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4,425 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 3 in 4.

Best time to leave 6–7 am 96% arrive on time from SEA
Best single flight DL 3736 SEA 08:25 → SJC 10:49 · 91% on time Avoid AS 657 SEA 11:29 → SJC 13:40 · 77% 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).

6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
SEA
93
94
94
89
84
76
74
79
82
73
90
78
69
82
61
69
% 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
San Jose flights leaving SEA 10–11 am: 1Close ×
AS 582 SEA 10:00 SJC 12:20 2h 20m 49 87% 6.1% 38 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) 1,579 87% 0.2% 61 min
Alaska (incl. SkyWest, Horizon) 1,936 82% 1.0% 46 min
Southwest 905 73% 0.2% 45 min
American 4 – 0.0% –
United 1 – 0.0% –

Dimmed: fewer than 150 flights in the year, too few to rank.

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 3736flown by SkyWest SEA 08:25 SJC 10:49 91%
AS 521 SEA 14:54 SJC 17:06 87%
DL 3789flown by SkyWest SEA 11:45 SJC 14:11 84%
AS 1303 SEA 17:45 SJC 20:00 83%
DL 3956flown by SkyWest SEA 20:30 SJC 22:48 79%
· · ·
AS 657 SEA 11:29 SJC 13:40 77%
All 25 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 SJC 2h 20m 87% 0.2% 1,579 Flying now
Alaska SEA SJC 2h 14m 82% 1.0% 1,936 Flying now
Southwest SEA SJC 2h 15m 73% 0.2% 905 Flying now
American SEA SJC – 100%few flights 0.0% 4 Not flying now
United SEA SJC – 100%few flights 0.0% 1 Not 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