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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).

5
6
7
8
9
10
11
12
13
14
15
16
17
18
ONT
94
95
90
94
94
78
68
57
76
60
57
61
74
% 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
Denver flights leaving ONT 6–7 am: 1Close ×
F9 1500 ONT 06:00 DEN 09:24 2h 24m 320 90% 0.3% 80 min

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