WN178
WN178 (Southwest Airlines) is a multi-stop service on 37 routes, busiest San Francisco to Las Vegas. Of 728 departures recorded from October 2024 to July 2026, 74.7% left on time, according to the US BTS.
- On-time departures74.7%of 728 flights
- Average delay14.8 min
- July 202632▼ 23.8%vs July 2025
- Cancelled0.6%
- Legs flown under this number37
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 | 28 | 31 | ▲ 10.7% |
| February | 26 | 28 | ▲ 7.7% |
| March | 31 | 31 | 0.0% |
| April | 30 | 40 | ▲ 33.3% |
| May | 31 | 46 | ▲ 48.4% |
| June | 42 | 31 | ▼ 26.2% |
| July | 42 | 32 | ▼ 23.8% |
| August | 48 | – | – |
| September | 47 | – | – |
| October | 23 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 230 | 239 | ▲ 3.9% |
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 | 85.7% | 83.9% | ▼ 2.1% |
| February | 84.6% | 60.7% | ▼ 28.3% |
| March | 80.0% | 35.5% | ▼ 55.7% |
| April | 86.7% | 70.0% | ▼ 19.2% |
| May | 93.3% | 54.4% | ▼ 41.8% |
| June | 92.9% | 50.0% | ▼ 46.2% |
| July | 78.6% | 53.1% | ▼ 32.4% |
| August | 85.4% | – | – |
| September | 72.3% | – | – |
| October | 82.6% | – | in progress |
| November | 89.7% | – | – |
| December | 67.7% | – | – |
| Year-to-date average (Jan–Jul) | 86.0% | 58.2% | ▼ 32.3% |
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 | 0 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 1 | ▼ 50.0% |
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% 724
- Cancelled 0.5% 4
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
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 64.7% | 0 |
| November 2024 | 29 | 29 | 89.7% | 0 |
| December 2024 | 34 | 34 | 82.4% | 0 |
| January 2025 | 28 | 28 | 85.7% | 0 |
| February 2025 | 26 | 26 | 84.6% | 0 |
| March 2025 | 31 | 30 | 80.0% | 1 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 30 | 93.3% | 1 |
| June 2025 | 42 | 42 | 92.9% | 0 |
| July 2025 | 42 | 42 | 78.6% | 0 |
| August 2025 | 48 | 48 | 85.4% | 0 |
| September 2025 | 47 | 47 | 72.3% | 0 |
| October 2025 | 23 | 23 | 82.6% | 0 |
| November 2025 | 30 | 29 | 89.7% | 1 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 31 | 31 | 83.9% | 0 |
| February 2026 | 28 | 28 | 60.7% | 0 |
| March 2026 | 31 | 31 | 35.5% | 0 |
| April 2026 | 40 | 40 | 70.0% | 0 |
| May 2026 | 46 | 46 | 54.4% | 0 |
| June 2026 | 31 | 30 | 50.0% | 1 |
| July 2026 | 32 | 32 | 53.1% | 0 |