OnTimeStats

Historical on-time performance

San Francisco to Philadelphia

2,521 miData through Dec 2025Source: US DOT · BTS

Flights on SFO–PHL arrive on time 84% of the time over the last 12 months.

On-time rate84%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights

based on 1,771 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • American Airlines
    On-time82%
    Medianon time
    p9025 min
    Cancel1.0%
    Flights1,168
  • United Airlinesbest
    On-time88%
    Medianon time
    p9015 min
    Cancel0.0%
    Flights603

Why flights run late

Delay causes

  • Airline31%
  • Weather0%
  • Air traffic (NAS)17%
  • Late aircraft52%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly SFO → PHL

All airlines · rolling 36 months (2023-01 .. 2025-12).

Best time of day

Afternoons are the most reliable time of day to fly this route — 92% on time.

  • Afternoons92% on time · p90 5 min · 83 flights · limited
  • Overnights83% on time · p90 20 min · 1,743 flights
  • Mornings83% on time · p90 25 min · 1,926 flights
  • Early mornings80% on time · p90 25 min · 104 flights · limited
  • Middays74% on time · p90 35 min · 719 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 80% to 84% on time.

  • Wednesdays84% on time · p90 20 min · 639 flights
  • Tuesdays83% on time · p90 20 min · 629 flights
  • Fridays83% on time · p90 25 min · 672 flights
  • Mondays82% on time · p90 25 min · 679 flights
  • Saturdays81% on time · p90 25 min · 611 flights
  • Thursdays80% on time · p90 25 min · 666 flights
  • Sundays80% on time · p90 30 min · 679 flights
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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.