DL519
DL519 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Atlanta to Denver. Of 736 departures recorded from October 2024 to July 2026, 72.1% left on time, according to the US BTS.
- On-time departures72.1%of 736 flights
- Average delay14.2 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.7%
- 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 | 55 | 34 | ▼ 38.2% |
| February | 52 | 28 | ▼ 46.2% |
| March | 39 | 31 | ▼ 20.5% |
| 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 | 40 | – | – |
| Year to date (Jan–Jul) | 268 | 215 | ▼ 19.8% |
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 | 79.3% | 78.8% | ▼ 0.6% |
| February | 71.2% | 75.0% | ▲ 5.4% |
| March | 76.9% | 82.8% | ▲ 7.6% |
| April | 63.3% | 76.7% | ▲ 21.1% |
| May | 71.0% | 77.4% | ▲ 9.1% |
| June | 26.7% | 80.0% | ▲ 200.0% |
| July | 51.6% | 77.4% | ▲ 50.0% |
| August | 64.5% | – | – |
| September | 76.7% | – | – |
| October | 83.9% | – | in progress |
| November | 76.7% | – | – |
| December | 47.5% | – | – |
| Year-to-date average (Jan–Jul) | 62.8% | 78.3% | ▲ 24.6% |
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 | 2 | 1 | ▼ 50.0% |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 3 | ▲ 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 99.3% 731
- Cancelled 0.7% 5
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 DEN Hartsfield Jackson Atlanta International Airport – Denver International Airport | 1,927 | 13.4 min | 72.8% | 658 |
| DEN ATL Denver International Airport – Hartsfield Jackson Atlanta International Airport | 1,927 | 20.9 min | 65.8% | 78 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 30 | 30 | 83.3% | 0 |
| December 2024 | 41 | 41 | 75.6% | 0 |
| January 2025 | 55 | 53 | 79.3% | 2 |
| February 2025 | 52 | 52 | 71.2% | 0 |
| March 2025 | 39 | 39 | 76.9% | 0 |
| April 2025 | 30 | 30 | 63.3% | 0 |
| May 2025 | 31 | 31 | 71.0% | 0 |
| June 2025 | 30 | 30 | 26.7% | 0 |
| July 2025 | 31 | 31 | 51.6% | 0 |
| August 2025 | 31 | 31 | 64.5% | 0 |
| September 2025 | 30 | 30 | 76.7% | 0 |
| October 2025 | 31 | 31 | 83.9% | 0 |
| November 2025 | 30 | 30 | 76.7% | 0 |
| December 2025 | 40 | 40 | 47.5% | 0 |
| January 2026 | 34 | 33 | 78.8% | 1 |
| February 2026 | 28 | 28 | 75.0% | 0 |
| March 2026 | 31 | 29 | 82.8% | 2 |
| April 2026 | 30 | 30 | 76.7% | 0 |
| May 2026 | 31 | 31 | 77.4% | 0 |
| June 2026 | 30 | 30 | 80.0% | 0 |
| July 2026 | 31 | 31 | 77.4% | 0 |