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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 8–9 pm: 2Close ×
AS 2352flown by Horizon BOI 20:47 SEA 21:21 1h 34m 201 60% 2.0% 53 min
AS 2233flown by Horizon BOI 20:51 SEA 21:29 1h 38m 28 54% 0.0% 36 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