Flight profile · United Airlines
UA558
Denver (DEN) to Boston (BOS) · scheduled 7:45 AM – 2:07 PM
How UA558 performs
509 operations, 2024-12-19 to 2026-06-30.
UA558 arrived on time 89.9% of the time, against 71.3% for all DEN → BOS flights — this specific departure is 18.6 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 13.3 points better.
Source: US DOT Bureau of Transportation Statistics · 509 operations between 2024-12-19 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA558 | 89.9% | 0.39% | -13 min | 2.2% | 509 |
| United Airlines on DEN → BOS | 76.6% | 1.02% | -6 min | 9.3% | 5,775 |
| All DEN → BOS flights | 71.3% | 0.99% | -3 min | 11.1% | 11,395 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-12-19 to 2026-06-30
Other routes UA558 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 UA558 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 509 records of UA558 operating DEN → BOS, 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.