Raleigh/Durham (RDU) to San Juan (SJU): On-Time Performance
Data through July 2026
Raleigh/Durham (RDU) to San Juan (SJU) effectively runs on two schedules. In May 2026, 87% of arrivals were on time; in July 2026 that fell to 56% — a 31-point seasonal swing. Across the full period the route averages 71% on-time against a national 78%. Morning departures also hold up better than evening ones (79% vs 61%), which matters most in the rough months.
- On-time
- 71%
- arrived <15 min late
- Avg delay
- 29 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 1.3
- last 12 months
- Duration
- 3h 29m
- scheduled
- Distance
- 1,432 mi
Best airline from RDU to SJU
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 76% | 24 min | 1.1% | 717 |
| Frontier Airlines | 58% | 42 min | 2.9% | 280 |
Monthly on-time trend
Best time to fly from RDU to SJU
Aim for departures around 6 a.m. (97% on-time); avoid 9 p.m. departures (59%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 62% | 52 min |
| Tuesday | 75% | 34 min |
| Wednesday | 75% | 25 min |
| Thursday | 73% | 18 min |
| Fridaybest | 78% | 20 min |
| Saturday | 65% | 28 min |
| Sunday | 68% | 23 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft48%
- Airline operations34%
- National airspace system15%
- Weather3%
Frequently asked questions
- How often are flights from RDU to SJU delayed?
- 30% of RDU–SJU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 29 minutes.
- Which airline is most reliable from RDU to SJU?
- JetBlue Airways has the best on-time record on this route at 76%, based on 717 flights. 2 airlines flew RDU–SJU frequently enough to compare in this period.
- What is the best time of day to fly from RDU to SJU?
- Departures around 6 a.m. have the best record (97% on-time), while departures around 9 p.m. have the worst (59%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from RDU to SJU?
- The scheduled RDU–SJU flight time averages 3h 29m over 1,432 miles. Actual arrival times vary — flights on this route land 15+ minutes late 30% of the time.
- How often are RDU to SJU flights cancelled?
- 1.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from RDU to SJU?
- July 2026 was the roughest month in this dataset, with only 56% of arrivals on time. The best was May 2026 at 87%. If your dates are flexible, that 31-point gap is worth planning around.
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Based on 1,014 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.