UA645
UA645 (United Airlines) is a multi-stop service on 10 routes, busiest Denver to Sioux Falls. Of 940 departures recorded from October 2024 to July 2026, 77.6% left on time, according to the US BTS.
- On-time departures77.6%of 940 flights
- Average delay19.0 min
- July 202661▲ 96.8%vs July 2025
- Cancelled0.4%
- Legs flown under this number10
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 | 31 | 36 | ▲ 16.1% |
| February | 28 | 45 | ▲ 60.7% |
| March | 54 | 62 | ▲ 14.8% |
| April | 30 | 59 | ▲ 96.7% |
| May | 31 | 62 | ▲ 100.0% |
| June | 30 | 60 | ▲ 100.0% |
| July | 31 | 61 | ▲ 96.8% |
| August | 44 | – | – |
| September | 54 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 45 | – | – |
| Year to date (Jan–Jul) | 235 | 385 | ▲ 63.8% |
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 | 80.7% | 83.3% | ▲ 3.3% |
| February | 85.7% | 77.8% | ▼ 9.3% |
| March | 79.6% | 81.7% | ▲ 2.6% |
| April | 66.7% | 86.4% | ▲ 29.7% |
| May | 58.1% | 87.1% | ▲ 50.0% |
| June | 56.7% | 83.3% | ▲ 47.0% |
| July | 51.6% | 81.7% | ▲ 58.2% |
| August | 72.1% | – | – |
| September | 55.6% | – | – |
| October | 83.9% | – | in progress |
| November | 75.9% | – | – |
| December | 77.8% | – | – |
| Year-to-date average (Jan–Jul) | 68.4% | 83.0% | ▲ 21.4% |
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 | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 3 |
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 99.6% 936
- Cancelled 0.4% 4
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN FSD Denver International Airport – Sioux Falls Regional Airport | 777 | 26.6 min | 73.6% | 549 |
| TPA DEN Tampa International Airport – Denver International Airport | 2,423 | 2.8 min | 91.8% | 170 |
| MIA EWR Miami International Airport – Newark Liberty International Airport | 1,750 | 0.6 min | 89.2% | 37 |
| MCI DEN Kansas City International Airport – Denver International Airport | 855 | -1.6 min | 89.2% | 37 |
| DEN BOS Denver International Airport – Boston Logan International Airport | 2,816 | 55.4 min | 35.1% | 37 |
| EWR ORD Newark Liberty International Airport – Chicago O'Hare International Airport | 1,154 | 7.7 min | 75.0% | 36 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 25 | 25 | 100.0% | 0 |
| November 2024 | 59 | 59 | 78.0% | 0 |
| December 2024 | 33 | 33 | 90.9% | 0 |
| January 2025 | 31 | 31 | 80.7% | 0 |
| February 2025 | 28 | 28 | 85.7% | 0 |
| March 2025 | 54 | 54 | 79.6% | 0 |
| April 2025 | 30 | 30 | 66.7% | 0 |
| May 2025 | 31 | 31 | 58.1% | 0 |
| June 2025 | 30 | 30 | 56.7% | 0 |
| July 2025 | 31 | 31 | 51.6% | 0 |
| August 2025 | 44 | 43 | 72.1% | 1 |
| September 2025 | 54 | 54 | 55.6% | 0 |
| October 2025 | 31 | 31 | 83.9% | 0 |
| November 2025 | 29 | 29 | 75.9% | 0 |
| December 2025 | 45 | 45 | 77.8% | 0 |
| January 2026 | 36 | 36 | 83.3% | 0 |
| February 2026 | 45 | 45 | 77.8% | 0 |
| March 2026 | 62 | 60 | 81.7% | 2 |
| April 2026 | 59 | 59 | 86.4% | 0 |
| May 2026 | 62 | 62 | 87.1% | 0 |
| June 2026 | 60 | 60 | 83.3% | 0 |
| July 2026 | 61 | 60 | 81.7% | 1 |