DL1780
DL1780 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Boston to San Juan. Of 1,237 departures recorded from October 2024 to July 2026, 82.7% left on time, according to the US BTS.
- On-time departures82.7%of 1,237 flights
- Average delay8.6 min
- July 202662▲ 0.0%vs July 2025
- Cancelled0.7%
- Legs flown under this number2
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 62 | 58 | ▼ 6.5% |
| February | 56 | 56 | 0.0% |
| March | 62 | 62 | 0.0% |
| April | 60 | 60 | 0.0% |
| May | 62 | 62 | 0.0% |
| June | 60 | 60 | 0.0% |
| July | 62 | 62 | 0.0% |
| August | 62 | – | – |
| September | 40 | – | – |
| October | 57 | – | in progress |
| November | 60 | – | – |
| December | 50 | – | – |
| Year to date (Jan–Jul) | 424 | 420 | ▼ 0.9% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 82.3% | 73.6% | ▼ 10.6% |
| February | 67.9% | 79.6% | ▲ 17.3% |
| March | 80.0% | 82.3% | ▲ 2.8% |
| April | 81.7% | 80.0% | ▼ 2.0% |
| May | 95.2% | 91.9% | ▼ 3.4% |
| June | 80.0% | 85.0% | ▲ 6.3% |
| July | 91.9% | 83.9% | ▼ 8.8% |
| August | 83.9% | – | – |
| September | 82.5% | – | – |
| October | 91.2% | – | in progress |
| November | 86.7% | – | – |
| December | 74.0% | – | – |
| Year-to-date average (Jan–Jul) | 82.7% | 82.3% | ▼ 0.5% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 5 | – |
| February | 0 | 2 | – |
| March | 2 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 7 | ▲ 250.0% |
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 99.3% 1,228
- Cancelled 0.7% 9
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS SJU Boston Logan International Airport – Luis Munoz Marin International Airport | 2,702 | 8.0 min | 83.0% | 658 |
| SJU BOS Luis Munoz Marin International Airport – Boston Logan International Airport | 2,702 | 9.3 min | 82.4% | 579 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 95.0% | 0 |
| November 2024 | 40 | 40 | 77.5% | 0 |
| December 2024 | 44 | 44 | 68.2% | 0 |
| January 2025 | 62 | 62 | 82.3% | 0 |
| February 2025 | 56 | 56 | 67.9% | 0 |
| March 2025 | 62 | 60 | 80.0% | 2 |
| April 2025 | 60 | 60 | 81.7% | 0 |
| May 2025 | 62 | 62 | 95.2% | 0 |
| June 2025 | 60 | 60 | 80.0% | 0 |
| July 2025 | 62 | 62 | 91.9% | 0 |
| August 2025 | 62 | 62 | 83.9% | 0 |
| September 2025 | 40 | 40 | 82.5% | 0 |
| October 2025 | 57 | 57 | 91.2% | 0 |
| November 2025 | 60 | 60 | 86.7% | 0 |
| December 2025 | 50 | 50 | 74.0% | 0 |
| January 2026 | 58 | 53 | 73.6% | 5 |
| February 2026 | 56 | 54 | 79.6% | 2 |
| March 2026 | 62 | 62 | 82.3% | 0 |
| April 2026 | 60 | 60 | 80.0% | 0 |
| May 2026 | 62 | 62 | 91.9% | 0 |
| June 2026 | 60 | 60 | 85.0% | 0 |
| July 2026 | 62 | 62 | 83.9% | 0 |