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5,307 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 95% depart on time. After 4 pm it’s 82%.

Best time to leave 5–6 am 96% arrive on time from BOI
Best single flight DL 3775 BOI 06:43 → SEA 07:35 · 96% on time Avoid AS 2352 BOI 20:47 → SEA 21:21 · 60% 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
21
BOI
97
96
95
92
85
82
94
86
87
87
85
86
91
80
88
69
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
Seattle flights leaving BOI 12–1 pm: 1Close ×
DL 3817flown by SkyWest BOI 12:15 SEA 12:55 1h 40m 31 90% 0.0% 101 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) 2,365 87% 0.2% 62 min
Alaska (incl. SkyWest, Horizon) 2,942 78% 0.7% 49 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 3775flown by SkyWest BOI 06:43 SEA 07:35 96%
DL 3750flown by SkyWest BOI 10:36 SEA 11:41 92%
DL 3678flown by SkyWest BOI 11:55 SEA 12:42 92%
DL 3740flown by SkyWest BOI 08:42 SEA 09:38 85%
DL 4127flown by SkyWest BOI 18:10 SEA 18:54 83%
· · ·
DL 3688flown by SkyWest BOI 19:28 SEA 20:14 77%
AS 468 BOI 18:07 SEA 18:52 76%
AS 2352flown by Horizon BOI 20:47 SEA 21:21 60%
All 26 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 BOI SEA 1h 48m 87% 0.2% 2,365 Flying now
Alaska BOI SEA 1h 38m 78% 0.7% 2,942 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