DL566
DL566 (Delta Air Lines) is a multi-stop service on 8 routes, busiest St Louis to Atlanta. Of 869 departures recorded from October 2024 to July 2026, 87.7% left on time, according to the US BTS.
- On-time departures87.7%of 869 flights
- Average delay3.0 min
- July 202662▲ 106.7%vs July 2025
- Cancelled1.5%
- Legs flown under this number8
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 | 62 | 34 | ▼ 45.2% |
| February | 56 | 28 | ▼ 50.0% |
| March | 39 | 31 | ▼ 20.5% |
| April | 22 | 30 | ▲ 36.4% |
| May | 29 | 31 | ▲ 6.9% |
| June | 30 | 54 | ▲ 80.0% |
| July | 30 | 62 | ▲ 106.7% |
| August | 47 | – | – |
| September | 60 | – | – |
| October | 60 | – | in progress |
| November | 50 | – | – |
| December | 26 | – | – |
| Year to date (Jan–Jul) | 268 | 270 | ▲ 0.7% |
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 | 87.3% | 78.8% | ▼ 9.7% |
| February | 78.6% | 96.4% | ▲ 22.7% |
| March | 94.9% | 93.3% | ▼ 1.6% |
| April | 72.7% | 86.2% | ▲ 18.5% |
| May | 86.2% | 73.3% | ▼ 14.9% |
| June | 93.3% | 79.6% | ▼ 14.7% |
| July | 90.0% | 82.3% | ▼ 8.6% |
| August | 91.5% | – | – |
| September | 95.0% | – | – |
| October | 91.7% | – | in progress |
| November | 94.0% | – | – |
| December | 83.3% | – | – |
| Year-to-date average (Jan–Jul) | 86.1% | 84.3% | ▼ 2.2% |
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 | 7 | 1 | ▼ 85.7% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 1 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 7 | 4 | ▼ 42.9% |
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 98.5% 856
- Cancelled 1.5% 13
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL ATL St. Louis Lambert International Airport – Hartsfield Jackson Atlanta International Airport | 779 | 3.4 min | 86.0% | 308 |
| SMF DTW Sacramento International Airport – Detroit Metropolitan Wayne County Airport | 3,232 | 2.6 min | 91.0% | 167 |
| ATL STL Hartsfield Jackson Atlanta International Airport – St. Louis Lambert International Airport | 779 | 4.9 min | 83.0% | 151 |
| DTW SMF Detroit Metropolitan Wayne County Airport – Sacramento International Airport | 3,232 | -1.2 min | 96.2% | 105 |
| LAS JFK Harry Reid International Airport – John F. Kennedy International Airport | 3,609 | 8.6 min | 83.6% | 68 |
| TLH ATL Tallahassee International Airport – Hartsfield Jackson Atlanta International Airport | 360 | -2.8 min | 90.6% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 100.0% | 0 |
| November 2024 | 27 | 27 | 92.6% | 0 |
| December 2024 | 44 | 44 | 90.9% | 0 |
| January 2025 | 62 | 55 | 87.3% | 7 |
| February 2025 | 56 | 56 | 78.6% | 0 |
| March 2025 | 39 | 39 | 94.9% | 0 |
| April 2025 | 22 | 22 | 72.7% | 0 |
| May 2025 | 29 | 29 | 86.2% | 0 |
| June 2025 | 30 | 30 | 93.3% | 0 |
| July 2025 | 30 | 30 | 90.0% | 0 |
| August 2025 | 47 | 47 | 91.5% | 0 |
| September 2025 | 60 | 60 | 95.0% | 0 |
| October 2025 | 60 | 60 | 91.7% | 0 |
| November 2025 | 50 | 50 | 94.0% | 0 |
| December 2025 | 26 | 24 | 83.3% | 2 |
| January 2026 | 34 | 33 | 78.8% | 1 |
| February 2026 | 28 | 28 | 96.4% | 0 |
| March 2026 | 31 | 30 | 93.3% | 1 |
| April 2026 | 30 | 29 | 86.2% | 1 |
| May 2026 | 31 | 30 | 73.3% | 1 |
| June 2026 | 54 | 54 | 79.6% | 0 |
| July 2026 | 62 | 62 | 82.3% | 0 |