Ontario California Airport (ONT) delays today: 39% of the 102 flights we have timed operated within 15 minutes of schedule. Departures are running +26 min, across 46 flights tracked so far today. 1 of 46 tracked flights have been cancelled (2.2%). The busiest departure hour on today's board is 18:00 local, with 8 flights scheduled to leave. The most-served destination today is Seattle (SEA), with 4 departures on the board. Source: official airport boards, METAR weather, Pro Flight Search tracking. Updated 16 October 2026 at 05:18 UTC.
typical departure delay right now
Departures +26 min, arrivals +12 min. 1 of 206 flights cancelled (0.5%). Weather risk is also high; check the current conditions and forecast below.
Live arrivals · Delays & weather · Direct routes · Global delays now
Cancellation risk · Do planes make up time? · Weather delay risk
Board fetched 2h ago · how we report
Scheduled departures per 15 minutes. The tallest banks are where queues form.
Delay at the destination often ripples back into departure holds here.
Destinations on the current board, busiest first. 26 airports are served in this departures window.
The busiest departure hour on today's board is 18:00 local, with 8 flights scheduled to leave.
Every board update is stored, including the revisions. The first delay this board admits understates the median outcome. Posted vs. actual across every hub: the slippage study →
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search: Ontario California Airport (ONT) live delay and board tracking, measured from official airport boards.
https://proflightsearch.com/airport-departures/ontario-ONT
Ontario California Airport (ONT) delays today: 39% of the 102 flights we have timed operated within 15 minutes of schedule. Departures are running +26 min, across 46 flights tracked so far today. 1 of 46 tracked flights have been cancelled (2.2%).
1 of the 46 flights currently on the board are cancelled.
The busiest departure hour on today's board is 18:00 local, with 8 flights scheduled to leave.
The busiest destinations on the current board are Seattle (SEA), Las Vegas (LAS), Phoenix (PHX), San Francisco (SFO), Honolulu (HNL). In total 26 airports are served in this window.
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