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Showing Delta only (incl. its regional partners)All airlines ×
2,362 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: Delta’s SEA → BOI flights land within a few points of 9 in 10 on time whatever the hour.

Best time to leave 6–7 pm 95% arrive on time from SEA
Best single flight DL 3750 SEA 07:15 → BOI 09:56 · 93% on time Avoid DL 4090 SEA 21:20 → BOI 23:51 · 85% 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
95
96
93
91
91
92
77
88
87
90
93
84
87
% 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.

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%
DL 3692flown by SkyWest SEA 19:50 BOI 22:28 87%
· · ·
DL 3688flown by SkyWest SEA 16:35 BOI 19:13 86%
DL 4090flown by SkyWest SEA 21:20 BOI 23:51 85%

All 8 Delta 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.
DL 3750flown by SkyWest SEA 07:15 BOI 09:56 1h 41m 231 93% 0.0% 80 min
DL 3678flown by SkyWest SEA 08:35 BOI 11:15 1h 40m 55 91% 0.0% 44 min
DL 3817flown by SkyWest SEA 09:00 BOI 11:34 1h 34m 193 88% 0.5% 53 min
DL 3959flown by SkyWest SEA 12:30 BOI 15:12 1h 42m 172 88% 0.0% 76 min
DL 4127flown by SkyWest SEA 14:54 BOI 17:30 1h 36m 365 88% 0.3% 66 min
DL 3688flown by SkyWest SEA 16:35 BOI 19:13 1h 36m 361 86% 0.3% 56 min
DL 3692flown by SkyWest SEA 19:50 BOI 22:28 1h 38m 346 87% 0.3% 49 min
DL 4090flown by SkyWest SEA 21:20 BOI 23:51 1h 31m 181 85% 0.6% 55 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.
Delta SEA BOI 1h 34m 89% 0.2% 2,362 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