WN4538
WN4538 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Tampa to Nashville. Of 287 departures recorded from October 2024 to July 2026, 68.6% left on time, according to the US BTS.
- On-time departures68.6%of 287 flights
- Average delay16.4 min
- July 202616▼ 46.7%vs July 2025
- Cancelled0.0%
- Legs flown under this number20
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 4 | 5 | ▲ 25.0% |
| February | – | 8 | – |
| March | 25 | 5 | ▼ 80.0% |
| April | 7 | 28 | ▲ 300.0% |
| May | – | 35 | – |
| June | 26 | 18 | ▼ 30.8% |
| July | 30 | 16 | ▼ 46.7% |
| August | 20 | – | – |
| September | 17 | – | – |
| October | – | – | in progress |
| November | 3 | – | – |
| December | 3 | – | – |
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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 80.0% | ▼ 20.0% |
| February | – | 37.5% | – |
| March | 80.0% | 20.0% | ▼ 75.0% |
| April | 85.7% | 57.1% | ▼ 33.3% |
| May | – | 60.0% | – |
| June | 80.8% | 55.6% | ▼ 31.2% |
| July | 83.3% | 37.5% | ▼ 55.0% |
| August | 100.0% | – | – |
| September | 88.2% | – | – |
| October | – | – | in progress |
| November | 100.0% | – | – |
| December | 0.0% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | 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% 287
- Cancelled 0.0% 0
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| TPA BNA Tampa International Airport – Nashville International Airport | 987 | 27.6 min | 54.4% | 57 |
| SMF SLC Sacramento International Airport – Salt Lake City International Airport | 854 | 6.5 min | 88.2% | 51 |
| LAS MCO Harry Reid International Airport – Orlando International Airport | 3,276 | 9.3 min | 81.3% | 32 |
| BUR DEN Hollywood Burbank/Bob Hope Airport – Denver International Airport | 1,366 | 1.6 min | 93.8% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 84.2% | 0 |
| November 2024 | 10 | 10 | 50.0% | 0 |
| December 2024 | 8 | 8 | 12.5% | 0 |
| January 2025 | 4 | 4 | 100.0% | 0 |
| March 2025 | 25 | 25 | 80.0% | 0 |
| April 2025 | 7 | 7 | 85.7% | 0 |
| June 2025 | 26 | 26 | 80.8% | 0 |
| July 2025 | 30 | 30 | 83.3% | 0 |
| August 2025 | 20 | 20 | 100.0% | 0 |
| September 2025 | 17 | 17 | 88.2% | 0 |
| November 2025 | 3 | 3 | 100.0% | 0 |
| December 2025 | 3 | 3 | 0.0% | 0 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| February 2026 | 8 | 8 | 37.5% | 0 |
| March 2026 | 5 | 5 | 20.0% | 0 |
| April 2026 | 28 | 28 | 57.1% | 0 |
| May 2026 | 35 | 35 | 60.0% | 0 |
| June 2026 | 18 | 18 | 55.6% | 0 |
| July 2026 | 16 | 16 | 37.5% | 0 |