UA311
UA311 (United Airlines) is a multi-stop service on 3 routes, busiest Boston to Los Angeles. Of 638 departures recorded from October 2024 to March 2026, 86.4% left on time, according to the US BTS.
- On-time departures86.4%of 638 flights
- Average delay5.5 min
- March 202628▼ 9.7%vs March 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 periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 31 | 0.0% |
| February | 28 | 28 | 0.0% |
| March | 31 | 28 | ▼ 9.7% |
| April | 30 | – | – |
| May | 31 | – | – |
| June | 35 | – | – |
| July | 62 | – | – |
| August | 49 | – | – |
| September | 30 | – | – |
| October | 37 | – | in progress |
| November | 60 | – | – |
| December | 46 | – | – |
| Year to date (Jan–Mar) | 90 | 87 | ▼ 3.3% |
according to the US BTS · October 2024 → March 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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 83.9% | 93.1% | ▲ 11.0% |
| February | 82.1% | 84.0% | ▲ 2.3% |
| March | 77.4% | 71.4% | ▼ 7.7% |
| April | 83.3% | – | – |
| May | 87.1% | – | – |
| June | 91.4% | – | – |
| July | 85.5% | – | – |
| August | 89.8% | – | – |
| September | 100.0% | – | – |
| October | 94.6% | – | in progress |
| November | 85.0% | – | – |
| December | 93.5% | – | – |
| Year-to-date average (Jan–Mar) | 81.1% | 82.8% | ▲ 2.1% |
according to the US BTS · October 2024 → March 2026
Average departure delay by month
according to the US BTS · October 2024 → March 2026
Cancelled departures by month
The most recent periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 2 | – |
| February | 0 | 3 | – |
| March | 0 | 0 | – |
| April | 0 | – | – |
| May | 0 | – | – |
| June | 0 | – | – |
| July | 0 | – | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Mar) | 0 | 5 |
according to the US BTS · October 2024 → March 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% 633
- Cancelled 0.8% 5
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Mar 28, 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 |
|---|---|---|---|---|
| BOS LAX Boston Logan International Airport – Los Angeles International Airport | 4,193 | 6.5 min | 85.1% | 496 |
| LAX DEN Los Angeles International Airport – Denver International Airport | 1,385 | 2.5 min | 90.6% | 128 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 85.0% | 0 |
| November 2024 | 30 | 30 | 90.0% | 0 |
| December 2024 | 31 | 31 | 71.0% | 0 |
| January 2025 | 31 | 31 | 83.9% | 0 |
| February 2025 | 28 | 28 | 82.1% | 0 |
| March 2025 | 31 | 31 | 77.4% | 0 |
| April 2025 | 30 | 30 | 83.3% | 0 |
| May 2025 | 31 | 31 | 87.1% | 0 |
| June 2025 | 35 | 35 | 91.4% | 0 |
| July 2025 | 62 | 62 | 85.5% | 0 |
| August 2025 | 49 | 49 | 89.8% | 0 |
| September 2025 | 30 | 30 | 100.0% | 0 |
| October 2025 | 37 | 37 | 94.6% | 0 |
| November 2025 | 60 | 60 | 85.0% | 0 |
| December 2025 | 46 | 46 | 93.5% | 0 |
| January 2026 | 31 | 29 | 93.1% | 2 |
| February 2026 | 28 | 25 | 84.0% | 3 |
| March 2026 | 28 | 28 | 71.4% | 0 |