UA1233
UA1233 (United Airlines) is a multi-stop service on 15 routes, busiest Denver to Newark. Of 1,006 departures recorded from October 2024 to July 2026, 77.9% left on time, according to the US BTS.
- On-time departures77.9%of 1,006 flights
- Average delay15.9 min
- July 202658▼ 6.5%vs July 2025
- Cancelled1.5%
- Legs flown under this number15
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 76 | ▲ 145.2% |
| February | 28 | 69 | ▲ 146.4% |
| March | 31 | 63 | ▲ 103.2% |
| April | 30 | 59 | ▲ 96.7% |
| May | 31 | 42 | ▲ 35.5% |
| June | 35 | 59 | ▲ 68.6% |
| July | 62 | 58 | ▼ 6.5% |
| August | 62 | – | – |
| September | 31 | – | – |
| October | 37 | – | in progress |
| November | 59 | – | – |
| December | 62 | – | – |
| Year to date (Jan–Jul) | 248 | 426 | ▲ 71.8% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 71.0% | 86.3% | ▲ 21.6% |
| February | 89.3% | 86.6% | ▼ 3.0% |
| March | 83.9% | 75.0% | ▼ 10.6% |
| April | 66.7% | 84.8% | ▲ 27.1% |
| May | 58.1% | 95.2% | ▲ 64.0% |
| June | 82.9% | 79.7% | ▼ 3.9% |
| July | 82.0% | 58.2% | ▼ 29.0% |
| August | 75.8% | – | – |
| September | 71.0% | – | – |
| October | 71.4% | – | in progress |
| November | 79.3% | – | – |
| December | 82.3% | – | – |
| Year-to-date average (Jan–Jul) | 76.2% | 80.8% | ▲ 6.0% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 3 | – |
| February | 0 | 2 | – |
| March | 0 | 3 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 3 | ▲ 200.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 2 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 11 | ▲ 1,000.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 98.5% 991
- Cancelled 1.5% 15
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN EWR Denver International Airport – Newark Liberty International Airport | 2,576 | 18.4 min | 74.9% | 565 |
| SFO DEN San Francisco International Airport – Denver International Airport | 1,553 | -5.6 min | 97.2% | 71 |
| EWR FLL Newark Liberty International Airport – Fort Lauderdale Hollywood International Airport | 1,717 | 12.1 min | 72.2% | 56 |
| SJC DEN Mineta San Jose International Airport – Denver International Airport | 1,522 | 1.8 min | 92.6% | 54 |
| FSD DEN Sioux Falls Regional Airport – Denver International Airport | 777 | 24.8 min | 77.8% | 36 |
| EWR IAH Newark Liberty International Airport – George Bush Intercontinental Airport | 2,250 | 17.4 min | 76.5% | 36 |
| EWR RSW Newark Liberty International Airport – Southwest Florida International Airport | 1,722 | -1.4 min | 91.4% | 35 |
| EWR RDU Newark Liberty International Airport – Raleigh-Durham International Airport | 670 | 100.2 min | 36.7% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 30 | 30 | 53.3% | 0 |
| December 2024 | 31 | 31 | 77.4% | 0 |
| January 2025 | 31 | 31 | 71.0% | 0 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 31 | 31 | 83.9% | 0 |
| April 2025 | 30 | 30 | 66.7% | 0 |
| May 2025 | 31 | 31 | 58.1% | 0 |
| June 2025 | 35 | 35 | 82.9% | 0 |
| July 2025 | 62 | 61 | 82.0% | 1 |
| August 2025 | 62 | 62 | 75.8% | 0 |
| September 2025 | 31 | 31 | 71.0% | 0 |
| October 2025 | 37 | 35 | 71.4% | 2 |
| November 2025 | 59 | 58 | 79.3% | 1 |
| December 2025 | 62 | 62 | 82.3% | 0 |
| January 2026 | 76 | 73 | 86.3% | 3 |
| February 2026 | 69 | 67 | 86.6% | 2 |
| March 2026 | 63 | 60 | 75.0% | 3 |
| April 2026 | 59 | 59 | 84.8% | 0 |
| May 2026 | 42 | 42 | 95.2% | 0 |
| June 2026 | 59 | 59 | 79.7% | 0 |
| July 2026 | 58 | 55 | 58.2% | 3 |