Luis Munoz Marin International (SJU) Delays and On-Time Departures
San Juan, PR · ranked 275th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
76.0% of the 35,302 flights scheduled to depart San Juan (SJU) in the last 12 months left on time, 1.5 points below the US average of 77.4%.
That ranks 275th of 333 US airports tracked on this site, with 2.0% of departures cancelled.
Among airlines at San Juan (SJU), Delta Air Lines left on time most often (86.1%).
Over 24 months, Wednesday was the most reliable day (81% on time) and August the worst month (69%).
Best time of day to fly out of San Juan (SJU)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 66.8% | 2.3% | 643 |
| 1am–2am | 72.3% | 4.1% | 1,092 |
| 2am–3am | 76.8% | 2.1% | 979 |
| 3am–4am | 77.8% | 1.9% | 1,056 |
| 4am–5am | 84.3% | 2.0% | 358 |
| 5am–6am | 90.8% | 1.4% | 2,782 |
| 6am–7am | 90.5% | 1.7% | 6,300 |
| 7am–8am | 92.4% | 1.3% | 5,737 |
| 8am–9am | 90.5% | 1.2% | 2,622 |
| 9am–10am | 86.3% | 1.4% | 1,337 |
| 10am–11am | 82.8% | 1.2% | 2,174 |
| 11am–12pm | 81.1% | 1.1% | 3,117 |
| 12pm–1pm | 79.3% | 1.0% | 3,082 |
| 1pm–2pm | 76.3% | 1.0% | 5,470 |
| 2pm–3pm | 76.0% | 1.2% | 5,933 |
| 3pm–4pm | 67.8% | 1.4% | 5,909 |
| 4pm–5pm | 69.3% | 1.3% | 5,271 |
| 5pm–6pm | 69.3% | 1.9% | 4,573 |
| 6pm–7pm | 70.2% | 1.5% | 4,306 |
| 7pm–8pm | 65.1% | 2.1% | 3,027 |
| 8pm–9pm | 65.1% | 2.1% | 2,603 |
| 9pm–10pm | 66.8% | 1.6% | 2,366 |
| 10pm–11pm | 65.9% | 1.9% | 646 |
| 11pm–12am | 69.8% | 4.5% | 156 |
Airlines at SJU ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Delta Air Lines | 86.1% | 87.6% | 1.6% | 3,623 |
| United Airlines | 84.6% | 84.2% | 1.2% | 3,614 |
| American Airlines | 77.3% | 80.7% | 1.4% | 4,961 |
| Frontier Airlines | 73.4% | 71.8% | 2.4% | 4,915 |
| JetBlue | 73.2% | 74.1% | 2.3% | 11,960 |
| Southwest Airlines | 72.3% | 79.1% | 0.8% | 3,868 |
| Spirit Airlines | 69.5% | 70.2% | 4.6% | 2,361 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of SJU
On-time departures by day, 24 months.
Best month to fly out of SJU
On-time departures by month, 24 months.
Holiday travel at San Juan (SJU)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 76.1% | -2.9 pts | 1.2% | 1,446 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.9% | -10.1 pts | 5.1% | 3,935 |
| Summer peak (Jun 15 - Aug 15) | 72.5% | -6.5 pts | 2.1% | 13,324 |
| All other days | 79.0% | — | 1.1% | 52,834 |
Monthly on-time departure trend at SJU
On-time departure % each month, with the 12-month US average for reference.
Routes from San Juan (SJU)
Every route from SJU with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| SJU → Orlando (MCO) | 78.0% | 1.1% | 6,073 |
| SJU → New York (JFK) | 78.3% | 3.2% | 3,596 |
| SJU → Miami (MIA) | 78.2% | 1.0% | 2,643 |
| SJU → Fort Lauderdale (FLL) | 74.7% | 1.5% | 2,336 |
| SJU → Atlanta (ATL) | 81.4% | 1.4% | 2,095 |
| SJU → Newark (EWR) | 75.0% | 3.1% | 2,084 |
| SJU → Boston (BOS) | 71.0% | 3.1% | 1,961 |
| SJU → Philadelphia (PHL) | 71.0% | 3.4% | 1,934 |
| SJU → Tampa (TPA) | 76.1% | 1.7% | 1,519 |
| SJU → Chicago (ORD) | 78.6% | 2.4% | 1,394 |
| SJU → Baltimore (BWI) | 79.3% | 2.5% | 1,162 |
| SJU → Charlotte (CLT) | 85.4% | 1.7% | 1,081 |
| SJU → Dallas/Fort Worth (DFW) | 78.8% | 2.8% | 987 |
| SJU → Hartford (BDL) | 69.8% | 2.3% | 966 |
| SJU → Houston (IAH) | 87.7% | 0.5% | 930 |
| SJU → Washington (IAD) | 87.2% | 0.7% | 706 |
| SJU → Raleigh/Durham (RDU) | 82.5% | 1.7% | 467 |
| SJU → Washington (DCA) | 71.1% | 1.9% | 364 |
| SJU → White Plains (HPN) | 70.5% | 4.2% | 359 |
| SJU → Detroit (DTW) | 82.5% | 1.7% | 357 |
| SJU → Charlotte Amalie (STT) | 70.3% | 0.6% | 357 |
| SJU → Denver (DEN) | 87.2% | 0.3% | 333 |
| SJU → Christiansted (STX) | 74.5% | 0.9% | 317 |
| SJU → Providence (PVD) | 69.3% | 1.7% | 299 |
| SJU → Jacksonville (JAX) | 78.8% | 2.3% | 261 |
| SJU → Minneapolis (MSP) | 82.8% | 3.9% | 153 |