IAD (Washington) to SJU (San Juan) flights arrive on time 80% of the time. The most reliable airline on this route is United Airlines at 85%. The average delay is 70 minutes. Delays on this route are most often caused by air traffic and busy airspace.
Source: Bureau of Transportation Statistics. Updated May 2026.IAD → SJU
IAD (Washington) to SJU (San Juan)
IAD → SJU on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
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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?
United Airlines is significantly more reliable on this route at 85% on time vs Frontier Airlines at 34%.
Airline Comparison
United Airlines leads at 85% on time; Frontier Airlines trails at 34%.
Accurate?
Good to know
Departing from IAD
83% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. IAD has long runway queues.
TSA is currently ~8 min. Best time: 4 AM (about 5 min).
Arriving at SJU
75% on timeWhen flights into SJU are late, the average delay is 75 minutes. Build buffer if you have ground plans.
If connecting at SJU: TSA is ~19 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.