Best Time to Fly STT to SJU: On-Time Stats by Hour & Airline
Cyril E King → Luis Munoz Marin International
Data through July 2026 · Last updated October 18, 2026
548 flights were scheduled from Charlotte Amalie (STT) to San Juan (SJU) in the last 12 months, and 71.3% of those that flew arrived on time, 6.4 points below the US average of 77.6%.
JetBlue was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (83% on time) and January the worst month (62%).
The cancellation rate was 2.2% (US average 1.8%).
STT to SJU 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 | 71.5% | 76 min | 2.2% | 542 |
| Frontier Airlines | Limited data | 6 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STT to SJU
On-time arrival % by scheduled departure hour (local time), 1,131 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 10am–11am | Limited data | 4 | |
| 11am–12pm | Limited data | 5 | |
| 12pm–1pm | 72.5% | 1.0% | 101 |
| 1pm–2pm | 77.1% | 1.7% | 178 |
| 2pm–3pm | 69.4% | 2.2% | 274 |
| 3pm–4pm | 77.5% | 1.3% | 225 |
| 4pm–5pm | 73.3% | 0.6% | 324 |
| 5pm–6pm | Limited data | 20 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STT to SJU
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 | 18 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 59.0% | -16.1 pts | 4.6% | 65 |
| Summer peak (Jun 15 - Aug 15) | 67.6% | -7.6 pts | 1.1% | 184 |
| All other days | 75.2% | — | 1.2% | 864 |
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).