WN4381
WN4381 (Southwest Airlines) is a multi-stop service on 16 routes, busiest Las Vegas to Denver. Of 291 departures recorded from October 2024 to July 2026, 72.7% left on time, according to the US BTS.
- On-time departures72.7%of 291 flights
- Average delay13.4 min
- July 202614▲ 16.7%vs July 2025
- Cancelled0.7%
- Legs flown under this number16
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 | 30 | 1 | ▼ 96.7% |
| February | 26 | 10 | ▼ 61.5% |
| March | 30 | 2 | ▼ 93.3% |
| April | 10 | – | – |
| May | 5 | 1 | ▼ 80.0% |
| June | 13 | 12 | ▼ 7.7% |
| July | 12 | 14 | ▲ 16.7% |
| August | 23 | – | – |
| September | 22 | – | – |
| October | 1 | – | in progress |
| November | 3 | – | – |
| December | 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 | 83.3% | 100.0% | ▲ 20.0% |
| February | 73.1% | 44.4% | ▼ 39.2% |
| March | 80.0% | 50.0% | ▼ 37.5% |
| April | 90.0% | – | – |
| May | 20.0% | 0.0% | ▼ 100.0% |
| June | 61.5% | 41.7% | ▼ 32.3% |
| July | 33.3% | 28.6% | ▼ 14.3% |
| August | 87.0% | – | – |
| September | 86.4% | – | – |
| October | 100.0% | – | in progress |
| November | 33.3% | – | – |
| December | 50.0% | – | – |
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 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | – | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| 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% 289
- Cancelled 0.7% 2
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS DEN Harry Reid International Airport – Denver International Airport | 1,009 | 7.5 min | 83.1% | 83 |
| STL BNA St. Louis Lambert International Airport – Nashville International Airport | 437 | 1.2 min | 88.4% | 43 |
| MDW CVG Chicago Midway International Airport – Cincinnati Northern Kentucky International Airport | 401 | 17.2 min | 78.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 22 | 22 | 86.4% | 0 |
| December 2024 | 32 | 31 | 90.3% | 1 |
| January 2025 | 30 | 30 | 83.3% | 0 |
| February 2025 | 26 | 26 | 73.1% | 0 |
| March 2025 | 30 | 30 | 80.0% | 0 |
| April 2025 | 10 | 10 | 90.0% | 0 |
| May 2025 | 5 | 5 | 20.0% | 0 |
| June 2025 | 13 | 13 | 61.5% | 0 |
| July 2025 | 12 | 12 | 33.3% | 0 |
| August 2025 | 23 | 23 | 87.0% | 0 |
| September 2025 | 22 | 22 | 86.4% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 3 | 3 | 33.3% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 1 | 1 | 100.0% | 0 |
| February 2026 | 10 | 9 | 44.4% | 1 |
| March 2026 | 2 | 2 | 50.0% | 0 |
| May 2026 | 1 | 1 | 0.0% | 0 |
| June 2026 | 12 | 12 | 41.7% | 0 |
| July 2026 | 14 | 14 | 28.6% | 0 |