UA1734
UA1734 (United Airlines) is a multi-stop service on 10 routes, busiest Boston to Dulles. Of 991 departures recorded from October 2024 to July 2026, 93.2% left on time, according to the US BTS.
- On-time departures93.2%of 991 flights
- Average delay0.9 min
- July 202644▼ 27.9%vs July 2025
- Cancelled1.5%
- Legs flown under this number10
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 | 50 | ▲ 61.3% |
| February | 28 | 50 | ▲ 78.6% |
| March | 55 | 59 | ▲ 7.3% |
| April | 30 | 60 | ▲ 100.0% |
| May | 41 | 60 | ▲ 46.3% |
| June | 60 | 54 | ▼ 10.0% |
| July | 61 | 44 | ▼ 27.9% |
| August | 31 | – | – |
| September | 40 | – | – |
| October | 53 | – | in progress |
| November | 55 | – | – |
| December | 46 | – | – |
| Year to date (Jan–Jul) | 306 | 377 | ▲ 23.2% |
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 | 93.6% | 84.8% | ▼ 9.4% |
| February | 100.0% | 85.4% | ▼ 14.6% |
| March | 94.6% | 77.6% | ▼ 17.9% |
| April | 90.0% | 93.3% | ▲ 3.7% |
| May | 87.8% | 100.0% | ▲ 13.9% |
| June | 94.9% | 96.2% | ▲ 1.4% |
| July | 95.0% | 95.2% | ▲ 0.3% |
| August | 96.8% | – | – |
| September | 100.0% | – | – |
| October | 96.2% | – | in progress |
| November | 96.4% | – | – |
| December | 93.5% | – | – |
| Year-to-date average (Jan–Jul) | 93.7% | 90.4% | ▼ 3.5% |
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 | 4 | – |
| February | 2 | 2 | 0.0% |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 1 | 1 | 0.0% |
| July | 1 | 2 | ▲ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 11 | ▲ 175.0% |
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 98.5% 976
- Cancelled 1.5% 15
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS IAD Boston Logan International Airport – Washington Dulles International Airport | 663 | -2.4 min | 96.7% | 623 |
| IAD LAX Washington Dulles International Airport – Los Angeles International Airport | 3,674 | 13.0 min | 82.2% | 194 |
| IAD PIT Washington Dulles International Airport – Pittsburgh International Airport | 293 | -7.0 min | 100.0% | 52 |
| IAD SEA Washington Dulles International Airport – Seattle–Tacoma International Airport | 3,702 | -0.5 min | 88.2% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 33 | 33 | 93.9% | 0 |
| January 2025 | 31 | 31 | 93.6% | 0 |
| February 2025 | 28 | 26 | 100.0% | 2 |
| March 2025 | 55 | 55 | 94.6% | 0 |
| April 2025 | 30 | 30 | 90.0% | 0 |
| May 2025 | 41 | 41 | 87.8% | 0 |
| June 2025 | 60 | 59 | 94.9% | 1 |
| July 2025 | 61 | 60 | 95.0% | 1 |
| August 2025 | 31 | 31 | 96.8% | 0 |
| September 2025 | 40 | 40 | 100.0% | 0 |
| October 2025 | 53 | 53 | 96.2% | 0 |
| November 2025 | 55 | 55 | 96.4% | 0 |
| December 2025 | 46 | 46 | 93.5% | 0 |
| January 2026 | 50 | 46 | 84.8% | 4 |
| February 2026 | 50 | 48 | 85.4% | 2 |
| March 2026 | 59 | 58 | 77.6% | 1 |
| April 2026 | 60 | 60 | 93.3% | 0 |
| May 2026 | 60 | 59 | 100.0% | 1 |
| June 2026 | 54 | 53 | 96.2% | 1 |
| July 2026 | 44 | 42 | 95.2% | 2 |