SFO → ONTSan Francisco to Ontario

live

Direct flights from San Francisco (SFO) to Ontario (ONT): 28 nonstop departures observed each week across 4 airlines. The median arrival is 4 minutes early. No cancellations were recorded across the 2 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 San Francisco and Ontario. Updated 13 September 2026 at 21:40 UTC.

SFO San Francisco smooth · +0
ONT Ontario smooth · +0
585 km · ~1h 15m est.
dep bank 09:33–21:2528x weekly
Running clean · 4 airlines · 28x weekly · nonstop
100 / 100

route health from live SFO and ONT delay boards

Median arrival delay is −4 min. 0 of 2 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−4 minacross the last 2 operated legs
Flight time~1h 15mestimated from route distance
Weekly departures28x4 direct airlines on the leg

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Air CanadaFrontier AirlinesUnited AirlinesVolaris

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 days
Air CanadaAC

Flights AC4122 varies daily

Frontier AirlinesF9

Flights F92678 varies daily · F91160 18:02 Th Su

United AirlinesUA

Flights UA2661 10:37 daily · UA2619 16:40 Mo Tu We Th Fr Su · UA2850 16:40 We Th Fr Sa Su · UA2478 18:30 daily

VolarisY4

Flights Y42461 varies daily

History

operated legs · board outcomes
09-13AC4322departed−4
09-13UA2661dep −4 → arr−36

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
SFOSan Francisco +0 min smooth Full SFO delay board →
ONTOntario +0 min smooth Full ONT delay board →

Weather lens

Current conditions put the pressure at SFO: 56% odds of a 15+ minute delay, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the San Francisco to Ontario route actually runs

Pro Flight Search records official board updates for nonstop SFO to ONT 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 — San Francisco (SFO) to Ontario (ONT) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/SFO-ONT
How we measure this →

SFO to ONT questions

Is SFO–ONT running on time right now?

Smooth skies ahead. Both endpoints currently score the same, route health score 100/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on SFO–ONT?

Operators schedule morning departures around 10:37 and evening departures around 18:02 from SFO. Earlier flights typically land before destination-airport delays accumulate later in the day; check the ONT delay card to confirm conditions when you'd arrive.

How long is the flight from SFO to ONT?

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 SFO–ONT fly?

4 carriers operate this route, around 52 flights a week between them. Compare carrier days and times in the airline list above.