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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
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18
19
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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

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.
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