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$406+ Cheap flights from Philadelphia (PHL) to London (LON)

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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — LON
ago. 4 — ago. 111
lun. 8/4
lun. 8/11
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to London are usually found in February or October, booked 72 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap 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 julio 30, 2025.

Round-trip from

$505
(Cheapflightsfares)

One-way from

$405
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$946

Good round-trip deal

$625 or less

Good one-way deal

$481 or less
From Philadelphia to London (LON)
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One-way flight from Philadelphia to London (LON)
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Highest demand for flights based on searches. 19% potential increase in price ($188 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Philadelphia to London (LON).
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Price to beat on a one-way flight from Philadelphia to London (LON).
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Find flight deals from Philadelphia to London

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 julio 30, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/93:40 pmPHL - LHR
1 stop11h 10mBritish Airways
jue. 10/2310:05 amLHR - PHL
Nonstop8h 00mBritish Airways
Deal found 7/30$505
This Norse deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Norse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/65:30 amPHL - LGW
1 stop23h 30mMultiple Airlines
mié. 10/82:00 pmLGW - PHL
1 stop14h 59mMultiple Airlines
Deal found 7/28$506
This Iberia deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/267:50 pmPHL - LHR
Nonstop7h 15mIberia
mar. 9/237:10 pmLHR - PHL
1 stop25h 45mIberia
Deal found 7/28$507
This Iberia deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/261:57 pmPHL - LGW
2 stops16h 53mIberia
mar. 11/2511:20 amLGW - PHL
1 stop32h 00mIberia
Deal found 7/29$507
This United Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/286:30 amPHL - LHR
1 stop24h 15mUnited Airlines
mié. 10/82:05 pmLHR - PHL
1 stop29h 33mUnited Airlines
Deal found 7/29$508
This oojo deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/119:15 pmPHL - LGW
1 stop20h 50mBritish Airways
lun. 9/14:05 pmLGW - PHL
1 stop29h 10mBritish Airways
Deal found 7/28$508
This Air Canada deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/119:20 amPHL - LHR
1 stop19h 40mAir Canada
lun. 9/111:05 amLHR - PHL
2 stops40h 03mAir Canada
Deal found 7/29$519
This oojo deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/106:50 pmPHL - LCY
1 stop12h 55mBritish Airways
mié. 9/178:30 pmLCY - PHL
1 stop20h 15mBritish Airways
Deal found 7/30$521
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/166:41 pmPHL - LHR
1 stop31h 34mDelta
mar. 9/29:00 amLHR - PHL
2 stops18h 20mDelta
Deal found 7/29$523
This Booking.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/18:30 pmPHL - LHR
1 stop11h 10mAer Lingus
lun. 9/89:50 amLHR - PHL
1 stop14h 10mAer Lingus
Deal found 7/30$525
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/176:30 pmPHL - LHR
Nonstop7h 10mAmerican Airlines
vie. 10/317:50 amLHR - PHL
1 stop10h 55mAmerican Airlines
Deal found 7/30$534
This Gotogate deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/97:30 amPHL - LHR
2 stops18h 00mMultiple Airlines
lun. 9/156:50 amLHR - PHL
2 stops12h 48mMultiple Airlines
Deal found 7/29$540

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated julio 30, 2025.
Use the filters below to find and compare flights from Philadelphia to London that are best for you.

Fly from

Philadelphia

Fly to

London

Route

Depart

Return

Price

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

mar. 9/9

3:40 pm-7:50 am

1 stop11h 10m

London Heathrow

jue. 10/23

10:05 am-1:05 pm

Nonstop8h 00m

$505

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

mar. 10/21

6:30 pm-6:40 am

Nonstop7h 10m

London Heathrow

lun. 11/24

11:25 am-3:35 pm

1 stop33h 10m

$506

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

lun. 10/6

5:30 am-10:00 am

1 stop23h 30m

London Gatwick

mié. 10/8

2:00 pm-11:59 pm

1 stop14h 59m

$506

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

dom. 10/26

1:57 pm-10:50 am

2 stops16h 53m

London Gatwick

mar. 11/25

11:20 am-2:20 pm

1 stop32h 00m

$507

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

dom. 9/28

6:30 am-11:45 am

1 stop24h 15m

London Heathrow

mié. 10/8

2:05 pm-2:38 pm

1 stop29h 33m

$508

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

lun. 8/11

9:15 pm-11:05 pm

1 stop20h 50m

London Gatwick

lun. 9/1

4:05 pm-4:15 pm

1 stop29h 10m

$508

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

lun. 8/11

9:20 am-10:00 am

1 stop19h 40m

London Heathrow

lun. 9/1

11:05 am-10:08 pm

2 stops40h 03m

$519

PhiladelphiaLondon

PHL - LCY

PHLLCY

Philadelphia

mié. 9/10

6:50 pm-12:45 pm

1 stop12h 55m

London City

mié. 9/17

8:30 pm-11:45 am

1 stop20h 15m

$521

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

sáb. 8/16

6:41 pm-7:15 am

1 stop31h 34m

London Heathrow

mar. 9/2

9:00 am-10:20 pm

2 stops18h 20m

$523

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

lun. 9/1

8:30 pm-12:40 pm

1 stop11h 10m

London Heathrow

lun. 9/8

9:50 am-7:00 pm

1 stop14h 10m

$525

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 46 results
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The best insider tips for Philadelphia to London flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to London trip
Airports
PHL

For quick access to Center City, SEPTA's Airport Line is efficient and operates from 5:00 a.m. to midnight.

Read more about PHLby Mark Chesnut
LHR

Take the Heathrow Express to Paddington for the fastest route into central London.

Read more about LHRby Ramsey Qubein
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut

Mark Chesnut

Mark Chesnut is a travel writer and public speaker with more than 30 years of experience. The 2019 winner of the NLGJA Excellence in Travel Writing Award, Mark is the author of the book “Prepare for Departure” and has covered air travel for multiple top consumer and trade media outlets.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

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 round-trip 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

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

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to London. Price data was last updated on July 25, 2025.

Booking 72 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, November is the cheapest month in which you can book a flight from Philadelphia to London (average of $661). Flying from Philadelphia to London in June is currently the most expensive (average of $1,097). 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 julio 30, 2025.

A simple way to save on the total cost of your ticket is to fly from Philadelphia to London at noon. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from Philadelphia to London?

Use this chart to determine the cheapest time to fly round-trip from Philadelphia to London. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Philadelphia to London flight should consider departing on Tuesday mornings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 julio 30, 2025.

The most flights from PHL to LON are scheduled on a Monday (15 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (10 on average).

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 julio 30, 2025.
See what other customers who have flown with Delta, SWISS, and United Airlines from Philadelphia to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,686 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Scandinavian Airlines
7.3
Good
1,453 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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?

    If you book a flight to London from Philadelphia, you will be flying from Philadelphia, which is the city’s only airport. Philadelphia (PHL) is located 7.0 mi from the center of Philadelphia. There are 12 flights from Philadelphia to London per day from 8 different airlines.

  • 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 $505. Additional round-trip tickets that might be worth considering are offered by Iberia and United Airlines, with the lowest prices starting at $507 and $508, respectively. These flights start at 36% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Philadelphia to London one-way?

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as $406. Users have also found prices from $408 and $410 on JetBlue and Iberia, respectively.

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

    Most travelers choose Philadelphia - London Heathrow, Philadelphia - London Gatwick or Philadelphia - London City when deciding on the best route from Philadelphia to London.

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

    The top 3 most reliable airlines when flying from Philadelphia to London are Aer Lingus (83%), American Airlines (79%) and Finnair (79%).

  • What are the cheapest flights from Philadelphia to London?

    On average you can expect to pay $2,029 for a flight from Philadelphia to London. The cheapest flight overall is $414 while the most popular route, (Philadelphia - London Heathrow) is currently priced at $466.

  • Where are the most common layover locations when flying from Philadelphia to London?

    The most popular layover on flights from Philadelphia to London is Dublin.

  • What are some popular things to do or see while on a layover in Dublin?

    The majority of Dublin visitors spend their time at Molly Malone Statue, St. Patrick's Cathedral, and Parnell Square. Molly Malone Statue, St. Patrick's Cathedral, and Parnell Square are located about 5.8 mi, 6.1 mi, and 5.0 mi, respectively from Dublin. Travelers can book a car rental at Dublin for about $26 per day to make their sightseeing more efficient.

  • Where are the least popular layover locations for Philadelphia to London flights?

    Philadelphia to London flights that have layovers will least frequently stop in Boston.

  • 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 vacation 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, November is the cheapest month in which you can book a flight from Philadelphia to London (average of $661). Flying from Philadelphia to London in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Orpington
Watford
Gatwick
Borehamwood
Dartford
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Arundel
Milton Keynes
Bishop's Stortford
Eastbourne

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Alternative routes for Philadelphia to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Philadelphia to London

Discover the top 8 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 2,558,603 searches. Data last updated julio 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$507Average$637FlexibilityNo cancel feeOn-time62%
Air CanadaCheapest$556Average$807FlexibilityNo cancel feeOn-time67%
British AirwaysCheapest$560Average$746FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$570Average$800FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$609Average$773FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$615Average$867FlexibilityNo cancel feeOn-time71%
FinnairCheapest$635Average$799FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$673Average$936FlexibilityNo cancel feeOn-time69%

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