United Kingdom?

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 1 stop stopover the cheapest option at £683 on average.

What is the cheapest month to fly from Philadelphia to the United Kingdom?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to the United Kingdom, 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 the United Kingdom is September, when tickets cost £482 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of return tickets is £838 and £693 respectively.

What’s the cheapest day of the week to fly from Philadelphia to United Kingdom?

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

If your flying dates are flexible, you should consider flying to United Kingdom on a Tuesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Philadelphia to United Kingdom. For your return ticket, we recommend flying on a Wednesday and avoiding Sundays for the best deals.

How far in advance should I book a flight from Philadelphia to the United Kingdom?

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 the United Kingdom, 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 a flight from Philadelphia to the United Kingdom, you should book around 2 weeks before departure, which saves you about 44% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know - Cheap tickets from Philadelphia to the United Kingdom

Low seasonJanuary
Best time to beat the crowds (1% less expensive on average)
Most popular time to fly and prices are also 11% lower on average.

Flights from Philadelphia to the United Kingdom: the best tips from KAYAK users

Insights shared by verified travellers who flew the route from Philadelphia to the United Kingdom 
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 - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Philadelphia to the United Kingdom?

    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 the United Kingdom.

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

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

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

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

    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 from Philadelphia to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to the United Kingdom?

    The cheapest time of day to fly to the United Kingdom is generally in the morning, when retur flights cost £497 on average. Morning departures are around 15% cheaper than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally in the afternoon, which is peak travel time and where the average cost of a ticket is £738.

Top tips for finding a cheap flight from Philadelphia to the United Kingdom

  • Looking for a cheap flight from Philadelphia to the United Kingdom? 25% of our users found tickets from Philadelphia to the United Kingdom for the following prices or less: London £653 one-way - £383 round-trip

Reviews of the top 5 airlines flying from Philadelphia to the United Kingdom

 
Need help choosing which airline to fly with from Philadelphia to the United Kingdom? 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
American AirlinesOverall score based on 11049 reviews
6.9Entertainment
6.5Food
7.5Boarding
7.2Comfort
8.0Crew
Airline reviews

Delays to take off and to leave the plane after landing added a lot of time to this flight.

6.0 GoodMiguel, Oct 2025
PHL - MIA
Read more American Airlines reviews

Delays to take off and to leave the plane after landing added a lot of time to this flight.

The Phildalphia to Allentown portion was a BUS, not a plane. All was as expected.

Excellent - explanations were clear staff was nice and flight was comfortable

Airport in MXP is crazy. Get there at least 2 hours before flight.

Flight was delayed not sure why no explanation given and no apologies either. Otherwise the flight was fine

Did not get the seat I selected and paid for.

The flight was canceled 3 hours after original take off time

Plane was delayed for 6 hours, at first by weather, which is understandable, but was further delayed with NO given reason for 2 1/2 hours more. We had no clue when we were going to depart actually until they opened the ramp. VERY POOR to ZERO COMMUNICATION!!!

Flight was delayed and after being in the airport for like seven hours, it was canceled.

Flight delays numerous times. Everytime we would get close to boarding it would be delayed again. Strung along the entire time.

Flight takeoff was delayed an hour, but arrival time was not updated at the same time as departure time, so those picking me up at the other end were not alerted to the change in my arrival.

Seats are terribly cramped. I’m only 5’2” and my knees were practically in my face. No room to put a normal size bag under the seat and when the person in front of you reclined their seat your tray table was in your lap. This is the airline’s way of cramming more seats into the plane to make more money. I’ll think twice about taking Aer Lingus again since there are a few other options from Boston to the Emerald Isle.

Couldn’t check In online, message was couldn’t check in until Sunday morning though plane left Saturday night. Checked in okay at airport but caused slot if stress.

This flight left about 45 minutes late, and arrived about 45 minutes late, which was enough to make us miss our next flight and trap us in Dublin for 24 hours!!

The boarding process was not good. From check-in, there was only one desk for check-in, which made for a very long line. I asked to print out my boarding pass for the next leg of my trip, also via Aer Lingus, and they said they couldn't. I was unable to do this on the app or online, either. Many fellow passengers I spoke to had the same issue. Because the plane was delayed taking off by 90 minutes, everyone had to quickly go to a desk for their next boarding pass which was chaos. Overall it wasn't a smooth or happy experience.

Fast and sensible boarding was absolutely amazing. But extortionate wifi and seats that barely moved, making me unable to sleep, didn't do a lot of favors.

I liked the front row seats. A lot of leg room. The check-in window needs to be longer

My flights with Aer Lingus were very good and I will definitely fly with them. Again in future trips to Ireland and Scotland.

Too hot. Asked for an extra glass of water and was ignored. Asked to sit in empty seats that were open because it was so hot and crowded and was denied and the seats were empty the entire flight

Terrible leg room - I’m 5’3” and my knees were touching the seat in front of me. When the person sitting in front of me leaned back, there was about 15 inches of space between my head and the TV screen which made it awkward to view movies. Last year they had decent food, but this year the only tasty item on the trip was dessert.

The ride share experience in JFK is terrible. After traveling on a flight, then you need to take a subway to the last stop to get an uber or lyft. Unacceptable. Bad job JetBlue for permitting JFK and Port Authority to do this to your passengers.

Checking In on JetBlue site was impossible. It hung up on REAL ID. Even my Global Entry did not help. Luckily, on Kayak site it was a breeze. Entire flight the temperature was COLD! Otherwise the crew was great!

The flight was two hours late due to a computer fault and resulting maintenance. Nothing was offered as compensation beyond bottles of water during the time we were deplaned and waiting in the terminal.

Very pleasant flight attendants. Gate crew rather loud chatting with each other.

Four plus hour flight delay in New York caused us to take off after 11:30pm. We didn’t arrive at our hotel until five hours after check in. Started the trip off feeling exhausted.

Plane was in bad shape. TV’s and WiFi didn’t work. Plane need a refresh. Not enough room for bags.

There was a fowl odour coming from the lavatory the entire flight

Everything was great. I liked the text updates so that I never miss a gate change & I have all the latest info.

I don’t usually fly budget airlines or airlines in the United States. It was as good as any other airline. The seats are comfortable and the airline attendants are not rude & surly. Very nice flight (s).

No internet on a flight over three hours in this age is criminal. Staff inattentive and dismissive

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

The staff was very nice and helpful. Some of the best crew I have met.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

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

I've taken British Airways before and it has been great. On this trip to Spain and Portugal we had two BA flights. On both flights we were taken by bus from the terminal out to the plane on the tarmac. There were many older folks on these flights, and to ask people in their 70s to lug their carry-on and personal items up the long mobile staircase to the plane entrance, is very disturbing. I won't be taking British Airways in the future. Many people on these flights were very unhappy.

The food on the flight was of marginal quality. Small bits of chicken, instant mashed potatoes and some carrots. The rolls were very dry, nearly inedible. The seats were quite small and didn’t allow for any shifting of position during the flight. There was limited leg room.0

The seats are so small that you can barely move at all. Don't try to eat with utensils in your seat either - you will elbow your neighbor in the face. Miserably small and I swear they are shrinking every time I fly. Food was meh (per usual), but at least there is free alcohol on an overseas flight. Doesn't make up for sitting in a torture chamber while hurtling through the air with hundreds of fussy people, but it's something. Entertainment options (movies, shows) are okay, nothing special, but at least there are screens, because most of the seats in these large planes do not have adjustable lighting - or air control - that you can get to, it's too high to reach - which makes reading impossible. Zero stars, AA.

Terrible customer service. I booked business class and the counter agent didn’t bother asking me about any choice or preferred seat, basically assigned me that last seat and couldn’t even answer if it was a business class seat. Also iberia lost my suitcase on my flight from JFK to MAD with the layover in BCN. Useless customer service at the counter. Thank goodness I happened to check the baggage claim area of the next flight in…there it was.

Disaster. Downgraded. Zero apology. No effort or coordination between gate and crew. Awful seat blocked by door emergency slide box. Iberia is a mess. App never works. Avoid this airline.

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Although business class, the seating was really cramped. The food was so so.

Smooth trip no turbulence which is always a bonus for me lol! In cattle class so an element of being a bit squished (but not as bad as other shorter haul airlines) smaller plane than the one we flew out on and entertainment system wasn’t as modern but still definitely passed the time. Lovely crew x

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Seat pitch is not enough to eat comfortably. When seat in front is reclined, your screen comes closer to your face. Ryanair seats are actually more comfortable.

The leg from Portland to Heathrow was great for a business class ticket. The BA leg from Heathrow to Lisbon was terrible. Basically coach seating with an empty seat between you and next passenger. Absolutely no leg room. Should not have been charged for business class and it was a 3 hour flight.

The flat beds. Other than that, the place was not clean.

Moved me away from my family and refused to fix it.

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

Everything you need to know for your flight from Philadelphia to the United Kingdom

Information on your arrival and departure airports