WN4040
WN4040 (Southwest Airlines) is a multi-stop service on 25 routes, busiest Oakland to Las Vegas. Of 346 departures recorded from October 2024 to July 2026, 72.4% left on time, according to the US BTS.
- On-time departures72.4%of 346 flights
- Average delay15.3 min
- July 202636▲ 20.0%vs July 2025
- Cancelled0.6%
- Legs flown under this number25
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 | 1 | 3 | ▲ 200.0% |
| February | 2 | 10 | ▲ 400.0% |
| March | 25 | 29 | ▲ 16.0% |
| April | 29 | 11 | ▼ 62.1% |
| May | 31 | 11 | ▼ 64.5% |
| June | 30 | 30 | 0.0% |
| July | 30 | 36 | ▲ 20.0% |
| August | 4 | – | – |
| September | – | – | – |
| October | 33 | – | in progress |
| November | 6 | – | – |
| December | 11 | – | – |
| Year to date (Jan–Jul) | 148 | 130 | ▼ 12.2% |
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 | 0.0% | 33.3% | – |
| February | 100.0% | 90.0% | ▼ 10.0% |
| March | 52.2% | 75.9% | ▲ 45.4% |
| April | 79.3% | 72.7% | ▼ 8.3% |
| May | 77.4% | 100.0% | ▲ 29.2% |
| June | 83.3% | 63.3% | ▼ 24.0% |
| July | 60.0% | 83.3% | ▲ 38.9% |
| August | 75.0% | – | – |
| September | – | – | – |
| October | 66.7% | – | in progress |
| November | 66.7% | – | – |
| December | 54.6% | – | – |
| Year-to-date average (Jan–Jul) | 64.6% | 74.1% | ▲ 14.7% |
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 | 2 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 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 99.4% 344
- Cancelled 0.6% 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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| OAK LAS Oakland San Francisco Bay Airport – Harry Reid International Airport | 654 | 16.6 min | 70.0% | 60 |
| MDW ECP Chicago Midway International Airport – Northwest Florida Beaches International Airport | 1,283 | 8.7 min | 82.5% | 57 |
| TPA PHX Tampa International Airport – Phoenix Sky Harbor International Airport | 2,872 | 15.1 min | 69.1% | 42 |
| OAK SNA Oakland San Francisco Bay Airport – John Wayne Orange County International Airport | 597 | 10.4 min | 73.3% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 100.0% | 0 |
| November 2024 | 2 | 2 | 0.0% | 0 |
| December 2024 | 2 | 2 | 0.0% | 0 |
| January 2025 | 1 | 1 | 0.0% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 25 | 23 | 52.2% | 2 |
| April 2025 | 29 | 29 | 79.3% | 0 |
| May 2025 | 31 | 31 | 77.4% | 0 |
| June 2025 | 30 | 30 | 83.3% | 0 |
| July 2025 | 30 | 30 | 60.0% | 0 |
| August 2025 | 4 | 4 | 75.0% | 0 |
| October 2025 | 33 | 33 | 66.7% | 0 |
| November 2025 | 6 | 6 | 66.7% | 0 |
| December 2025 | 11 | 11 | 54.6% | 0 |
| January 2026 | 3 | 3 | 33.3% | 0 |
| February 2026 | 10 | 10 | 90.0% | 0 |
| March 2026 | 29 | 29 | 75.9% | 0 |
| April 2026 | 11 | 11 | 72.7% | 0 |
| May 2026 | 11 | 11 | 100.0% | 0 |
| June 2026 | 30 | 30 | 63.3% | 0 |
| July 2026 | 36 | 36 | 83.3% | 0 |