UA231
UA231 (United Airlines) is a multi-stop service on 21 routes, busiest Denver to Louisville. Of 642 departures recorded from October 2024 to April 2026, 86.0% left on time, according to the US BTS.
- On-time departures86.0%of 642 flights
- Average delay6.9 min
- April 202629▼ 3.3%vs April 2025
- Cancelled2.0%
- Legs flown under this number21
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 45 | ▲ 45.2% |
| February | 44 | 31 | ▼ 29.5% |
| March | 53 | 31 | ▼ 41.5% |
| April | 30 | 29 | ▼ 3.3% |
| May | 31 | – | – |
| June | 30 | – | – |
| July | 31 | – | – |
| August | 44 | – | – |
| September | 54 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Apr) | 158 | 136 | ▼ 13.9% |
according to the US BTS · October 2024 → April 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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 93.1% | 81.4% | ▼ 12.6% |
| February | 86.1% | 86.2% | ▲ 0.2% |
| March | 79.3% | 96.8% | ▲ 22.1% |
| April | 96.7% | 89.7% | ▼ 7.3% |
| May | 83.9% | – | – |
| June | 82.8% | – | – |
| July | 89.7% | – | – |
| August | 79.1% | – | – |
| September | 83.3% | – | – |
| October | 93.6% | – | in progress |
| November | 86.2% | – | – |
| December | 77.4% | – | – |
| Year-to-date average (Jan–Apr) | 88.8% | 88.5% | ▼ 0.3% |
according to the US BTS · October 2024 → April 2026
Average departure delay by month
according to the US BTS · October 2024 → April 2026
Cancelled departures by month
The most recent periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 2 | 0.0% |
| February | 1 | 2 | ▲ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 1 | – | – |
| July | 2 | – | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Apr) | 3 | 4 | ▲ 33.3% |
according to the US BTS · October 2024 → April 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 98.0% 629
- Cancelled 2.0% 13
Share of all recorded flights in the period, all legs. · Oct 27, 2024 → Apr 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
9Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 5 | 5 | 60.0% | 0 |
| November 2024 | 30 | 29 | 82.8% | 1 |
| December 2024 | 31 | 31 | 96.8% | 0 |
| January 2025 | 31 | 29 | 93.1% | 2 |
| February 2025 | 44 | 43 | 86.1% | 1 |
| March 2025 | 53 | 53 | 79.3% | 0 |
| April 2025 | 30 | 30 | 96.7% | 0 |
| May 2025 | 31 | 31 | 83.9% | 0 |
| June 2025 | 30 | 29 | 82.8% | 1 |
| July 2025 | 31 | 29 | 89.7% | 2 |
| August 2025 | 44 | 43 | 79.1% | 1 |
| September 2025 | 54 | 54 | 83.3% | 0 |
| October 2025 | 31 | 31 | 93.6% | 0 |
| November 2025 | 30 | 29 | 86.2% | 1 |
| December 2025 | 31 | 31 | 77.4% | 0 |
| January 2026 | 45 | 43 | 81.4% | 2 |
| February 2026 | 31 | 29 | 86.2% | 2 |
| March 2026 | 31 | 31 | 96.8% | 0 |
| April 2026 | 29 | 29 | 89.7% | 0 |