Air CanadaAC
Flights AC4080 varies daily · AC4015 15:21 daily · AC4121 varies Mo Th Sa · AC4285 varies daily
live
Direct flights from Ontario (ONT) to San Francisco (SFO): 34 nonstop departures observed each week across 6 airlines. 83% of the last 12 operated flights arrived within 15 minutes of schedule. The median arrival is 3 minutes late. No cancellations were recorded across the 12 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 8 October 2026 at 04:38 UTC.
ONT
Ontario
smooth · +13
SFO
San Francisco
smooth · +0
585 km · ~1h 15m est.
Runs reliable · 6 airlines · 34x weekly · nonstop
83% on time
of the last 12 operated ONT → SFO flights arrived within 15 minutes
Median arrival delay is +3 min. 0 of 12 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+3 minacross the last 12 operated legs
Flight time~1h 15mestimated from route distance
Weekly departures34x6 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 12
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Air CanadaCopa AirlinesEmiratesFrontier 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 daysCopa AirlinesCM
Flights CM1360 15:21 We Th Su · CM2529 17:50 We Th Su · CM2528 20:19 Mo Th Fr Su
EmiratesEK
Flights EK6212 12:43 daily
Frontier AirlinesF9
Flights F91159 12:07 Mo Th Fr Su
United AirlinesUA60% on time
Flights UA2363 varies Mo Th Fr Su · UA1387 varies daily · UA5330 11:10 Tu We Sa · UA5905 11:10 daily
VolarisY4
Flights Y42186 13:43 Mo Th Fr Su
History
operated legs · board outcomes10-07AC4015arrived+3
10-07AC4080arrived+9
10-07AC4112arrived−13
10-07AC4285arrived−25
10-07CM1360arrived+3
10-07CM2529arrived−25
10-07EK6212arrived−13
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: 53% odds of a 15+ minute delay and around +18 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 91/100. 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 11:10 and evening departures around 18:32 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?
6 carriers operate this route, around 102 flights a week between them. Compare carrier days and times in the airline list above.
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