WN4815
WN4815 (Southwest Airlines) is a multi-stop service on 11 routes, busiest Nashville to Detroit. Of 163 departures recorded from October 2024 to July 2026, 66.9% left on time, according to the US BTS.
- On-time departures66.9%of 163 flights
- Average delay16.0 min
- July 202627
- Cancelled0.0%
- Legs flown under this number11
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods11 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 6 | 2 | ▼ 66.7% |
| February | 10 | 23 | ▲ 130.0% |
| March | 1 | 2 | ▲ 100.0% |
| April | – | – | – |
| May | – | 3 | – |
| June | – | 23 | – |
| July | – | 27 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 2 | – | – |
| December | 9 | – | – |
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 periods11 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 50.0% | 100.0% | ▲ 100.0% |
| February | 80.0% | 95.7% | ▲ 19.6% |
| March | 100.0% | 100.0% | 0.0% |
| April | – | – | – |
| May | – | 33.3% | – |
| June | – | 47.8% | – |
| July | – | 44.4% | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 100.0% | – | – |
| December | 44.4% | – | – |
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 periods11 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | – | – | – |
| May | – | 0 | – |
| June | – | 0 | – |
| 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 100.0% 163
- 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 DTW Nashville International Airport – Detroit Metropolitan Wayne County Airport | 735 | 26.0 min | 46.0% | 50 |
| MDW BOS Chicago Midway International Airport – Boston Logan International Airport | 1,381 | 14.4 min | 78.4% | 37 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 40.0% | 0 |
| November 2024 | 25 | 25 | 76.0% | 0 |
| December 2024 | 20 | 20 | 90.0% | 0 |
| January 2025 | 6 | 6 | 50.0% | 0 |
| February 2025 | 10 | 10 | 80.0% | 0 |
| March 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 2 | 2 | 100.0% | 0 |
| December 2025 | 9 | 9 | 44.4% | 0 |
| January 2026 | 2 | 2 | 100.0% | 0 |
| February 2026 | 23 | 23 | 95.7% | 0 |
| March 2026 | 2 | 2 | 100.0% | 0 |
| May 2026 | 3 | 3 | 33.3% | 0 |
| June 2026 | 23 | 23 | 47.8% | 0 |
| July 2026 | 27 | 27 | 44.4% | 0 |