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6,317 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 62%.

Best time to leave 7–8 am 90% arrive on time from DEN
Best single flight UA 2271 DEN 08:01 → SEA 10:00 · 91% on time Avoid AS 535 DEN 16:36 → SEA 18:38 · 67% 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).

6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
DEN
93
93
90
80
71
86
82
79
71
73
68
54
56
69
62
56
43
% 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 1,906 82% 0.5% 58 min
Frontier 431 80% 1.4% 56 min
Delta (incl. SkyWest) 1,088 79% 0.8% 85 min
Alaska 1,551 76% 0.8% 58 min
Southwest 1,341 62% 0.2% 47 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 2271 DEN 08:01 SEA 10:00 91%
DL 1731 DEN 06:30 SEA 08:31 91%
AS 643 DEN 06:02 SEA 08:05 89%
UA 1424 DEN 11:22 SEA 13:22 86%
AS 682 DEN 12:20 SEA 14:23 83%
· · ·
UA 2013 DEN 15:58 SEA 17:59 80%
UA 2651 DEN 21:10 SEA 23:10 72%
AS 535 DEN 16:36 SEA 18:38 67%
All 28 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 DEN SEA 3h 00m 82% 0.5% 1,906 Flying now
Frontier DEN SEA 3h 04m 80% 1.4% 431 Flying now
Delta DEN SEA 3h 10m 79% 0.8% 1,088 Flying now
Alaska DEN SEA 3h 03m 76% 0.8% 1,551 Flying now
Southwest DEN SEA 3h 00m 62% 0.2% 1,341 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