OnTimeStats

Historical on-time performance

Houston to Philadelphia

1,324 miData through Dec 2025Source: US DOT · BTS

Flights on IAH–PHL arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.7%of scheduled flights

based on 1,475 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • American Airlines
    On-time74%
    Medianon time
    p9085 min
    Cancel3.4%
    Flights555
  • United Airlinesbest
    On-time81%
    Medianon time
    p9040 min
    Cancel0.6%
    Flights824
  • Spirit Airlines
    On-time67%
    Medianon time
    p9090 min
    Cancel3.3%
    Flights30
  • PSA Airlines
    On-time70%
    Medianon time
    p9040 min
    Cancel0.0%
    Flights66

Why flights run late

Delay causes

  • Airline46%
  • Weather4%
  • Air traffic (NAS)12%
  • Late aircraft38%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly IAH → PHL

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

Best time of day

Mornings are the most reliable time of day to fly this route — 88% on time.

  • Mornings88% on time · p90 15 min · 2,405 flights
  • Middays75% on time · p90 60 min · 1,515 flights
  • Evenings69% on time · p90 75 min · 1,156 flights
  • Afternoons63% on time · p90 125 min · 376 flights
  • Overnights48% on time · p90 130 min · 54 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 76% to 81% on time.

  • Tuesdays81% on time · p90 40 min · 717 flights
  • Wednesdays81% on time · p90 40 min · 765 flights
  • Saturdays79% on time · p90 50 min · 648 flights
  • Thursdays79% on time · p90 50 min · 850 flights
  • Fridays78% on time · p90 50 min · 849 flights
  • Sundays76% on time · p90 60 min · 817 flights
  • Mondays76% on time · p90 60 min · 860 flights
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Keep exploring

Related pages

Delay predictorfor this route→IAH airportHouston→PHL airportPhiladelphia→Mesa Airlines on this routecarrier detail→Mesa Airlinesairline profile→

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.