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Cheap flights from Philadelphia to London from £171

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — LON
5 Aug — 12 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Philadelphia to London are usually found in September or November, booked 14 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

Cheap flight deals from Philadelphia to London

Enter your travel dates to find the best prices.

Cheapest flights from Philadelphia to London
Explore the most affordable flight options available from Philadelphia to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 July 2026.

Mon 16/1119:40
PHL
-
LHR
1 stop30h 00m
United Airlines
Sun 22/1113:00
LHR
-
PHL
1 stop30h 44m
United Airlines
Deal found 1/7£650
Fri 11/1217:05
PHL
-
LHR
2 stops46h 55m
Multiple Airlines
Mon 14/1217:50
LHR
-
PHL
2 stops27h 15m
Multiple Airlines
Deal found 2/7£653
Wed 7/1016:20
PHL
-
STN
2 stops22h 10m
Multiple Airlines
Tue 13/1006:30
STN
-
PHL
2 stops14h 11m
Multiple Airlines
Deal found 1/7£653
Thu 3/909:12
PHL
-
LGW
1 stop19h 23m
Multiple Airlines
Sun 6/918:35
LGW
-
PHL
2 stops26h 30m
Multiple Airlines
Deal found 2/7£653
Mon 28/917:40
PHL
-
LHR
2 stops14h 20m
Multiple Airlines
Wed 7/1013:25
LHR
-
PHL
1 stop10h 30m
Multiple Airlines
Deal found 2/7£654
Thu 30/707:00
PHL
-
STN
2 stops31h 35m
Multiple Airlines
Mon 3/806:30
STN
-
PHL
2 stops32h 39m
Multiple Airlines
Deal found 4/7£654
Sun 26/706:30
PHL
-
LGW
2 stops22h 30m
Multiple Airlines
Thu 13/814:00
LGW
-
PHL
1 stop15h 53m
Multiple Airlines
Deal found 3/7£654
Thu 3/920:55
PHL
-
LHR
1 stop28h 35m
Multiple Airlines
Mon 14/908:40
LHR
-
PHL
2 stops17h 52m
Multiple Airlines
Deal found 2/7£655
Sun 23/817:40
PHL
-
STN
3 stops25h 00m
Multiple Airlines
Wed 26/812:00
STN
-
PHL
2 stops35h 55m
Multiple Airlines
Deal found 4/7£655
Wed 5/813:28
PHL
-
LGW
1 stop15h 32m
Multiple Airlines
Thu 13/814:00
LGW
-
PHL
1 stop13h 55m
Multiple Airlines
Deal found 2/7£655
Wed 2/909:12
PHL
-
LHR
1 stop16h 18m
Multiple Airlines
Tue 15/906:50
LHR
-
PHL
2 stops13h 51m
Multiple Airlines
Deal found 2/7£656
Mon 10/815:25
PHL
-
STN
2 stops20h 30m
Multiple Airlines
Wed 19/807:25
STN
-
PHL
2 stops19h 09m
Multiple Airlines
Deal found 3/7£656

Find flight deals from Philadelphia to London

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 6 July 2026.

Round-trip from

£650

One-way from

£171

Popular in

June

Cheapest in

September

Average price

£818

Good round-trip deal

£827 or less

Good one-way deal

£246 or less
United Airlines
  • United Airlines
  • 16/11-22/11
  • 2 total stops
  • 60h 44m total
  • Philadelphia to London
Search Deals
1/8
  • 1/8
  • 2 total stops
  • 39h 28m total
  • Philadelphia to London
Search Deals
Highest demand for flights based on searches. 28% potential increase in price (£184 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (£33 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Philadelphia to London (LON).
Search Deals
Price to beat on a one-way flight from Philadelphia to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Philadelphia to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 6 July 2026.
Use the filters below to find and compare flights from Philadelphia to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 24/8

09:12-06:30

1 stop16h 18m

London Heathrow

Wed 26/8

08:40-20:01

1 stop16h 21m

£669

PhiladelphiaLondon

PHL - LCY

PHLLCY

Philadelphia

Fri 13/11

19:40-18:30

2 stops41h 50m

London City

Mon 16/11

13:30-16:05

2 stops31h 35m

£674

PhiladelphiaLondon

PHL - LTN

PHLLTN

Philadelphia

Mon 21/9

16:20-18:05

2 stops20h 45m

London Luton

Thu 24/9

05:40-18:55

2 stops18h 15m

£677

PhiladelphiaLondon

PHL - STN

PHLSTN

Philadelphia

Wed 7/10

20:25-12:50

1 stop11h 25m

London Stansted

Sun 11/10

06:05-18:55

2 stops17h 50m

£679

PhiladelphiaLondon

PHL - STN

PHLSTN

Philadelphia

Wed 7/10

20:25-19:30

1 stop18h 05m

London Stansted

Tue 13/10

11:35-18:55

1 stop12h 20m

£687

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 30/8

09:12-06:30

1 stop16h 18m

London Heathrow

Wed 23/9

08:40-18:04

1 stop14h 24m

£691

PhiladelphiaLondon

PHL - STN

PHLSTN

Philadelphia

Sat 12/9

20:25-21:20

1 stop19h 55m

London Stansted

Wed 16/9

20:15-18:55

2 stops27h 40m

£692

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 14/8

09:12-06:30

1 stop16h 18m

London Heathrow

Sat 22/8

08:40-20:01

1 stop16h 21m

£695

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sat 15/8

09:00-06:30

1 stop16h 30m

London Heathrow

Sat 22/8

08:40-20:01

1 stop16h 21m

£695
Fastest return journey

PhiladelphiaLondon

PHL - LCY

PHLLCY

Philadelphia

Sun 1/11

21:10-12:40

1 stop10h 30m

London City

Fri 6/11

06:50-14:05

1 stop12h 15m

£699

Flights are sorted by cheapest return flights first.

Deals found on 2/7

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from Philadelphia to London

Have a flexible travel schedule? Discover the best time to fly to London from Philadelphia with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to London

What is the cheapest month to book a flight from Philadelphia to London?

Currently, February is the cheapest month in which you can book a flight from Philadelphia to London (average of £34). Flying from Philadelphia to London in August is currently the most expensive (average of £1,630). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PHL to LON?

Find hourly flight availability from Philadelphia to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 July 2026.

When flying from Philadelphia to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Philadelphia to London

Explore weekly flight availability from Philadelphia to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 6 July 2026.

The most flights from PHL to LON are scheduled on a Monday (15 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (15 on average).

How much does it cost for a return flight from Philadelphia to London?

What’s the top stopover airport for flights from Philadelphia to London?

Share of one-stop return flights from Philadelphia to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Boston (BOS) – chosen by Cheapflights users on 75% of one-stop itineraries from Philadelphia to London on Cheapflights.

What’s the cheapest stopover airport for flights from Philadelphia to London?

Average return fare for one-stop flights from Philadelphia to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Dublin (DUB) is the most affordable one-stop option, with an average return flight price of £439.

What’s the fastest stopover option from Philadelphia to London?

Shortest average travel time for one-stop one-way flights from Philadelphia to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 9h 55m.

Which airport typically offers the quickest stopover for flights from Philadelphia to London?

Average stopover duration for one-stop one-way flights from Philadelphia to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Dublin (DUB) offer the fastest connection on this route, with an average stopover time of 1h 47m.

How far ahead should I book a flight from Philadelphia to London?

The price you pay for your flight from Philadelphia to London may vary depending on when you book. For the best chance of a lower fare, look to book 13 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 6 July 2026.
Read reviews from past customers who have flown with American Airlines,JetBlue, andIberia from Philadelphia to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.1
Good
11,782 reviews
Check prices

Entertainment

6.8

Crew

7.9

Comfort

7.2

Boarding

7.5

Food

6.4

Overall

7.1

Reviews

1 / 20
4.0
Okay

Cameron,Nov 2025

PDX - LHR

The plane was very old...had no WiFi available. The crew were not friendly nor helpful.
American Airlines
7.1
Good
11,782 reviews
American Airlines
7.1
Good
11,782 reviews
Check prices

Entertainment

6.8

Crew

7.9

Comfort

7.2

Boarding

7.5

Food

6.4

Overall

7.1

Reviews

1 / 20
4.0
Okay

Cameron,Nov 2025

PDX - LHR

The plane was very old...had no WiFi available. The crew were not friendly nor helpful.
JetBlue
7.1
Good
3,010 reviews
American Airlines
7.1
Good
11,782 reviews
Check prices

Entertainment

6.8

Crew

7.9

Comfort

7.2

Boarding

7.5

Food

6.4

Overall

7.1

Reviews

1 / 20
4.0
Okay

Cameron,Nov 2025

PDX - LHR

The plane was very old...had no WiFi available. The crew were not friendly nor helpful.
Iberia
7.0
Good
3,247 reviews
American Airlines
7.1
Good
11,782 reviews
Check prices

Entertainment

6.8

Crew

7.9

Comfort

7.2

Boarding

7.5

Food

6.4

Overall

7.1

Reviews

1 / 20
4.0
Okay

Cameron,Nov 2025

PDX - LHR

The plane was very old...had no WiFi available. The crew were not friendly nor helpful.
British Airways
6.7
Okay
8,095 reviews
American Airlines
7.1
Good
11,782 reviews
Check prices

Entertainment

6.8

Crew

7.9

Comfort

7.2

Boarding

7.5

Food

6.4

Overall

7.1

Reviews

1 / 20
4.0
Okay

Cameron,Nov 2025

PDX - LHR

The plane was very old...had no WiFi available. The crew were not friendly nor helpful.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Philadelphia to London?

    Located just 7.0 mi from the city center, Philadelphia is the airport most travelers will use when flying to London from Philadelphia. Booking flights from Philadelphia (PHL) to London should be relatively easy as there are 15 daily outbound flights to London from 2 different airlines.

  • How long is the flight from Philadelphia to London?

    For as low as £669, JetBlue can have you in London from Philadelphia in 16h 18m. There are 3533 mi between Philadelphia and London. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from Philadelphia to London round-trip?

    Flying on British Airways is currently your cheapest option to London, with prices starting at £386. Another option worth looking into is American Airlines, starting at £512 return. British Airways is currently priced 39% below the average price you’ll pay for this route.

  • What are the most popular routes from Philadelphia to London?

    The most popular route from Philadelphia to London is Philadelphia - London Heathrow. You may also consider Philadelphia - London Gatwick or Philadelphia - London City.

  • What are the most reliable airlines from Philadelphia to London?

    Consider Malaysia Airlines (91%), American Airlines (84%) or Finnair (84%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to London.

  • What are the cheapest flights from Philadelphia to London?

    Looking for the cheapest flight from Philadelphia to London? While on average our users pay £812, our data indicates the cheapest price to be £246. The most popular route (Philadelphia - London Heathrow), is priced around £581.

  • Can I find deals for flights from Philadelphia to London that include hotel bookings?

    Yes. In addition to deals on Philadelphia to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to London.

  • Can I find deals for business class flights from Philadelphia to London?

    Yes. Cheapflights offers flight deals from Philadelphia to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Philadelphia to London?

    Currently, February is the cheapest month in which you can book a flight from Philadelphia to London (average of £34). Flying from Philadelphia to London in August is currently the most expensive (average of £1,630). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Milton Keynes
Luton
Wembley
Gatwick
Slough
Croydon
Ilford
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Eastbourne
Southall
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Romford
Borehamwood
Southend-on-Sea
Uxbridge

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Philadelphia to London

Discover the top 2 airlines that operate flights from Philadelphia to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 6 July 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£386Average£669FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£512Average£667FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Philadelphia to London?

Cheapflights makes it easy to find Philadelphia to London flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Philadelphia to London?

Cheapflights simply makes it quick and affordable to book flights from Philadelphia to London by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Philadelphia to London with no change fees?

Certainly. Search results for flights to London from Philadelphia shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Philadelphia to London become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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