UA631
UA631 (United Airlines) is a multi-stop service on 20 routes, busiest Denver to Phoenix. Of 783 departures recorded from October 2024 to May 2026, 82.7% left on time, according to the US BTS.
- On-time departures82.7%of 783 flights
- Average delay9.7 min
- May 202631▲ 0.0%vs May 2025
- Cancelled0.9%
- Legs flown under this number20
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 49 | ▲ 58.1% |
| February | 28 | 57 | ▲ 103.6% |
| March | 48 | 76 | ▲ 58.3% |
| April | 30 | 47 | ▲ 56.7% |
| May | 31 | 31 | 0.0% |
| June | 30 | – | – |
| July | 31 | – | – |
| August | 44 | – | – |
| September | 53 | – | – |
| October | 33 | – | in progress |
| November | 57 | – | – |
| December | 48 | – | – |
| Year to date (Jan–May) | 168 | 260 | ▲ 54.8% |
according to the US BTS · October 2024 → May 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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 86.7% | 85.7% | ▼ 1.1% |
| February | 77.8% | 84.2% | ▲ 8.3% |
| March | 81.3% | 90.8% | ▲ 11.7% |
| April | 86.7% | 93.6% | ▲ 8.0% |
| May | 83.9% | 90.3% | ▲ 7.7% |
| June | 66.7% | – | – |
| July | 76.7% | – | – |
| August | 81.4% | – | – |
| September | 81.1% | – | – |
| October | 72.7% | – | in progress |
| November | 74.1% | – | – |
| December | 79.2% | – | – |
| Year-to-date average (Jan–May) | 83.2% | 88.9% | ▲ 6.8% |
according to the US BTS · October 2024 → May 2026
Average departure delay by month
according to the US BTS · October 2024 → May 2026
Cancelled departures by month
The most recent periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | – | – |
| July | 1 | – | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 0 | – | – |
| Year to date (Jan–May) | 2 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → May 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 99.1% 776
- Cancelled 0.9% 7
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → May 20, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
10Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 11 | 11 | 100.0% | 0 |
| November 2024 | 19 | 19 | 73.7% | 0 |
| December 2024 | 29 | 29 | 86.2% | 0 |
| January 2025 | 31 | 30 | 86.7% | 1 |
| February 2025 | 28 | 27 | 77.8% | 1 |
| March 2025 | 48 | 48 | 81.3% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 31 | 83.9% | 0 |
| June 2025 | 30 | 30 | 66.7% | 0 |
| July 2025 | 31 | 30 | 76.7% | 1 |
| August 2025 | 44 | 43 | 81.4% | 1 |
| September 2025 | 53 | 53 | 81.1% | 0 |
| October 2025 | 33 | 33 | 72.7% | 0 |
| November 2025 | 57 | 54 | 74.1% | 3 |
| December 2025 | 48 | 48 | 79.2% | 0 |
| January 2026 | 49 | 49 | 85.7% | 0 |
| February 2026 | 57 | 57 | 84.2% | 0 |
| March 2026 | 76 | 76 | 90.8% | 0 |
| April 2026 | 47 | 47 | 93.6% | 0 |
| May 2026 | 31 | 31 | 90.3% | 0 |