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4,562 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 94% depart on time. After 4 pm it’s 73%.

Best time to leave 5–6 am 97% arrive on time from SEA
Best single flight DL 3881 SEA 08:47 → SMF 10:50 · 92% on time Avoid AS 681 SEA 14:16 → SMF 16:11 · 84% 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
SEA
95
95
90
94
88
84
59
80
80
82
82
75
81
61
75
76
70
% 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) 1,634 90% 0.2% 61 min
Alaska (incl. SkyWest, Horizon) 1,788 81% 0.8% 49 min
Southwest 1,140 74% 0.4% 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 3881flown by SkyWest SEA 08:47 SMF 10:50 92%
DL 4125flown by SkyWest SEA 10:10 SMF 12:18 91%
DL 4131flown by SkyWest SEA 20:25 SMF 22:28 91%
DL 4043flown by SkyWest SEA 17:00 SMF 19:01 89%
AS 681 SEA 14:16 SMF 16:11 84%
All 21 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 SMF 2h 03m 90% 0.2% 1,634 Flying now
Alaska SEA SMF 1h 55m 81% 0.8% 1,788 Flying now
Southwest SEA SMF 1h 55m 74% 0.4% 1,140 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