How often are flights between London and Philadelphia on time?

77.2% of 1,856 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 2.9% were cancelled.

Which airline is most punctual between London and Philadelphia?

American Airlines, with 78% on time. British Airways was the least punctual at 76%.

LHR to PNE

London to Philadelphia flights

Name: London to Philadelphia (LHR-PNE) flights: on-time record
Creator: TripStow
License: https://tripstow.com/notices

Flights from London Heathrow (LHR) to Philadelphia (PNE) cover 5,660 km. 1,856 flights flew between them in the last 12 months of UK Civil Aviation Authority figures; 77% were on time across 2 airlines.

1,856

flights, August 2025 to July 2026

77%

on time (within 15 min)

2.9%

cancelled

+15 min

average delay

Both directions together. On time means within 15 minutes of schedule, counted over every scheduled flight to and from the UK airport, including cancelled ones (the CAA's definition).

Airlines on this route

Airline	Flights	On time	Cancelled	Average delay
American Airlines	1,139	78%	3.3%	16 min
British Airways	717	76%	2.2%	13 min

Month by month

Over the last 12 months, London and Philadelphia ran best in March 2026 (89.1% on time) and worst in January 2026 (64.4%).

Share of flights on time, by month (UK Civil Aviation Authority). Green is the best month, orange the worst.

See the figures

Month	On time	Cancelled	Flights
August 2025	68%	6%	182
September 2025	74%	2.2%	180
October 2025	79%	1.1%	174
November 2025	79%	0%	121
December 2025	81%	4.1%	122
January 2026	64%	10.2%	118
February 2026	82%	7.7%	104
March 2026	89%	1.6%	128
April 2026	85%	1.1%	180
May 2026	84%	0%	187
June 2026	70%	2.2%	178
July 2026	74%	2.2%	182

Source: UK Civil Aviation Authority punctuality statistics, August 2025 to July 2026. Contains UK Civil Aviation Authority data. Figures describe the past and do not predict a future flight.

Questions and answers

How often are flights between London and Philadelphia on time?: 77.2% of 1,856 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 2.9% were cancelled.
Which airline is most punctual between London and Philadelphia?: American Airlines, with 78% on time. British Airways was the least punctual at 76%.
What is the best month to fly between London and Philadelphia?: Over the last 12 months, London and Philadelphia ran best in March 2026 (89.1% on time) and worst in January 2026 (64.4%).

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