DL1251
DL1251 (Delta Air Lines) is a multi-stop service on 3 routes, busiest Atlanta to Tucson. Of 666 departures recorded from October 2024 to July 2026, 77.7% left on time, according to the US BTS.
- On-time departures77.7%of 666 flights
- Average delay12.3 min
- July 202631▲ 0.0%vs July 2025
- Cancelled1.5%
- Legs flown under this number3
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 | 35 | 23 | ▼ 34.3% |
| February | 28 | 20 | ▼ 28.6% |
| March | 31 | 30 | ▼ 3.2% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 43 | – | – |
| Year to date (Jan–Jul) | 216 | 195 | ▼ 9.7% |
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 | 75.8% | 78.3% | ▲ 3.3% |
| February | 75.0% | 80.0% | ▲ 6.7% |
| March | 67.7% | 78.6% | ▲ 16.0% |
| April | 76.7% | 96.7% | ▲ 26.1% |
| May | 77.4% | 77.4% | 0.0% |
| June | 62.1% | 90.0% | ▲ 45.0% |
| July | 60.0% | 45.2% | ▼ 24.7% |
| August | 76.7% | – | – |
| September | 96.7% | – | – |
| October | 87.1% | – | in progress |
| November | 79.3% | – | – |
| December | 78.1% | – | – |
| Year-to-date average (Jan–Jul) | 70.7% | 78.0% | ▲ 10.4% |
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 | 2 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 4 | 2 | ▼ 50.0% |
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 98.5% 656
- Cancelled 1.5% 10
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ATL TUS Hartsfield Jackson Atlanta International Airport – Tucson International Airport | 2,475 | 13.1 min | 76.8% | 603 |
| GSP ATL Greenville-Spartanburg International Airport – Hartsfield Jackson Atlanta International Airport | 247 | 4.0 min | 87.5% | 33 |
| ATL GSP Hartsfield Jackson Atlanta International Airport – Greenville-Spartanburg International Airport | 247 | 6.2 min | 86.2% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 75.0% | 0 |
| November 2024 | 30 | 30 | 90.0% | 0 |
| December 2024 | 40 | 40 | 85.0% | 0 |
| January 2025 | 35 | 33 | 75.8% | 2 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 31 | 31 | 67.7% | 0 |
| April 2025 | 30 | 30 | 76.7% | 0 |
| May 2025 | 31 | 31 | 77.4% | 0 |
| June 2025 | 30 | 29 | 62.1% | 1 |
| July 2025 | 31 | 30 | 60.0% | 1 |
| August 2025 | 31 | 30 | 76.7% | 1 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 30 | 29 | 79.3% | 1 |
| December 2025 | 43 | 41 | 78.1% | 2 |
| January 2026 | 23 | 23 | 78.3% | 0 |
| February 2026 | 20 | 20 | 80.0% | 0 |
| March 2026 | 30 | 28 | 78.6% | 2 |
| April 2026 | 30 | 30 | 96.7% | 0 |
| May 2026 | 31 | 31 | 77.4% | 0 |
| June 2026 | 30 | 30 | 90.0% | 0 |
| July 2026 | 31 | 31 | 45.2% | 0 |