Best Time to Fly SJU to STT: On-Time Stats by Hour & Airline
Luis Munoz Marin International → Cyril E King
Data through July 2026 · Last updated October 18, 2026
357 flights were scheduled from San Juan (SJU) to Charlotte Amalie (STT) in the last 12 months, and 70.3% of those that flew arrived on time, 7.3 points below the US average of 77.6%.
JetBlue was the only reporting airline with regular flights on this route.
May has been the best month (94% on time) and Monday the weakest day of the week (67%).
0.6% of flights were cancelled, versus 1.8% nationally.
SJU to STT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue | 70.7% | 64 min | 0.6% | 351 |
| Frontier Airlines | Limited data | 6 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJU to STT
On-time arrival % by scheduled departure hour (local time), 805 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 10am–11am | 88.2% | 0.0% | 34 |
| 11am–12pm | 81.8% | 0.0% | 55 |
| 12pm–1pm | 83.1% | 1.3% | 156 |
| 1pm–2pm | 69.9% | 0.0% | 166 |
| 2pm–3pm | 66.4% | 0.5% | 222 |
| 3pm–4pm | 76.5% | 0.6% | 172 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SJU to STT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 13 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 30 | ||
| Summer peak (Jun 15 - Aug 15) | 68.9% | -7.2 pts | 0.7% | 152 |
| All other days | 76.1% | — | 0.3% | 610 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).