OnTimeStats

Historical on-time performance

Dallas to Ontario

1,200 miData through Dec 2025Source: US DOT · BTS

Flights on DAL–ONT arrive on time 68% of the time over the last 12 months.

On-time rate68%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights

based on 376 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time68%
    Medianon time
    p9050 min
    Cancel0.5%
    Flights376

Why flights run late

Delay causes

  • Airline25%
  • Weather2%
  • Air traffic (NAS)5%
  • Late aircraft69%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly DAL → 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 44% to 84% on time.

  • Middays84% on time · p90 20 min · 196 flights · limited
  • Mornings81% on time · p90 20 min · 53 flights · limited
  • Afternoons75% on time · p90 40 min · 357 flights
  • Evenings69% on time · p90 50 min · 475 flights
  • Overnights44% on time · p90 80 min · 70 flights · limited

Best day of week

On-time rates are fairly even by day on this route — ranging from 67% to 81% on time.

  • Fridays81% on time · p90 30 min · 158 flights · limited
  • Saturdays74% on time · p90 45 min · 160 flights · limited
  • Tuesdays74% on time · p90 50 min · 160 flights · limited
  • Mondays72% on time · p90 50 min · 160 flights · limited
  • Wednesdays70% on time · p90 40 min · 158 flights · limited
  • Thursdays69% on time · p90 45 min · 156 flights · limited
  • Sundays67% on time · p90 50 min · 199 flights · limited
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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.