DL1581
DL1581 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Denver to Salt Lake City. Of 648 departures recorded from October 2024 to July 2026, 90.3% left on time, according to the US BTS.
- On-time departures90.3%of 648 flights
- Average delay8.7 min
- July 202630▼ 3.2%vs July 2025
- Cancelled0.0%
- 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 | 31 | 31 | 0.0% |
| February | 28 | 28 | 0.0% |
| March | 27 | 31 | ▲ 14.8% |
| April | 26 | 29 | ▲ 11.5% |
| May | 30 | 31 | ▲ 3.3% |
| June | 30 | 27 | ▼ 10.0% |
| July | 31 | 30 | ▼ 3.2% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 203 | 207 | ▲ 2.0% |
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 | 87.1% | 93.6% | ▲ 7.4% |
| February | 96.4% | 96.4% | 0.0% |
| March | 88.9% | 77.4% | ▼ 12.9% |
| April | 84.6% | 93.1% | ▲ 10.0% |
| May | 96.7% | 96.8% | ▲ 0.1% |
| June | 90.0% | 100.0% | ▲ 11.1% |
| July | 74.2% | 90.0% | ▲ 21.3% |
| August | 96.8% | – | – |
| September | 96.7% | – | – |
| October | 90.3% | – | in progress |
| November | 93.3% | – | – |
| December | 77.4% | – | – |
| Year-to-date average (Jan–Jul) | 88.3% | 92.5% | ▲ 4.8% |
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 | 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 | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 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 100.0% 648
- Cancelled 0.0% 0
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 |
|---|---|---|---|---|
| DEN SLC Denver International Airport – Salt Lake City International Airport | 628 | 8.9 min | 90.6% | 603 |
| SLC DEN Salt Lake City International Airport – Denver International Airport | 628 | 4.8 min | 86.7% | 45 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 27 | 27 | 88.9% | 0 |
| November 2024 | 25 | 25 | 88.0% | 0 |
| December 2024 | 33 | 33 | 90.9% | 0 |
| January 2025 | 31 | 31 | 87.1% | 0 |
| February 2025 | 28 | 28 | 96.4% | 0 |
| March 2025 | 27 | 27 | 88.9% | 0 |
| April 2025 | 26 | 26 | 84.6% | 0 |
| May 2025 | 30 | 30 | 96.7% | 0 |
| June 2025 | 30 | 30 | 90.0% | 0 |
| July 2025 | 31 | 31 | 74.2% | 0 |
| August 2025 | 31 | 31 | 96.8% | 0 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 31 | 31 | 90.3% | 0 |
| November 2025 | 30 | 30 | 93.3% | 0 |
| December 2025 | 31 | 31 | 77.4% | 0 |
| January 2026 | 31 | 31 | 93.6% | 0 |
| February 2026 | 28 | 28 | 96.4% | 0 |
| March 2026 | 31 | 31 | 77.4% | 0 |
| April 2026 | 29 | 29 | 93.1% | 0 |
| May 2026 | 31 | 31 | 96.8% | 0 |
| June 2026 | 27 | 27 | 100.0% | 0 |
| July 2026 | 30 | 30 | 90.0% | 0 |