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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
Denver flights leaving COS 4–5 pm: 1Close ×
WN 1222 COS 16:55 DEN 17:45 50m 50 38% 0.0% 75 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 (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