JFK (New York) to SJU (San Juan) flights arrive on time 73% of the time. The most reliable airline on this route is Delta Air Lines at 80%. The average delay is 71 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated August 2026.JFK → SJU
JFK (New York) to SJU (San Juan)
JFK → SJU on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 73% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Delta Air Lines is significantly more reliable on this route at 80% on time vs Frontier Airlines at 64%.
Airline Comparison
Delta Air Lines leads at 80% on time; Frontier Airlines trails at 64%.
Accurate?
Good to know
Departing from JFK
78% on timeExpect ~23 min sitting on the taxiway after your gate pushes back. JFK has long runway queues.
TSA is currently ~31 min. Best time: 4 AM (about 5 min).
JFK cancels 2.4% of flights — higher than average. Have a backup plan.
Arriving at SJU
76% 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 ~28 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 JFK? 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.