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

Leave before 9 am: 88% depart on time. After 4 pm it’s 2 in 3.

Best time to leave 8–9 am 91% arrive on time from DEN
Best single flight UA 4745 DEN 23:09 → COS 23:59 · 87% on time Avoid UA 5308 DEN 16:55 → COS 17:52 · 66% 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
23
DEN
86
90
86
79
83
88
79
71
80
67
68
53
68
54
71
66
87
% 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 78% 1.4% 71 min
Southwest 1,129 75% 0.4% 56 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 4745flown by SkyWest DEN 23:09 COS 23:59 87%
UA 5246flown by SkyWest DEN 07:45 COS 08:41 85%
UA 5306flown by SkyWest DEN 09:45 COS 10:46 83%
UA 4734flown by SkyWest DEN 11:21 COS 12:21 81%
UA 5546flown by SkyWest DEN 15:35 COS 16:32 81%
· · ·
UA 4793flown by SkyWest DEN 19:05 COS 20:01 74%
UA 5861flown by SkyWest DEN 17:55 COS 18:54 68%
UA 5308flown by SkyWest DEN 16:55 COS 17:52 66%

All 21 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 5246flown by SkyWest DEN 07:45 COS 08:41 56m 352 85% 0.3% 51 min
WN 3419 DEN 08:00 COS 08:55 55m 41 98% 0.0% 27 min
UA 5306flown by SkyWest DEN 09:45 COS 10:46 1h 01m 324 83% 2.5% 69 min
UA 4734flown by SkyWest DEN 11:21 COS 12:21 1h 00m 193 81% 4.1% 63 min
UA 5947flown by SkyWest DEN 11:32 COS 12:28 56m 62 92% 0.0% 32 min
UA 1111 DEN 11:32 COS 12:23 51m 32 75% 0.0% 84 min
UA 5614flown by SkyWest DEN 12:18 COS 13:14 56m 90 87% 1.1% 65 min
WN 1228 DEN 13:20 COS 14:05 45m 40 57% 0.0% 40 min
UA 4775flown by SkyWest DEN 13:30 COS 14:27 57m 37 73% 0.0% 63 min
UA 1803 DEN 13:48 COS 14:40 52m 35 74% 2.9% 96 min
UA 5546flown by SkyWest DEN 15:35 COS 16:32 57m 363 81% 2.2% 61 min
WN 1983 DEN 15:40 COS 16:30 50m 16 62% 0.0% 72 min
UA 5308flown by SkyWest DEN 16:55 COS 17:52 57m 229 66% 4.8% 90 min
UA 5861flown by SkyWest DEN 17:55 COS 18:54 59m 347 68% 0.3% 80 min
UA 4793flown by SkyWest DEN 19:05 COS 20:01 56m 196 74% 1.0% 59 min
UA 5669flown by SkyWest DEN 19:50 COS 20:46 56m 111 84% 0.0% 100 min
UA 5292flown by SkyWest DEN 20:30 COS 21:26 56m 11 45% 0.0% 78 min
UA 4744flown by SkyWest DEN 20:30 COS 21:26 56m 36 28% 0.0% 70 min
WN 3811 DEN 20:55 COS 21:45 52m 42 29% 0.0% 76 min
UA 4650flown by SkyWest DEN 21:10 COS 22:06 56m 322 76% 1.6% 75 min
UA 4745flown by SkyWest DEN 23:09 COS 23:59 50m 186 87% 0.0% 64 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 DEN COS 56m 78% 1.4% 3,879 Flying now
Southwest DEN COS 45m 75% 0.4% 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