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2,642 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 9 in 10 depart on time. After 4 pm it’s 3 in 5.

Best time to leave 8–9 am 92% arrive on time from DEN
Best single flight UA 430 DEN 11:25 → ONT 12:47 · 88% on time Avoid UA 2028 DEN 19:20 → ONT 20:42 · 75% 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).

7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
DEN
87
90
67
88
75
68
70
48
49
70
58
42
65
% 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.
Frontier 551 81% 0.2% 63 min
United 823 81% 0.0% 71 min
Southwest 1,268 71% 0.1% 51 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 430 DEN 11:25 ONT 12:47 88%
F9 1261 DEN 22:29 ONT 23:49 81%
UA 2028 DEN 19:20 ONT 20:42 75%
All 12 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.
Frontier DEN ONT 2h 21m 81% 0.2% 551 Flying now
United DEN ONT 2h 22m 81% 0.0% 823 Flying now
Southwest DEN ONT 2h 20m 71% 0.1% 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