WN4181
WN4181 (Southwest Airlines) is a multi-stop service on 22 routes, busiest Sacramento to Houston. Of 391 departures recorded from October 2024 to July 2026, 72.1% left on time, according to the US BTS.
- On-time departures72.1%of 391 flights
- Average delay13.3 min
- July 202626▼ 23.5%vs July 2025
- Cancelled0.3%
- Legs flown under this number22
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 | 2 | 3 | ▲ 50.0% |
| February | 10 | 1 | ▼ 90.0% |
| March | 28 | 3 | ▼ 89.3% |
| April | 27 | 22 | ▼ 18.5% |
| May | 25 | 26 | ▲ 4.0% |
| June | 34 | 26 | ▼ 23.5% |
| July | 34 | 26 | ▼ 23.5% |
| August | 20 | – | – |
| September | 16 | – | – |
| October | 33 | – | in progress |
| November | 5 | – | – |
| December | 11 | – | – |
| Year to date (Jan–Jul) | 160 | 107 | ▼ 33.1% |
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 | 50.0% | 33.3% | ▼ 33.3% |
| February | 90.0% | 100.0% | ▲ 11.1% |
| March | 89.3% | 33.3% | ▼ 62.7% |
| April | 74.1% | 95.5% | ▲ 28.9% |
| May | 44.0% | 96.2% | ▲ 118.5% |
| June | 72.7% | 53.9% | ▼ 26.0% |
| July | 76.5% | 50.0% | ▼ 34.6% |
| August | 60.0% | – | – |
| September | 37.5% | – | – |
| October | 84.9% | – | in progress |
| November | 80.0% | – | – |
| December | 72.7% | – | – |
| Year-to-date average (Jan–Jul) | 70.9% | 66.0% | ▼ 6.9% |
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 | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 0 | ▼ 100.0% |
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 99.7% 390
- Cancelled 0.3% 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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SMF HOU Sacramento International Airport – William P. Hobby Airport | 2,610 | 13.2 min | 70.0% | 60 |
| SBA DEN Santa Barbara Municipal Airport – Denver International Airport | 1,471 | 0.2 min | 95.9% | 49 |
| SAN SFO San Diego International Airport – San Francisco International Airport | 719 | 37.2 min | 40.5% | 42 |
| OAK PHX Oakland San Francisco Bay Airport – Phoenix Sky Harbor International Airport | 1,039 | 1.4 min | 87.9% | 33 |
| TUL PHX Tulsa International Airport – Phoenix Sky Harbor International Airport | 1,501 | 1.8 min | 86.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 76.5% | 0 |
| November 2024 | 16 | 16 | 87.5% | 0 |
| December 2024 | 6 | 6 | 66.7% | 0 |
| January 2025 | 2 | 2 | 50.0% | 0 |
| February 2025 | 10 | 10 | 90.0% | 0 |
| March 2025 | 28 | 28 | 89.3% | 0 |
| April 2025 | 27 | 27 | 74.1% | 0 |
| May 2025 | 25 | 25 | 44.0% | 0 |
| June 2025 | 34 | 33 | 72.7% | 1 |
| July 2025 | 34 | 34 | 76.5% | 0 |
| August 2025 | 20 | 20 | 60.0% | 0 |
| September 2025 | 16 | 16 | 37.5% | 0 |
| October 2025 | 33 | 33 | 84.9% | 0 |
| November 2025 | 5 | 5 | 80.0% | 0 |
| December 2025 | 11 | 11 | 72.7% | 0 |
| January 2026 | 3 | 3 | 33.3% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 3 | 3 | 33.3% | 0 |
| April 2026 | 22 | 22 | 95.5% | 0 |
| May 2026 | 26 | 26 | 96.2% | 0 |
| June 2026 | 26 | 26 | 53.9% | 0 |
| July 2026 | 26 | 26 | 50.0% | 0 |