OnTimeStats

Historical on-time performance

Baltimore to Ontario

2,283 miData through May 2026Source: US DOT · BTS

Flights on BWI–ONT arrive on time 66% of the time over the last 12 months.

On-time rate66%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights

based on 183 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • Southwest Airlines
    On-time66%
    Medianon time
    p9045 min
    Cancel0.0%
    Flights183

Why flights run late

Delay causes

  • Airline41%
  • Weather9%
  • Air traffic (NAS)19%
  • Late aircraft31%
  • Security0%

Most delay minutes here are attributed to Airline.

Over time

On-time trend

By season

On-time rate by month

Keep exploring

Related pages

Delay predictorfor this route→BWI airportBaltimore→ONT airportOntario→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.