UA1239
UA1239 (United Airlines) is a multi-stop service on 21 routes, busiest Chicago to Rochester. Of 1,006 departures recorded from October 2024 to July 2026, 84.2% left on time, according to the US BTS.
- On-time departures84.2%of 1,006 flights
- Average delay9.9 min
- July 202658▲ 11.5%vs July 2025
- Cancelled0.6%
- Legs flown under this number21
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 | 49 | 31 | ▼ 36.7% |
| February | 52 | 28 | ▼ 46.2% |
| March | 25 | 31 | ▲ 24.0% |
| April | 60 | 31 | ▼ 48.3% |
| May | 31 | 60 | ▲ 93.5% |
| June | 35 | 56 | ▲ 60.0% |
| July | 52 | 58 | ▲ 11.5% |
| August | 44 | – | – |
| September | 66 | – | – |
| October | 91 | – | in progress |
| November | 87 | – | – |
| December | 41 | – | – |
| Year to date (Jan–Jul) | 304 | 295 | ▼ 3.0% |
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 | 95.9% | 90.3% | ▼ 5.8% |
| February | 84.6% | 85.7% | ▲ 1.3% |
| March | 88.0% | 70.0% | ▼ 20.5% |
| April | 90.0% | 93.6% | ▲ 3.9% |
| May | 77.4% | 81.7% | ▲ 5.5% |
| June | 74.3% | 76.8% | ▲ 3.4% |
| July | 69.2% | 77.2% | ▲ 11.5% |
| August | 83.7% | – | – |
| September | 83.3% | – | – |
| October | 93.4% | – | in progress |
| November | 83.7% | – | – |
| December | 82.5% | – | – |
| Year-to-date average (Jan–Jul) | 82.8% | 82.2% | ▼ 0.7% |
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 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 0 | 2 |
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 99.4% 1,000
- Cancelled 0.6% 6
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
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 85.0% | 0 |
| November 2024 | 29 | 29 | 96.6% | 0 |
| December 2024 | 29 | 28 | 89.3% | 1 |
| January 2025 | 49 | 49 | 95.9% | 0 |
| February 2025 | 52 | 52 | 84.6% | 0 |
| March 2025 | 25 | 25 | 88.0% | 0 |
| April 2025 | 60 | 60 | 90.0% | 0 |
| May 2025 | 31 | 31 | 77.4% | 0 |
| June 2025 | 35 | 35 | 74.3% | 0 |
| July 2025 | 52 | 52 | 69.2% | 0 |
| August 2025 | 44 | 43 | 83.7% | 1 |
| September 2025 | 66 | 66 | 83.3% | 0 |
| October 2025 | 91 | 91 | 93.4% | 0 |
| November 2025 | 87 | 86 | 83.7% | 1 |
| December 2025 | 41 | 40 | 82.5% | 1 |
| January 2026 | 31 | 31 | 90.3% | 0 |
| February 2026 | 28 | 28 | 85.7% | 0 |
| March 2026 | 31 | 30 | 70.0% | 1 |
| April 2026 | 31 | 31 | 93.6% | 0 |
| May 2026 | 60 | 60 | 81.7% | 0 |
| June 2026 | 56 | 56 | 76.8% | 0 |
| July 2026 | 58 | 57 | 77.2% | 1 |