DL1655
DL1655 (Delta Air Lines) is a multi-stop service on 9 routes, busiest Boston to San Francisco. Of 722 departures recorded from October 2024 to July 2026, 72.0% left on time, according to the US BTS.
- On-time departures72.0%of 722 flights
- Average delay18.9 min
- July 202649▼ 7.5%vs July 2025
- Cancelled1.3%
- Legs flown under this number9
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 27 | ▲ 800.0% |
| February | – | 28 | – |
| March | – | 31 | – |
| April | 17 | 46 | ▲ 170.6% |
| May | 44 | 56 | ▲ 27.3% |
| June | 52 | 50 | ▼ 3.8% |
| July | 53 | 49 | ▼ 7.5% |
| August | 47 | – | – |
| September | 46 | – | – |
| October | 50 | – | in progress |
| November | 44 | – | – |
| December | 36 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 64.0% | ▼ 36.0% |
| February | – | 74.1% | – |
| March | – | 93.6% | – |
| April | 82.4% | 73.9% | ▼ 10.2% |
| May | 68.2% | 60.7% | ▼ 11.0% |
| June | 71.2% | 44.0% | ▼ 38.2% |
| July | 79.3% | 76.6% | ▼ 3.3% |
| August | 74.5% | – | – |
| September | 58.7% | – | – |
| October | 65.3% | – | in progress |
| November | 82.9% | – | – |
| December | 88.9% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 2 | – |
| February | – | 1 | – |
| March | – | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | in progress |
| November | 3 | – | – |
| 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 98.8% 713
- Cancelled 1.2% 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 SFO Boston Logan International Airport – San Francisco International Airport | 4,341 | 18.4 min | 73.6% | 445 |
| SFO BOS San Francisco International Airport – Boston Logan International Airport | 4,341 | 22.9 min | 66.2% | 231 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 3 | 3 | 100.0% | 0 |
| November 2024 | 18 | 18 | 94.4% | 0 |
| December 2024 | 22 | 22 | 72.7% | 0 |
| January 2025 | 3 | 3 | 100.0% | 0 |
| April 2025 | 17 | 17 | 82.4% | 0 |
| May 2025 | 44 | 44 | 68.2% | 0 |
| June 2025 | 52 | 52 | 71.2% | 0 |
| July 2025 | 53 | 53 | 79.3% | 0 |
| August 2025 | 47 | 47 | 74.5% | 0 |
| September 2025 | 46 | 46 | 58.7% | 0 |
| October 2025 | 50 | 49 | 65.3% | 1 |
| November 2025 | 44 | 41 | 82.9% | 3 |
| December 2025 | 36 | 36 | 88.9% | 0 |
| January 2026 | 27 | 25 | 64.0% | 2 |
| February 2026 | 28 | 27 | 74.1% | 1 |
| March 2026 | 31 | 31 | 93.6% | 0 |
| April 2026 | 46 | 46 | 73.9% | 0 |
| May 2026 | 56 | 56 | 60.7% | 0 |
| June 2026 | 50 | 50 | 44.0% | 0 |
| July 2026 | 49 | 47 | 76.6% | 2 |