ONT Today
Rough day, worse than the weekly average. Departures at 60%, arrivals worse at 40%. Evening flights ran 16 points better than late morning. Fly 6pm - 10pm if you can. That window has been running at 83%.
Pick Your Window
Evening vs Late Morning is a 16-point swing at ONT. The evening block runs at 83%. If you have any say in your departure time, this is the biggest thing you can control.
Through the Day
Morning started OK at 74%. Hit 45% around 11pm, peaked at 100% around 9am. Currently at 60%, well below the morning numbers. A 55-point swing from best to worst today.
vs Last Week
Down 5 points from last week (76% vs 81%). Arrivals down 11 points too. Tue was the worst day, Sun the best.
The Bigger Picture
ONT has ranged from 70% to 87%. Best day was Mar 1 at 87%. Worst was Mar 7 at 70%. The norm is 77-83%, which is just how ONT runs. Today's 60% is well below the norm.
About ONT Delays
Ontario International Airport (ONT) is currently experiencing moderate delays with 60% on-time departures and 40% on-time arrivals. This data updates every 5 minutes from FAA sources.
Ontario International Airport has averaged 76% on-time departures this week, making it moderately reliable. Performance varies by time of day and weather conditions.
Ontario International Airport is one of 179 FAA-monitored US airports with real-time delay tracking. Data includes departure and arrival on-time percentages, updated every 5 minutes, with historical trends available for the past 90 days.
Nearby alternatives include SNA (John Wayne Orange County International Airport), LGB (Long Beach International Airport), BUR (Hollywood Burbank Airport), LAX (Los Angeles International Airport) and PSP (Palm Springs International Airport). When ONT is experiencing delays, these airports may offer better on-time performance.
Early morning departures from Ontario International Airport typically have the highest on-time rates. Delays tend to accumulate throughout the day as cascading effects from earlier disruptions compound. Check the 24-hour trend chart above for today's pattern.