SEA (Seattle) to SFO (San Francisco) flights arrive on time 71% of the time. The most reliable airline on this route is Delta Air Lines at 77%. The average delay is 59 minutes. Delays on this route are most often caused by air traffic and busy airspace.
Source: Bureau of Transportation Statistics. Updated April 2026.SEA → SFO
SEA (Seattle) to SFO (San Francisco)
SEA → SFO on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 71% of flights arrive on schedule.
Delays on this route are most often caused by air traffic and busy airspace.
Accurate?
Delta Air Lines edges out Alaska Airlines on this route — 77% vs 65% on time.
Airline Comparison
Delta Air Lines leads at 77% on time; Alaska Airlines trails at 65%.
Accurate?
Good to know
Departing from SEA
82% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.
TSA is currently ~13 min. Best time: 4 AM (about 5 min).
Arriving at SFO
80% on timeWhen flights into SFO are late, the average delay is 67 minutes. Build buffer if you have ground plans.
If connecting at SFO: TSA is ~29 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated April 2026. Source: Bureau of Transportation Statistics.