DL644
DL644 (Delta Air Lines) is a multi-stop service on 10 routes, busiest Boston to New York. Of 327 departures recorded from October 2024 to July 2026, 82.5% left on time, according to the US BTS.
- On-time departures82.5%of 327 flights
- Average delay15.0 min
- July 202626▲ 0.0%vs July 2025
- Cancelled2.1%
- Legs flown under this number10
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 23 | – |
| February | – | 10 | – |
| March | 20 | 3 | ▼ 85.0% |
| April | 26 | 2 | ▼ 92.3% |
| May | 22 | – | – |
| June | 25 | 20 | ▼ 20.0% |
| July | 26 | 26 | 0.0% |
| August | 26 | – | – |
| September | 26 | – | – |
| October | 4 | – | in progress |
| November | 12 | – | – |
| December | 1 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 73.9% | – |
| February | – | 80.0% | – |
| March | 75.0% | 100.0% | ▲ 33.3% |
| April | 76.9% | 100.0% | ▲ 30.0% |
| May | 68.2% | – | – |
| June | 75.0% | 95.0% | ▲ 26.7% |
| July | 88.0% | 84.0% | ▼ 4.5% |
| August | 80.0% | – | – |
| September | 88.0% | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | 100.0% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 1 | 0.0% |
| August | 1 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 97.9% 320
- Cancelled 2.1% 7
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS LGA Boston Logan International Airport – LaGuardia Airport | 296 | 18.3 min | 83.7% | 102 |
| IAH ATL George Bush Intercontinental Airport – Hartsfield Jackson Atlanta International Airport | 1,108 | 8.1 min | 88.9% | 46 |
| MIA DTW Miami International Airport – Detroit Metropolitan Wayne County Airport | 1,847 | 21.4 min | 75.8% | 33 |
| DFW SEA Dallas Fort Worth International Airport – Seattle–Tacoma International Airport | 2,668 | 27.5 min | 67.7% | 31 |
| SNA ATL John Wayne Orange County International Airport – Hartsfield Jackson Atlanta International Airport | 3,081 | 14.0 min | 86.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 30 | 30 | 90.0% | 0 |
| December 2024 | 5 | 5 | 80.0% | 0 |
| March 2025 | 20 | 20 | 75.0% | 0 |
| April 2025 | 26 | 26 | 76.9% | 0 |
| May 2025 | 22 | 22 | 68.2% | 0 |
| June 2025 | 25 | 24 | 75.0% | 1 |
| July 2025 | 26 | 25 | 88.0% | 1 |
| August 2025 | 26 | 25 | 80.0% | 1 |
| September 2025 | 26 | 25 | 88.0% | 1 |
| October 2025 | 4 | 4 | 100.0% | 0 |
| November 2025 | 12 | 11 | 100.0% | 1 |
| December 2025 | 1 | 1 | 100.0% | 0 |
| January 2026 | 23 | 23 | 73.9% | 0 |
| February 2026 | 10 | 10 | 80.0% | 0 |
| March 2026 | 3 | 2 | 100.0% | 1 |
| April 2026 | 2 | 2 | 100.0% | 0 |
| June 2026 | 20 | 20 | 95.0% | 0 |
| July 2026 | 26 | 25 | 84.0% | 1 |