Flight profile · Delta Air Lines
DL1780
Boston (BOS) to San Juan (SJU) · scheduled 8:10 AM – 12:15 PM
How DL1780 performs
1,096 operations, 2023-07-01 to 2026-06-30.
DL1780 arrived on time 80.2% of the time, against 67.8% for all BOS → SJU flights — this specific departure is 12.4 percentage points better than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 1,096 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1780 | 80.2% | 0.46% | -7 min | 4.4% | 1,096 |
| Delta Air Lines on BOS → SJU | 79.3% | 0.68% | -6 min | 5.1% | 1,176 |
| All BOS → SJU flights | 67.8% | 1.60% | 0 min | 12.2% | 5,869 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does DL1780 run worse on particular days?
Saturday is historically the most reliable day and Tuesday the least, a gap of 5.6 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.
Other routes DL1780 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.
| Route | Operated | Flights | On time |
|---|---|---|---|
| SJU→BOS San Juan to Boston | 2023-07-01 – 2026-06-30 | 1,017 | 84.0% |
Because the same number has served different journeys, the statistics above describe only the route DL1780 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,096 records of DL1780 operating BOS → 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.