Flight profile · United Airlines
UA1255
Spokane (GEG) to Denver (DEN) · scheduled 1:44 PM – 4:56 PM
How UA1255 performs
1,093 operations, 2023-07-01 to 2026-06-30.
UA1255 arrived on time 79.1% of the time, against 83.8% for all GEG → DEN flights — this specific departure is 4.7 percentage points worse than the route as a whole. Against United Airlines’s own flights on this route it is 5.9 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,093 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1255 | 79.1% | 0.91% | -8 min | 8.1% | 1,093 |
| United Airlines on GEG → DEN | 85.0% | 1.01% | -12 min | 6.1% | 2,583 |
| All GEG → DEN flights | 83.8% | 0.53% | -8 min | 5.1% | 5,903 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA1255 run worse on particular days?
Friday is historically the most reliable day and Monday the least, a gap of 6.7 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 UA1255 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 |
|---|---|---|---|
| DEN→MEM Denver to Memphis | 2025-10-26 – 2025-12-01 | 35 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1255 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,093 records of UA1255 operating GEG → DEN, 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.