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6,035 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 93% depart on time. After 4 pm it’s 3 in 5.

Best time to leave 5–6 am 97% arrive on time from DEN
Best single flight UA 2309 DEN 07:43 → SAN 09:05 · 90% on time Avoid UA 540 DEN 19:20 → SAN 20:46 · 65% 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
19
20
21
22
DEN
97
93
93
91
79
79
80
71
84
65
80
53
56
62
61
60
60
72
% 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
San Diego flights leaving DEN 7–8 am: 2Close ×
F9 2421 DEN 07:40 SAN 09:05 2h 29m 101 84% 3.0% 54 min
UA 2309 DEN 07:43 SAN 09:05 2h 22m 343 90% 0.3% 48 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 704 81% 1.0% 65 min
United 2,074 80% 0.4% 57 min
Alaska (incl. SkyWest) 869 79% 1.4% 51 min
Southwest 2,388 70% 0.5% 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 2309 DEN 07:43 SAN 09:05 90%
UA 1302 DEN 13:30 SAN 14:55 87%
UA 1281 DEN 15:55 SAN 17:20 85%
UA 1940 DEN 11:15 SAN 12:41 82%
F9 4989 DEN 22:29 SAN 23:51 77%
· · ·
UA 1835 DEN 21:00 SAN 22:25 68%
UA 540 DEN 19:20 SAN 20:46 65%
All 22 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 SAN 2h 31m 81% 1.0% 704 Flying now
United DEN SAN 2h 25m 80% 0.4% 2,074 Flying now
Alaska DEN SAN 2h 40m 79% 1.4% 869 Flying now
Southwest DEN SAN 2h 25m 70% 0.5% 2,388 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