WN4433
WN4433 (Southwest Airlines) is a multi-stop service on 20 routes, busiest St Louis to Las Vegas. Of 365 departures recorded from October 2024 to July 2026, 72.0% left on time, according to the US BTS.
- On-time departures72.0%of 365 flights
- Average delay14.3 min
- July 202635▲ 775.0%vs July 2025
- Cancelled1.1%
- Legs flown under this number20
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 | 22 | 32 | ▲ 45.5% |
| February | 16 | 25 | ▲ 56.3% |
| March | 33 | 28 | ▼ 15.2% |
| April | 11 | 5 | ▼ 54.5% |
| May | 5 | – | – |
| June | 5 | 30 | ▲ 500.0% |
| July | 4 | 35 | ▲ 775.0% |
| August | 1 | – | – |
| September | – | – | – |
| October | 18 | – | in progress |
| November | 37 | – | – |
| December | 45 | – | – |
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 | 90.9% | 65.6% | ▼ 27.8% |
| February | 87.5% | 68.0% | ▼ 22.3% |
| March | 66.7% | 78.6% | ▲ 17.8% |
| April | 66.7% | 40.0% | ▼ 40.0% |
| May | 40.0% | – | – |
| June | 80.0% | 72.4% | ▼ 9.5% |
| July | 100.0% | 41.2% | ▼ 58.8% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | 88.9% | – | in progress |
| November | 78.4% | – | – |
| December | 82.2% | – | – |
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 | 0 | 0 | – |
| April | 2 | 0 | ▼ 100.0% |
| May | 0 | – | – |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | – | – | – |
| 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 98.9% 361
- Cancelled 1.1% 4
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 |
|---|---|---|---|---|
| STL LAS St. Louis Lambert International Airport – Harry Reid International Airport | 2,202 | 14.6 min | 73.0% | 63 |
| DEN PDX Denver International Airport – Portland International Airport | 1,592 | 11.5 min | 69.1% | 55 |
| BWI ATL Baltimore/Washington International Thurgood Marshall Airport – Hartsfield Jackson Atlanta International Airport | 928 | 31.9 min | 59.6% | 49 |
| SEA SJC Seattle–Tacoma International Airport – Mineta San Jose International Airport | 1,122 | 2.7 min | 85.7% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 80.0% | 0 |
| November 2024 | 1 | 1 | 0.0% | 0 |
| December 2024 | 2 | 2 | 0.0% | 0 |
| January 2025 | 22 | 22 | 90.9% | 0 |
| February 2025 | 16 | 16 | 87.5% | 0 |
| March 2025 | 33 | 33 | 66.7% | 0 |
| April 2025 | 11 | 9 | 66.7% | 2 |
| May 2025 | 5 | 5 | 40.0% | 0 |
| June 2025 | 5 | 5 | 80.0% | 0 |
| July 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 1 | 1 | 100.0% | 0 |
| October 2025 | 18 | 18 | 88.9% | 0 |
| November 2025 | 37 | 37 | 78.4% | 0 |
| December 2025 | 45 | 45 | 82.2% | 0 |
| January 2026 | 32 | 32 | 65.6% | 0 |
| February 2026 | 25 | 25 | 68.0% | 0 |
| March 2026 | 28 | 28 | 78.6% | 0 |
| April 2026 | 5 | 5 | 40.0% | 0 |
| June 2026 | 30 | 29 | 72.4% | 1 |
| July 2026 | 35 | 34 | 41.2% | 1 |