SFO (San Francisco) to SEA (Seattle) flights arrive on time 76% of the time. The most reliable airline on this route is Delta Air Lines at 87%. The average delay is 57 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated July 2026.SFO → SEA
SFO (San Francisco) to SEA (Seattle)
SFO → 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 76% 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 87% on time vs Alaska Airlines at 71%.
Airline Comparison
Delta Air Lines leads at 87% on time; Alaska Airlines trails at 71%.
Accurate?
Good to know
Departing from SFO
78% on timeExpect ~21 min sitting on the taxiway after your gate pushes back. SFO has long runway queues.
TSA is currently ~20 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 ~18 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 SFO? 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 July 2026. Source: Bureau of Transportation Statistics.