Air CanadaAC
Flights AC4080 07:35 daily · AC4285 10:30 daily · AC4015 15:25 daily · AC4112 20:56 Mo Tu Th Fr Sa Su
live
Direct flights from Ontario (ONT) to San Francisco (SFO): 33 nonstop departures observed each week across 5 airlines. 83% of the last 6 operated flights arrived within 15 minutes of schedule. The median arrival is 8 minutes early. No cancellations were recorded across the 6 tracked flights. The nonstop covers 585 km, an estimated 1 hour 15 minutes in the air. Measured by Pro Flight Search from live flight boards at Ontario and San Francisco. Updated 13 September 2026 at 19:55 UTC.
ONT
Ontario
smooth · +9
SFO
San Francisco
smooth · +3
585 km · ~1h 15m est.
Runs reliable · 5 airlines · 33x weekly · nonstop
83% on time
of the last 6 operated ONT → SFO flights arrived within 15 minutes
Median arrival delay is −8 min. 0 of 6 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−8 minacross the last 6 operated legs
Flight time~1h 15mestimated from route distance
Weekly departures33x5 direct airlines on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Air CanadaCopa AirlinesFrontier AirlinesUnited Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomes09-13AC4080arrived−8
09-121I751departed−29
Actual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at SFO: 52% odds of a 15+ minute delay and around +22 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Ontario to San Francisco route actually runs
Pro Flight Search records official board updates for nonstop ONT to SFO flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Ontario (ONT) to San Francisco (SFO) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/ONT-SFO
ONT to SFO questions
Is ONT–SFO running on time right now?
Smooth skies ahead. The departure side at ONT is the weaker end, route health score 89/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on ONT–SFO?
Operators schedule morning departures around 06:08 and evening departures around 19:13 from ONT. Earlier flights typically land before destination-airport delays accumulate later in the day; check the SFO delay card to confirm conditions when you'd arrive.
How long is the flight from ONT to SFO?
Great-circle distance is 585 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 71–80 min gate-to-gate on this route.
How often does ONT–SFO fly?
5 carriers operate this route, around 78 flights a week between them. Compare carrier days and times in the airline list above.
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