UA641
UA641 (United Airlines) is a multi-stop service on 3 routes, busiest Dulles to Boston. Of 741 departures recorded from October 2024 to July 2026, 92.1% left on time, according to the US BTS.
- On-time departures92.1%of 741 flights
- Average delay2.0 min
- July 202662▲ 100.0%vs July 2025
- Cancelled1.1%
- 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 | 18 | ▼ 41.9% |
| February | 28 | 23 | ▼ 17.9% |
| March | 31 | 32 | ▲ 3.2% |
| April | 30 | 47 | ▲ 56.7% |
| May | 28 | 56 | ▲ 100.0% |
| June | 30 | 60 | ▲ 100.0% |
| July | 31 | 62 | ▲ 100.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 209 | 298 | ▲ 42.6% |
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 | 86.7% | 81.3% | ▼ 6.3% |
| February | 85.2% | 100.0% | ▲ 17.4% |
| March | 90.3% | 93.8% | ▲ 3.8% |
| April | 100.0% | 89.4% | ▼ 10.6% |
| May | 89.3% | 91.1% | ▲ 2.0% |
| June | 96.7% | 98.3% | ▲ 1.7% |
| July | 83.9% | 91.8% | ▲ 9.5% |
| August | 87.1% | – | – |
| September | 93.3% | – | – |
| October | 93.6% | – | in progress |
| November | 100.0% | – | – |
| December | 90.3% | – | – |
| Year-to-date average (Jan–Jul) | 90.3% | 92.2% | ▲ 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 | 2 | ▲ 100.0% |
| February | 1 | 2 | ▲ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 6 | ▲ 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 98.9% 733
- Cancelled 1.1% 8
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| IAD BOS Washington Dulles International Airport – Boston Logan International Airport | 663 | 1.9 min | 91.9% | 634 |
| ATL IAD Hartsfield Jackson Atlanta International Airport – Washington Dulles International Airport | 859 | 2.4 min | 93.2% | 104 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 30 | 30 | 90.0% | 0 |
| December 2024 | 31 | 31 | 90.3% | 0 |
| January 2025 | 31 | 30 | 86.7% | 1 |
| February 2025 | 28 | 27 | 85.2% | 1 |
| March 2025 | 31 | 31 | 90.3% | 0 |
| April 2025 | 30 | 30 | 100.0% | 0 |
| May 2025 | 28 | 28 | 89.3% | 0 |
| June 2025 | 30 | 30 | 96.7% | 0 |
| July 2025 | 31 | 31 | 83.9% | 0 |
| August 2025 | 31 | 31 | 87.1% | 0 |
| September 2025 | 30 | 30 | 93.3% | 0 |
| October 2025 | 31 | 31 | 93.6% | 0 |
| November 2025 | 30 | 30 | 100.0% | 0 |
| December 2025 | 31 | 31 | 90.3% | 0 |
| January 2026 | 18 | 16 | 81.3% | 2 |
| February 2026 | 23 | 21 | 100.0% | 2 |
| March 2026 | 32 | 32 | 93.8% | 0 |
| April 2026 | 47 | 47 | 89.4% | 0 |
| May 2026 | 56 | 56 | 91.1% | 0 |
| June 2026 | 60 | 59 | 98.3% | 1 |
| July 2026 | 62 | 61 | 91.8% | 1 |