OnTimeStats

Historical on-time performance

Seattle to Phoenix

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

Flights on SEA–PHX arrive on time 78% of the time over the last 12 months.

On-time rate78%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 6,962 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.

  • American Airlines
    On-time95%
    Medianon time
    p90on time
    Cancel0.0%
    Flights61
  • Envoy Air
    On-time84%
    Medianon time
    p9020 min
    Cancel0.0%
    Flights631
  • Delta Air Lines
    On-time82%
    Medianon time
    p9030 min
    Cancel0.9%
    Flights1,765
  • SkyWest Airlines
    On-time81%
    Medianon time
    p9030 min
    Cancel0.6%
    Flights540
  • Alaska Airlines
    On-time77%
    Medianon time
    p9030 min
    Cancel0.6%
    Flights2,930
  • Southwest Airlines
    On-time70%
    Medianon time
    p9045 min
    Cancel0.7%
    Flights1,035

Why flights run late

Delay causes

  • Airline45%
  • Weather1%
  • Air traffic (NAS)19%
  • Late aircraft34%
  • Security0%

Most delay minutes here are attributed to Airline.

When flights don't go

Why flights were cancelled

  • Airline61%
  • Weather27%
  • Air traffic (NAS)11%
  • Security0%

Most cancellations here are attributed to Airline. Shares are among 44 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 SEA → PHX

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 — 88% on time.

  • Mornings88% on time · p90 15 min · 6,741 flights
  • Middays77% on time · p90 35 min · 5,681 flights
  • Afternoons76% on time · p90 30 min · 3,621 flights
  • Evenings74% on time · p90 40 min · 4,240 flights
  • Overnights70% on time · p90 50 min · 1,441 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 77% to 83% on time.

  • Tuesdays83% on time · p90 25 min · 2,969 flights
  • Wednesdays82% on time · p90 30 min · 2,982 flights
  • Saturdays81% on time · p90 30 min · 2,965 flights
  • Sundays78% on time · p90 35 min · 3,180 flights
  • Mondays77% on time · p90 30 min · 3,208 flights
  • Thursdays77% on time · p90 30 min · 3,205 flights
  • Fridays77% on time · p90 35 min · 3,215 flights

Keep exploring

Related pages

Delay predictorfor this route→SEA airportSeattle→PHX airportPhoenix→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.