SJU (San Juan) to BOS (Boston) flights arrive on time 76% of the time. The most reliable airline on this route is Delta Air Lines at 85%. The average delay is 81 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.SJU → BOS
SJU (San Juan) to BOS (Boston)
SJU → BOS 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 airline (crew, maintenance, or boarding).
Accurate?
Delta Air Lines edges out Frontier Airlines on this route — 85% vs 72% on time.
Airline Comparison
Delta Air Lines leads at 85% on time; Frontier Airlines trails at 72%.
Accurate?
Good to know
Departing from SJU
75% on timeExpect ~17 min sitting on the taxiway after your gate pushes back. SJU has long runway queues.
TSA is currently ~15 min. Best time: 4 AM (about 7 min).
Arriving at BOS
79% 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 ~16 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.