SJC (San Jose) to SEA (Seattle) flights arrive on time 84% of the time. The most reliable airline on this route is Delta Air Lines at 98%. The average delay is 54 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated March 2026.SJC → SEA
SJC (San Jose) to SEA (Seattle)
SJC → SEA on-time performance by month
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This route is on time most of the time. About 84% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Delta Air Lines is significantly more reliable on this route at 98% on time vs Southwest Airlines at 79%.
Airline Comparison
Delta Air Lines leads at 98% on time; Southwest Airlines trails at 79%.
Accurate?
Good to know
Departing from SJC
84% on timeTSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at SEA
82% on timeWhen flights into SEA are late, the average delay is 57 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Delta Air Lines owes you — refund rights, action plan, complaint email. Free.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.