UA2400
UA2400 (United Airlines) is a multi-stop service on 7 routes, busiest Boston to San Francisco. Of 786 departures recorded from October 2024 to July 2026, 67.9% left on time, according to the US BTS.
- On-time departures67.9%of 786 flights
- Average delay23.1 min
- July 202627▼ 55.0%vs July 2025
- Cancelled0.9%
- Legs flown under this number7
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 | 30 | ▼ 3.2% |
| February | 28 | 42 | ▲ 50.0% |
| March | 31 | 62 | ▲ 100.0% |
| April | 30 | 61 | ▲ 103.3% |
| May | 21 | 68 | ▲ 223.8% |
| June | 35 | 29 | ▼ 17.1% |
| July | 60 | 27 | ▼ 55.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 28 | – | – |
| Year to date (Jan–Jul) | 236 | 319 | ▲ 35.2% |
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 | 93.3% | 80.0% | ▼ 14.3% |
| February | 64.3% | 85.0% | ▲ 32.2% |
| March | 58.1% | 79.0% | ▲ 36.1% |
| April | 80.0% | 59.0% | ▼ 26.2% |
| May | 81.0% | 61.8% | ▼ 23.7% |
| June | 80.0% | 42.9% | ▼ 46.4% |
| July | 70.0% | 46.2% | ▼ 34.1% |
| August | 61.3% | – | – |
| September | 46.7% | – | – |
| October | 54.8% | – | in progress |
| November | 60.0% | – | – |
| December | 59.3% | – | – |
| Year-to-date average (Jan–Jul) | 75.2% | 64.8% | ▼ 13.8% |
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 | 0 | ▼ 100.0% |
| February | 0 | 2 | – |
| 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 | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 4 | ▲ 300.0% |
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 99.1% 779
- Cancelled 0.9% 7
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 |
|---|---|---|---|---|
| BOS SFO Boston Logan International Airport – San Francisco International Airport | 4,341 | 27.8 min | 64.3% | 565 |
| SFO LAS San Francisco International Airport – Harry Reid International Airport | 665 | 9.4 min | 80.6% | 129 |
| SFO SEA San Francisco International Airport – Seattle–Tacoma International Airport | 1,093 | 12.4 min | 74.3% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 70.0% | 0 |
| December 2024 | 31 | 30 | 73.3% | 1 |
| January 2025 | 31 | 30 | 93.3% | 1 |
| February 2025 | 28 | 28 | 64.3% | 0 |
| March 2025 | 31 | 31 | 58.1% | 0 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 21 | 21 | 81.0% | 0 |
| June 2025 | 35 | 35 | 80.0% | 0 |
| July 2025 | 60 | 60 | 70.0% | 0 |
| August 2025 | 31 | 31 | 61.3% | 0 |
| September 2025 | 30 | 30 | 46.7% | 0 |
| October 2025 | 31 | 31 | 54.8% | 0 |
| November 2025 | 30 | 30 | 60.0% | 0 |
| December 2025 | 28 | 27 | 59.3% | 1 |
| January 2026 | 30 | 30 | 80.0% | 0 |
| February 2026 | 42 | 40 | 85.0% | 2 |
| March 2026 | 62 | 62 | 79.0% | 0 |
| April 2026 | 61 | 61 | 59.0% | 0 |
| May 2026 | 68 | 68 | 61.8% | 0 |
| June 2026 | 29 | 28 | 42.9% | 1 |
| July 2026 | 27 | 26 | 46.2% | 1 |