DL1509
DL1509 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Houston to Atlanta. Of 1,316 departures recorded from October 2024 to July 2026, 88.0% left on time, according to the US BTS.
- On-time departures88.0%of 1,316 flights
- Average delay4.0 min
- July 202662▲ 0.0%vs July 2025
- Cancelled2.4%
- 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 | 62 | 62 | 0.0% |
| February | 56 | 56 | 0.0% |
| March | 62 | 62 | 0.0% |
| April | 60 | 60 | 0.0% |
| May | 62 | 62 | 0.0% |
| June | 60 | 60 | 0.0% |
| July | 62 | 62 | 0.0% |
| August | 62 | – | – |
| September | 60 | – | – |
| October | 62 | – | in progress |
| November | 60 | – | – |
| December | 62 | – | – |
| Year to date (Jan–Jul) | 424 | 424 | 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 | 82.1% | 86.2% | ▲ 5.0% |
| February | 83.6% | 83.9% | ▲ 0.3% |
| March | 91.9% | 89.1% | ▼ 3.1% |
| April | 90.0% | 96.7% | ▲ 7.4% |
| May | 85.5% | 89.3% | ▲ 4.5% |
| June | 84.5% | 91.7% | ▲ 8.5% |
| July | 87.1% | 88.3% | ▲ 1.4% |
| August | 82.3% | – | – |
| September | 100.0% | – | – |
| October | 95.2% | – | in progress |
| November | 83.9% | – | – |
| December | 82.3% | – | – |
| Year-to-date average (Jan–Jul) | 86.4% | 89.3% | ▲ 3.4% |
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 | 6 | 4 | ▼ 33.3% |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 7 | – |
| April | 0 | 0 | – |
| May | 0 | 6 | – |
| June | 2 | 0 | ▼ 100.0% |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 4 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 9 | 19 | ▲ 111.1% |
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 97.6% 1,284
- Cancelled 2.4% 32
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 |
|---|---|---|---|---|
| HOU ATL William P. Hobby Airport – Hartsfield Jackson Atlanta International Airport | 1,118 | 5.8 min | 84.9% | 658 |
| ATL HOU Hartsfield Jackson Atlanta International Airport – William P. Hobby Airport | 1,118 | 2.2 min | 91.1% | 658 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 90.0% | 0 |
| November 2024 | 60 | 60 | 88.3% | 0 |
| December 2024 | 62 | 62 | 83.9% | 0 |
| January 2025 | 62 | 56 | 82.1% | 6 |
| February 2025 | 56 | 55 | 83.6% | 1 |
| March 2025 | 62 | 62 | 91.9% | 0 |
| April 2025 | 60 | 60 | 90.0% | 0 |
| May 2025 | 62 | 62 | 85.5% | 0 |
| June 2025 | 60 | 58 | 84.5% | 2 |
| July 2025 | 62 | 62 | 87.1% | 0 |
| August 2025 | 62 | 62 | 82.3% | 0 |
| September 2025 | 60 | 60 | 100.0% | 0 |
| October 2025 | 62 | 62 | 95.2% | 0 |
| November 2025 | 60 | 56 | 83.9% | 4 |
| December 2025 | 62 | 62 | 82.3% | 0 |
| January 2026 | 62 | 58 | 86.2% | 4 |
| February 2026 | 56 | 56 | 83.9% | 0 |
| March 2026 | 62 | 55 | 89.1% | 7 |
| April 2026 | 60 | 60 | 96.7% | 0 |
| May 2026 | 62 | 56 | 89.3% | 6 |
| June 2026 | 60 | 60 | 91.7% | 0 |
| July 2026 | 62 | 60 | 88.3% | 2 |