UA1236
UA1236 (United Airlines) is a multi-stop service on 20 routes, busiest Denver to Phoenix. Of 800 departures recorded from October 2024 to July 2026, 71.9% left on time, according to the US BTS.
- On-time departures71.9%of 800 flights
- Average delay21.3 min
- July 202623▼ 54.0%vs July 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 periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 23 | 53 | ▲ 130.4% |
| February | 20 | 45 | ▲ 125.0% |
| March | 31 | 34 | ▲ 9.7% |
| April | 51 | 43 | ▼ 15.7% |
| May | 45 | 27 | ▼ 40.0% |
| June | 59 | 21 | ▼ 64.4% |
| July | 50 | 23 | ▼ 54.0% |
| August | 39 | – | – |
| September | 25 | – | – |
| October | 37 | – | in progress |
| November | 30 | – | – |
| December | 59 | – | – |
| Year to date (Jan–Jul) | 279 | 246 | ▼ 11.8% |
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 | 87.0% | 83.0% | ▼ 4.5% |
| February | 94.7% | 77.8% | ▼ 17.9% |
| March | 77.4% | 75.8% | ▼ 2.1% |
| April | 66.7% | 86.1% | ▲ 29.1% |
| May | 65.9% | 76.9% | ▲ 16.7% |
| June | 60.3% | 47.6% | ▼ 21.1% |
| July | 46.0% | 39.1% | ▼ 14.9% |
| August | 52.6% | – | – |
| September | 68.0% | – | – |
| October | 86.5% | – | in progress |
| November | 73.3% | – | – |
| December | 82.8% | – | – |
| Year-to-date average (Jan–Jul) | 71.1% | 69.5% | ▼ 2.4% |
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 | 1 | 0 | ▼ 100.0% |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 1 | 1 | 0.0% |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 0 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 3 | 2 | ▼ 33.3% |
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 99.1% 793
- Cancelled 0.9% 7
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 PHX Denver International Airport – Phoenix Sky Harbor International Airport | 968 | 27.0 min | 66.9% | 444 |
| SLC DEN Salt Lake City International Airport – Denver International Airport | 628 | 22.6 min | 64.2% | 54 |
| STL DEN St. Louis Lambert International Airport – Denver International Airport | 1,236 | 14.9 min | 78.3% | 46 |
| IAD DEN Washington Dulles International Airport – Denver International Airport | 2,332 | 24.5 min | 73.8% | 42 |
| SNA DEN John Wayne Orange County International Airport – Denver International Airport | 1,360 | 5.4 min | 89.2% | 37 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 18 | 18 | 94.4% | 0 |
| November 2024 | 22 | 22 | 86.4% | 0 |
| December 2024 | 45 | 45 | 71.1% | 0 |
| January 2025 | 23 | 23 | 87.0% | 0 |
| February 2025 | 20 | 19 | 94.7% | 1 |
| March 2025 | 31 | 31 | 77.4% | 0 |
| April 2025 | 51 | 51 | 66.7% | 0 |
| May 2025 | 45 | 44 | 65.9% | 1 |
| June 2025 | 59 | 58 | 60.3% | 1 |
| July 2025 | 50 | 50 | 46.0% | 0 |
| August 2025 | 39 | 38 | 52.6% | 1 |
| September 2025 | 25 | 25 | 68.0% | 0 |
| October 2025 | 37 | 37 | 86.5% | 0 |
| November 2025 | 30 | 30 | 73.3% | 0 |
| December 2025 | 59 | 58 | 82.8% | 1 |
| January 2026 | 53 | 53 | 83.0% | 0 |
| February 2026 | 45 | 45 | 77.8% | 0 |
| March 2026 | 34 | 33 | 75.8% | 1 |
| April 2026 | 43 | 43 | 86.1% | 0 |
| May 2026 | 27 | 26 | 76.9% | 1 |
| June 2026 | 21 | 21 | 47.6% | 0 |
| July 2026 | 23 | 23 | 39.1% | 0 |