WN4339
WN4339 (Southwest Airlines) is a multi-stop service on 29 routes, busiest Las Vegas to Oakland. Of 438 departures recorded from October 2024 to July 2026, 81.2% left on time, according to the US BTS.
- On-time departures81.2%of 438 flights
- Average delay9.6 min
- July 202617▲ 112.5%vs July 2025
- Cancelled0.5%
- Legs flown under this number29
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 | 23 | 39 | ▲ 69.6% |
| February | 21 | 49 | ▲ 133.3% |
| March | 30 | 34 | ▲ 13.3% |
| April | 10 | 20 | ▲ 100.0% |
| May | 4 | 18 | ▲ 350.0% |
| June | 9 | 18 | ▲ 100.0% |
| July | 8 | 17 | ▲ 112.5% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 27 | – | in progress |
| November | 7 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 105 | 195 | ▲ 85.7% |
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 | 91.3% | 100.0% | ▲ 9.5% |
| February | 76.2% | 87.5% | ▲ 14.8% |
| March | 76.7% | 94.1% | ▲ 22.8% |
| April | 60.0% | 70.0% | ▲ 16.7% |
| May | 100.0% | 61.1% | ▼ 38.9% |
| June | 88.9% | 29.4% | ▼ 66.9% |
| July | 87.5% | 29.4% | ▼ 66.4% |
| August | 89.7% | – | – |
| September | 93.3% | – | – |
| October | 88.9% | – | in progress |
| November | 85.7% | – | – |
| December | 50.0% | – | – |
| Year-to-date average (Jan–Jul) | 82.9% | 67.4% | ▼ 18.8% |
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 | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 2 |
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% 436
- 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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS OAK Harry Reid International Airport – Oakland San Francisco Bay Airport | 654 | 7.3 min | 85.7% | 70 |
| STL SMF St. Louis Lambert International Airport – Sacramento International Airport | 2,695 | 6.0 min | 91.4% | 58 |
| LAS RNO Harry Reid International Airport – Reno Tahoe International Airport | 556 | 0.4 min | 91.4% | 36 |
| LAX BWI Los Angeles International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,740 | 19.9 min | 61.8% | 34 |
| LAS TUL Harry Reid International Airport – Tulsa International Airport | 1,727 | 42.9 min | 25.0% | 33 |
| BWI CMH Baltimore/Washington International Thurgood Marshall Airport – John Glenn Columbus International Airport | 541 | 24.6 min | 66.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 100.0% | 0 |
| November 2024 | 13 | 13 | 84.6% | 0 |
| December 2024 | 21 | 21 | 76.2% | 0 |
| January 2025 | 23 | 23 | 91.3% | 0 |
| February 2025 | 21 | 21 | 76.2% | 0 |
| March 2025 | 30 | 30 | 76.7% | 0 |
| April 2025 | 10 | 10 | 60.0% | 0 |
| May 2025 | 4 | 4 | 100.0% | 0 |
| June 2025 | 9 | 9 | 88.9% | 0 |
| July 2025 | 8 | 8 | 87.5% | 0 |
| August 2025 | 29 | 29 | 89.7% | 0 |
| September 2025 | 30 | 30 | 93.3% | 0 |
| October 2025 | 27 | 27 | 88.9% | 0 |
| November 2025 | 7 | 7 | 85.7% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 39 | 39 | 100.0% | 0 |
| February 2026 | 49 | 48 | 87.5% | 1 |
| March 2026 | 34 | 34 | 94.1% | 0 |
| April 2026 | 20 | 20 | 70.0% | 0 |
| May 2026 | 18 | 18 | 61.1% | 0 |
| June 2026 | 18 | 17 | 29.4% | 1 |
| July 2026 | 17 | 17 | 29.4% | 0 |