UA504
UA504 (United Airlines) is a multi-stop service on 16 routes, busiest San Francisco to Las Vegas. Of 745 departures recorded from October 2024 to July 2026, 74.2% left on time, according to the US BTS.
- On-time departures74.2%of 745 flights
- Average delay14.8 min
- July 202622▼ 63.3%vs July 2025
- Cancelled0.7%
- Legs flown under this number16
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 | 28 | 28 | 0.0% |
| February | 22 | 36 | ▲ 63.6% |
| March | 28 | 54 | ▲ 92.9% |
| April | 30 | 30 | 0.0% |
| May | 41 | 28 | ▼ 31.7% |
| June | 60 | 30 | ▼ 50.0% |
| July | 60 | 22 | ▼ 63.3% |
| August | 44 | – | – |
| September | 26 | – | – |
| October | 46 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 269 | 228 | ▼ 15.2% |
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 | 76.9% | 66.7% | ▼ 13.3% |
| February | 77.3% | 80.0% | ▲ 3.5% |
| March | 67.9% | 87.0% | ▲ 28.3% |
| April | 90.0% | 66.7% | ▼ 25.9% |
| May | 80.5% | 50.0% | ▼ 37.9% |
| June | 75.0% | 46.7% | ▼ 37.8% |
| July | 71.7% | 28.6% | ▼ 60.1% |
| August | 79.6% | – | – |
| September | 84.6% | – | – |
| October | 87.0% | – | in progress |
| November | 82.8% | – | – |
| December | 74.2% | – | – |
| Year-to-date average (Jan–Jul) | 77.0% | 60.8% | ▼ 21.1% |
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 | 2 | 1 | ▼ 50.0% |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 3 | ▲ 50.0% |
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 99.3% 740
- Cancelled 0.7% 5
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 |
|---|---|---|---|---|
| SFO LAS San Francisco International Airport – Harry Reid International Airport | 665 | 15.0 min | 75.8% | 186 |
| BWI SFO Baltimore/Washington International Thurgood Marshall Airport – San Francisco International Airport | 3,944 | 22.3 min | 59.2% | 167 |
| EWR CHS Newark Liberty International Airport – Charleston International Airport | 1,011 | 10.4 min | 76.8% | 157 |
| ATL SFO Hartsfield Jackson Atlanta International Airport – San Francisco International Airport | 3,435 | 18.4 min | 78.5% | 149 |
| LAX BWI Los Angeles International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,740 | 3.2 min | 84.6% | 39 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 70.0% | 0 |
| November 2024 | 24 | 24 | 70.8% | 0 |
| December 2024 | 28 | 28 | 82.1% | 0 |
| January 2025 | 28 | 26 | 76.9% | 2 |
| February 2025 | 22 | 22 | 77.3% | 0 |
| March 2025 | 28 | 28 | 67.9% | 0 |
| April 2025 | 30 | 30 | 90.0% | 0 |
| May 2025 | 41 | 41 | 80.5% | 0 |
| June 2025 | 60 | 60 | 75.0% | 0 |
| July 2025 | 60 | 60 | 71.7% | 0 |
| August 2025 | 44 | 44 | 79.6% | 0 |
| September 2025 | 26 | 26 | 84.6% | 0 |
| October 2025 | 46 | 46 | 87.0% | 0 |
| November 2025 | 29 | 29 | 82.8% | 0 |
| December 2025 | 31 | 31 | 74.2% | 0 |
| January 2026 | 28 | 27 | 66.7% | 1 |
| February 2026 | 36 | 35 | 80.0% | 1 |
| March 2026 | 54 | 54 | 87.0% | 0 |
| April 2026 | 30 | 30 | 66.7% | 0 |
| May 2026 | 28 | 28 | 50.0% | 0 |
| June 2026 | 30 | 30 | 46.7% | 0 |
| July 2026 | 22 | 21 | 28.6% | 1 |