WN4879
WN4879 (Southwest Airlines) is a multi-stop service on 8 routes, busiest Nashville to Phoenix. Of 243 departures recorded from October 2024 to July 2026, 88.4% left on time, according to the US BTS.
- On-time departures88.4%of 243 flights
- Average delay2.4 min
- July 202631
- Cancelled0.8%
- Legs flown under this number8
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods10 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 25 | 29 | ▲ 16.0% |
| February | 26 | 28 | ▲ 7.7% |
| March | 5 | 4 | ▼ 20.0% |
| April | – | – | – |
| May | – | – | – |
| June | – | 27 | – |
| July | – | 31 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 6 | – | – |
| December | 11 | – | – |
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 periods10 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 87.5% | 75.9% | ▼ 13.3% |
| February | 96.2% | 92.9% | ▼ 3.4% |
| March | 100.0% | 75.0% | ▼ 25.0% |
| April | – | – | – |
| May | – | – | – |
| June | – | 96.2% | – |
| July | – | 96.8% | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 83.3% | – | – |
| December | 63.6% | – | – |
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 periods10 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | – | – | – |
| May | – | – | – |
| June | – | 1 | – |
| July | – | 0 | – |
| August | – | – | – |
| September | – | – | – |
| 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 99.2% 241
- Cancelled 0.8% 2
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA PHX Nashville International Airport – Phoenix Sky Harbor International Airport | 2,326 | 4.2 min | 89.5% | 96 |
| SJC ONT Mineta San Jose International Airport – Ontario International Airport | 536 | -3.7 min | 96.5% | 58 |
| LAS LGB Harry Reid International Airport – Long Beach International Airport | 372 | 2.6 min | 84.5% | 58 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 90.0% | 0 |
| November 2024 | 23 | 23 | 87.0% | 0 |
| December 2024 | 18 | 18 | 83.3% | 0 |
| January 2025 | 25 | 24 | 87.5% | 1 |
| February 2025 | 26 | 26 | 96.2% | 0 |
| March 2025 | 5 | 5 | 100.0% | 0 |
| November 2025 | 6 | 6 | 83.3% | 0 |
| December 2025 | 11 | 11 | 63.6% | 0 |
| January 2026 | 29 | 29 | 75.9% | 0 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 4 | 4 | 75.0% | 0 |
| June 2026 | 27 | 26 | 96.2% | 1 |
| July 2026 | 31 | 31 | 96.8% | 0 |