SJC (San Jose) to SEA (Seattle) flights arrive on time 85% of the time. The most reliable airline on this route is Delta Air Lines at 94%. The average delay is 56 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.SJC → SEA
SJC (San Jose) to SEA (Seattle)
SJC → SEA on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 85% 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 94% on time vs Southwest Airlines at 79%.
Airline Comparison
Delta Air Lines leads at 94% on time; Southwest Airlines trails at 79%.
Accurate?
Good to know
Departing from SJC
83% on timeTSA is currently ~23 min. Best time: 4 AM (about 5 min).
Arriving at SEA
81% on timeWhen flights into SEA are late, the average delay is 58 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~27 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.
Flying out of SJC? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated October 2026. Source: Bureau of Transportation Statistics.