DL866
DL866 (Delta Air Lines) is a multi-stop service on 4 routes, busiest Detroit to Miami. Of 1,153 departures recorded from October 2024 to July 2026, 77.3% left on time, according to the US BTS.
- On-time departures77.3%of 1,153 flights
- Average delay14.3 min
- July 202662▲ 8.8%vs July 2025
- Cancelled1.0%
- Legs flown under this number4
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 | 37 | 31 | ▼ 16.2% |
| February | 56 | 28 | ▼ 50.0% |
| March | 62 | 55 | ▼ 11.3% |
| April | 60 | 60 | 0.0% |
| May | 55 | 62 | ▲ 12.7% |
| June | 56 | 60 | ▲ 7.1% |
| July | 57 | 62 | ▲ 8.8% |
| August | 62 | – | – |
| September | 60 | – | – |
| October | 60 | – | in progress |
| November | 60 | – | – |
| December | 50 | – | – |
| Year to date (Jan–Jul) | 383 | 358 | ▼ 6.5% |
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 | 70.3% | 80.0% | ▲ 13.8% |
| February | 69.6% | 96.4% | ▲ 38.5% |
| March | 64.5% | 73.6% | ▲ 14.0% |
| April | 76.7% | 81.7% | ▲ 6.5% |
| May | 80.0% | 71.0% | ▼ 11.3% |
| June | 58.9% | 71.7% | ▲ 21.6% |
| July | 82.1% | 66.7% | ▼ 18.8% |
| August | 82.3% | – | – |
| September | 76.7% | – | – |
| October | 88.3% | – | in progress |
| November | 93.0% | – | – |
| December | 75.0% | – | – |
| Year-to-date average (Jan–Jul) | 71.7% | 77.3% | ▲ 7.7% |
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 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 2 | ▲ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 1 | 5 | ▲ 400.0% |
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 99.0% 1,142
- Cancelled 1.0% 11
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DTW MIA Detroit Metropolitan Wayne County Airport – Miami International Airport | 1,847 | 10.7 min | 80.8% | 507 |
| MIA DTW Miami International Airport – Detroit Metropolitan Wayne County Airport | 1,847 | 25.5 min | 68.2% | 386 |
| JAN ATL Jackson-Medgar Wiley Evers International Airport – Hartsfield Jackson Atlanta International Airport | 547 | 4.2 min | 84.3% | 130 |
| ATL JAN Hartsfield Jackson Atlanta International Airport – Jackson-Medgar Wiley Evers International Airport | 547 | 5.3 min | 84.4% | 130 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 38 | 38 | 92.1% | 0 |
| November 2024 | 54 | 54 | 92.6% | 0 |
| December 2024 | 28 | 28 | 67.9% | 0 |
| January 2025 | 37 | 37 | 70.3% | 0 |
| February 2025 | 56 | 56 | 69.6% | 0 |
| March 2025 | 62 | 62 | 64.5% | 0 |
| April 2025 | 60 | 60 | 76.7% | 0 |
| May 2025 | 55 | 55 | 80.0% | 0 |
| June 2025 | 56 | 56 | 58.9% | 0 |
| July 2025 | 57 | 56 | 82.1% | 1 |
| August 2025 | 62 | 62 | 82.3% | 0 |
| September 2025 | 60 | 60 | 76.7% | 0 |
| October 2025 | 60 | 60 | 88.3% | 0 |
| November 2025 | 60 | 57 | 93.0% | 3 |
| December 2025 | 50 | 48 | 75.0% | 2 |
| January 2026 | 31 | 30 | 80.0% | 1 |
| February 2026 | 28 | 28 | 96.4% | 0 |
| March 2026 | 55 | 53 | 73.6% | 2 |
| April 2026 | 60 | 60 | 81.7% | 0 |
| May 2026 | 62 | 62 | 71.0% | 0 |
| June 2026 | 60 | 60 | 71.7% | 0 |
| July 2026 | 62 | 60 | 66.7% | 2 |