OnTimeStats

Airport on-time performance

ONT

Ontario

Data through Dec 2025Source: US DOT · BTS
On-time rate82%flights departing here that arrived on time
Median delayon timetypical departure delay
p90 delay30 min1 in 10 departures is worsetail risk
Cancelled0.9%of scheduled departures
Left the gate on time83%departures that pushed back within 15 min of schedule (DepDel15)

based on 26,162 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

As a connection hub

Arriving here (inbound performance)

These figures reflect inbound flights arriving at this airport — relevant for connections and layovers.

77%arrived on time here
(within 15 min, inbound flights)
  • On time77%
  • 15–59 min late15%
  • 1–2 hr late5%
  • 2 hr+ late2%
  • Cancelled or diverted1%

Arrival outcomes for inbound flights. Last segment = cancelled or diverted.

Bad day: 1 in 10 flights arrives more than 40 min late.

By airline

Carriers departing here (last 12 months)

Delay = arrival delay (ArrDel15-based)

  • Envoy Airbest
    On-time90%
    Medianon time
    p905 min
    Cancel0.0%
    Flights41
  • Delta Air Lines
    On-time90%
    Medianon time
    p9010 min
    Cancel1.1%
    Flights1,789
  • SkyWest Airlines
    On-time89%
    Medianon time
    p9010 min
    Cancel0.7%
    Flights1,760
  • Hawaiian Airlines
    On-time85%
    Medianon time
    p9015 min
    Cancel0.8%
    Flights123
  • Southwest Airlines
    On-time84%
    Medianon time
    p9025 min
    Cancel0.5%
    Flights11,297
  • United Airlines
    On-time80%
    Medianon time
    p9040 min
    Cancel0.4%
    Flights2,246
  • Alaska Airlines
    On-time79%
    Medianon time
    p9030 min
    Cancel2.0%
    Flights1,531
  • American Airlines
    On-time78%
    Medianon time
    p9040 min
    Cancel1.8%
    Flights3,522
  • JetBlue Airways
    On-time76%
    Medianon time
    p9055 min
    Cancel1.3%
    Flights153
  • Frontier Airlines
    On-time75%
    Medianon time
    p9065 min
    Cancel1.2%
    Flights1,526

Over time

Departure on-time trend

By season

On-time rate by month

Where flights go

Busiest routes

ONT → PHX→ONT → OAK→ONT → SMF→ONT → LAS→ONT → SJC→ONT → DFW→ONT → DEN→ONT → SFO→ONT → SEA→ONT → SLC→
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Will you make a connection at ONT? →

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.