WN4437
WN4437 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Nashville to Austin. Of 316 departures recorded from October 2024 to July 2026, 77.0% left on time, according to the US BTS.
- On-time departures77.0%of 316 flights
- Average delay11.8 min
- July 202622▲ 450.0%vs July 2025
- Cancelled2.5%
- 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 | 7 | 27 | ▲ 285.7% |
| February | 14 | 18 | ▲ 28.6% |
| March | 3 | 30 | ▲ 900.0% |
| April | – | 33 | – |
| May | – | 36 | – |
| June | 5 | 23 | ▲ 360.0% |
| July | 4 | 22 | ▲ 450.0% |
| August | 1 | – | – |
| September | – | – | – |
| October | 21 | – | in progress |
| November | 6 | – | – |
| December | 7 | – | – |
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 | 66.7% | 80.8% | ▲ 21.1% |
| February | 78.6% | 77.8% | ▼ 1.0% |
| March | 0.0% | 73.3% | – |
| April | – | 90.9% | – |
| May | – | 91.7% | – |
| June | 60.0% | 50.0% | ▼ 16.7% |
| July | 75.0% | 42.9% | ▼ 42.9% |
| August | 0.0% | – | – |
| September | – | – | – |
| October | 95.0% | – | in progress |
| November | 80.0% | – | – |
| December | 20.0% | – | – |
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 | 1 | 1 | 0.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | – | 0 | – |
| May | – | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 1 | – | in progress |
| November | 1 | – | – |
| December | 2 | – | – |
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 97.5% 308
- Cancelled 2.5% 8
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 |
|---|---|---|---|---|
| BNA AUS Nashville International Airport – Austin Bergstrom International Airport | 1,215 | -0.6 min | 94.8% | 58 |
| BNA DTW Nashville International Airport – Detroit Metropolitan Wayne County Airport | 735 | 2.8 min | 80.4% | 47 |
| BWI GSP Baltimore/Washington International Thurgood Marshall Airport – Greenville-Spartanburg International Airport | 685 | 52.6 min | 42.5% | 42 |
| SJC BUR Mineta San Jose International Airport – Hollywood Burbank/Bob Hope Airport | 477 | 13.1 min | 72.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 22 | 22 | 90.9% | 0 |
| December 2024 | 17 | 17 | 94.1% | 0 |
| January 2025 | 7 | 6 | 66.7% | 1 |
| February 2025 | 14 | 14 | 78.6% | 0 |
| March 2025 | 3 | 3 | 0.0% | 0 |
| June 2025 | 5 | 5 | 60.0% | 0 |
| July 2025 | 4 | 4 | 75.0% | 0 |
| August 2025 | 1 | 1 | 0.0% | 0 |
| October 2025 | 21 | 20 | 95.0% | 1 |
| November 2025 | 6 | 5 | 80.0% | 1 |
| December 2025 | 7 | 5 | 20.0% | 2 |
| January 2026 | 27 | 26 | 80.8% | 1 |
| February 2026 | 18 | 18 | 77.8% | 0 |
| March 2026 | 30 | 30 | 73.3% | 0 |
| April 2026 | 33 | 33 | 90.9% | 0 |
| May 2026 | 36 | 36 | 91.7% | 0 |
| June 2026 | 23 | 22 | 50.0% | 1 |
| July 2026 | 22 | 21 | 42.9% | 1 |