Flight profile · Delta Air Lines
DL855
Atlanta (ATL) to Boston (BOS) · scheduled 10:00 AM – 12:37 PM
How DL855 performs
1,065 operations, 2023-07-01 to 2026-06-30.
DL855 arrived on time 88.4% of the time, against 77.1% for all ATL → BOS flights — this specific departure is 11.3 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 9.3 points better.
Source: US DOT Bureau of Transportation Statistics · 1,065 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL855 | 88.4% | 0.85% | -8 min | 2.1% | 1,065 |
| Delta Air Lines on ATL → BOS | 79.1% | 1.01% | -6 min | 6.5% | 10,893 |
| All ATL → BOS flights | 77.1% | 1.26% | -6 min | 7.9% | 15,009 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does DL855 run worse on particular days?
Thursday is historically the most reliable day and Sunday 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 DL855 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 |
|---|---|---|---|
| LGB→SLC Long Beach to Salt Lake City | 2024-05-07 – 2024-06-06 | 31 | — |
| SLC→LGB Salt Lake City to Long Beach | 2024-05-07 – 2024-06-06 | 31 | — |
Because the same number has served different journeys, the statistics above describe only the route DL855 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,065 records of DL855 operating ATL → BOS, 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.