SFO (San Francisco) to BOS (Boston) flights arrive on time 80% of the time. The most reliable airline on this route is Alaska Airlines at 84%. The average delay is 71 minutes. Delays on this route are most often caused by air traffic and busy airspace.
Source: Bureau of Transportation Statistics. Updated July 2026.SFO → BOS
SFO (San Francisco) to BOS (Boston)
SFO → BOS on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 80% of flights arrive on schedule.
Delays on this route are most often caused by air traffic and busy airspace.
Accurate?
Alaska Airlines edges out JetBlue Airways on this route — 84% vs 79% on time.
Airline Comparison
Alaska Airlines leads at 84% on time; JetBlue Airways trails at 79%.
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 ~21 min. Best time: 4 AM (about 5 min).
Arriving at BOS
77% on timeWhen flights into BOS are late, the average delay is 74 minutes. Build buffer if you have ground plans.
If connecting at BOS: TSA is ~6 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Alaska Airlines 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.