WN4312
WN4312 (Southwest Airlines) is a multi-stop service on 17 routes, busiest Austin to San Jose. Of 401 departures recorded from October 2024 to July 2026, 74.7% left on time, according to the US BTS.
- On-time departures74.7%of 401 flights
- Average delay14.1 min
- July 202627▲ 68.8%vs July 2025
- Cancelled0.5%
- Legs flown under this number17
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 | 11 | 4 | ▼ 63.6% |
| February | 15 | 11 | ▼ 26.7% |
| March | 28 | 28 | 0.0% |
| April | 7 | 27 | ▲ 285.7% |
| May | – | 25 | – |
| June | 16 | 26 | ▲ 62.5% |
| July | 16 | 27 | ▲ 68.8% |
| August | 27 | – | – |
| September | 25 | – | – |
| October | – | – | in progress |
| November | 24 | – | – |
| December | 26 | – | – |
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 | 81.8% | 75.0% | ▼ 8.3% |
| February | 93.3% | 100.0% | ▲ 7.1% |
| March | 70.4% | 96.4% | ▲ 37.0% |
| April | 57.1% | 63.0% | ▲ 10.2% |
| May | – | 60.0% | – |
| June | 68.8% | 73.1% | ▲ 6.3% |
| July | 81.3% | 51.9% | ▼ 36.2% |
| August | 70.4% | – | – |
| September | 68.0% | – | – |
| October | – | – | in progress |
| November | 87.0% | – | – |
| December | 65.4% | – | – |
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 | 0 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 1 | – | – |
| 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 99.5% 399
- Cancelled 0.5% 2
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| AUS SJC Austin Bergstrom International Airport – Mineta San Jose International Airport | 2,372 | 4.4 min | 87.5% | 80 |
| STL DEN St. Louis Lambert International Airport – Denver International Airport | 1,236 | 15.7 min | 62.0% | 50 |
| SLC SMF Salt Lake City International Airport – Sacramento International Airport | 854 | 18.9 min | 59.2% | 49 |
| TPA HOU Tampa International Airport – William P. Hobby Airport | 1,255 | 26.7 min | 62.5% | 40 |
| RDU STL Raleigh-Durham International Airport – St. Louis Lambert International Airport | 1,072 | 1.7 min | 93.9% | 33 |
| BWI RDU Baltimore/Washington International Thurgood Marshall Airport – Raleigh-Durham International Airport | 411 | 26.9 min | 65.6% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 6 | 6 | 66.7% | 0 |
| November 2024 | 24 | 24 | 91.7% | 0 |
| December 2024 | 28 | 28 | 82.1% | 0 |
| January 2025 | 11 | 11 | 81.8% | 0 |
| February 2025 | 15 | 15 | 93.3% | 0 |
| March 2025 | 28 | 27 | 70.4% | 1 |
| April 2025 | 7 | 7 | 57.1% | 0 |
| June 2025 | 16 | 16 | 68.8% | 0 |
| July 2025 | 16 | 16 | 81.3% | 0 |
| August 2025 | 27 | 27 | 70.4% | 0 |
| September 2025 | 25 | 25 | 68.0% | 0 |
| November 2025 | 24 | 23 | 87.0% | 1 |
| December 2025 | 26 | 26 | 65.4% | 0 |
| January 2026 | 4 | 4 | 75.0% | 0 |
| February 2026 | 11 | 11 | 100.0% | 0 |
| March 2026 | 28 | 28 | 96.4% | 0 |
| April 2026 | 27 | 27 | 63.0% | 0 |
| May 2026 | 25 | 25 | 60.0% | 0 |
| June 2026 | 26 | 26 | 73.1% | 0 |
| July 2026 | 27 | 27 | 51.9% | 0 |