SAT (San Antonio) to SEA (Seattle) flights arrive on time 75% of the time. The most reliable airline on this route is Alaska Airlines at 75%. The average delay is 52 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated August 2026.SAT → SEA
SAT (San Antonio) to SEA (Seattle)
SAT → SEA on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 75% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Accurate?
Good to know
Departing from SAT
81% on timeTSA is currently ~22 min. Best time: 4 AM (about 5 min).
Arriving at SEA
80% 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 ~9 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated August 2026. Source: Bureau of Transportation Statistics.