WN4255
WN4255 (Southwest Airlines) is a multi-stop service on 24 routes, busiest Tampa to San Antonio. Of 406 departures recorded from October 2024 to July 2026, 64.4% left on time, according to the US BTS.
- On-time departures64.4%of 406 flights
- Average delay20.2 min
- July 202623
- Cancelled0.3%
- Legs flown under this number24
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 | 6 | 7 | ▲ 16.7% |
| February | 12 | 9 | ▼ 25.0% |
| March | 2 | 32 | ▲ 1,500.0% |
| April | – | 31 | – |
| May | – | 31 | – |
| June | – | 22 | – |
| July | – | 23 | – |
| August | 23 | – | – |
| September | 26 | – | – |
| October | 22 | – | in progress |
| November | 45 | – | – |
| December | 57 | – | – |
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 | 50.0% | 100.0% | ▲ 100.0% |
| February | 66.7% | 100.0% | ▲ 50.0% |
| March | 100.0% | 53.1% | ▼ 46.9% |
| April | – | 77.4% | – |
| May | – | 64.5% | – |
| June | – | 22.7% | – |
| July | – | 31.8% | – |
| August | 69.6% | – | – |
| September | 92.3% | – | – |
| October | 45.5% | – | in progress |
| November | 75.6% | – | – |
| December | 64.9% | – | – |
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 | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | – | 0 | – |
| May | – | 0 | – |
| June | – | 0 | – |
| July | – | 1 | – |
| 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 99.8% 405
- Cancelled 0.2% 1
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| TPA SAT Tampa International Airport – San Antonio International Airport | 1,562 | 21.9 min | 67.8% | 59 |
| SJC ONT Mineta San Jose International Airport – Ontario International Airport | 536 | 13.6 min | 69.0% | 58 |
| SEA HOU Seattle–Tacoma International Airport – William P. Hobby Airport | 3,046 | 12.2 min | 80.0% | 50 |
| AUS HOU Austin Bergstrom International Airport – William P. Hobby Airport | 238 | 33.3 min | 22.0% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 13 | 13 | 100.0% | 0 |
| November 2024 | 31 | 31 | 58.1% | 0 |
| December 2024 | 14 | 14 | 50.0% | 0 |
| January 2025 | 6 | 6 | 50.0% | 0 |
| February 2025 | 12 | 12 | 66.7% | 0 |
| March 2025 | 2 | 2 | 100.0% | 0 |
| August 2025 | 23 | 23 | 69.6% | 0 |
| September 2025 | 26 | 26 | 92.3% | 0 |
| October 2025 | 22 | 22 | 45.5% | 0 |
| November 2025 | 45 | 45 | 75.6% | 0 |
| December 2025 | 57 | 57 | 64.9% | 0 |
| January 2026 | 7 | 7 | 100.0% | 0 |
| February 2026 | 9 | 9 | 100.0% | 0 |
| March 2026 | 32 | 32 | 53.1% | 0 |
| April 2026 | 31 | 31 | 77.4% | 0 |
| May 2026 | 31 | 31 | 64.5% | 0 |
| June 2026 | 22 | 22 | 22.7% | 0 |
| July 2026 | 23 | 22 | 31.8% | 1 |