Flight profile · United Airlines
UA645
Denver (DEN) to Sioux Falls (FSD) · scheduled 5:50 PM – 8:20 PM
How UA645 performs
519 operations, 2024-12-19 to 2026-06-30.
UA645 arrived on time 72.8% of the time, against 80.6% for all DEN → FSD flights — this specific departure is 7.8 percentage points worse than the route as a whole. Against United Airlines’s own flights on this route it is 2.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 519 operations between 2024-12-19 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA645 | 72.8% | 0.58% | -2 min | 12.5% | 519 |
| United Airlines on DEN → FSD | 75.2% | 0.54% | -4 min | 9.5% | 1,291 |
| All DEN → FSD flights | 80.6% | 0.77% | -7 min | 7.1% | 5,172 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-12-19 to 2026-06-30
Other routes UA645 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 |
|---|---|---|---|
| TPA→DEN Tampa to Denver | 2026-02-12 – 2026-06-30 | 139 | 91.4% |
| LAX→DEN Los Angeles to Denver | 2025-12-18 – 2026-01-05 | 19 | — |
| DEN→BOS Denver to Boston | 2025-08-19 – 2025-09-24 | 37 | — |
| MCI→DEN Kansas City to Denver | 2025-08-19 – 2025-09-24 | 37 | — |
| SEA→DEN Seattle to Denver | 2025-03-06 – 2025-03-29 | 24 | — |
| EWR→DEN Newark to Denver | 2024-12-03 – 2024-12-18 | 16 | — |
| EWR→ORD Newark to Chicago | 2023-09-05 – 2024-12-02 | 42 | — |
| MIA→EWR Miami to Newark | 2024-10-27 – 2024-12-02 | 37 | — |
| ORD→CMH Chicago to Columbus | 2024-09-26 – 2024-10-26 | 31 | — |
| SBA→SFO Santa Barbara to San Francisco | 2024-03-07 – 2024-09-25 | 203 | 71.0% |
| DEN→SBA Denver to Santa Barbara | 2023-09-06 – 2024-06-26 | 264 | 83.2% |
| RSW→DEN Fort Myers to Denver | 2024-01-09 – 2024-02-14 | 37 | — |
| SFO→SEA San Francisco to Seattle | 2023-07-01 – 2023-09-04 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route UA645 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 519 records of UA645 operating DEN → FSD, 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.