Flight profile · United Airlines
UA540
Denver (DEN) to San Diego (SAN) · scheduled 7:40 PM – 8:55 PM
How UA540 performs
1,008 operations, 2023-07-01 to 2026-06-30.
UA540 arrived on time 69.9% of the time, against 75.9% for all DEN → SAN flights — this specific departure is 6.0 percentage points worse than the route as a whole. Against United Airlines’s own flights on this route it is 10.7 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,008 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA540 | 69.9% | 1.09% | 0 min | 9.4% | 1,008 |
| United Airlines on DEN → SAN | 80.6% | 0.87% | -7 min | 6.7% | 6,420 |
| All DEN → SAN flights | 75.9% | 0.98% | -4 min | 7.3% | 16,924 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA540 run worse on particular days?
Wednesday is historically the most reliable day and Sunday the least, a gap of 12.4 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 UA540 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→DEN San Francisco to Denver | 2026-05-21 – 2026-06-30 | 41 | — |
| RDU→SFO Raleigh–Durham to San Francisco | 2026-05-21 – 2026-06-24 | 30 | — |
| PNS→DEN Pensacola to Denver | 2026-04-30 – 2026-05-20 | 21 | — |
| BWI→DEN Baltimore to Denver | 2025-10-26 – 2025-12-01 | 36 | — |
| OMA→DEN Omaha to Denver | 2025-03-06 – 2025-03-29 | 24 | — |
| PDX→DEN Portland to Denver | 2025-02-13 – 2025-03-05 | 20 | — |
| TPA→DEN Tampa to Denver | 2024-03-31 – 2024-12-18 | 224 | 68.5% |
| ORD→TPA Chicago to Tampa | 2024-12-03 – 2024-12-18 | 16 | — |
| RDU→DEN Raleigh–Durham to Denver | 2024-03-07 – 2024-03-30 | 24 | — |
| SFO→LAX San Francisco to Los Angeles | 2024-01-09 – 2024-02-14 | 28 | — |
| BTR→IAH Baton Rouge to Houston | 2024-01-28 – 2024-01-28 | 1 | — |
| MCI→DEN Kansas City to Denver | 2023-10-29 – 2023-12-20 | 52 | — |
| SFO→BUR San Francisco to Burbank | 2023-11-23 – 2023-11-23 | 1 | — |
| SAV→DEN Savannah to Denver | 2023-08-01 – 2023-09-04 | 35 | — |
Because the same number has served different journeys, the statistics above describe only the route UA540 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,008 records of UA540 operating DEN → SAN, 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.