DL475
DL475 (Delta Air Lines) is a multi-stop service on 15 routes, busiest Boston to San Francisco. Of 714 departures recorded from October 2024 to July 2026, 71.8% left on time, according to the US BTS.
- On-time departures71.8%of 714 flights
- Average delay18.1 min
- July 202616▼ 40.7%vs July 2025
- Cancelled0.8%
- Legs flown under this number15
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 | 25 | 57 | ▲ 128.0% |
| February | 27 | 56 | ▲ 107.4% |
| March | 31 | 62 | ▲ 100.0% |
| April | 22 | 60 | ▲ 172.7% |
| May | 28 | 33 | ▲ 17.9% |
| June | 28 | 19 | ▼ 32.1% |
| July | 27 | 16 | ▼ 40.7% |
| August | 18 | – | – |
| September | 20 | – | – |
| October | 26 | – | in progress |
| November | 26 | – | – |
| December | 28 | – | – |
| Year to date (Jan–Jul) | 188 | 303 | ▲ 61.2% |
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 | 76.0% | 68.4% | ▼ 10.0% |
| February | 92.3% | 82.1% | ▼ 11.0% |
| March | 80.7% | 75.9% | ▼ 5.9% |
| April | 72.7% | 86.7% | ▲ 19.2% |
| May | 67.9% | 84.9% | ▲ 25.0% |
| June | 60.7% | 57.9% | ▼ 4.6% |
| July | 63.0% | 81.3% | ▲ 29.1% |
| August | 61.1% | – | – |
| September | 65.0% | – | – |
| October | 50.0% | – | in progress |
| November | 64.0% | – | – |
| December | 53.6% | – | – |
| Year-to-date average (Jan–Jul) | 73.3% | 76.7% | ▲ 4.6% |
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 | 0 | – |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 4 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 4 | ▲ 300.0% |
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 99.2% 708
- Cancelled 0.8% 6
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 26, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS SFO Boston Logan International Airport – San Francisco International Airport | 4,341 | 24.0 min | 66.8% | 360 |
| SLC ONT Salt Lake City International Airport – Ontario International Airport | 898 | 10.2 min | 79.2% | 122 |
| ONT SLC Ontario International Airport – Salt Lake City International Airport | 898 | 11.2 min | 80.8% | 122 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 28 | 28 | 85.7% | 0 |
| November 2024 | 42 | 42 | 57.1% | 0 |
| December 2024 | 35 | 35 | 62.9% | 0 |
| January 2025 | 25 | 25 | 76.0% | 0 |
| February 2025 | 27 | 26 | 92.3% | 1 |
| March 2025 | 31 | 31 | 80.7% | 0 |
| April 2025 | 22 | 22 | 72.7% | 0 |
| May 2025 | 28 | 28 | 67.9% | 0 |
| June 2025 | 28 | 28 | 60.7% | 0 |
| July 2025 | 27 | 27 | 63.0% | 0 |
| August 2025 | 18 | 18 | 61.1% | 0 |
| September 2025 | 20 | 20 | 65.0% | 0 |
| October 2025 | 26 | 26 | 50.0% | 0 |
| November 2025 | 26 | 25 | 64.0% | 1 |
| December 2025 | 28 | 28 | 53.6% | 0 |
| January 2026 | 57 | 57 | 68.4% | 0 |
| February 2026 | 56 | 56 | 82.1% | 0 |
| March 2026 | 62 | 58 | 75.9% | 4 |
| April 2026 | 60 | 60 | 86.7% | 0 |
| May 2026 | 33 | 33 | 84.9% | 0 |
| June 2026 | 19 | 19 | 57.9% | 0 |
| July 2026 | 16 | 16 | 81.3% | 0 |