Flight profile · Delta Air Lines
DL638
Boston (BOS) to Atlanta (ATL) · scheduled 4:55 PM – 7:50 PM
How DL638 performs
844 operations, 2023-09-05 to 2026-06-27.
DL638 arrived on time 76.0% of the time, against 78.8% for all BOS → ATL flights — this specific departure is 2.8 percentage points worse than the route as a whole. Against Delta Air Lines’s own flights on this route it is 6.3 points worse.
Source: US DOT Bureau of Transportation Statistics · 844 operations between 2023-09-05 to 2026-06-27
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL638 | 76.0% | 0.71% | -4 min | 7.1% | 844 |
| Delta Air Lines on BOS → ATL | 82.3% | 1.06% | -9 min | 6.4% | 10,882 |
| All BOS → ATL flights | 78.8% | 1.32% | -8 min | 7.8% | 15,002 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-05 to 2026-06-27
By day of week
Does DL638 run worse on particular days?
Tuesday is historically the most reliable day and Thursday the least, a gap of 12.5 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-05 to 2026-06-27 · Days with fewer than 120 operations are not scored.
Other routes DL638 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 |
|---|---|---|---|
| EWR→SLC Newark to Salt Lake City | 2026-05-09 – 2026-06-06 | 6 | — |
| BUF→DTW Buffalo to Detroit | 2026-01-05 – 2026-02-11 | 38 | — |
| SLC→JFK Salt Lake City to New York | 2025-02-13 – 2025-03-08 | 24 | — |
| BNA→BOS Nashville to Boston | 2025-01-11 – 2025-02-08 | 5 | — |
| BOS→BNA Boston to Nashville | 2025-01-11 – 2025-02-08 | 5 | — |
| SAN→ATL San Diego to Atlanta | 2023-12-07 – 2024-01-07 | 30 | — |
| ATL→DAL Atlanta to Dallas | 2023-07-10 – 2023-09-04 | 48 | — |
| ATL→TVC Atlanta to Traverse City | 2023-07-01 – 2023-07-09 | 6 | — |
| TVC→ATL Traverse City to Atlanta | 2023-07-01 – 2023-07-09 | 6 | — |
| ATL→MKE Atlanta to Milwaukee | 2023-07-03 – 2023-07-03 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route DL638 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 844 records of DL638 operating BOS → ATL, 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.