2,643 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 94% depart on time. After 4 pm it’s 2 in 3.

Best time to leave 5–6 am 95% arrive on time from ONT

Best single flight UA 2446 ONT 05:00 → DEN 08:20 · 94% on time Avoid F9 2908 ONT 10:50 → DEN 14:10 · 77% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

ONT

% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.


United	823	87%	0.4%	90 min
Frontier	552	85%	0.4%	100 min
Southwest	1,268	77%	0.3%	55 min

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.


UA 2446	ONT 05:00	DEN 08:20	94%
F9 1500	ONT 06:00	DEN 09:24	90%
UA 1263	ONT 13:18	DEN 16:38	84%
F9 2908	ONT 10:50	DEN 14:10	77%

All 10 flights on this route →

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.


United	ONT	DEN	2h 18m	87%	0.4%	823	Flying now
Frontier	ONT	DEN	2h 24m	85%	0.4%	552	Flying now
Southwest	ONT	DEN	2h 15m	77%	0.3%	1,268	Flying now

Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON