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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
Ontario flights leaving DEN 6–7 pm: 1Close ×
WN 2949 DEN 18:40 ONT 20:00 2h 20m 40 40% 0.0% 52 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.
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