Best Time to Fly STX to SJU: On-Time Stats by Hour & Airline
Henry E. Rohlsen → Luis Munoz Marin International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 75.5% of Christiansted (STX) to San Juan (SJU) flights arrived on time (317 scheduled flights). That is 2.1 points below the national average of 77.6%.
JetBlue was the only reporting airline with regular flights on this route.
May has been the best month (90% on time) and Sunday the weakest day of the week (68%).
0.9% of flights were cancelled, versus 1.8% nationally.
STX 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 | 76.4% | 47 min | 1.0% | 312 |
| Frontier Airlines | Limited data | 5 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STX to SJU
On-time arrival % by scheduled departure hour (local time), 558 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 2pm–3pm | 82.8% | 0.8% | 124 |
| 3pm–4pm | 79.5% | 1.4% | 148 |
| 4pm–5pm | 79.0% | 0.0% | 229 |
| 5pm–6pm | 58.9% | 1.8% | 57 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STX 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 | 7 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 30 | ||
| Summer peak (Jun 15 - Aug 15) | 71.1% | -10.5 pts | 0.0% | 122 |
| All other days | 81.6% | — | 0.8% | 399 |
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).