ONT → OAK: cancellations & delays
Over Jan 2023 - Apr 2026, 0.6% of Ontario International Airport (ONT) to Oakland San Francisco Bay Airport (OAK) flights were cancelled and 13.5% arrived at least 15 minutes late, across 5,237 flights, flown by WN. Cancellations peak in August.
Check today's live ONT departures →Airport pages: Ontario International Airport (ONT) · Oakland San Francisco Bay Airport (OAK)
Rates are historical averages from U.S. DOT (BTS) on-time records; a specific flight's live estimate can differ with weather and the day's disruptions.