UA540
UA540 (United Airlines) is a multi-stop service on 9 routes, busiest Denver to San Diego. Of 941 departures recorded from October 2024 to July 2026, 72.6% left on time, according to the US BTS.
- On-time departures72.6%of 941 flights
- Average delay15.2 min
- July 202662▲ 100.0%vs July 2025
- Cancelled0.3%
- Legs flown under this number9
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 30 | 31 | ▲ 3.3% |
| February | 43 | 28 | ▼ 34.9% |
| March | 60 | 31 | ▼ 48.3% |
| April | 30 | 31 | ▲ 3.3% |
| May | 31 | 72 | ▲ 132.3% |
| June | 30 | 80 | ▲ 166.7% |
| July | 31 | 62 | ▲ 100.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 37 | – | in progress |
| November | 58 | – | – |
| December | 32 | – | – |
| Year to date (Jan–Jul) | 255 | 335 | ▲ 31.4% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 83.3% | 54.8% | ▼ 34.2% |
| February | 79.1% | 82.1% | ▲ 3.9% |
| March | 72.9% | 67.7% | ▼ 7.1% |
| April | 80.0% | 87.1% | ▲ 8.9% |
| May | 80.7% | 75.0% | ▼ 7.0% |
| June | 66.7% | 62.5% | ▼ 6.3% |
| July | 50.0% | 51.6% | ▲ 3.2% |
| August | 54.8% | – | – |
| September | 65.5% | – | – |
| October | 78.4% | – | in progress |
| November | 87.9% | – | – |
| December | 62.5% | – | – |
| Year-to-date average (Jan–Jul) | 73.2% | 68.7% | ▼ 6.2% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.7% 938
- Cancelled 0.3% 3
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN SAN Denver International Airport – San Diego International Airport | 1,371 | 17.0 min | 70.3% | 655 |
| SFO DEN San Francisco International Airport – Denver International Airport | 1,553 | 20.1 min | 61.1% | 72 |
| TPA DEN Tampa International Airport – Denver International Airport | 2,423 | 3.8 min | 86.6% | 67 |
| BWI DEN Baltimore/Washington International Thurgood Marshall Airport – Denver International Airport | 2,394 | 3.8 min | 88.9% | 36 |
| RDU SFO Raleigh-Durham International Airport – San Francisco International Airport | 3,853 | 12.3 min | 83.3% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 92.5% | 0 |
| November 2024 | 58 | 58 | 81.0% | 0 |
| December 2024 | 65 | 65 | 78.5% | 0 |
| January 2025 | 30 | 30 | 83.3% | 0 |
| February 2025 | 43 | 43 | 79.1% | 0 |
| March 2025 | 60 | 59 | 72.9% | 1 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 31 | 31 | 80.7% | 0 |
| June 2025 | 30 | 30 | 66.7% | 0 |
| July 2025 | 31 | 30 | 50.0% | 1 |
| August 2025 | 31 | 31 | 54.8% | 0 |
| September 2025 | 30 | 29 | 65.5% | 1 |
| October 2025 | 37 | 37 | 78.4% | 0 |
| November 2025 | 58 | 58 | 87.9% | 0 |
| December 2025 | 32 | 32 | 62.5% | 0 |
| January 2026 | 31 | 31 | 54.8% | 0 |
| February 2026 | 28 | 28 | 82.1% | 0 |
| March 2026 | 31 | 31 | 67.7% | 0 |
| April 2026 | 31 | 31 | 87.1% | 0 |
| May 2026 | 72 | 72 | 75.0% | 0 |
| June 2026 | 80 | 80 | 62.5% | 0 |
| July 2026 | 62 | 62 | 51.6% | 0 |