STS (Santa Rosa) to ONT (Ontario) flights arrive on time 89% of the time. The most reliable airline on this route is SkyWest Airlines at 89%. The average delay is 69 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.STS → ONT
STS (Santa Rosa) to ONT (Ontario)
STS → ONT on-time performance by month
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is usually on time. About 89% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Accurate?
Good to know
Departing from STS
80% on timeExpect ~18 min sitting on the taxiway after your gate pushes back. STS has long runway queues.
TSA is currently ~17 min. Best time: 4 AM (about 5 min).
Arriving at ONT
81% 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 SkyWest Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of STS? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.