ATL to SJU flight delays
ATL SJU Hartsfield Jackson Atlanta to Luis Munoz Marin · 1,547 miles
6,440 flights were scheduled from ATL to SJU over July 2023 through June 2026. Of the 6,375 that made the trip, 75% reached the gate less than 15 minutes behind schedule. These are arrival figures: “on time” means the flight reached the gate less than 15 minutes behind schedule. Arrivals are what decide whether you make the connection, so route and airline pages are scored on them rather than on pushback.
Data through June 2026 · Bureau of Transportation Statistics
The route in brief
- Flights in the window
- 6,440
- Arrived on time
- 75%
- Cancelled
- 0.8%
- Scheduled distance
- 1,547 miles
Cancellations are counted against everything scheduled. Diverted flights are counted with them rather than as very late arrivals, which is why the on-time share and the cancellation rate do not add up to everything that happened.
Airline by airline
Airlines with at least 100 flights on ATL–SJU, busiest first. Same route, same weather, same air traffic — which makes this the fairest comparison on the site.
| Airline | Arrived on time | Typical delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 78.8% | 53 min | 0.6% | 4,855 |
| Frontier Airlines | 55.8% | 84 min | 2.2% | 875 |
| Spirit Airlines | 71.5% | 63 min | 1% | 710 |
Month by month
July was the month to avoid on ATL–SJU: 67.2% of flights arrived on time, against 84.6% in October. Each bar pools three years of that calendar month.
| Month | Share flights that arrived on time | Flights |
|---|---|---|
| January | 73.2% | 591 |
| February | 76.4% | 516 |
| March | 70.7% | 657 |
| April | 73.1% | 576 |
| May | 72.6% | 587 |
| June | 74% | 573 |
| July | 67.2% | 598 |
| August | 74.9% | 494 |
| September | 82.9% | 374 |
| October | 84.6% | 405 |
| November | 81.8% | 460 |
| December | 76.2% | 609 |
Both ends of the route
A route’s record is built out of two airports’ habits. The hour-by-hour grid for each is on its own page.
ATL to SJU in one number
ATL → SJU
When a flight on this route was late, it was late by about 61 min.
Questions about ATL to SJU
- Which airline is most reliable from ATL to SJU?
- Delta Air Lines — its flights on this pairing arrived on time 78.8% of the time, with 4,855 scheduled. Frontier Airlines came in at 55.8% over 875 scheduled. Airlines with fewer than 100 flights on the route are not rated.
- What is the worst month to fly ATL to SJU?
- July, at 67.2% of arrivals on time, with 598 flights scheduled. October was the best of the year at 84.6%.
- How late are ATL–SJU flights when they are late?
- 61 min on average, counting only the flights that arrived 15 minutes or more behind schedule. The on-time flights are left out of that average on purpose — mixing them in would flatter it.
- How often is the ATL to SJU flight cancelled?
- 0.8% of scheduled flights on this route were cancelled, July 2023 through June 2026. Diverted flights are counted with the cancellations rather than as late arrivals.
- Are these departure or arrival numbers?
- Arrival. A flight counts as on time here if it reached the gate at SJU less than 15 minutes behind schedule. Airport pages score departures instead, because that is the number you can act on when you pick a booking time.