WN4556
WN4556 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Kansas City to Phoenix. Of 330 departures recorded from October 2024 to July 2026, 75.2% left on time, according to the US BTS.
- On-time departures75.2%of 330 flights
- Average delay13.4 min
- July 202614▲ 0.0%vs July 2025
- Cancelled0.0%
- Legs flown under this number18
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 | 31 | 6 | ▼ 80.6% |
| February | 30 | – | – |
| March | 13 | 29 | ▲ 123.1% |
| April | 5 | 6 | ▲ 20.0% |
| May | 4 | – | – |
| June | 13 | 11 | ▼ 15.4% |
| July | 14 | 14 | 0.0% |
| August | 2 | – | – |
| September | – | – | – |
| October | 17 | – | in progress |
| November | 35 | – | – |
| December | 45 | – | – |
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 | 80.7% | 100.0% | ▲ 24.0% |
| February | 76.7% | – | – |
| March | 76.9% | 96.6% | ▲ 25.5% |
| April | 100.0% | 100.0% | 0.0% |
| May | 75.0% | – | – |
| June | 84.6% | 54.6% | ▼ 35.5% |
| July | 92.9% | 28.6% | ▼ 69.2% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | 76.5% | – | in progress |
| November | 71.4% | – | – |
| December | 51.1% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | – | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| 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 100.0% 330
- Cancelled 0.0% 0
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| MCI PHX Kansas City International Airport – Phoenix Sky Harbor International Airport | 1,677 | 4.8 min | 88.7% | 71 |
| DCA BNA Ronald Reagan Washington National Airport – Nashville International Airport | 903 | 18.9 min | 70.9% | 55 |
| STL TPA St. Louis Lambert International Airport – Tampa International Airport | 1,400 | -4.6 min | 97.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 4 | 4 | 100.0% | 0 |
| November 2024 | 25 | 25 | 80.0% | 0 |
| December 2024 | 26 | 26 | 80.8% | 0 |
| January 2025 | 31 | 31 | 80.7% | 0 |
| February 2025 | 30 | 30 | 76.7% | 0 |
| March 2025 | 13 | 13 | 76.9% | 0 |
| April 2025 | 5 | 5 | 100.0% | 0 |
| May 2025 | 4 | 4 | 75.0% | 0 |
| June 2025 | 13 | 13 | 84.6% | 0 |
| July 2025 | 14 | 14 | 92.9% | 0 |
| August 2025 | 2 | 2 | 100.0% | 0 |
| October 2025 | 17 | 17 | 76.5% | 0 |
| November 2025 | 35 | 35 | 71.4% | 0 |
| December 2025 | 45 | 45 | 51.1% | 0 |
| January 2026 | 6 | 6 | 100.0% | 0 |
| March 2026 | 29 | 29 | 96.6% | 0 |
| April 2026 | 6 | 6 | 100.0% | 0 |
| June 2026 | 11 | 11 | 54.6% | 0 |
| July 2026 | 14 | 14 | 28.6% | 0 |