OnTimeStats

Historical on-time performance

Salt Lake City to Ontario

558 miData through Dec 2025Source: US DOT · BTS

Flights on SLC–ONT arrive on time 88% of the time over the last 12 months.

On-time rate88%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail 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-time87%
    Medianon time
    p9015 min
    Cancel0.5%
    Flights859

Why flights run late

Delay causes

  • Airline63%
  • Weather10%
  • Air traffic (NAS)6%
  • Late aircraft21%
  • Security0%

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 SLC → ONT

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 74% to 94% on time.

  • Mornings94% on time · p90 5 min · 154 flights · limited
  • Afternoons90% on time · p90 10 min · 1,074 flights
  • Middays87% on time · p90 15 min · 1,130 flights
  • Overnights84% on time · p90 25 min · 1,100 flights
  • Evenings74% on time · p90 80 min · 82 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 85% to 88% on time.

  • Thursdays88% on time · p90 15 min · 524 flights
  • Tuesdays88% on time · p90 20 min · 506 flights
  • Fridays88% on time · p90 15 min · 513 flights
  • Wednesdays88% on time · p90 15 min · 510 flights
  • Saturdays87% on time · p90 15 min · 456 flights
  • Sundays85% on time · p90 20 min · 517 flights
  • Mondays85% on time · p90 15 min · 514 flights
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Related pages

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.