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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

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 1,908 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