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Sun, Oct 4 has passed, so this is the 12-month record.

5,008 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 92% depart on time. After 4 pm it’s 63%.

Best time to leave 5–6 am 92% arrive on time from COS
Best single flight UA 4677 COS 07:45 → DEN 08:52 · 94% on time Avoid UA 4719 COS 17:07 → DEN 18:20 · 68% 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
COS
93
92
93
88
85
86
82
80
81
65
63
62
66
% 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 (incl. SkyWest) 3,879 82% 1.4% 76 min
Southwest 1,129 78% 0.3% 57 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 4677flown by SkyWest COS 07:45 DEN 08:52 94%
UA 4696flown by SkyWest COS 07:05 DEN 08:10 90%
UA 5291flown by SkyWest COS 06:00 DEN 07:05 89%
UA 5400flown by SkyWest COS 10:23 DEN 11:38 88%
UA 5634flown by SkyWest COS 09:20 DEN 10:33 85%
· · ·
UA 4675flown by SkyWest COS 11:31 DEN 12:45 82%
UA 5391flown by SkyWest COS 18:32 DEN 19:45 72%
UA 4719flown by SkyWest COS 17:07 DEN 18:20 68%
All 20 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 COS DEN 1h 06m 82% 1.4% 3,879 Flying now
Southwest COS DEN 55m 78% 0.3% 1,129 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