Flight profile · United Airlines
UA311
Boston (BOS) to Los Angeles (LAX) · scheduled 8:30 AM – 12:05 PM
How UA311 performs
930 operations, 2023-07-01 to 2026-03-28.
UA311 arrived on time 86.4% of the time, against 77.5% for all BOS → LAX flights — this specific departure is 8.9 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 5.8 points better.
Source: US DOT Bureau of Transportation Statistics · 930 operations between 2023-07-01 to 2026-03-28
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA311 | 86.4% | 1.29% | -9 min | 3.1% | 930 |
| United Airlines on BOS → LAX | 80.6% | 0.80% | -6 min | 6.5% | 2,245 |
| All BOS → LAX flights | 77.5% | 0.76% | -7 min | 8.3% | 13,833 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-03-28
By day of week
Does UA311 run worse on particular days?
Tuesday is historically the most reliable day and Friday the least, a gap of 9.9 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-03-28 · Days with fewer than 120 operations are not scored.
Other routes UA311 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route UA311 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 930 records of UA311 operating BOS → LAX, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.