UA1831
UA1831 (United Airlines) is a multi-stop service on 5 routes, busiest Atlanta to Dulles. Of 881 departures recorded from October 2024 to July 2026, 76.7% left on time, according to the US BTS.
- On-time departures76.7%of 881 flights
- Average delay26.4 min
- July 202662▲ 100.0%vs July 2025
- Cancelled1.0%
- Legs flown under this number5
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 | 35 | ▲ 12.9% |
| February | 28 | 60 | ▲ 114.3% |
| March | 54 | 64 | ▲ 18.5% |
| April | 30 | 60 | ▲ 100.0% |
| May | 31 | 62 | ▲ 100.0% |
| June | 30 | 60 | ▲ 100.0% |
| July | 31 | 62 | ▲ 100.0% |
| August | 28 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 43 | – | – |
| Year to date (Jan–Jul) | 235 | 403 | ▲ 71.5% |
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 | 74.2% | 73.5% | ▼ 0.9% |
| February | 78.6% | 84.8% | ▲ 7.9% |
| March | 79.6% | 69.8% | ▼ 12.3% |
| April | 76.7% | 76.7% | 0.0% |
| May | 87.1% | 85.3% | ▼ 2.1% |
| June | 73.3% | 76.7% | ▲ 4.6% |
| July | 70.0% | 60.3% | ▼ 13.8% |
| August | 78.6% | – | – |
| September | 80.0% | – | – |
| October | 83.9% | – | in progress |
| November | 73.3% | – | – |
| December | 72.1% | – | – |
| Year-to-date average (Jan–Jul) | 77.1% | 75.3% | ▼ 2.3% |
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 | 1 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 1 | 4 | ▲ 300.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 8 | ▲ 700.0% |
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 99.0% 872
- Cancelled 1.0% 9
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ATL IAD Hartsfield Jackson Atlanta International Airport – Washington Dulles International Airport | 859 | 22.4 min | 77.9% | 506 |
| IAD EWR Washington Dulles International Airport – Newark Liberty International Airport | 341 | 51.5 min | 69.5% | 182 |
| IAD SAN Washington Dulles International Airport – San Diego International Airport | 3,618 | 14.2 min | 79.3% | 169 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 85.0% | 0 |
| November 2024 | 30 | 30 | 80.0% | 0 |
| December 2024 | 31 | 31 | 77.4% | 0 |
| January 2025 | 31 | 31 | 74.2% | 0 |
| February 2025 | 28 | 28 | 78.6% | 0 |
| March 2025 | 54 | 54 | 79.6% | 0 |
| April 2025 | 30 | 30 | 76.7% | 0 |
| May 2025 | 31 | 31 | 87.1% | 0 |
| June 2025 | 30 | 30 | 73.3% | 0 |
| July 2025 | 31 | 30 | 70.0% | 1 |
| August 2025 | 28 | 28 | 78.6% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 31 | 31 | 83.9% | 0 |
| November 2025 | 30 | 30 | 73.3% | 0 |
| December 2025 | 43 | 43 | 72.1% | 0 |
| January 2026 | 35 | 34 | 73.5% | 1 |
| February 2026 | 60 | 59 | 84.8% | 1 |
| March 2026 | 64 | 63 | 69.8% | 1 |
| April 2026 | 60 | 60 | 76.7% | 0 |
| May 2026 | 62 | 61 | 85.3% | 1 |
| June 2026 | 60 | 60 | 76.7% | 0 |
| July 2026 | 62 | 58 | 60.3% | 4 |