UA251
UA251 (United Airlines) is a multi-stop service on 17 routes, busiest Dulles to New Orleans. Of 710 departures recorded from October 2024 to July 2026, 86.9% left on time, according to the US BTS.
- On-time departures86.9%of 710 flights
- Average delay9.0 min
- July 202631▼ 8.8%vs July 2025
- Cancelled0.4%
- Legs flown under this number17
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 | 31 | 31 | 0.0% |
| February | 40 | 28 | ▼ 30.0% |
| March | 34 | 31 | ▼ 8.8% |
| April | 30 | 30 | 0.0% |
| May | 31 | 40 | ▲ 29.0% |
| June | 31 | 51 | ▲ 64.5% |
| July | 34 | 31 | ▼ 8.8% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 33 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 231 | 242 | ▲ 4.8% |
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 | 100.0% | 86.7% | ▼ 13.3% |
| February | 92.5% | 82.1% | ▼ 11.2% |
| March | 97.1% | 74.2% | ▼ 23.6% |
| April | 93.3% | 96.7% | ▲ 3.6% |
| May | 80.7% | 92.5% | ▲ 14.7% |
| June | 74.2% | 80.4% | ▲ 8.4% |
| July | 67.7% | 96.8% | ▲ 43.0% |
| August | 77.4% | – | – |
| September | 96.7% | – | – |
| October | 96.8% | – | in progress |
| November | 78.8% | – | – |
| December | 71.0% | – | – |
| Year-to-date average (Jan–Jul) | 86.5% | 87.0% | ▲ 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 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
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 99.6% 707
- Cancelled 0.4% 3
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| IAD MSY Washington Dulles International Airport – Louis Armstrong New Orleans International Airport | 1,537 | 14.5 min | 82.5% | 356 |
| ABQ IAH Albuquerque International Sunport – George Bush Intercontinental Airport | 1,196 | 0.2 min | 94.4% | 72 |
| COS DEN City of Colorado Springs Municipal Airport – Denver International Airport | 117 | 0.1 min | 92.2% | 52 |
| BDL IAD Bradley International Airport – Washington Dulles International Airport | 523 | 5.2 min | 88.2% | 51 |
| LAX IAD Los Angeles International Airport – Washington Dulles International Airport | 3,674 | -2.0 min | 97.4% | 39 |
| IAH TPA George Bush Intercontinental Airport – Tampa International Airport | 1,265 | 24.1 min | 70.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 30 | 29 | 86.2% | 1 |
| December 2024 | 31 | 30 | 96.7% | 1 |
| January 2025 | 31 | 31 | 100.0% | 0 |
| February 2025 | 40 | 40 | 92.5% | 0 |
| March 2025 | 34 | 34 | 97.1% | 0 |
| April 2025 | 30 | 30 | 93.3% | 0 |
| May 2025 | 31 | 31 | 80.7% | 0 |
| June 2025 | 31 | 31 | 74.2% | 0 |
| July 2025 | 34 | 34 | 67.7% | 0 |
| August 2025 | 31 | 31 | 77.4% | 0 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 31 | 31 | 96.8% | 0 |
| November 2025 | 33 | 33 | 78.8% | 0 |
| December 2025 | 31 | 31 | 71.0% | 0 |
| January 2026 | 31 | 30 | 86.7% | 1 |
| February 2026 | 28 | 28 | 82.1% | 0 |
| March 2026 | 31 | 31 | 74.2% | 0 |
| April 2026 | 30 | 30 | 96.7% | 0 |
| May 2026 | 40 | 40 | 92.5% | 0 |
| June 2026 | 51 | 51 | 80.4% | 0 |
| July 2026 | 31 | 31 | 96.8% | 0 |