DL531
DL531 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Atlanta to San Francisco. Of 720 departures recorded from October 2024 to July 2026, 76.6% left on time, according to the US BTS.
- On-time departures76.6%of 720 flights
- Average delay13.0 min
- July 202631▼ 11.4%vs July 2025
- Cancelled0.3%
- 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 | 31 | ▲ 10.7% |
| March | 31 | 35 | ▲ 12.9% |
| April | 30 | 32 | ▲ 6.7% |
| May | 31 | 31 | 0.0% |
| June | 33 | 33 | 0.0% |
| July | 35 | 31 | ▼ 11.4% |
| August | 33 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 224 | 224 | 0.0% |
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 | 74.3% | 80.7% | ▲ 8.6% |
| February | 60.7% | 87.1% | ▲ 43.5% |
| March | 74.2% | 85.7% | ▲ 15.5% |
| April | 86.7% | 78.1% | ▼ 9.9% |
| May | 83.9% | 74.2% | ▼ 11.5% |
| June | 84.9% | 63.6% | ▼ 25.0% |
| July | 74.3% | 71.0% | ▼ 4.5% |
| August | 81.8% | – | – |
| September | 76.7% | – | – |
| October | 77.4% | – | in progress |
| November | 67.9% | – | – |
| December | 74.2% | – | – |
| Year-to-date average (Jan–Jul) | 77.0% | 77.2% | ▲ 0.3% |
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 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| 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 | 0 | ▼ 100.0% |
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 99.7% 718
- Cancelled 0.3% 2
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 |
|---|---|---|---|---|
| ATL SFO Hartsfield Jackson Atlanta International Airport – San Francisco International Airport | 3,435 | 10.3 min | 79.1% | 389 |
| SFO ATL San Francisco International Airport – Hartsfield Jackson Atlanta International Airport | 3,435 | 16.1 min | 73.6% | 331 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 85.0% | 0 |
| November 2024 | 40 | 40 | 70.0% | 0 |
| December 2024 | 38 | 38 | 71.1% | 0 |
| January 2025 | 36 | 35 | 74.3% | 1 |
| February 2025 | 28 | 28 | 60.7% | 0 |
| March 2025 | 31 | 31 | 74.2% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 31 | 83.9% | 0 |
| June 2025 | 33 | 33 | 84.9% | 0 |
| July 2025 | 35 | 35 | 74.3% | 0 |
| August 2025 | 33 | 33 | 81.8% | 0 |
| September 2025 | 30 | 30 | 76.7% | 0 |
| October 2025 | 31 | 31 | 77.4% | 0 |
| November 2025 | 29 | 28 | 67.9% | 1 |
| December 2025 | 31 | 31 | 74.2% | 0 |
| January 2026 | 31 | 31 | 80.7% | 0 |
| February 2026 | 31 | 31 | 87.1% | 0 |
| March 2026 | 35 | 35 | 85.7% | 0 |
| April 2026 | 32 | 32 | 78.1% | 0 |
| May 2026 | 31 | 31 | 74.2% | 0 |
| June 2026 | 33 | 33 | 63.6% | 0 |
| July 2026 | 31 | 31 | 71.0% | 0 |