UA2129
UA2129 (United Airlines) is a multi-stop service on 3 routes, busiest San Diego to Dulles. Of 639 departures recorded from October 2024 to July 2026, 87.9% left on time, according to the US BTS.
- On-time departures87.9%of 639 flights
- Average delay10.0 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.8%
- Legs flown under this number3
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 | 27 | ▼ 12.9% |
| February | 28 | 20 | ▼ 28.6% |
| March | 31 | 24 | ▼ 22.6% |
| April | 30 | 25 | ▼ 16.7% |
| May | 46 | 28 | ▼ 39.1% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 29 | – | – |
| October | 27 | – | in progress |
| November | 30 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 227 | 185 | ▼ 18.5% |
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 | 90.0% | 76.9% | ▼ 14.5% |
| February | 92.9% | 95.0% | ▲ 2.3% |
| March | 87.1% | 91.3% | ▲ 4.8% |
| April | 86.7% | 92.0% | ▲ 6.1% |
| May | 87.0% | 82.1% | ▼ 5.5% |
| June | 93.3% | 93.3% | 0.0% |
| July | 77.4% | 76.7% | ▼ 1.0% |
| August | 87.1% | – | – |
| September | 96.4% | – | – |
| October | 92.6% | – | in progress |
| November | 83.3% | – | – |
| December | 93.1% | – | – |
| Year-to-date average (Jan–Jul) | 87.8% | 86.8% | ▼ 1.1% |
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 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 3 | ▲ 200.0% |
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 99.2% 634
- Cancelled 0.8% 5
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SAN IAD San Diego International Airport – Washington Dulles International Airport | 3,618 | 9.6 min | 88.3% | 619 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 90.0% | 0 |
| December 2024 | 31 | 31 | 83.9% | 0 |
| January 2025 | 31 | 30 | 90.0% | 1 |
| February 2025 | 28 | 28 | 92.9% | 0 |
| March 2025 | 31 | 31 | 87.1% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 46 | 46 | 87.0% | 0 |
| June 2025 | 30 | 30 | 93.3% | 0 |
| July 2025 | 31 | 31 | 77.4% | 0 |
| August 2025 | 31 | 31 | 87.1% | 0 |
| September 2025 | 29 | 28 | 96.4% | 1 |
| October 2025 | 27 | 27 | 92.6% | 0 |
| November 2025 | 30 | 30 | 83.3% | 0 |
| December 2025 | 29 | 29 | 93.1% | 0 |
| January 2026 | 27 | 26 | 76.9% | 1 |
| February 2026 | 20 | 20 | 95.0% | 0 |
| March 2026 | 24 | 23 | 91.3% | 1 |
| April 2026 | 25 | 25 | 92.0% | 0 |
| May 2026 | 28 | 28 | 82.1% | 0 |
| June 2026 | 30 | 30 | 93.3% | 0 |
| July 2026 | 31 | 30 | 76.7% | 1 |