Flight profile · United Airlines
UA1556
Newark (EWR) to San Juan (SJU) · scheduled 9:46 AM – 1:45 PM
How UA1556 performs
1,096 operations, 2023-07-01 to 2026-06-30.
UA1556 arrived on time 77.8% of the time, against 70.2% for all EWR → SJU flights — this specific departure is 7.6 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 5.9 points better.
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 | |
|---|---|---|---|---|---|
| UA1556 | 77.8% | 0.73% | -5 min | 5.5% | 1,096 |
| United Airlines on EWR → SJU | 71.8% | 1.42% | -4 min | 10.2% | 3,304 |
| All EWR → SJU flights | 70.2% | 1.85% | -3 min | 11.9% | 6,654 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA1556 run worse on particular days?
Sunday is historically the most reliable day and Saturday the least, a gap of 13.9 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 1,096 records of UA1556 operating EWR → 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.