WN4581
WN4581 (Southwest Airlines) is a multi-stop service on 14 routes, busiest Detroit to Nashville. Of 207 departures recorded from October 2024 to July 2026, 74.8% left on time, according to the US BTS.
- On-time departures74.8%of 207 flights
- Average delay12.2 min
- July 202630▲ 87.5%vs July 2025
- Cancelled0.5%
- Legs flown under this number14
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods13 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 2 | ▲ 100.0% |
| February | – | – | – |
| March | 4 | – | – |
| April | 1 | – | – |
| May | – | 1 | – |
| June | 16 | 27 | ▲ 68.8% |
| July | 16 | 30 | ▲ 87.5% |
| August | 3 | – | – |
| September | – | – | – |
| October | 46 | – | in progress |
| November | 17 | – | – |
| December | 8 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods13 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 0.0% | ▼ 100.0% |
| February | – | – | – |
| March | 50.0% | – | – |
| April | 100.0% | – | – |
| May | – | 0.0% | – |
| June | 50.0% | 88.9% | ▲ 77.8% |
| July | 50.0% | 86.2% | ▲ 72.4% |
| August | 66.7% | – | – |
| September | – | – | – |
| October | 73.9% | – | in progress |
| November | 64.7% | – | – |
| December | 75.0% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods13 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | – | – |
| March | 0 | – | – |
| April | 0 | – | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 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% 206
- Cancelled 0.5% 1
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DTW BNA Detroit Metropolitan Wayne County Airport – Nashville International Airport | 735 | 5.6 min | 87.5% | 57 |
| SMF SNA Sacramento International Airport – John Wayne Orange County International Airport | 650 | 22.4 min | 51.4% | 35 |
| TPA STL Tampa International Airport – St. Louis Lambert International Airport | 1,400 | 6.7 min | 87.1% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 87.5% | 0 |
| November 2024 | 15 | 15 | 93.3% | 0 |
| December 2024 | 4 | 4 | 100.0% | 0 |
| January 2025 | 1 | 1 | 100.0% | 0 |
| March 2025 | 4 | 4 | 50.0% | 0 |
| April 2025 | 1 | 1 | 100.0% | 0 |
| June 2025 | 16 | 16 | 50.0% | 0 |
| July 2025 | 16 | 16 | 50.0% | 0 |
| August 2025 | 3 | 3 | 66.7% | 0 |
| October 2025 | 46 | 46 | 73.9% | 0 |
| November 2025 | 17 | 17 | 64.7% | 0 |
| December 2025 | 8 | 8 | 75.0% | 0 |
| January 2026 | 2 | 2 | 0.0% | 0 |
| May 2026 | 1 | 1 | 0.0% | 0 |
| June 2026 | 27 | 27 | 88.9% | 0 |
| July 2026 | 30 | 29 | 86.2% | 1 |