Flight profile · Delta Air Lines
DL571
Boston (BOS) to San Diego (SAN) · scheduled 5:20 PM – 8:59 PM
How DL571 performs
1,092 operations, 2023-07-01 to 2026-06-30.
DL571 arrived on time 71.3% of the time, against 76.3% for all BOS → SAN flights — this specific departure is 5.0 percentage points worse than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 1,092 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL571 | 71.3% | 0.92% | -2 min | 5.5% | 1,092 |
| Delta Air Lines on BOS → SAN | 71.2% | 0.91% | -2 min | 5.6% | 1,093 |
| All BOS → SAN flights | 76.3% | 0.80% | -6 min | 6.7% | 4,875 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does DL571 run worse on particular days?
Monday is historically the most reliable day and Saturday the least, a gap of 9.8 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 DL571 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 |
|---|---|---|---|
| SAN→BOS San Diego to Boston | 2023-09-05 – 2026-06-30 | 430 | 84.3% |
Because the same number has served different journeys, the statistics above describe only the route DL571 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,092 records of DL571 operating BOS → SAN, 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.