San Juan (SJU) to Raleigh/Durham (RDU): On-Time Performance
Data through May 2026
When you fly SJU to RDU matters as much as anything else about the booking: the route swung from 92% on-time in January 2026 to just 61% in December 2024. Across the full period the route averages 79% on-time against a national 78%.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 1.3
- last 12 months
- Duration
- 3h 42m
- scheduled
- Distance
- 1,432 mi
Best airline from SJU to RDU
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 81% | 16 min | 0.9% | 689 |
| Frontier Airlines | 74% | 17 min | 3.2% | 284 |
Monthly on-time trend
Best time to fly from SJU to RDU
Aim for departures around 6 a.m. (92% on-time); avoid 4 p.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 72% | 21 min |
| Tuesday | 83% | 17 min |
| Wednesdaybest | 85% | 12 min |
| Thursday | 79% | 12 min |
| Friday | 84% | 10 min |
| Saturday | 74% | 27 min |
| Sunday | 78% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft49%
- Airline operations37%
- National airspace system11%
- Weather3%
Frequently asked questions
- How often are flights from SJU to RDU delayed?
- 21% of SJU–RDU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 16 minutes.
- Which airline is most reliable from SJU to RDU?
- JetBlue Airways has the best on-time record on this route at 81%, based on 689 flights. 2 airlines flew SJU–RDU frequently enough to compare in this period.
- What is the best time of day to fly from SJU to RDU?
- Departures around 6 a.m. have the best record (92% on-time), while departures around 4 p.m. have the worst (64%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to RDU?
- The scheduled SJU–RDU flight time averages 3h 42m over 1,432 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are SJU to RDU flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SJU to RDU?
- December 2024 was the roughest month in this dataset, with only 61% of arrivals on time. The best was January 2026 at 92%. If your dates are flexible, that 31-point gap is worth planning around.
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Based on 990 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.