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6,325 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 7 in 10.

Best time to leave 5–6 am 97% arrive on time from SEA
Best single flight UA 1505 SEA 08:56 → DEN 12:45 · 92% on time Avoid AS 602 SEA 16:26 → DEN 20:10 · 76% 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
19
20
SEA
96
93
88
89
92
82
79
80
69
59
79
51
62
76
74
68
% 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 SEA 2–3 pm: 4Close ×
WN 1049 SEA 14:15 DEN 18:10 2h 55m 16 31% 0.0% 63 min
UA 333 SEA 14:33 DEN 18:22 2h 49m 32 66% 0.0% 53 min
WN 3617 SEA 14:35 DEN 18:20 2h 45m 42 14% 0.0% 47 min
UA 655 SEA 14:36 DEN 18:25 2h 49m 30 70% 0.0% 73 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 1,908 89% 0.7% 74 min
Alaska (incl. SkyWest) 1,552 79% 0.7% 49 min
Frontier 431 78% 1.4% 64 min
Delta (incl. SkyWest) 1,089 77% 0.8% 60 min
Southwest 1,345 70% 0.6% 51 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 1505 SEA 08:56 DEN 12:45 92%
UA 757 SEA 11:02 DEN 14:51 88%
AS 682 SEA 07:30 DEN 11:24 86%
UA 1218 SEA 19:54 DEN 23:38 84%
AS 642 SEA 20:11 DEN 23:59 81%
· · ·
DL 2851 SEA 19:56 DEN 23:46 78%
F9 3406 SEA 15:19 DEN 19:18 78%
AS 602 SEA 16:26 DEN 20:10 76%
All 34 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 SEA DEN 2h 47m 89% 0.7% 1,908 Flying now
Alaska SEA DEN 2h 48m 79% 0.7% 1,552 Flying now
Frontier SEA DEN 2h 59m 78% 1.4% 431 Flying now
Delta SEA DEN 2h 52m 77% 0.8% 1,089 Flying now
Southwest SEA DEN 2h 40m 70% 0.6% 1,345 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