UA604
UA604 (United Airlines) is a multi-stop service on 22 routes, busiest Denver to Las Vegas. Of 774 departures recorded from October 2024 to July 2026, 83.0% left on time, according to the US BTS.
- On-time departures83.0%of 774 flights
- Average delay8.5 min
- July 202654▲ 116.0%vs July 2025
- Cancelled0.5%
- Legs flown under this number22
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 | 27 | 31 | ▲ 14.8% |
| February | 26 | 28 | ▲ 7.7% |
| March | 55 | 22 | ▼ 60.0% |
| April | 30 | 52 | ▲ 73.3% |
| May | 26 | 49 | ▲ 88.5% |
| June | 27 | 52 | ▲ 92.6% |
| July | 25 | 54 | ▲ 116.0% |
| August | 29 | – | – |
| September | 33 | – | – |
| October | 53 | – | in progress |
| November | 29 | – | – |
| December | 23 | – | – |
| Year to date (Jan–Jul) | 216 | 288 | ▲ 33.3% |
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 | 76.0% | 90.3% | ▲ 18.8% |
| February | 84.6% | 100.0% | ▲ 18.2% |
| March | 89.1% | 100.0% | ▲ 12.2% |
| April | 86.7% | 92.3% | ▲ 6.5% |
| May | 84.6% | 87.8% | ▲ 3.7% |
| June | 85.2% | 71.2% | ▼ 16.5% |
| July | 80.0% | 81.5% | ▲ 1.9% |
| August | 82.1% | – | – |
| September | 87.9% | – | – |
| October | 56.6% | – | in progress |
| November | 82.1% | – | – |
| December | 78.3% | – | – |
| Year-to-date average (Jan–Jul) | 83.7% | 89.0% | ▲ 6.3% |
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 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| 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 99.5% 770
- Cancelled 0.5% 4
Share of all recorded flights in the period, all legs. · Oct 27, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN LAS Denver International Airport – Harry Reid International Airport | 1,009 | 4.2 min | 85.5% | 193 |
| SFO IAH San Francisco International Airport – George Bush Intercontinental Airport | 2,627 | 14.0 min | 76.8% | 125 |
| IAH BWI George Bush Intercontinental Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,986 | -2.0 min | 94.8% | 115 |
| DEN ATL Denver International Airport – Hartsfield Jackson Atlanta International Airport | 1,927 | 5.9 min | 80.3% | 62 |
| STL IAH St. Louis Lambert International Airport – George Bush Intercontinental Airport | 1,076 | 22.1 min | 80.6% | 36 |
| IAH SLC George Bush Intercontinental Airport – Salt Lake City International Airport | 1,923 | 9.1 min | 83.3% | 36 |
| FSD DEN Sioux Falls Regional Airport – Denver International Airport | 777 | 27.0 min | 79.3% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 70.0% | 0 |
| November 2024 | 59 | 59 | 83.1% | 0 |
| December 2024 | 34 | 34 | 85.3% | 0 |
| January 2025 | 27 | 25 | 76.0% | 2 |
| February 2025 | 26 | 26 | 84.6% | 0 |
| March 2025 | 55 | 55 | 89.1% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 26 | 26 | 84.6% | 0 |
| June 2025 | 27 | 27 | 85.2% | 0 |
| July 2025 | 25 | 25 | 80.0% | 0 |
| August 2025 | 29 | 28 | 82.1% | 1 |
| September 2025 | 33 | 33 | 87.9% | 0 |
| October 2025 | 53 | 53 | 56.6% | 0 |
| November 2025 | 29 | 28 | 82.1% | 1 |
| December 2025 | 23 | 23 | 78.3% | 0 |
| January 2026 | 31 | 31 | 90.3% | 0 |
| February 2026 | 28 | 28 | 100.0% | 0 |
| March 2026 | 22 | 22 | 100.0% | 0 |
| April 2026 | 52 | 52 | 92.3% | 0 |
| May 2026 | 49 | 49 | 87.8% | 0 |
| June 2026 | 52 | 52 | 71.2% | 0 |
| July 2026 | 54 | 54 | 81.5% | 0 |