RDU to SJU flight delays
Raleigh/Durham, NC (RDU) San Juan, PR (SJU) · 1,432 miles
471 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
73.16%
Arrived on time
Within 15 minutes of schedule
1.7%
Cancelled
Share of scheduled flights
94 min
When late, late by
Average across delayed arrivals
26 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. JetBlue Airways arrived on time 19.2 points more often than Frontier Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In May it ran 23.9 points more punctual than in March — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The two directions do not behave alike. SJU to RDU arrives on time 10.2 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
This is a thin route — 471 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over January 2025 – August 2026, JetBlue Airways arrived on time most often on RDU to SJU. Frontier Airlines was late most often. Flights ran closest to schedule in May and worst in March.
Every airline on RDU to SJU
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 333 | 78.9% | 1.5% | 81 min | C |
| Frontier Airlines | 121 | 59.66% | 1.65% | 119 min | F |
| Delta Air Lines | 17 | 56.25% | 5.88% | 47 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SJU to RDU San Juan back to Raleigh/Durham 83.37% on time BOther routes from Raleigh/Durham
Common questions
Are flights from Raleigh/Durham to San Juan usually delayed?
73.16% of flights on the RDU to SJU route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airline is most on time from Raleigh/Durham to San Juan?
JetBlue Airways, at 78.9% on time across 333 flights. The least punctual on the route was Frontier Airlines at 59.66%.
How often are RDU to SJU flights cancelled?
1.7% of scheduled flights did not operate — about 17 in every thousand. That is in the normal range.
What is the best month to fly Raleigh/Durham to San Juan?
May, when 87.2% of flights arrived on time. The worst was March at 63.3%.
When RDU to SJU flights are late, how late are they?
About 94 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on RDU to SJU during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →