Flight profile · United Airlines
UA2400
Boston (BOS) to San Francisco (SFO) · scheduled 6:18 PM – 9:50 PM
How UA2400 performs
1,006 operations, 2023-07-01 to 2026-06-30.
UA2400 arrived on time 62.9% of the time, against 75.0% for all BOS → SFO flights — this specific departure is 12.1 percentage points worse than the route as a whole. Against United Airlines’s own flights on this route it is 16.2 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,006 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA2400 | 62.9% | 1.99% | 3 min | 15.8% | 1,006 |
| United Airlines on BOS → SFO | 79.1% | 1.18% | -8 min | 7.6% | 5,334 |
| All BOS → SFO flights | 75.0% | 0.96% | -6 min | 8.6% | 13,723 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA2400 run worse on particular days?
Saturday is historically the most reliable day and Thursday the least, a gap of 16.7 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes UA2400 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.
| Route | Operated | Flights | On time |
|---|---|---|---|
| SFO→LAS San Francisco to Las Vegas | 2026-01-06 – 2026-05-20 | 129 | 79.8% |
| IAH→BOS Houston to Boston | 2026-04-30 – 2026-05-20 | 21 | — |
| IAH→BNA Houston to Nashville | 2025-10-31 – 2025-10-31 | 1 | — |
| SFO→SEA San Francisco to Seattle | 2025-06-26 – 2025-07-31 | 35 | — |
| SFO→SBA San Francisco to Santa Barbara | 2025-05-01 – 2025-05-18 | 11 | — |
| DEN→STL Denver to St. Louis | 2025-03-06 – 2025-03-29 | 24 | — |
| SFO→EUG San Francisco to Eugene | 2023-10-01 – 2023-10-28 | 26 | — |
| SFO→ONT San Francisco to Ontario | 2023-09-29 – 2023-09-30 | 2 | — |
Because the same number has served different journeys, the statistics above describe only the route UA2400 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,006 records of UA2400 operating BOS → SFO, 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.