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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
Seattle flights leaving DEN 3–4 pm: 1Close ×
UA 2013 DEN 15:58 SEA 17:59 3h 01m 260 80% 0.8% 71 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 1,906 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