WN4878
WN4878 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Denver to Nashville. Of 211 departures recorded from October 2024 to July 2026, 73.1% left on time, according to the US BTS.
- On-time departures73.1%of 211 flights
- Average delay13.1 min
- July 202617
- Cancelled1.4%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods14 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 29 | 5 | ▼ 82.8% |
| February | 28 | 7 | ▼ 75.0% |
| March | 9 | 1 | ▼ 88.9% |
| April | 4 | – | – |
| May | 15 | – | – |
| June | 2 | 4 | ▲ 100.0% |
| July | – | 17 | – |
| August | – | – | – |
| September | – | – | – |
| October | 1 | – | in progress |
| November | 18 | – | – |
| December | 17 | – | – |
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 periods14 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 78.6% | 60.0% | ▼ 23.6% |
| February | 70.4% | 71.4% | ▲ 1.5% |
| March | 88.9% | 0.0% | ▼ 100.0% |
| April | 75.0% | – | – |
| May | 100.0% | – | – |
| June | 100.0% | 25.0% | ▼ 75.0% |
| July | – | 41.2% | – |
| August | – | – | – |
| September | – | – | – |
| October | 100.0% | – | in progress |
| November | 66.7% | – | – |
| December | 47.1% | – | – |
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 periods14 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | – | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | – | – | – |
| 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 98.6% 208
- Cancelled 1.4% 3
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN BNA Denver International Airport – Nashville International Airport | 1,628 | 8.4 min | 82.3% | 99 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 11 | 11 | 81.8% | 0 |
| November 2024 | 21 | 20 | 95.0% | 1 |
| December 2024 | 22 | 22 | 81.8% | 0 |
| January 2025 | 29 | 28 | 78.6% | 1 |
| February 2025 | 28 | 27 | 70.4% | 1 |
| March 2025 | 9 | 9 | 88.9% | 0 |
| April 2025 | 4 | 4 | 75.0% | 0 |
| May 2025 | 15 | 15 | 100.0% | 0 |
| June 2025 | 2 | 2 | 100.0% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 18 | 18 | 66.7% | 0 |
| December 2025 | 17 | 17 | 47.1% | 0 |
| January 2026 | 5 | 5 | 60.0% | 0 |
| February 2026 | 7 | 7 | 71.4% | 0 |
| March 2026 | 1 | 1 | 0.0% | 0 |
| June 2026 | 4 | 4 | 25.0% | 0 |
| July 2026 | 17 | 17 | 41.2% | 0 |