WN4423
WN4423 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Austin to El Paso. Of 285 departures recorded from October 2024 to July 2026, 70.3% left on time, according to the US BTS.
- On-time departures70.3%of 285 flights
- Average delay17.8 min
- July 202618▲ 12.5%vs July 2025
- Cancelled0.7%
- Legs flown under this number18
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 7 | 1 | ▼ 85.7% |
| February | 4 | 1 | ▼ 75.0% |
| March | 27 | 16 | ▼ 40.7% |
| April | 27 | 7 | ▼ 74.1% |
| May | 25 | 5 | ▼ 80.0% |
| June | 20 | 16 | ▼ 20.0% |
| July | 16 | 18 | ▲ 12.5% |
| August | 14 | – | – |
| September | 13 | – | – |
| October | 22 | – | in progress |
| November | 4 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 126 | 64 | ▼ 49.2% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 57.1% | 0.0% | ▼ 100.0% |
| February | 50.0% | 100.0% | ▲ 100.0% |
| March | 80.8% | 81.3% | ▲ 0.6% |
| April | 81.5% | 57.1% | ▼ 29.9% |
| May | 68.0% | 0.0% | ▼ 100.0% |
| June | 65.0% | 68.8% | ▲ 5.8% |
| July | 37.5% | 72.2% | ▲ 92.6% |
| August | 50.0% | – | – |
| September | 69.2% | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | 100.0% | – | – |
| Year-to-date average (Jan–Jul) | 62.8% | 54.2% | ▼ 13.8% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 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 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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 99.3% 283
- Cancelled 0.7% 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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| AUS ELP Austin Bergstrom International Airport – El Paso International Airport | 849 | 17.4 min | 75.5% | 49 |
| SAN TUS San Diego International Airport – Tucson International Airport | 591 | 21.6 min | 51.4% | 35 |
| AUS SMF Austin Bergstrom International Airport – Sacramento International Airport | 2,380 | 13.9 min | 81.3% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 100.0% | 0 |
| November 2024 | 17 | 17 | 70.6% | 0 |
| December 2024 | 14 | 14 | 50.0% | 0 |
| January 2025 | 7 | 7 | 57.1% | 0 |
| February 2025 | 4 | 4 | 50.0% | 0 |
| March 2025 | 27 | 26 | 80.8% | 1 |
| April 2025 | 27 | 27 | 81.5% | 0 |
| May 2025 | 25 | 25 | 68.0% | 0 |
| June 2025 | 20 | 20 | 65.0% | 0 |
| July 2025 | 16 | 16 | 37.5% | 0 |
| August 2025 | 14 | 14 | 50.0% | 0 |
| September 2025 | 13 | 13 | 69.2% | 0 |
| October 2025 | 22 | 22 | 100.0% | 0 |
| November 2025 | 4 | 4 | 100.0% | 0 |
| December 2025 | 2 | 2 | 100.0% | 0 |
| January 2026 | 1 | 1 | 0.0% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 16 | 16 | 81.3% | 0 |
| April 2026 | 7 | 7 | 57.1% | 0 |
| May 2026 | 5 | 4 | 0.0% | 1 |
| June 2026 | 16 | 16 | 68.8% | 0 |
| July 2026 | 18 | 18 | 72.2% | 0 |