DL1623
DL1623 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Salt Lake City to Denver. Of 958 departures recorded from October 2024 to July 2026, 83.8% left on time, according to the US BTS.
- On-time departures83.8%of 958 flights
- Average delay9.0 min
- July 202661▲ 1.7%vs July 2025
- Cancelled0.6%
- 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 | 29 | ▼ 6.5% |
| February | 28 | 45 | ▲ 60.7% |
| March | 31 | 62 | ▲ 100.0% |
| April | 30 | 42 | ▲ 40.0% |
| May | 31 | 56 | ▲ 80.6% |
| June | 53 | 57 | ▲ 7.5% |
| July | 60 | 61 | ▲ 1.7% |
| August | 62 | – | – |
| September | 57 | – | – |
| October | 56 | – | in progress |
| November | 55 | – | – |
| December | 50 | – | – |
| Year to date (Jan–Jul) | 264 | 352 | ▲ 33.3% |
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 | 90.3% | 89.7% | ▼ 0.7% |
| February | 82.1% | 83.7% | ▲ 1.9% |
| March | 80.7% | 87.1% | ▲ 8.0% |
| April | 86.7% | 78.6% | ▼ 9.3% |
| May | 80.7% | 96.4% | ▲ 19.6% |
| June | 79.3% | 80.7% | ▲ 1.8% |
| July | 72.4% | 72.1% | ▼ 0.4% |
| August | 77.4% | – | – |
| September | 96.5% | – | – |
| October | 87.5% | – | in progress |
| November | 88.7% | – | – |
| December | 88.0% | – | – |
| Year-to-date average (Jan–Jul) | 81.7% | 84.0% | ▲ 2.8% |
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 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 2 | 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 99.4% 952
- Cancelled 0.6% 6
Share of all recorded flights in the period, all legs. · Oct 13, 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 |
|---|---|---|---|---|
| SLC DEN Salt Lake City International Airport – Denver International Airport | 628 | 7.1 min | 84.9% | 633 |
| DEN SLC Denver International Airport – Salt Lake City International Airport | 628 | 12.7 min | 81.7% | 325 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 91.7% | 0 |
| November 2024 | 19 | 19 | 68.4% | 0 |
| December 2024 | 31 | 31 | 87.1% | 0 |
| January 2025 | 31 | 31 | 90.3% | 0 |
| February 2025 | 28 | 28 | 82.1% | 0 |
| March 2025 | 31 | 31 | 80.7% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 31 | 80.7% | 0 |
| June 2025 | 53 | 53 | 79.3% | 0 |
| July 2025 | 60 | 58 | 72.4% | 2 |
| August 2025 | 62 | 62 | 77.4% | 0 |
| September 2025 | 57 | 57 | 96.5% | 0 |
| October 2025 | 56 | 56 | 87.5% | 0 |
| November 2025 | 55 | 53 | 88.7% | 2 |
| December 2025 | 50 | 50 | 88.0% | 0 |
| January 2026 | 29 | 29 | 89.7% | 0 |
| February 2026 | 45 | 43 | 83.7% | 2 |
| March 2026 | 62 | 62 | 87.1% | 0 |
| April 2026 | 42 | 42 | 78.6% | 0 |
| May 2026 | 56 | 56 | 96.4% | 0 |
| June 2026 | 57 | 57 | 80.7% | 0 |
| July 2026 | 61 | 61 | 72.1% | 0 |