WN4451
WN4451 (Southwest Airlines) is a multi-stop service on 22 routes, busiest Houston to San Antonio. Of 357 departures recorded from October 2024 to July 2026, 68.7% left on time, according to the US BTS.
- On-time departures68.7%of 357 flights
- Average delay15.4 min
- July 202631▲ 19.2%vs July 2025
- Cancelled0.6%
- Legs flown under this number22
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 4 | 8 | ▲ 100.0% |
| February | – | 15 | – |
| March | 4 | 25 | ▲ 525.0% |
| April | 13 | 37 | ▲ 184.6% |
| May | 18 | 39 | ▲ 116.7% |
| June | 24 | 32 | ▲ 33.3% |
| July | 26 | 31 | ▲ 19.2% |
| August | 6 | – | – |
| September | 4 | – | – |
| October | 30 | – | in progress |
| November | 10 | – | – |
| December | 7 | – | – |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 75.0% | 85.7% | ▲ 14.3% |
| February | – | 100.0% | – |
| March | 100.0% | 68.0% | ▼ 32.0% |
| April | 92.3% | 83.8% | ▼ 9.2% |
| May | 94.4% | 71.8% | ▼ 24.0% |
| June | 62.5% | 45.2% | ▼ 27.7% |
| July | 69.2% | 48.4% | ▼ 30.1% |
| August | 16.7% | – | – |
| September | 50.0% | – | – |
| October | 66.7% | – | in progress |
| November | 70.0% | – | – |
| December | 28.6% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | – | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 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 99.4% 355
- Cancelled 0.6% 2
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| HOU SAT William P. Hobby Airport – San Antonio International Airport | 309 | 28.1 min | 45.6% | 58 |
| SDF HOU Louisville Muhammad Ali International Airport – William P. Hobby Airport | 1,292 | 19.5 min | 62.8% | 51 |
| STL DCA St. Louis Lambert International Airport – Ronald Reagan Washington National Airport | 1,154 | 13.5 min | 64.0% | 50 |
| LAS SJC Harry Reid International Airport – Mineta San Jose International Airport | 620 | 1.5 min | 90.6% | 32 |
| SFO BWI San Francisco International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,944 | 18.8 min | 67.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 100.0% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| December 2024 | 13 | 13 | 46.2% | 0 |
| January 2025 | 4 | 4 | 75.0% | 0 |
| March 2025 | 4 | 4 | 100.0% | 0 |
| April 2025 | 13 | 13 | 92.3% | 0 |
| May 2025 | 18 | 18 | 94.4% | 0 |
| June 2025 | 24 | 24 | 62.5% | 0 |
| July 2025 | 26 | 26 | 69.2% | 0 |
| August 2025 | 6 | 6 | 16.7% | 0 |
| September 2025 | 4 | 4 | 50.0% | 0 |
| October 2025 | 30 | 30 | 66.7% | 0 |
| November 2025 | 10 | 10 | 70.0% | 0 |
| December 2025 | 7 | 7 | 28.6% | 0 |
| January 2026 | 8 | 7 | 85.7% | 1 |
| February 2026 | 15 | 15 | 100.0% | 0 |
| March 2026 | 25 | 25 | 68.0% | 0 |
| April 2026 | 37 | 37 | 83.8% | 0 |
| May 2026 | 39 | 39 | 71.8% | 0 |
| June 2026 | 32 | 31 | 45.2% | 1 |
| July 2026 | 31 | 31 | 48.4% | 0 |