OnTimeStats

Historical on-time performance

ONTSLC

Ontario to Salt Lake City

558 miData through Dec 2025Source: US DOT · BTS

Flights on ONT–SLC arrive on time 92% of the time over the last 12 months.

On-time rate92%arrived within 15 min
Median delayon timetypical arrival
p90 delay5 min1 in 10 flights is worsetail risk
Cancelled0.4%of scheduled flights

based on 999 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlinesbest
    On-time96%
    Medianon time
    p90on time
    Cancel0.0%
    Flights140
  • Delta Air Lines
    On-time91%
    Medianon time
    p9010 min
    Cancel0.5%
    Flights859

Why flights run late

Delay causes

  • Airline36%
  • Weather8%
  • Air traffic (NAS)4%
  • Late aircraft51%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

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Keep exploring

Related pages

Delay predictorfor this route→ONT airportOntario→SLC airportSalt Lake City→SkyWest Airlines on this routecarrier detail→SkyWest 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.