BWI → ONT: cancellations & delays
Over Jan 2023 - Apr 2026, 0.0% of Baltimore/Washington International Thurgood Marshall Airport (BWI) to Ontario International Airport (ONT) flights were cancelled and 37.4% arrived at least 15 minutes late, across 246 flights, flown by WN. Cancellations peak in April.
Check today's live BWI departures →Airport pages: Baltimore/Washington International Thurgood Marshall Airport (BWI) · Ontario International Airport (ONT)
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.