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

Flying on Iberia is currently your cheapest option to London, with prices starting at £497. Additional return tickets that might be worth considering are offered by JetBlue and Aer Lingus, with the lowest prices starting at £500 and £501, respectively. Iberia is currently priced 21% below the average price you’ll pay for this route.

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

The cheapet airlines for a one-way flight from Philadelphia to London are JetBlue (£227), Aer Lingus (£339), and Iberia (£346).

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

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

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 cheapest flights from Philadelphia to London?

Looking for the cheapest flight from Philadelphia to London? While on average our users pay £3,050, our data indicates the cheapest price to be £372. The most popular route (Philadelphia - London Heathrow), is priced around £459.

What are the most reliable airlines from Philadelphia to London?

Consider Malaysia Airlines (77%), American Airlines (75%) or Finnair (75%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to London.

What are the most popular airlines that fly from Philadelphia to London?

When booking a flight from Philadelphia to London, you may want to consider flying on JetBlue, British Airways or Aer Lingus as they are the most popular for this route.

What is the cheapest day to fly round-trip from Philadelphia to London?

Wednesday flights are generally found to be more expensive for flights from Philadelphia to London. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London.

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

Travelers have found it’s best to book a flight 50 days in advance to save up to 18% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 50 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Philadelphia to London 1-2 weeks in advance for as low as £525, or £619 for flights within the next 24 hours.

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

February can be a great time to fly to London from Philadelphia with a flight ticket averaging about £636. Cheapflights users have found deals in the month of February for as cheap as £430. The most expensive prices can be found in the month of June.

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 7 daily outbound flights to London from 4 different airlines.

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.

£161+ Flights from Philadelphia to London

Cheapflights Tip: The best prices from Philadelphia to London are usually found in February or October, booked 49 days in advance, depart on a Tuesday or Friday and return on a Tuesday

Cheap flight deals from Philadelphia to London

Round-trip from	£497
One-way from	£170
Popular in	June
Cheapest in	February
Average price	£569
Good round-trip deal	£547 or less
Good one-way deal	£572 or less

Iberia
27/8-5/9
Nonstop
15h 10m total
Philadelphia to London

Search Deals

16/7
1 total stop
32h 24m total
Philadelphia to London

Search Deals

Highest demand for flights based on searches. 19% potential increase in price (£117 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).

Search Deals

Average for round-trip flights in March 2025

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

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 25 March 2025.

Wed 27/819:40PHL - LHR

Nonstop7h 15mIberia

Fri 5/913:25LHR - PHL

Nonstop7h 55mIberia

Deal found 23/3£497

Wed 26/310:11PHL - LHR

1 stop15h 44mJetBlue

Wed 2/408:25LHR - PHL

1 stop17h 15mJetBlue

Deal found 25/3£499

Mon 12/507:35PHL - LGW

3 stops26h 00mMultiple Airlines

Wed 14/510:00LGW - PHL

1 stop31h 52mMultiple Airlines

Deal found 24/3£500

Sat 13/917:15PHL - LGW

1 stop11h 20mJetBlue

Sat 27/912:10LGW - PHL

1 stop11h 32mJetBlue

Deal found 25/3£500

Sun 27/420:30PHL - LHR

1 stop11h 10mAer Lingus

Wed 7/512:00LHR - PHL

1 stop12h 00mAer Lingus

Deal found 23/3£501

Wed 20/815:30PHL - LHR

1 stop10h 50mBritish Airways

Mon 25/808:25LHR - PHL

1 stop10h 35mBritish Airways

Deal found 24/3£507

Wed 1/1009:15PHL - LHR

1 stop16h 15mUnited Airlines

Tue 7/1013:30LHR - PHL

2 stops13h 57mUnited Airlines

Deal found 24/3£508

Wed 27/819:40PHL - LHR

Nonstop7h 15mFinnair

Fri 5/907:15LHR - PHL

1 stop14h 10mFinnair

Deal found 24/3£509

Tue 22/411:15PHL - LGW

1 stop14h 20mBritish Airways

Wed 14/514:30LGW - PHL

1 stop24h 11mBritish Airways

Deal found 24/3£510

Mon 7/416:25PHL - LHR

2 stops12h 35mMultiple Airlines

Tue 15/406:00LHR - PHL

2 stops16h 25mMultiple Airlines

Deal found 24/3£511

Wed 1/1015:30PHL - LHR

1 stop11h 20mAmerican Airlines

Tue 7/1008:55LHR - PHL

1 stop12h 45mAmerican Airlines

Deal found 24/3£514

Mon 7/415:30PHL - LHR

1 stop13h 30mAir Canada

Tue 15/408:45LHR - PHL

2 stops18h 48mAir Canada

Deal found 24/3£519

Best flights from Philadelphia to London
Discover carefully curated flight deals from Philadelphia to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 March 2025.

Wed 27/819:40PHL - LHR

Nonstop7h 15mIberia

Fri 5/913:25LHR - PHL

Nonstop7h 55mIberia

Deal found 23/3£497

Mon 12/507:35PHL - LGW

3 stops26h 00mMultiple Airlines

Wed 14/510:00LGW - PHL

1 stop31h 52mMultiple Airlines

Deal found 24/3£500

Sat 13/917:15PHL - LGW

1 stop11h 20mJetBlue

Sat 27/912:10LGW - PHL

1 stop11h 32mJetBlue

Deal found 25/3£500

Sun 27/420:30PHL - LHR

1 stop11h 10mAer Lingus

Wed 7/512:00LHR - PHL

1 stop12h 00mAer Lingus

Deal found 23/3£501

Wed 20/815:30PHL - LHR

1 stop10h 50mBritish Airways

Tue 26/809:15LHR - PHL

1 stop9h 45mBritish Airways

Deal found 24/3£507

Wed 27/819:40PHL - LHR

Nonstop7h 15mFinnair

Fri 5/907:15LHR - PHL

1 stop14h 10mFinnair

Deal found 24/3£509

Mon 21/419:55PHL - LHR

Nonstop7h 10mAmerican Airlines

Wed 30/407:50LHR - PHL

1 stop13h 05mAmerican Airlines

Deal found 24/3£513

Tue 22/415:30PHL - LHR

1 stop13h 30mUnited Airlines

Tue 29/414:05LHR - PHL

2 stops29h 13mUnited Airlines

Deal found 24/3£518

Mon 7/415:30PHL - LHR

1 stop13h 30mAir Canada

Tue 15/408:45LHR - PHL

2 stops18h 48mAir Canada

Deal found 24/3£519

Wed 7/508:00PHL - LHR

1 stop17h 45mDelta

Wed 14/506:30LHR - PHL

2 stops17h 44mDelta

Deal found 24/3£531

Tue 20/510:45PHL - LHR

1 stop15h 00mVirgin Atlantic

Thu 29/506:15LHR - PHL

2 stops16h 02mVirgin Atlantic

Deal found 24/3£537

Tue 22/417:35PHL - LCY

1 stop17h 50mLufthansa

Wed 14/508:45LCY - PHL

1 stop12h 15mLufthansa

Deal found 24/3£554

Direct flights from Philadelphia to London
Explore direct flight options from Philadelphia to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 March 2025.

Wed 27/819:40PHL - LHR

Nonstop7h 15mIberia

Fri 5/913:25LHR - PHL

Nonstop7h 55mIberia

Deal found 23/3£497

Sun 27/419:55PHL - LHR

Nonstop7h 10mBritish Airways

Wed 7/512:30LHR - PHL

Nonstop7h 45mBritish Airways

Deal found 23/3£513

Mon 7/422:10PHL - LHR

Nonstop7h 10mFinnair

Tue 15/412:30LHR - PHL

Nonstop7h 45mFinnair

Deal found 24/3£520

Sun 11/522:10PHL - LHR

Nonstop7h 10mAmerican Airlines

Sun 25/510:05LHR - PHL

Nonstop7h 45mAmerican Airlines

Deal found 25/3£533

Fri 11/419:55PHL - LHR

Nonstop7h 10mMultiple Airlines

Wed 16/412:30LHR - PHL

Nonstop7h 45mMultiple Airlines

Deal found 24/3£683

Last-minute flights from Philadelphia to London
Discover last-minute flight deals from Philadelphia to London. Data last updated 25 March 2025 and is based on user searches.

Wed 26/310:11PHL - LHR

1 stop15h 44mJetBlue

Wed 2/408:25LHR - PHL

1 stop17h 15mJetBlue

Deal found 25/3£499

Mon 31/311:08PHL - LHR

3 stops25h 32mMultiple Airlines

Mon 7/407:05LHR - PHL

3 stops32h 08mMultiple Airlines

Deal found 24/3£594

Mon 31/315:58PHL - LHR

2 stops21h 32mScandinavian Airlines

Mon 7/421:05LHR - PHL

3 stops29h 19mScandinavian Airlines

Deal found 24/3£639

Tue 1/406:55PHL - LGW

2 stops22h 05mMultiple Airlines

Wed 9/421:20LGW - PHL

2 stops36h 46mMultiple Airlines

Deal found 23/3£509

Tue 1/416:25PHL - STN

2 stops16h 55mMultiple Airlines

Tue 8/422:35STN - PHL

2 stops22h 08mMultiple Airlines

Deal found 25/3£534

Tue 1/416:25PHL - LTN

2 stops15h 10mMultiple Airlines

Tue 8/421:50LTN - PHL

2 stops22h 53mMultiple Airlines

Deal found 25/3£536

Tue 1/417:37PHL - LHR

2 stops19h 08mTAP AIR PORTUGAL

Wed 9/408:25LHR - PHL

1 stop17h 17mTAP AIR PORTUGAL

Deal found 23/3£671

Tue 1/420:30PHL - LCY

1 stop11h 15mMultiple Airlines

Tue 8/406:45LCY - PHL

2 stops18h 57mMultiple Airlines

Deal found 25/3£902

Wed 2/408:25PHL - LHR

1 stop17h 05mJetBlue

Wed 16/408:25LHR - PHL

1 stop13h 27mJetBlue

Deal found 25/3£504

Wed 2/420:30PHL - LHR

1 stop11h 55mAer Lingus

Tue 8/408:50LHR - PHL

2 stops16h 52mAer Lingus

Deal found 24/3£654

Wed 2/408:25PHL - LGW

2 stops20h 20mTAP AIR PORTUGAL

Tue 8/410:35LGW - PHL

2 stops26h 04mTAP AIR PORTUGAL

Deal found 24/3£805

Thu 3/408:25PHL - LHR

2 stops31h 20mIcelandair

Thu 10/408:25LHR - PHL

1 stop28h 14mIcelandair

Deal found 23/3£500

One-way flights from Philadelphia to London
Search for one-way flight options from Philadelphia to London. Find affordable one-way fares based on user searches. Data last updated 25 March 2025.

Wed 16/717:36PHL - LGW

1 stop32h 24mMultiple Airlines

Deal found 24/3£170

Wed 16/717:36PHL - LHR

2 stops23h 24mMultiple Airlines

Deal found 24/3£218

Fri 25/408:34PHL - LHR

1 stop16h 56mJetBlue

Deal found 24/3£227

Mon 14/407:00PHL - STN

3 stops31h 00mMultiple Airlines

Deal found 24/3£300

Mon 14/407:00PHL - LTN

3 stops33h 45mMultiple Airlines

Deal found 24/3£308

Wed 16/714:24PHL - LCY

3 stops23h 01mMultiple Airlines

Deal found 24/3£333

Tue 22/408:25PHL - LHR

2 stops19h 40mAer Lingus

Deal found 24/3£339

Thu 31/718:35PHL - LGW

1 stop10h 00mJetBlue

Deal found 25/3£339

Sat 19/718:30PHL - LHR

Nonstop7h 10mIberia

Deal found 24/3£346

Sun 24/813:15PHL - LHR

2 stops15h 05mScandinavian Airlines

Deal found 24/3£357

Sat 19/715:20PHL - LHR

2 stops12h 15mAir Canada

Deal found 24/3£359

Mon 21/710:25PHL - LGW

2 stops18h 20mTAP AIR PORTUGAL

Deal found 24/3£362

Cheapflights Fare Finder

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

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 27/8

19:40-07:55

Nonstop7h 15m

London Heathrow

Fri 5/9

13:25-16:20

Nonstop7h 55m

£497

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

Mon 12/5

07:35-14:35

3 stops26h 00m

London Gatwick

Wed 14/5

10:00-12:52

1 stop31h 52m

£500

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

Sat 13/9

17:15-09:35

1 stop11h 20m

London Gatwick

Sat 27/9

12:10-18:42

1 stop11h 32m

£500

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Sun 27/4

20:30-12:40

1 stop11h 10m

London Heathrow

Wed 7/5

12:00-19:00

1 stop12h 00m

£501

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Fri 4/4

08:25-06:30

1 stop17h 05m

London Heathrow

Tue 22/4

08:25-21:15

1 stop17h 50m

£504

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 20/8

15:30-07:20

1 stop10h 50m

London Heathrow

Mon 25/8

08:25-14:00

1 stop10h 35m

£507

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Wed 27/8

19:40-07:55

Nonstop7h 15m

London Heathrow

Fri 5/9

07:15-16:25

1 stop14h 10m

£509

PhiladelphiaLondon

PHL - LGW

PHLLGW

Philadelphia

Tue 22/4

11:15-06:35

1 stop14h 20m

London Gatwick

Wed 14/5

14:30-09:41

1 stop24h 11m

£510

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 7/4

16:25-10:00

2 stops12h 35m

London Heathrow

Tue 15/4

06:00-17:25

2 stops16h 25m

£511

PhiladelphiaLondon

PHL - LHR

PHLLHR

Philadelphia

Mon 21/4

19:55-08:05

Nonstop7h 10m

London Heathrow

Wed 30/4

07:50-15:55

1 stop13h 05m

£513

Flights are sorted by cheapest return flights first.

Deals found on 23/3

Showing 1-10 of 57 results

...

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

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 49 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Philadelphia to London (average of £112). Flying from Philadelphia to London in August is currently the most expensive (average of £164). 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?

Unlike at midday, when flights are generally more expensive, you can save up to 33% on flights from Philadelphia to London by exploring options for tickets in the morning.

Rainfall in London by month

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

Temperature in London by month

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Reviews of airlines servicing London

Get a feel of what it's like to fly with Delta, KLM and Finnair from Philadelphia to London by reading reviews from past customers. 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.

Delta

8.0

Very Good

7,890 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very Good

7,890 reviews

Delta

8.0

Very Good

7,890 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,318 reviews

Delta

8.0

Very Good

7,890 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,266 reviews

Delta

8.0

Very Good

7,890 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS

7.5

Good

1,569 reviews

Delta

8.0

Very Good

7,890 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

8,605 reviews

Delta

8.0

Very Good

7,890 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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 7 daily outbound flights to London from 4 different airlines.
What are the cheapest airlines flying from Philadelphia to London round-trip?
Flying on Iberia is currently your cheapest option to London, with prices starting at £497. Additional return tickets that might be worth considering are offered by JetBlue and Aer Lingus, with the lowest prices starting at £500 and £501, respectively. Iberia is currently priced 21% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from Philadelphia to London one-way?
The cheapet airlines for a one-way flight from Philadelphia to London are JetBlue (£227), Aer Lingus (£339), and Iberia (£346).
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 (77%), American Airlines (75%) or Finnair (75%) 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 £3,050, our data indicates the cheapest price to be £372. The most popular route (Philadelphia - London Heathrow), is priced around £459.
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, January is the cheapest month in which you can book a flight from Philadelphia to London (average of £112). Flying from Philadelphia to London in August is currently the most expensive (average of £164). 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

Hounslow

Deal

Milton Keynes

Gatwick

Croydon

Luton

Slough

Eastbourne

Wembley

Hayes

Ilford

Crawley

Southend-on-Sea

Winchester

Maidstone

Ipswich

Watford

Southall

Dartford

Folkestone

Browse thousands of different options on Cheapflights for your next trip

Top 4 airlines flying from Philadelphia to London

Airline	Cheapest	Average	Flexibility	On-time
Iberia	Cheapest£451	Average£601	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
JetBlue	Cheapest£469	Average£544	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights
British Airways	Cheapest£474	Average£600	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Aer Lingus	Cheapest£510	Average£590	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights

Fly with Cheapflights

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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Philadelphia to London from £161

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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Philadelphia to London are usually found in February or October, booked 49 days in advance, depart on a Tuesday or Friday and return on a Tuesday

Cheap flight deals from Philadelphia to London

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Philadelphia to London

Cheapest flights from Philadelphia to LondonExplore 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 25 March 2025.

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 25 March 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Philadelphia to London that are best for you.

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.

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 return flight from Philadelphia to London. Price data was last updated on 21 March 2025.

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

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 25 March 2025.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

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 25 March 2025.

Get a feel of what it's like to fly with Delta, KLM and Finnair from Philadelphia to London by reading reviews from past customers. 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.

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?

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

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

What are the most popular routes from Philadelphia to London?

What are the most reliable airlines from Philadelphia to London?

What are the cheapest flights from Philadelphia to London?

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

How can I find direct flights from Philadelphia to London?

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

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

Travelling to a place near Philadelphia?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Philadelphia to London

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Philadelphia to London

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?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 25 March 2025.