Flight profile · Delta Air Lines
DL2639
New York (JFK) to Boston (BOS) · scheduled 9:00 PM – 10:27 PM
How DL2639 performs
713 operations, 2024-06-07 to 2026-06-30.
DL2639 arrived on time 66.7% of the time, against 75.1% for all JFK → BOS flights — this specific departure is 8.4 percentage points worse than the route as a whole. Against Delta Air Lines’s own flights on this route it is 6.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 713 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL2639 | 66.7% | 1.96% | -5 min | 18.0% | 713 |
| Delta Air Lines on JFK → BOS | 72.8% | 1.32% | -8 min | 13.4% | 1,212 |
| All JFK → BOS flights | 75.1% | 3.09% | -8 min | 11.3% | 16,852 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes DL2639 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.
Because the same number has served different journeys, the statistics above describe only the route DL2639 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 713 records of DL2639 operating JFK → 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.