OnTimeStats

Historical on-time performance

Phoenix to Seattle

1,107 miData through May 2026Source: US DOT · BTS

Flights on PHX–SEA 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)
Cancelled0.6%of scheduled flights

based on 6,989 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Too close to call — no single carrier is clearly more on-time here.

  • Delta Air Lines
    On-time87%
    Medianon time
    p9015 min
    Cancel0.9%
    Flights1,764
  • Envoy Air
    On-time86%
    Medianon time
    p9020 min
    Cancel0.0%
    Flights632
  • Alaska Airlines
    On-time84%
    Medianon time
    p9025 min
    Cancel0.7%
    Flights2,926
  • American Airlines
    On-time84%
    Medianon time
    p9015 min
    Cancel0.0%
    Flights91
  • SkyWest Airlines
    On-time82%
    Medianon time
    p9030 min
    Cancel0.6%
    Flights540
  • Southwest Airlines
    On-time66%
    Medianon time
    p9045 min
    Cancel0.5%
    Flights1,036

Why flights run late

Delay causes

  • Airline32%
  • Weather4%
  • Air traffic (NAS)16%
  • Late aircraft47%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline67%
  • Weather24%
  • Air traffic (NAS)9%
  • Security0%

Most cancellations here are attributed to Airline. Shares are among 45 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 PHX → SEA

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

Best time of day

Mornings are the most reliable time of day to fly this route — 87% on time.

  • Mornings87% on time · p90 15 min · 6,832 flights
  • Middays85% on time · p90 20 min · 5,450 flights
  • Afternoons80% on time · p90 30 min · 3,794 flights
  • Evenings76% on time · p90 40 min · 3,847 flights
  • Overnights76% on time · p90 40 min · 1,786 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 80% to 85% on time.

  • Tuesdays85% on time · p90 20 min · 2,950 flights
  • Wednesdays84% on time · p90 25 min · 2,990 flights
  • Saturdays84% on time · p90 25 min · 2,970 flights
  • Thursdays82% on time · p90 25 min · 3,207 flights
  • Sundays81% on time · p90 25 min · 3,159 flights
  • Mondays81% on time · p90 30 min · 3,213 flights
  • Fridays80% on time · p90 30 min · 3,221 flights

Keep exploring

Related pages

Delay predictorfor this route→PHX airportPhoenix→SEA airportSeattle→Alaska Airlinesairline profile→Delta Air Linesairline profile→Southwest Airlinesairline profile→Seasonal delay patternsguide→

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.