WN4318
WN4318 (Southwest Airlines) is a multi-stop service on 21 routes, busiest Las Vegas to San Diego. Of 392 departures recorded from October 2024 to July 2026, 80.0% left on time, according to the US BTS.
- On-time departures80.0%of 392 flights
- Average delay11.6 min
- July 202637▲ 825.0%vs July 2025
- Cancelled0.5%
- Legs flown under this number21
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 | 1 | 5 | ▲ 400.0% |
| February | 16 | 11 | ▼ 31.3% |
| March | 18 | 27 | ▲ 50.0% |
| April | 16 | 29 | ▲ 81.3% |
| May | 18 | 30 | ▲ 66.7% |
| June | 6 | 33 | ▲ 450.0% |
| July | 4 | 37 | ▲ 825.0% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 1 | – | in progress |
| November | 26 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 79 | 172 | ▲ 117.7% |
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 | 100.0% | 80.0% | ▼ 20.0% |
| February | 66.7% | 100.0% | ▲ 50.0% |
| March | 55.6% | 77.8% | ▲ 40.0% |
| April | 43.8% | 96.6% | ▲ 120.7% |
| May | 83.3% | 96.7% | ▲ 16.0% |
| June | 50.0% | 87.9% | ▲ 75.8% |
| July | 50.0% | 89.2% | ▲ 78.4% |
| August | 79.3% | – | – |
| September | 70.0% | – | – |
| October | 100.0% | – | in progress |
| November | 76.0% | – | – |
| December | 72.4% | – | – |
| Year-to-date average (Jan–Jul) | 64.2% | 89.7% | ▲ 39.8% |
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 | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| 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 99.5% 390
- Cancelled 0.5% 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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS SAN Harry Reid International Airport – San Diego International Airport | 417 | 14.9 min | 74.1% | 59 |
| SAN ABQ San Diego International Airport – Albuquerque International Sunport | 1,009 | 15.8 min | 74.1% | 58 |
| SMF BUR Sacramento International Airport – Hollywood Burbank/Bob Hope Airport | 577 | -1.8 min | 98.3% | 57 |
| STL OMA St. Louis Lambert International Airport – Eppley Airfield | 549 | 7.9 min | 95.1% | 41 |
| SEA SJC Seattle–Tacoma International Airport – Mineta San Jose International Airport | 1,122 | 14.7 min | 71.9% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 6 | 6 | 83.3% | 0 |
| November 2024 | 14 | 14 | 92.9% | 0 |
| December 2024 | 6 | 6 | 100.0% | 0 |
| January 2025 | 1 | 1 | 100.0% | 0 |
| February 2025 | 16 | 15 | 66.7% | 1 |
| March 2025 | 18 | 18 | 55.6% | 0 |
| April 2025 | 16 | 16 | 43.8% | 0 |
| May 2025 | 18 | 18 | 83.3% | 0 |
| June 2025 | 6 | 6 | 50.0% | 0 |
| July 2025 | 4 | 4 | 50.0% | 0 |
| August 2025 | 29 | 29 | 79.3% | 0 |
| September 2025 | 30 | 30 | 70.0% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 26 | 25 | 76.0% | 1 |
| December 2025 | 29 | 29 | 72.4% | 0 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| February 2026 | 11 | 11 | 100.0% | 0 |
| March 2026 | 27 | 27 | 77.8% | 0 |
| April 2026 | 29 | 29 | 96.6% | 0 |
| May 2026 | 30 | 30 | 96.7% | 0 |
| June 2026 | 33 | 33 | 87.9% | 0 |
| July 2026 | 37 | 37 | 89.2% | 0 |