Flight profile · United Airlines
UA721
Boston (BOS) to Washington (IAD) · scheduled 2:25 PM – 4:09 PM
How UA721 performs
641 operations, 2024-05-23 to 2026-06-30.
UA721 arrived on time 74.1% of the time, against 83.6% for all BOS → IAD flights — this specific departure is 9.5 percentage points worse than the route as a whole. Against United Airlines’s own flights on this route it is 9.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 641 operations between 2024-05-23 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA721 | 74.1% | 2.03% | 0 min | 7.8% | 641 |
| United Airlines on BOS → IAD | 83.6% | 1.28% | -9 min | 6.1% | 4,464 |
| All BOS → IAD flights | 83.6% | 1.27% | -9 min | 6.1% | 4,476 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-05-23 to 2026-06-30
Other routes UA721 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 |
|---|---|---|---|
| IAD→LAS Washington to Las Vegas | 2026-02-12 – 2026-03-04 | 18 | — |
| ORD→BOS Chicago to Boston | 2025-05-01 – 2025-08-18 | 93 | 89.2% |
| JAC→SFO Jackson to San Francisco | 2025-08-02 – 2025-08-16 | 3 | — |
| IAH→SAT Houston to San Antonio | 2025-06-28 – 2025-07-26 | 5 | — |
| IAD→MSY Washington to New Orleans | 2025-01-07 – 2025-02-12 | 37 | — |
| MSY→LAX New Orleans to Los Angeles | 2025-02-06 – 2025-02-07 | 2 | — |
| IAH→BOS Houston to Boston | 2024-10-27 – 2024-12-02 | 36 | — |
| LAX→IAH Los Angeles to Houston | 2024-10-27 – 2024-12-02 | 36 | — |
| EWR→BOS Newark to Boston | 2023-07-01 – 2024-05-22 | 308 | 84.7% |
| TPA→EWR Tampa to Newark | 2023-12-21 – 2024-01-08 | 19 | — |
| MCI→EWR Kansas City to Newark | 2023-07-01 – 2023-09-04 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route UA721 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 641 records of UA721 operating BOS → IAD, 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.