ONT → DENOntario to Denver

live

Direct flights from Ontario (ONT) to Denver (DEN): 21 nonstop departures observed each week across 3 airlines. 75% of the last 12 operated flights arrived within 15 minutes of schedule. The median arrival is 10 minutes late. No cancellations were recorded across the 12 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 16 October 2026 at 19:08 UTC.

Today, ONT → DEN

Fri 16 Oct · local times
  1. 05:00 UA2446United Airlines Left 05:10 +10 Landed 08:14 −7
  2. 05:40 WN4115Southwest Airlines Left 05:56 +16 Landed 09:05 +10
  3. 06:15 F91500Frontier Airlines Left 06:54 +39 Landed 10:09 +28
  4. 08:05 WN3263Southwest Airlines Left 08:23 +18 Landed 11:27 +12
  5. 11:52 F92908Frontier Airlines On schedule DEN est. 14:48sched 15:18
  6. 12:40 WN3291Southwest Airlines On scheduleT4 DEN est. 16:57 +67sched 15:50
  7. 13:24 UA1263United Airlines On scheduleT2 DEN est. 16:42sched 16:45
  8. · WN3264Southwest Airlines On schedule DEN est. 18:05 +5sched 18:00

Checked ONT board 10:18 · DEN board 13:08

ONT Ontario busy · +18
DEN Denver smooth · +0
1,316 km · ~2h 11m est.
dep bank 05:00–17:4021x weekly
Runs mixed · 3 airlines · 21x weekly · nonstop
75% on time

of the last 12 operated ONT → DEN flights arrived within 15 minutes

Median arrival delay is +10 min. 0 of 12 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival+10 minacross the last 12 operated legs
Flight time~2h 11mestimated from route distance
Weekly departures21x3 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 12

The week

scheduled departures · origin local time
06121824
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 days
Frontier AirlinesF9

Flights F91500 06:15 daily · F91262 11:52 Tu We Sa · F92908 varies daily

Southwest AirlinesWN67% on time

Flights WN4115 varies Mo Tu We Th Fr Su · WN3529 06:50 Sa · WN3263 08:05 Mo Tu We Th Fr · WN1782 08:55 Sa

United AirlinesUA

Flights UA2446 05:00 daily · UA1263 13:24 daily

History

operated legs · board outcomes
10-16F91500dep +39 → arr+28
10-16UA2446dep +10 → arr−7
10-16WN3263dep +18 → arr+12
10-16WN4115dep +16 → arr+10
10-15F91500arrived−2
10-15F92908arrived−1
10-15UA1263arrived−4
10-15UA2446arrived−17
10-15WN3263arrived+14
10-15WN3264arrived+52
10-15WN3291arrived+20
10-15WN4115arrived+1

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
ONTOntario +18 min busy 🌤 few clouds · NE 16 kt Full ONT delay board →
DENDenver +0 min smooth 🌤 clear · SSE 5 kt Full DEN delay board →

Weather 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 →

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
https://proflightsearch.com/search-flights/ONT-DEN
How we measure this →

ONT to DEN questions

Is ONT–DEN running on time right now?

Smooth skies ahead. The departure side at ONT is the weaker end, route health score 88/100. 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 17:40 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 56 flights a week between them. Compare carrier days and times in the airline list above.