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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

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 in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
UA 4697flown by SkyWest COS 05:30 DEN 06:35 1h 05m 37 84% 0.0% 44 min
UA 5559flown by SkyWest COS 05:30 DEN 06:35 1h 05m 34 91% 0.0% 33 min
WN 1220 COS 05:45 DEN 06:45 1h 00m 49 96% 0.0% 154 min
UA 5291flown by SkyWest COS 06:00 DEN 07:05 1h 05m 315 89% 0.6% 73 min
UA 4696flown by SkyWest COS 07:05 DEN 08:10 1h 05m 312 90% 0.6% 59 min
UA 4677flown by SkyWest COS 07:45 DEN 08:52 1h 07m 216 94% 1.4% 55 min
UA 4725flown by SkyWest COS 08:45 DEN 10:02 1h 17m 72 85% 0.0% 65 min
UA 5634flown by SkyWest COS 09:20 DEN 10:33 1h 13m 348 85% 0.3% 75 min
UA 5400flown by SkyWest COS 10:23 DEN 11:38 1h 15m 170 88% 0.6% 94 min
WN 4325 COS 11:10 DEN 12:05 55m 42 71% 0.0% 36 min
UA 4675flown by SkyWest COS 11:31 DEN 12:45 1h 14m 342 82% 2.3% 60 min
UA 5620flown by SkyWest COS 12:56 DEN 14:02 1h 06m 94 86% 4.3% 98 min
UA 730 COS 13:30 DEN 14:24 54m 32 69% 0.0% 68 min
UA 4647flown by SkyWest COS 13:49 DEN 14:55 1h 06m 191 83% 2.1% 84 min
UA 4657flown by SkyWest COS 15:02 DEN 16:15 1h 13m 71 66% 1.4% 126 min
UA 265 COS 15:42 DEN 16:45 1h 03m 35 59% 2.9% 99 min
WN 1222 COS 16:55 DEN 17:45 50m 50 38% 0.0% 75 min
UA 4719flown by SkyWest COS 17:07 DEN 18:20 1h 13m 303 68% 2.6% 68 min
UA 4645flown by SkyWest COS 17:07 DEN 18:20 1h 13m 36 61% 0.0% 94 min
UA 5391flown by SkyWest COS 18:32 DEN 19:45 1h 13m 206 72% 6.3% 100 min

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