DTW (Detroit) to SJU (San Juan) flights arrive on time 81% of the time. The most reliable airline on this route is Delta Air Lines at 82%. The average delay is 55 minutes. Delays on this route are most often caused by air traffic and busy airspace.
Source: Bureau of Transportation Statistics. Updated March 2026.DTW → SJU
DTW (Detroit) to SJU (San Juan)
DTW → SJU on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 81% of flights arrive on schedule.
Delays on this route are most often caused by air traffic and busy airspace.
Accurate?
Airlines are roughly equal on this route — Delta Air Lines leads slightly at 82% vs Spirit Airlines at 80%.
Airline Comparison
Delta Air Lines leads at 82% on time; Spirit Airlines trails at 80%.
Accurate?
Good to know
Departing from DTW
84% on timeExpect ~17 min sitting on the taxiway after your gate pushes back. DTW 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 ~15 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.
Free flight briefing
Know before you go
Flying DTW → SJU? We'll brief you before takeoff.
Delay riskDOT stats + live data
TSA waitCurrent checkpoint lines
WeatherBoth airports
Gate & terminalLive updates
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated March 2026. Source: Bureau of Transportation Statistics.