SMF (Sacramento) to ONT (Ontario) flights arrive on time 87% of the time. The most reliable airline on this route is Frontier Airlines at 90%. The average delay is 56 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated August 2026.SMF → ONT
SMF (Sacramento) to ONT (Ontario)
SMF → ONT on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is usually on time. About 87% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Airlines are roughly equal on this route — Frontier Airlines leads slightly at 90% vs Southwest Airlines at 86%.
Airline Comparison
Frontier Airlines leads at 90% on time; Southwest Airlines trails at 86%.
Accurate?
Good to know
Departing from SMF
83% on timeTSA is currently ~18 min. Best time: 4 AM (about 5 min).
Arriving at ONT
82% on timeWhen flights into ONT are late, the average delay is 64 minutes. Build buffer if you have ground plans.
If connecting at ONT: TSA is ~14 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Frontier Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of SMF? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated August 2026. Source: Bureau of Transportation Statistics.