Best Time to Fly RDU to SJU: On-Time Stats by Hour & Airline
Raleigh-Durham International → Luis Munoz Marin International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 71.3% of Raleigh/Durham (RDU) to San Juan (SJU) flights arrived on time (467 scheduled flights). That is 6.3 points below the national average of 77.6%.
JetBlue was the most punctual of the 2 airlines on the route at 76.4%, while Frontier Airlines trailed at 59.1%.
April has been the best month (84% on time) and Monday the weakest day of the week (63%).
1.9% of flights were cancelled, versus 1.8% nationally.
RDU 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% | 93 min | 1.8% | 333 |
| Frontier Airlines | 59.1% | 140 min | 1.7% | 117 |
| Delta Air Lines | Limited data | 17 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly RDU to SJU
On-time arrival % by scheduled departure hour (local time), 952 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 96.8% | 0.0% | 31 |
| 7am–8am | 81.6% | 0.0% | 38 |
| 9am–10am | Limited data | 12 | |
| 10am–11am | 60.5% | 0.0% | 43 |
| 11am–12pm | 80.8% | 3.0% | 167 |
| 12pm–1pm | 80.0% | 0.0% | 30 |
| 1pm–2pm | 68.1% | 0.0% | 69 |
| 2pm–3pm | 82.1% | 0.0% | 84 |
| 3pm–4pm | 68.3% | 1.1% | 182 |
| 4pm–5pm | 73.3% | 0.0% | 31 |
| 5pm–6pm | 68.1% | 0.0% | 47 |
| 6pm–7pm | Limited data | 24 | |
| 7pm–8pm | 66.0% | 2.1% | 48 |
| 8pm–9pm | 58.9% | 1.8% | 57 |
| 9pm–10pm | 58.5% | 3.5% | 85 |
| 10pm–11pm | Limited data | 4 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on RDU 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 | 28 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 58.8% | -16.2 pts | 5.6% | 72 |
| Summer peak (Jun 15 - Aug 15) | 66.3% | -8.7 pts | 2.1% | 191 |
| All other days | 75.0% | — | 0.9% | 661 |
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).