Flight profile · Delta Air Lines
DL639
Los Angeles (LAX) to Boston (BOS) · scheduled 7:55 AM – 4:17 PM
How DL639 performs
559 operations, 2024-12-19 to 2026-06-30.
DL639 arrived on time 84.6% of the time, against 80.5% for all LAX → BOS flights — this specific departure is 4.1 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 3.5 points better.
Source: US DOT Bureau of Transportation Statistics · 559 operations between 2024-12-19 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL639 | 84.6% | 1.43% | -6 min | 4.4% | 559 |
| Delta Air Lines on LAX → BOS | 81.0% | 0.83% | -7 min | 6.7% | 3,494 |
| All LAX → BOS flights | 80.5% | 0.74% | -8 min | 7.2% | 13,840 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-12-19 to 2026-06-30
Other routes DL639 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 |
|---|---|---|---|
| LAS→ATL Las Vegas to Atlanta | 2024-11-11 – 2024-12-18 | 36 | — |
| PDX→ATL Portland to Atlanta | 2024-10-07 – 2024-10-25 | 19 | — |
| ATL→DEN Atlanta to Denver | 2024-09-09 – 2024-10-06 | 28 | — |
| DEN→ATL Denver to Atlanta | 2024-09-09 – 2024-10-06 | 28 | — |
| LGA→MCI New York to Kansas City | 2024-08-11 – 2024-09-08 | 26 | — |
| MCI→LGA Kansas City to New York | 2024-09-08 – 2024-09-08 | 1 | — |
| DTW→LAX Detroit to Los Angeles | 2024-07-13 – 2024-08-24 | 6 | — |
| IAD→SEA Washington to Seattle | 2023-09-05 – 2024-06-06 | 115 | 79.3% |
| SLC→SEA Salt Lake City to Seattle | 2024-04-11 – 2024-05-06 | 16 | — |
| ORF→ATL Norfolk to Atlanta | 2024-03-10 – 2024-04-08 | 30 | — |
| ATL→HOU Atlanta to Houston | 2023-12-16 – 2023-12-30 | 13 | — |
| HOU→ATL Houston to Atlanta | 2023-12-16 – 2023-12-30 | 13 | — |
| MCO→MIA Orlando to Miami | 2023-12-07 – 2023-12-15 | 9 | — |
| MIA→MCO Miami to Orlando | 2023-12-07 – 2023-12-15 | 9 | — |
| LAX→ATL Los Angeles to Atlanta | 2023-07-01 – 2023-09-04 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route DL639 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 559 records of DL639 operating LAX → 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.