Delta Air LinesDL
Flights DL521 18:00 Sa
live
Direct flights from Ontario (ONT) to Los Angeles (LAX): 1 nonstop departure observed each week across 1 airline. The median arrival is 77 minutes late. No cancellations were recorded across the 1 tracked flight. The nonstop covers 75 km, an estimated 36 minutes in the air. Measured by Pro Flight Search from live flight boards at Ontario and Los Angeles. Updated 11 October 2026 at 05:33 UTC.
ONT
Ontario
busy · +17
LAX
Los Angeles
busy · +19
75 km · ~0h 36m est.
Running clean · 1 airline · 1x weekly · nonstop
76 / 100
route health from live ONT and LAX delay boards
Median arrival delay is +77 min. 0 of 1 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+77 minacross the last 1 operated legs
Flight time~0h 36mestimated from route distance
Weekly departures1x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Delta Air Lines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at ONT and LAX: 42% odds of a 15+ minute delay and around +8 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Ontario to Los Angeles route actually runs
Pro Flight Search records official board updates for nonstop ONT to LAX flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Ontario (ONT) to Los Angeles (LAX) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/ONT-LAX
ONT to LAX questions
Is ONT–LAX running on time right now?
Mostly on schedule. The arrival side at LAX is the weaker end, route health score 76/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from ONT to LAX?
Great-circle distance is 75 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 35–36 min gate-to-gate on this route.
How often does ONT–LAX fly?
Delta Air Lines runs the route with about 1 flight a week (sat). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at ONT and arrival-side delay at LAX, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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