WN4205
WN4205 (Southwest Airlines) is a multi-stop service on 23 routes, busiest St Louis to Las Vegas. Of 406 departures recorded from October 2024 to July 2026, 66.4% left on time, according to the US BTS.
- On-time departures66.4%of 406 flights
- Average delay16.0 min
- July 202626▲ 62.5%vs July 2025
- Cancelled0.3%
- Legs flown under this number23
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 | 2 | 6 | ▲ 200.0% |
| February | 10 | 1 | ▼ 90.0% |
| March | 27 | 27 | 0.0% |
| April | 30 | 33 | ▲ 10.0% |
| May | 31 | 35 | ▲ 12.9% |
| June | 20 | 26 | ▲ 30.0% |
| July | 16 | 26 | ▲ 62.5% |
| August | 3 | – | – |
| September | – | – | – |
| October | 4 | – | in progress |
| November | 29 | – | – |
| December | 38 | – | – |
| Year to date (Jan–Jul) | 136 | 154 | ▲ 13.2% |
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 | 100.0% | 66.7% | ▼ 33.3% |
| February | 100.0% | 100.0% | 0.0% |
| March | 92.6% | 74.1% | ▼ 20.0% |
| April | 80.0% | 48.5% | ▼ 39.4% |
| May | 51.6% | 48.6% | ▼ 5.9% |
| June | 60.0% | 84.6% | ▲ 41.0% |
| July | 66.7% | 100.0% | ▲ 50.0% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | 75.0% | – | in progress |
| November | 65.5% | – | – |
| December | 31.6% | – | – |
| Year-to-date average (Jan–Jul) | 78.7% | 74.6% | ▼ 5.2% |
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 periods18 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 | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | – | – | – |
| 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 99.8% 405
- Cancelled 0.2% 1
Share of all recorded flights in the period, all legs. · Oct 12, 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 |
|---|---|---|---|---|
| STL LAS St. Louis Lambert International Airport – Harry Reid International Airport | 2,202 | 17.4 min | 53.5% | 58 |
| HOU BNA William P. Hobby Airport – Nashville International Airport | 1,078 | 17.8 min | 62.1% | 58 |
| SEA SMF Seattle–Tacoma International Airport – Sacramento International Airport | 975 | 35.5 min | 34.7% | 49 |
| SLC LAS Salt Lake City International Airport – Harry Reid International Airport | 592 | -2.1 min | 97.6% | 42 |
| HNL ITO Daniel K. Inouye International Airport – Hilo International Airport | 349 | -0.4 min | 93.8% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 94.7% | 0 |
| November 2024 | 17 | 17 | 52.9% | 0 |
| December 2024 | 6 | 6 | 0.0% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| February 2025 | 10 | 10 | 100.0% | 0 |
| March 2025 | 27 | 27 | 92.6% | 0 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 31 | 31 | 51.6% | 0 |
| June 2025 | 20 | 20 | 60.0% | 0 |
| July 2025 | 16 | 15 | 66.7% | 1 |
| August 2025 | 3 | 3 | 100.0% | 0 |
| October 2025 | 4 | 4 | 75.0% | 0 |
| November 2025 | 29 | 29 | 65.5% | 0 |
| December 2025 | 38 | 38 | 31.6% | 0 |
| January 2026 | 6 | 6 | 66.7% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 27 | 27 | 74.1% | 0 |
| April 2026 | 33 | 33 | 48.5% | 0 |
| May 2026 | 35 | 35 | 48.6% | 0 |
| June 2026 | 26 | 26 | 84.6% | 0 |
| July 2026 | 26 | 26 | 100.0% | 0 |