ONT (Ontario) to PDX (Portland) flights arrive on time 87% of the time. The most reliable airline on this route is SkyWest Airlines at 92%. The average delay is 48 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated May 2026.ONT → PDX
ONT (Ontario) to PDX (Portland)
ONT → PDX on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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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?
SkyWest Airlines is significantly more reliable on this route at 92% on time vs Frontier Airlines at 76%.
Airline Comparison
SkyWest Airlines leads at 92% on time; Frontier Airlines trails at 76%.
Accurate?
Good to know
Departing from ONT
82% on timeTSA is currently ~13 min. Best time: 4 AM (about 5 min).
Arriving at PDX
83% on timeWhen flights into PDX are late, the average delay is 60 minutes. Build buffer if you have ground plans.
If connecting at PDX: TSA is ~8 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.