WN4056
WN4056 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Phoenix to Milwaukee. Of 255 departures recorded from October 2024 to July 2026, 75.5% left on time, according to the US BTS.
- On-time departures75.5%of 255 flights
- Average delay16.3 min
- July 202623
- Cancelled0.8%
- 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 periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 5 | 12 | ▲ 140.0% |
| February | 2 | 20 | ▲ 900.0% |
| March | 20 | 29 | ▲ 45.0% |
| April | 5 | 6 | ▲ 20.0% |
| May | 1 | – | – |
| June | – | 19 | – |
| July | – | 23 | – |
| August | 30 | – | – |
| September | 34 | – | – |
| October | 5 | – | in progress |
| November | 4 | – | – |
| 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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 60.0% | 83.3% | ▲ 38.9% |
| February | 100.0% | 75.0% | ▼ 25.0% |
| March | 85.0% | 78.6% | ▼ 7.6% |
| April | 60.0% | 100.0% | ▲ 66.7% |
| May | 100.0% | – | – |
| June | – | 52.6% | – |
| July | – | 34.8% | – |
| August | 83.3% | – | – |
| September | 97.1% | – | – |
| October | 40.0% | – | in progress |
| November | 75.0% | – | – |
| December | 81.8% | – | – |
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 | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 1 | – |
| May | 0 | – | – |
| June | – | 0 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.2% 253
- Cancelled 0.8% 2
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 |
|---|---|---|---|---|
| PHX MKE Phoenix Sky Harbor International Airport – General Mitchell International Airport | 2,346 | 3.6 min | 92.0% | 50 |
| TUL LAS Tulsa International Airport – Harry Reid International Airport | 1,727 | 47.0 min | 42.9% | 42 |
| OAK BUR Oakland San Francisco Bay Airport – Hollywood Burbank/Bob Hope Airport | 523 | 14.4 min | 80.7% | 33 |
| SMF DEN Sacramento International Airport – Denver International Airport | 1,460 | 10.3 min | 76.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 80.0% | 0 |
| November 2024 | 7 | 7 | 85.7% | 0 |
| December 2024 | 12 | 12 | 75.0% | 0 |
| January 2025 | 5 | 5 | 60.0% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 20 | 20 | 85.0% | 0 |
| April 2025 | 5 | 5 | 60.0% | 0 |
| May 2025 | 1 | 1 | 100.0% | 0 |
| August 2025 | 30 | 30 | 83.3% | 0 |
| September 2025 | 34 | 34 | 97.1% | 0 |
| October 2025 | 5 | 5 | 40.0% | 0 |
| November 2025 | 4 | 4 | 75.0% | 0 |
| December 2025 | 11 | 11 | 81.8% | 0 |
| January 2026 | 12 | 12 | 83.3% | 0 |
| February 2026 | 20 | 20 | 75.0% | 0 |
| March 2026 | 29 | 28 | 78.6% | 1 |
| April 2026 | 6 | 5 | 100.0% | 1 |
| June 2026 | 19 | 19 | 52.6% | 0 |
| July 2026 | 23 | 23 | 34.8% | 0 |