OnTimeStats

Historical on-time performance

Phoenix to Salt Lake City

507 miData through May 2026Source: US DOT · BTS

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

On-time rate82%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 5,668 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-time90%
    Medianon time
    p9010 min
    Cancel0.6%
    Flights1,709
  • American Airlines
    On-time86%
    Medianon time
    p9025 min
    Cancel0.4%
    Flights261
  • SkyWest Airlines
    On-time83%
    Medianon time
    p9025 min
    Cancel0.3%
    Flights1,115
  • Frontier Airlines
    On-time81%
    Medianon time
    p9030 min
    Cancel2.1%
    Flights657
  • Envoy Air
    On-time80%
    Medianon time
    p9035 min
    Cancel0.0%
    Flights69
  • Southwest Airlines
    On-time76%
    Medianon time
    p9035 min
    Cancel0.4%
    Flights1,857

Why flights run late

Delay causes

  • Airline40%
  • Weather1%
  • Air traffic (NAS)6%
  • Late aircraft53%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline75%
  • Weather14%
  • Air traffic (NAS)11%
  • Security0%

Most cancellations here are attributed to Airline. Shares are among 36 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 → SLC

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 — 92% on time.

  • Mornings92% on time · p90 5 min · 5,135 flights
  • Middays86% on time · p90 20 min · 3,978 flights
  • Afternoons80% on time · p90 35 min · 2,699 flights
  • Evenings80% on time · p90 35 min · 3,801 flights
  • Overnights72% on time · p90 50 min · 1,627 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 81% to 88% on time.

  • Tuesdays88% on time · p90 15 min · 2,361 flights
  • Wednesdays87% on time · p90 20 min · 2,392 flights
  • Saturdays86% on time · p90 20 min · 2,140 flights
  • Thursdays84% on time · p90 25 min · 2,577 flights
  • Mondays83% on time · p90 30 min · 2,597 flights
  • Fridays82% on time · p90 30 min · 2,621 flights
  • Sundays81% on time · p90 35 min · 2,556 flights

Keep exploring

Related pages

Delay predictorfor this route→PHX airportPhoenix→SLC airportSalt Lake City→Southwest Airlinesairline profile→Delta Air Linesairline profile→SkyWest 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.