WN4536
WN4536 (Southwest Airlines) is a multi-stop service on 22 routes, busiest Las Vegas to Los Angeles. Of 281 departures recorded from October 2024 to July 2026, 77.8% left on time, according to the US BTS.
- On-time departures77.8%of 281 flights
- Average delay10.5 min
- July 202623
- Cancelled0.7%
- Legs flown under this number22
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 | 4 | 26 | ▲ 550.0% |
| February | 2 | 25 | ▲ 1,150.0% |
| March | 10 | 25 | ▲ 150.0% |
| April | 26 | 3 | ▼ 88.5% |
| May | 29 | 1 | ▼ 96.6% |
| June | 5 | 19 | ▲ 280.0% |
| July | – | 23 | – |
| August | 11 | – | – |
| September | 13 | – | – |
| October | 17 | – | in progress |
| November | 1 | – | – |
| December | 4 | – | – |
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 | 75.0% | 73.1% | ▼ 2.6% |
| February | 100.0% | 64.0% | ▼ 36.0% |
| March | 90.0% | 56.0% | ▼ 37.8% |
| April | 92.3% | 100.0% | ▲ 8.3% |
| May | 92.9% | 100.0% | ▲ 7.7% |
| June | 100.0% | 63.2% | ▼ 36.8% |
| July | – | 68.2% | – |
| August | 100.0% | – | – |
| September | 100.0% | – | – |
| October | 52.9% | – | in progress |
| November | 0.0% | – | – |
| December | 75.0% | – | – |
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 | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | – | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.3% 279
- 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 |
|---|---|---|---|---|
| LAS LAX Harry Reid International Airport – Los Angeles International Airport | 380 | 12.0 min | 65.5% | 55 |
| DAL STL Dallas Love Field – St. Louis Lambert International Airport | 878 | 0.7 min | 91.8% | 50 |
| IND BWI Indianapolis International Airport – Baltimore/Washington International Thurgood Marshall Airport | 828 | 25.5 min | 65.9% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 76.5% | 0 |
| November 2024 | 14 | 14 | 92.9% | 0 |
| December 2024 | 6 | 6 | 100.0% | 0 |
| January 2025 | 4 | 4 | 75.0% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 10 | 10 | 90.0% | 0 |
| April 2025 | 26 | 26 | 92.3% | 0 |
| May 2025 | 29 | 28 | 92.9% | 1 |
| June 2025 | 5 | 5 | 100.0% | 0 |
| August 2025 | 11 | 11 | 100.0% | 0 |
| September 2025 | 13 | 13 | 100.0% | 0 |
| October 2025 | 17 | 17 | 52.9% | 0 |
| November 2025 | 1 | 1 | 0.0% | 0 |
| December 2025 | 4 | 4 | 75.0% | 0 |
| January 2026 | 26 | 26 | 73.1% | 0 |
| February 2026 | 25 | 25 | 64.0% | 0 |
| March 2026 | 25 | 25 | 56.0% | 0 |
| April 2026 | 3 | 3 | 100.0% | 0 |
| May 2026 | 1 | 1 | 100.0% | 0 |
| June 2026 | 19 | 19 | 63.2% | 0 |
| July 2026 | 23 | 22 | 68.2% | 1 |