Flight profile · United Airlines
UA2173
Boise (BOI) to Denver (DEN) · scheduled 2:35 PM – 4:35 PM
How UA2173 performs
895 operations, 2023-09-29 to 2026-06-30.
UA2173 arrived on time 77.7% of the time, against 82.8% for all BOI → DEN flights — this specific departure is 5.1 percentage points worse than the route as a whole. Against United Airlines’s own flights on this route it is 3.8 points worse.
Source: US DOT Bureau of Transportation Statistics · 895 operations between 2023-09-29 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA2173 | 77.7% | 0.78% | -5 min | 9.5% | 895 |
| United Airlines on BOI → DEN | 81.5% | 1.08% | -8 min | 8.1% | 3,138 |
| All BOI → DEN flights | 82.8% | 0.57% | -8 min | 6.3% | 8,568 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-29 to 2026-06-30
By day of week
Does UA2173 run worse on particular days?
Sunday is historically the most reliable day and Friday the least, a gap of 10.9 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-29 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes UA2173 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→HDN Denver to Hayden | 2026-03-29 – 2026-06-30 | 94 | 62.8% |
| DEN→TUS Denver to Tucson | 2023-10-29 – 2024-02-14 | 108 | 74.1% |
| IAH→GSP Houston to Greenville/Greer/Spartanburg | 2023-09-05 – 2023-09-28 | 24 | — |
| ORD→MCO Chicago to Orlando | 2023-07-01 – 2023-09-04 | 66 | — |
| MCI→ORD Kansas City to Chicago | 2023-08-01 – 2023-09-04 | 34 | — |
Because the same number has served different journeys, the statistics above describe only the route UA2173 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 895 records of UA2173 operating BOI → 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.