OnTimeStats

Historical on-time performance

Greenville to Philadelphia

514 miData through May 2026Source: US DOT · BTS

Flights on GSP–PHL arrive on time 86% of the time over the last 12 months.

On-time rate86%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail risk)
Cancelled2.0%of scheduled flights

based on 444 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • PSA Airlines
    On-time86%
    Medianon time
    p9015 min
    Cancel2.0%
    Flights444

Why flights run late

Delay causes

  • Airline73%
  • Weather3%
  • Air traffic (NAS)11%
  • Late aircraft12%
  • Security0%

Most delay minutes here are attributed to Airline.

When flights don't go

Why flights were cancelled

  • Airline22%
  • Weather78%
  • Air traffic (NAS)0%
  • Security0%

Most cancellations here are attributed to Weather. Shares are among 9 cancellations with a reported cause (BTS reports causes from June 2003).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly GSP → PHL

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 75% to 87% on time.

  • Mornings87% on time · p90 15 min · 1,085 flights
  • Middays87% on time · p90 20 min · 151 flights · limited
  • Evenings75% on time · p90 55 min · 224 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 84% to 87% on time.

  • Thursdays87% on time · p90 20 min · 212 flights
  • Saturdays86% on time · p90 15 min · 199 flights · limited
  • Tuesdays86% on time · p90 15 min · 206 flights
  • Sundays85% on time · p90 15 min · 210 flights
  • Wednesdays85% on time · p90 25 min · 210 flights
  • Mondays84% on time · p90 20 min · 215 flights
  • Fridays84% on time · p90 45 min · 219 flights

Keep exploring

Related pages

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.