Flight profile · Delta Air Lines
DL1859
New York (JFK) to San Juan (SJU) · scheduled 6:59 PM – 11:59 PM
How DL1859 performs
1,061 operations, 2023-07-01 to 2026-06-30.
DL1859 arrived on time 67.8% of the time, against 71.0% for all JFK → SJU flights — this specific departure is 3.2 percentage points worse than the route as a whole. Against Delta Air Lines’s own flights on this route it is 12.7 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,061 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1859 | 67.8% | 0.75% | -1 min | 10.2% | 1,061 |
| Delta Air Lines on JFK → SJU | 80.5% | 0.79% | -11 min | 6.2% | 3,309 |
| All JFK → SJU flights | 71.0% | 1.51% | -5 min | 11.5% | 11,028 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does DL1859 run worse on particular days?
Tuesday is historically the most reliable day and Sunday the least, a gap of 8.8 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Data and methodology
Calculated by FlyerIntel from 1,061 records of DL1859 operating JFK → SJU, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.