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5,303 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 93% depart on time. After 4 pm it’s 82%.

Best time to leave 7–8 am 91% arrive on time from SEA
Best single flight DL 3750 SEA 07:15 → BOI 09:56 · 93% on time Avoid AS 2326 SEA 15:49 → BOI 18:14 · 82% 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).

7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
SEA
92
93
89
90
79
80
88
80
87
86
86
79
82
73
81
% 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
Boise flights leaving SEA 4–5 pm: 1Close ×
DL 3688flown by SkyWest SEA 16:35 BOI 19:13 1h 36m 361 86% 0.3% 56 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.
Delta (incl. SkyWest) 2,362 89% 0.2% 60 min
Alaska (incl. SkyWest, Horizon) 2,941 83% 0.4% 45 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.
DL 3750flown by SkyWest SEA 07:15 BOI 09:56 93%
DL 4127flown by SkyWest SEA 14:54 BOI 17:30 88%
DL 3959flown by SkyWest SEA 12:30 BOI 15:12 88%
DL 3817flown by SkyWest SEA 09:00 BOI 11:34 88%
AS 467 SEA 13:04 BOI 15:34 87%
· · ·
DL 3688flown by SkyWest SEA 16:35 BOI 19:13 86%
DL 4090flown by SkyWest SEA 21:20 BOI 23:51 85%
AS 2326flown by Horizon SEA 15:49 BOI 18:14 82%
All 24 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.
Delta SEA BOI 1h 34m 89% 0.2% 2,362 Flying now
Alaska SEA BOI 1h 28m 83% 0.4% 2,941 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