70% of flights from Raleigh to San Juan arrived on time over the past 12 months. That is worse than the typical U.S. route. Most reliable airline: JetBlue (74%). 13% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for RDU → SJU: when a flight was late, it was under 45 minutes late 46% of the time. About 1 in 9 flights landed an hour or more late, and 1 in 36 three hours or more; 2.4% were cancelled outright.
- On time or early70%
- 15–30 min late9.9%
- 30–60 min late7.1%
- 1–2 hours late6.2%
- 2–3 hours late1.7%
- 3+ hours late2.8%
- Diverted0.2%
- Cancelled2.4%
Share of all 467 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| JetBlue | 333 | 74% | 2.4% | −6 min | 9.0% | +91 min | JetBlue |
| Frontier Airlines | 117 | 60% | 1.7% | 0 min | 16.2% | +128 min | Frontier Airlines |
| Delta Air Lines | 17 | — | — | — | — | — | Delta Air Lines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at RDU). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | JetBlue |
|---|---|
| 11 a.m. | 80% |
By month
Each calendar month pooled over 2023–2026. Best: April (77%). Worst: July (61%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 69 | — | — |
| Tuesday | 56 | — | — |
| Wednesday | 40 | — | — |
| Thursday | 79 | — | — |
| Friday | 69 | — | — |
| Saturday | 72 | — | — |
| Sunday | 82 | — | — |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 5 · weather 4 · air traffic/airport 1 · security 1
Month by month
Not enough months with data to draw a trend.
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| B6 1903 | 7:56 p.m. | 135 | 69% | 2.2% | −4 min | JetBlue |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Mar 21, 2026 | 3 | 0% | 0 |
| Nov 29, 2025 | 3 | 0% | 0 |
| Jan 3, 2026 | 3 | 0% | 3 |
| Nov 30, 2025 | 3 | 0% | 1 |
| Mar 7, 2026 | 3 | 33% | 0 |
Questions
How often are flights from RDU to SJU on time?
70% of 467 scheduled flights from Raleigh/Durham, NC to San Juan, PR arrived within 15 minutes of schedule between September 2025 and August 2026. 2.4% were cancelled.
Which airline is most on time from RDU to SJU?
JetBlue: 74% of its 333 flights on the route arrived on time. Frontier Airlines: 60%.
What month has the most delays from RDU to SJU?
July (61% on time). The best month is April (77%), over 2023–2026.
Related
- SJU → RDU (return)
- Raleigh-Durham (RDU) delays by hour
- Flights into San Juan (SJU)
- JetBlue on-time record
- Frontier Airlines on-time record
- Delta Air Lines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.