Flight profile · Delta Air Lines
DL640
San Francisco (SFO) to Atlanta (ATL) · scheduled 7:15 AM – 3:34 PM
How DL640 performs
753 operations, 2024-06-07 to 2026-06-30.
DL640 arrived on time 89.9% of the time, against 81.7% for all SFO → ATL flights — this specific departure is 8.2 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 5.7 points better.
Source: US DOT Bureau of Transportation Statistics · 753 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL640 | 89.9% | 0.66% | -10 min | 2.8% | 753 |
| Delta Air Lines on SFO → ATL | 84.3% | 0.72% | -8 min | 4.6% | 7,085 |
| All SFO → ATL flights | 81.7% | 0.93% | -7 min | 5.5% | 9,752 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes DL640 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 |
|---|---|---|---|
| JFK→DTW New York to Detroit | 2024-05-07 – 2024-06-06 | 31 | — |
| MCO→ATL Orlando to Atlanta | 2024-04-09 – 2024-05-06 | 28 | — |
| BOS→AUS Boston to Austin | 2024-03-10 – 2024-04-08 | 27 | — |
| SEA→CVG Seattle to Cincinnati / Covington | 2024-01-08 – 2024-03-09 | 62 | — |
| CVG→SEA Cincinnati / Covington to Seattle | 2024-02-05 – 2024-02-28 | 3 | — |
| BNA→DTW Nashville to Detroit | 2023-12-07 – 2024-01-07 | 32 | — |
| HNL→JFK Honolulu to New York | 2023-07-01 – 2023-12-06 | 80 | — |
| BOS→PBI Boston to West Palm Beach | 2023-09-05 – 2023-11-03 | 58 | — |
| PBI→BOS West Palm Beach to Boston | 2023-09-05 – 2023-11-03 | 58 | — |
Because the same number has served different journeys, the statistics above describe only the route DL640 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 753 records of DL640 operating SFO → 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.