WN4456
WN4456 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Kansas City to Houston. Of 227 departures recorded from October 2024 to July 2026, 76.6% left on time, according to the US BTS.
- On-time departures76.6%of 227 flights
- Average delay10.8 min
- July 202631▲ 675.0%vs July 2025
- Cancelled0.4%
- 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 periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 6 | ▲ 500.0% |
| February | – | 1 | – |
| March | 16 | 8 | ▼ 50.0% |
| April | 4 | 2 | ▼ 50.0% |
| May | – | 2 | – |
| June | 4 | 26 | ▲ 550.0% |
| July | 4 | 31 | ▲ 675.0% |
| August | 27 | – | – |
| September | 30 | – | – |
| October | 13 | – | in progress |
| November | 9 | – | – |
| December | 20 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 0.0% | 66.7% | – |
| February | – | 100.0% | – |
| March | 56.3% | 87.5% | ▲ 55.6% |
| April | 25.0% | 100.0% | ▲ 300.0% |
| May | – | 100.0% | – |
| June | 25.0% | 88.5% | ▲ 253.8% |
| July | 50.0% | 96.8% | ▲ 93.5% |
| August | 92.6% | – | – |
| September | 90.0% | – | – |
| October | 76.9% | – | in progress |
| November | 88.9% | – | – |
| December | 68.4% | – | – |
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 periods17 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 | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
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 99.6% 226
- Cancelled 0.4% 1
Share of all recorded flights in the period, all legs. · Oct 15, 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 |
|---|---|---|---|---|
| MCI HOU Kansas City International Airport – William P. Hobby Airport | 1,075 | -0.5 min | 93.0% | 57 |
| HOU AUS William P. Hobby Airport – Austin Bergstrom International Airport | 238 | -3.0 min | 95.9% | 49 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 6 | 6 | 66.7% | 0 |
| November 2024 | 13 | 13 | 15.4% | 0 |
| December 2024 | 4 | 4 | 50.0% | 0 |
| January 2025 | 1 | 1 | 0.0% | 0 |
| March 2025 | 16 | 16 | 56.3% | 0 |
| April 2025 | 4 | 4 | 25.0% | 0 |
| June 2025 | 4 | 4 | 25.0% | 0 |
| July 2025 | 4 | 4 | 50.0% | 0 |
| August 2025 | 27 | 27 | 92.6% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 13 | 13 | 76.9% | 0 |
| November 2025 | 9 | 9 | 88.9% | 0 |
| December 2025 | 20 | 19 | 68.4% | 1 |
| January 2026 | 6 | 6 | 66.7% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 8 | 8 | 87.5% | 0 |
| April 2026 | 2 | 2 | 100.0% | 0 |
| May 2026 | 2 | 2 | 100.0% | 0 |
| June 2026 | 26 | 26 | 88.5% | 0 |
| July 2026 | 31 | 31 | 96.8% | 0 |