SAT (San Antonio) to BOS (Boston) flights arrive on time 64% of the time. The most reliable airline on this route is Delta Air Lines at 65%. The average delay is 86 minutes. Delays on this route are most often caused by air traffic and busy airspace.
Source: Bureau of Transportation Statistics. Updated August 2026.SAT → BOS
SAT (San Antonio) to BOS (Boston)
SAT → BOS on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is frequently delayed. About 64% 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 JetBlue Airways on this route — 65% vs 60% on time.
Airline Comparison
Delta Air Lines leads at 65% on time; JetBlue Airways trails at 60%.
Accurate?
Good to know
Departing from SAT
81% on timeTSA is currently ~26 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 ~29 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 SAT? 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 August 2026. Source: Bureau of Transportation Statistics.