DL571
DL571 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Boston to San Diego. Of 958 departures recorded from October 2024 to July 2026, 80.6% left on time, according to the US BTS.
- On-time departures80.6%of 958 flights
- Average delay11.2 min
- July 202662▲ 0.0%vs July 2025
- Cancelled0.9%
- 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 | 36 | 31 | ▼ 13.9% |
| February | 28 | 35 | ▲ 25.0% |
| March | 31 | 34 | ▲ 9.7% |
| April | 30 | 30 | 0.0% |
| May | 32 | 56 | ▲ 75.0% |
| June | 53 | 60 | ▲ 13.2% |
| July | 62 | 62 | 0.0% |
| August | 62 | – | – |
| September | 60 | – | – |
| October | 36 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 272 | 308 | ▲ 13.2% |
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 | 77.1% | 78.6% | ▲ 1.9% |
| February | 96.4% | 78.8% | ▼ 18.3% |
| March | 77.4% | 76.5% | ▼ 1.2% |
| April | 93.3% | 70.0% | ▼ 25.0% |
| May | 84.4% | 87.5% | ▲ 3.7% |
| June | 90.6% | 86.7% | ▼ 4.3% |
| July | 77.4% | 77.4% | 0.0% |
| August | 75.8% | – | – |
| September | 75.0% | – | – |
| October | 61.1% | – | in progress |
| November | 79.3% | – | – |
| December | 83.3% | – | – |
| Year-to-date average (Jan–Jul) | 85.2% | 79.3% | ▼ 6.9% |
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 | 1 | 3 | ▲ 200.0% |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 5 | ▲ 400.0% |
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 99.1% 949
- Cancelled 0.9% 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 SAN Boston Logan International Airport – San Diego International Airport | 4,156 | 7.6 min | 81.3% | 656 |
| SAN BOS San Diego International Airport – Boston Logan International Airport | 4,156 | 19.2 min | 79.1% | 302 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 85.0% | 0 |
| November 2024 | 58 | 58 | 86.2% | 0 |
| December 2024 | 62 | 60 | 76.7% | 2 |
| January 2025 | 36 | 35 | 77.1% | 1 |
| February 2025 | 28 | 28 | 96.4% | 0 |
| March 2025 | 31 | 31 | 77.4% | 0 |
| April 2025 | 30 | 30 | 93.3% | 0 |
| May 2025 | 32 | 32 | 84.4% | 0 |
| June 2025 | 53 | 53 | 90.6% | 0 |
| July 2025 | 62 | 62 | 77.4% | 0 |
| August 2025 | 62 | 62 | 75.8% | 0 |
| September 2025 | 60 | 60 | 75.0% | 0 |
| October 2025 | 36 | 36 | 61.1% | 0 |
| November 2025 | 29 | 29 | 79.3% | 0 |
| December 2025 | 31 | 30 | 83.3% | 1 |
| January 2026 | 31 | 28 | 78.6% | 3 |
| February 2026 | 35 | 33 | 78.8% | 2 |
| March 2026 | 34 | 34 | 76.5% | 0 |
| April 2026 | 30 | 30 | 70.0% | 0 |
| May 2026 | 56 | 56 | 87.5% | 0 |
| June 2026 | 60 | 60 | 86.7% | 0 |
| July 2026 | 62 | 62 | 77.4% | 0 |