Frontier AirlinesF9
Flights F91500 06:00 daily · F92908 10:49 Mo Th Fr Su · F91262 19:56 Tu We Sa
live
Direct flights from Ontario (ONT) to Denver (DEN): 21 nonstop departures observed each week across 3 airlines. 100% of the last 14 operated flights arrived within 15 minutes of schedule. The median arrival is 13 minutes early. No cancellations were recorded across the 14 tracked flights. The nonstop covers 1,316 km, an estimated 2 hours 11 minutes in the air. Measured by Pro Flight Search from live flight boards at Ontario and Denver. Updated 7 September 2026 at 03:40 UTC.
ONT
Ontario
busy · +16
DEN
Denver
busy · +23
1,316 km · ~2h 11m est.
Runs reliable · 3 airlines · 21x weekly · nonstop
100% on time
of the last 14 operated ONT → DEN flights arrived within 15 minutes
Median arrival delay is −13 min. 0 of 14 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−13 minacross the last 14 operated legs
Flight time~2h 11mestimated from route distance
Weekly departures21x3 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 14
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Frontier AirlinesSouthwest AirlinesUnited Airlines
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 DEN: 44% odds of a 15+ minute delay and around +10 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 Denver route actually runs
Pro Flight Search records official board updates for nonstop ONT to DEN 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 Denver (DEN) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/ONT-DEN
ONT to DEN questions
Is ONT–DEN running on time right now?
Mostly on schedule. The arrival side at DEN is the weaker end, route health score 74/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on ONT–DEN?
Operators schedule morning departures around 05:00 and evening departures around 19:56 from ONT. Earlier flights typically land before destination-airport delays accumulate later in the day; check the DEN delay card to confirm conditions when you'd arrive.
How long is the flight from ONT to DEN?
Great-circle distance is 1,316 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 123–143 min gate-to-gate on this route.
How often does ONT–DEN fly?
3 carriers operate this route, around 53 flights a week between them. Compare carrier days and times in the airline list above.
.