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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 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 2601 SEA 05:00 DEN 08:43 2h 43m 135 96% 0.7% 89 min
UA 1915 SEA 05:07 DEN 08:50 2h 43m 35 100% 0.0% –
WN 3615 SEA 05:15 DEN 08:50 2h 35m 57 95% 0.0% 208 min
AS 682 SEA 07:30 DEN 11:24 2h 54m 300 86% 1.0% 46 min
WN 4920 SEA 07:35 DEN 11:15 2h 40m 16 94% 0.0% 20 min
WN 3397 SEA 07:50 DEN 11:25 2h 35m 41 93% 0.0% 38 min
AS 375 SEA 08:04 DEN 11:56 2h 52m 52 88% 1.9% 32 min
DL 1358 SEA 08:30 DEN 12:18 2h 48m 110 85% 0.0% 49 min
UA 1505 SEA 08:56 DEN 12:45 2h 49m 345 92% 0.9% 121 min
AS 1332 SEA 10:04 DEN 14:01 2h 57m 48 85% 0.0% 54 min
UA 757 SEA 11:02 DEN 14:51 2h 49m 365 88% 0.8% 66 min
UA 1715 SEA 11:02 DEN 14:51 2h 49m 35 89% 0.0% 72 min
AS 535 SEA 11:44 DEN 15:38 2h 54m 217 78% 0.9% 47 min
WN 3616 SEA 12:20 DEN 16:10 2h 50m 26 44% 0.0% 84 min
UA 1351 SEA 12:50 DEN 16:42 2h 52m 124 89% 0.0% 64 min
AS 786 SEA 13:13 DEN 17:02 2h 49m 115 83% 0.9% 41 min
AS 242 SEA 13:33 DEN 17:20 2h 47m 51 70% 0.0% 59 min
DL 2759 SEA 13:40 DEN 17:39 2h 59m 43 43% 2.3% 53 min
DL 2543 SEA 13:50 DEN 17:46 2h 56m 55 39% 1.8% 57 min
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
F9 3406 SEA 15:19 DEN 19:18 2h 59m 284 78% 1.4% 55 min
UA 325 SEA 15:40 DEN 19:29 2h 49m 36 86% 0.0% 43 min
AS 602 SEA 16:26 DEN 20:10 2h 44m 285 76% 0.4% 50 min
WN 2720 SEA 16:45 DEN 20:30 2h 45m 16 25% 0.0% 71 min
AS 310 SEA 19:00 DEN 22:45 2h 45m 52 65% 0.0% 45 min
WN 4845 SEA 19:30 DEN 23:10 2h 35m 42 40% 0.0% 59 min
WN 2328 SEA 19:30 DEN 23:08 2h 38m 16 31% 0.0% 67 min
F9 1176 SEA 19:41 DEN 23:36 2h 55m 147 78% 1.4% 82 min
UA 1218 SEA 19:54 DEN 23:38 2h 44m 185 84% 0.5% 73 min
DL 2851 SEA 19:56 DEN 23:46 2h 50m 224 78% 1.8% 56 min
AS 642 SEA 20:11 DEN 23:59 2h 48m 190 81% 0.0% 57 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 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