Flight profile · United Airlines
UA1561
Denver (DEN) to San Francisco (SFO) · scheduled 11:35 AM – 1:23 PM
How UA1561 performs
938 operations, 2023-09-05 to 2026-06-30.
UA1561 arrived on time 74.1% of the time, against 68.5% for all DEN → SFO flights — this specific departure is 5.6 percentage points better than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 938 operations between 2023-09-05 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1561 | 74.1% | 0.11% | -4 min | 8.6% | 938 |
| United Airlines on DEN → SFO | 74.0% | 0.72% | -4 min | 9.4% | 10,066 |
| All DEN → SFO flights | 68.5% | 0.70% | -1 min | 11.2% | 16,595 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-05 to 2026-06-30
By day of week
Does UA1561 run worse on particular days?
Tuesday is historically the most reliable day and Monday the least, a gap of 8.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-05 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes UA1561 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 |
|---|---|---|---|
| SFO→SAN San Francisco to San Diego | 2026-05-21 – 2026-06-30 | 41 | — |
| FCA→DEN Kalispell to Denver | 2026-06-25 – 2026-06-30 | 6 | — |
| SFO→ONT San Francisco to Ontario | 2026-03-05 – 2026-05-20 | 76 | — |
| GTF→DEN Great Falls to Denver | 2026-03-06 – 2026-03-28 | 23 | — |
| SFO→PHX San Francisco to Phoenix | 2024-06-27 – 2026-02-11 | 591 | 84.0% |
| MCO→DEN Orlando to Denver | 2025-12-18 – 2026-01-05 | 15 | — |
| SDF→DEN Louisville to Denver | 2025-10-26 – 2025-12-01 | 37 | — |
| MSP→DEN Minneapolis to Denver | 2025-05-01 – 2025-05-21 | 21 | — |
| ORF→DEN Norfolk to Denver | 2025-02-13 – 2025-03-05 | 21 | — |
| MIA→DEN Miami to Denver | 2024-12-19 – 2025-01-06 | 19 | — |
| SYR→DEN Syracuse to Denver | 2024-10-27 – 2024-12-02 | 37 | — |
| TPA→DEN Tampa to Denver | 2023-12-21 – 2024-10-26 | 50 | — |
| STL→DEN St. Louis to Denver | 2024-08-19 – 2024-09-25 | 38 | — |
| MEM→DEN Memphis to Denver | 2024-05-23 – 2024-06-30 | 39 | — |
| SFO→PDX San Francisco to Portland | 2023-07-01 – 2024-03-06 | 211 | 82.3% |
| MTJ→DEN Montrose to Denver | 2024-02-15 – 2024-02-25 | 4 | — |
| TUL→DEN Tulsa to Denver | 2024-01-11 – 2024-02-14 | 29 | — |
| ORD→SFO Chicago to San Francisco | 2023-08-18 – 2023-08-18 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1561 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 938 records of UA1561 operating DEN → SFO, 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.