DL1644
DL1644 (Delta Air Lines) is a multi-stop service on 9 routes, busiest Detroit to Denver. Of 433 departures recorded from October 2024 to July 2026, 71.2% left on time, according to the US BTS.
- On-time departures71.2%of 433 flights
- Average delay16.4 min
- July 202616▼ 30.4%vs July 2025
- Cancelled0.5%
- Legs flown under this number9
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 | 27 | 17 | ▼ 37.0% |
| February | 23 | 34 | ▲ 47.8% |
| March | 22 | 36 | ▲ 63.6% |
| April | 16 | 28 | ▲ 75.0% |
| May | 17 | 19 | ▲ 11.8% |
| June | 22 | 15 | ▼ 31.8% |
| July | 23 | 16 | ▼ 30.4% |
| August | 15 | – | – |
| September | 12 | – | – |
| October | 14 | – | in progress |
| November | 2 | – | – |
| December | 17 | – | – |
| Year to date (Jan–Jul) | 150 | 165 | ▲ 10.0% |
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 | 66.7% | 87.5% | ▲ 31.2% |
| February | 82.6% | 85.3% | ▲ 3.2% |
| March | 72.7% | 77.8% | ▲ 6.9% |
| April | 56.3% | 78.6% | ▲ 39.7% |
| May | 41.2% | 73.7% | ▲ 78.9% |
| June | 40.9% | 66.7% | ▲ 63.0% |
| July | 36.4% | 68.8% | ▲ 89.1% |
| August | 40.0% | – | – |
| September | 100.0% | – | – |
| October | 85.7% | – | in progress |
| November | 50.0% | – | – |
| December | 88.2% | – | – |
| Year-to-date average (Jan–Jul) | 56.7% | 76.9% | ▲ 35.7% |
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 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 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 99.5% 431
- Cancelled 0.5% 2
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 |
|---|---|---|---|---|
| DTW DEN Detroit Metropolitan Wayne County Airport – Denver International Airport | 1,802 | 18.9 min | 67.8% | 290 |
| CLT ATL Charlotte Douglas International Airport – Hartsfield Jackson Atlanta International Airport | 365 | 21.3 min | 75.0% | 36 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 15 | 15 | 93.3% | 0 |
| November 2024 | 16 | 16 | 93.8% | 0 |
| December 2024 | 27 | 27 | 66.7% | 0 |
| January 2025 | 27 | 27 | 66.7% | 0 |
| February 2025 | 23 | 23 | 82.6% | 0 |
| March 2025 | 22 | 22 | 72.7% | 0 |
| April 2025 | 16 | 16 | 56.3% | 0 |
| May 2025 | 17 | 17 | 41.2% | 0 |
| June 2025 | 22 | 22 | 40.9% | 0 |
| July 2025 | 23 | 22 | 36.4% | 1 |
| August 2025 | 15 | 15 | 40.0% | 0 |
| September 2025 | 12 | 12 | 100.0% | 0 |
| October 2025 | 14 | 14 | 85.7% | 0 |
| November 2025 | 2 | 2 | 50.0% | 0 |
| December 2025 | 17 | 17 | 88.2% | 0 |
| January 2026 | 17 | 16 | 87.5% | 1 |
| February 2026 | 34 | 34 | 85.3% | 0 |
| March 2026 | 36 | 36 | 77.8% | 0 |
| April 2026 | 28 | 28 | 78.6% | 0 |
| May 2026 | 19 | 19 | 73.7% | 0 |
| June 2026 | 15 | 15 | 66.7% | 0 |
| July 2026 | 16 | 16 | 68.8% | 0 |