WN4609
WN4609 (Southwest Airlines) is a multi-stop service on 14 routes, busiest Nashville to Milwaukee. Of 411 departures recorded from October 2024 to July 2026, 73.8% left on time, according to the US BTS.
- On-time departures73.8%of 411 flights
- Average delay14.1 min
- July 202626▼ 13.3%vs July 2025
- Cancelled1.7%
- Legs flown under this number14
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 30 | 30 | 0.0% |
| February | 18 | 28 | ▲ 55.6% |
| March | 3 | 18 | ▲ 500.0% |
| April | – | 15 | – |
| May | – | 13 | – |
| June | 26 | 25 | ▼ 3.8% |
| July | 30 | 26 | ▼ 13.3% |
| August | 4 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 38 | – | – |
| December | 26 | – | – |
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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 79.3% | 85.7% | ▲ 8.1% |
| February | 88.9% | 92.3% | ▲ 3.8% |
| March | 100.0% | 88.2% | ▼ 11.8% |
| April | – | 80.0% | – |
| May | – | 76.9% | – |
| June | 57.7% | 88.0% | ▲ 52.5% |
| July | 46.7% | 80.0% | ▲ 71.4% |
| August | 75.0% | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 42.1% | – | – |
| December | 53.9% | – | – |
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 periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 2 | ▲ 100.0% |
| February | 0 | 2 | – |
| March | 0 | 1 | – |
| April | – | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| 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 98.3% 404
- Cancelled 1.7% 7
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA MKE Nashville International Airport – General Mitchell International Airport | 766 | 1.9 min | 89.0% | 73 |
| STL ATL St. Louis Lambert International Airport – Hartsfield Jackson Atlanta International Airport | 779 | 33.7 min | 53.3% | 60 |
| SAV BWI Savannah Hilton Head International Airport – Baltimore/Washington International Thurgood Marshall Airport | 884 | 2.1 min | 92.6% | 58 |
| RSW BWI Southwest Florida International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,483 | 10.7 min | 83.3% | 49 |
| AUS HRL Austin Bergstrom International Airport – Valley International Airport | 441 | 33.1 min | 42.2% | 45 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 26 | 26 | 69.2% | 0 |
| November 2024 | 27 | 27 | 92.6% | 0 |
| December 2024 | 28 | 28 | 85.7% | 0 |
| January 2025 | 30 | 29 | 79.3% | 1 |
| February 2025 | 18 | 18 | 88.9% | 0 |
| March 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 26 | 26 | 57.7% | 0 |
| July 2025 | 30 | 30 | 46.7% | 0 |
| August 2025 | 4 | 4 | 75.0% | 0 |
| November 2025 | 38 | 38 | 42.1% | 0 |
| December 2025 | 26 | 26 | 53.9% | 0 |
| January 2026 | 30 | 28 | 85.7% | 2 |
| February 2026 | 28 | 26 | 92.3% | 2 |
| March 2026 | 18 | 17 | 88.2% | 1 |
| April 2026 | 15 | 15 | 80.0% | 0 |
| May 2026 | 13 | 13 | 76.9% | 0 |
| June 2026 | 25 | 25 | 88.0% | 0 |
| July 2026 | 26 | 25 | 80.0% | 1 |