Flight profile · Delta Air Lines
DL1879
San Juan (SJU) to Atlanta (ATL) · scheduled 6:15 AM – 10:20 AM
How DL1879 performs
415 operations, 2024-06-07 to 2026-06-30.
DL1879 arrived on time 92.2% of the time, against 81.3% for all SJU → ATL flights — this specific departure is 10.9 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 4.7 points better.
Source: US DOT Bureau of Transportation Statistics · 415 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1879 | 92.2% | 1.20% | -8 min | 2.4% | 415 |
| Delta Air Lines on SJU → ATL | 87.5% | 0.64% | -9 min | 3.7% | 4,855 |
| All SJU → ATL flights | 81.3% | 0.87% | -7 min | 6.2% | 6,433 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes DL1879 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route DL1879 currently operates. Blending them would produce an average of two different flights.
Why DL1879 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
airspace and airport capacity, including weather-driven flow control
Share of the delay minutes US DOT attributed to each cause for DL1879 on SJU → ATL. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on SJU → ATL
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1763 | Delta Air Lines | 92.5% | 9 min early | 1,049 |
| DL1946 | Delta Air Lines | 85.0% | 9 min early | 1,033 |
| DL1882 | Delta Air Lines | 84.1% | 8 min early | 1,032 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 415 records of DL1879 operating SJU → ATL, 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.