UA1399
UA1399 (United Airlines) is a multi-stop service on 19 routes, busiest Denver to Seattle. Of 733 departures recorded from October 2024 to July 2026, 81.9% left on time, according to the US BTS.
- On-time departures81.9%of 733 flights
- Average delay11.7 min
- July 202630▲ 50.0%vs July 2025
- Cancelled1.4%
- Legs flown under this number19
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 | 43 | 31 | ▼ 27.9% |
| February | 28 | 28 | 0.0% |
| March | 31 | 31 | 0.0% |
| April | 30 | 30 | 0.0% |
| May | 31 | 51 | ▲ 64.5% |
| June | 30 | 30 | 0.0% |
| July | 20 | 30 | ▲ 50.0% |
| August | 27 | – | – |
| September | 22 | – | – |
| October | 32 | – | in progress |
| November | 53 | – | – |
| December | 32 | – | – |
| Year to date (Jan–Jul) | 213 | 231 | ▲ 8.5% |
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 | 83.3% | 86.7% | ▲ 4.0% |
| February | 60.7% | 96.3% | ▲ 58.6% |
| March | 96.8% | 76.7% | ▼ 20.8% |
| April | 86.7% | 86.7% | 0.0% |
| May | 73.3% | 84.3% | ▲ 15.0% |
| June | 56.7% | 69.0% | ▲ 21.7% |
| July | 95.0% | 41.4% | ▼ 56.4% |
| August | 88.5% | – | – |
| September | 72.7% | – | – |
| October | 78.1% | – | in progress |
| November | 82.4% | – | – |
| December | 87.5% | – | – |
| Year-to-date average (Jan–Jul) | 78.9% | 77.3% | ▼ 2.1% |
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 | 1 | 1 | 0.0% |
| February | 0 | 1 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 5 | ▲ 150.0% |
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 98.6% 723
- Cancelled 1.4% 10
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 | 95.0% | 0 |
| November 2024 | 30 | 30 | 93.3% | 0 |
| December 2024 | 73 | 73 | 94.5% | 0 |
| January 2025 | 43 | 42 | 83.3% | 1 |
| February 2025 | 28 | 28 | 60.7% | 0 |
| March 2025 | 31 | 31 | 96.8% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 30 | 73.3% | 1 |
| June 2025 | 30 | 30 | 56.7% | 0 |
| July 2025 | 20 | 20 | 95.0% | 0 |
| August 2025 | 27 | 26 | 88.5% | 1 |
| September 2025 | 22 | 22 | 72.7% | 0 |
| October 2025 | 32 | 32 | 78.1% | 0 |
| November 2025 | 53 | 51 | 82.4% | 2 |
| December 2025 | 32 | 32 | 87.5% | 0 |
| January 2026 | 31 | 30 | 86.7% | 1 |
| February 2026 | 28 | 27 | 96.3% | 1 |
| March 2026 | 31 | 30 | 76.7% | 1 |
| April 2026 | 30 | 30 | 86.7% | 0 |
| May 2026 | 51 | 51 | 84.3% | 0 |
| June 2026 | 30 | 29 | 69.0% | 1 |
| July 2026 | 30 | 29 | 41.4% | 1 |