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 88%. 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 April 2026.SFO → SEA
SFO (San Francisco) to SEA (Seattle)
SFO → SEA on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
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 88% on time vs Alaska Airlines at 70%.
Airline Comparison
Delta Air Lines leads at 88% on time; Alaska Airlines trails at 70%.
Accurate?
Good to know
Departing from SFO
80% on timeExpect ~20 min sitting on the taxiway after your gate pushes back. SFO has long runway queues.
TSA is currently ~12 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 ~22 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.
Let us watch your flight
We worry about delays, TSA, weather, and gates so you don't have to.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated April 2026. Source: Bureau of Transportation Statistics.