WN4559
WN4559 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Nashville to Birmingham. Of 256 departures recorded from October 2024 to July 2026, 62.5% left on time, according to the US BTS.
- On-time departures62.5%of 256 flights
- Average delay18.2 min
- July 202630▲ 0.0%vs July 2025
- Cancelled0.0%
- Legs flown under this number18
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 4 | ▲ 100.0% |
| February | 8 | 10 | ▲ 25.0% |
| March | 5 | 2 | ▼ 60.0% |
| April | 1 | – | – |
| May | – | – | – |
| June | 26 | 27 | ▲ 3.8% |
| July | 30 | 30 | 0.0% |
| August | 4 | – | – |
| September | – | – | – |
| October | 4 | – | in progress |
| November | 36 | – | – |
| December | 15 | – | – |
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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 100.0% | 0.0% |
| February | 100.0% | 80.0% | ▼ 20.0% |
| March | 80.0% | 100.0% | ▲ 25.0% |
| April | 100.0% | – | – |
| May | – | – | – |
| June | 61.5% | 33.3% | ▼ 45.8% |
| July | 63.3% | 40.0% | ▼ 36.8% |
| August | 25.0% | – | – |
| September | – | – | – |
| October | 25.0% | – | in progress |
| November | 77.8% | – | – |
| December | 60.0% | – | – |
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 periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | – | – |
| May | – | – | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| 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 100.0% 256
- Cancelled 0.0% 0
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 |
|---|---|---|---|---|
| BNA BHM Nashville International Airport – Birmingham-Shuttlesworth International Airport | 285 | 35.2 min | 36.8% | 57 |
| SMF LAS Sacramento International Airport – Harry Reid International Airport | 639 | 23.3 min | 59.5% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 64.7% | 0 |
| November 2024 | 27 | 27 | 70.4% | 0 |
| December 2024 | 8 | 8 | 75.0% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| February 2025 | 8 | 8 | 100.0% | 0 |
| March 2025 | 5 | 5 | 80.0% | 0 |
| April 2025 | 1 | 1 | 100.0% | 0 |
| June 2025 | 26 | 26 | 61.5% | 0 |
| July 2025 | 30 | 30 | 63.3% | 0 |
| August 2025 | 4 | 4 | 25.0% | 0 |
| October 2025 | 4 | 4 | 25.0% | 0 |
| November 2025 | 36 | 36 | 77.8% | 0 |
| December 2025 | 15 | 15 | 60.0% | 0 |
| January 2026 | 4 | 4 | 100.0% | 0 |
| February 2026 | 10 | 10 | 80.0% | 0 |
| March 2026 | 2 | 2 | 100.0% | 0 |
| June 2026 | 27 | 27 | 33.3% | 0 |
| July 2026 | 30 | 30 | 40.0% | 0 |