OnTimeStats

Historical on-time performance

Phoenix to Washington

1,956 miData through Dec 2025Source: US DOT · BTS

Flights on PHX–IAD arrive on time 82% of the time over the last 12 months.

On-time rate82%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights

based on 1,153 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • United Airlinesbest
    On-time84%
    Medianon time
    p9020 min
    Cancel0.5%
    Flights847
  • Southwest Airlines
    On-time77%
    Medianon time
    p9030 min
    Cancel0.0%
    Flights306

Why flights run late

Delay causes

  • Airline46%
  • Weather2%
  • Air traffic (NAS)23%
  • Late aircraft26%
  • Security3%

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 PHX → IAD

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

Best time of day

On-time rates are fairly even by time of day on this route — ranging from 82% to 86% on time.

  • Afternoons86% on time · p90 20 min · 359 flights
  • Overnights85% on time · p90 20 min · 732 flights
  • Mornings83% on time · p90 20 min · 1,312 flights
  • Middays82% on time · p90 25 min · 466 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 80% to 87% on time.

  • Mondays87% on time · p90 15 min · 418 flights
  • Tuesdays86% on time · p90 15 min · 392 flights
  • Saturdays86% on time · p90 20 min · 412 flights
  • Wednesdays85% on time · p90 25 min · 396 flights
  • Fridays82% on time · p90 25 min · 421 flights
  • Thursdays81% on time · p90 25 min · 414 flights
  • Sundays80% on time · p90 25 min · 424 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.