Flight profile · United Airlines
UA2021
Washington (IAD) to San Juan (SJU) · scheduled 8:35 AM – 12:34 PM
How UA2021 performs
1,043 operations, 2023-07-01 to 2026-06-30.
UA2021 arrived on time 88.4% of the time, against 81.0% for all IAD → SJU flights — this specific departure is 7.4 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 4.8 points better.
Source: US DOT Bureau of Transportation Statistics · 1,043 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA2021 | 88.4% | 0.48% | -9 min | 2.6% | 1,043 |
| United Airlines on IAD → SJU | 83.6% | 0.46% | -7 min | 4.4% | 1,517 |
| All IAD → SJU flights | 81.0% | 0.56% | -7 min | 5.7% | 1,621 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA2021 run worse on particular days?
Wednesday is historically the most reliable day and Monday the least, a gap of 7.4 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 1,043 records of UA2021 operating IAD → 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.