WN431
WN431 (Southwest Airlines) is a multi-stop service on 43 routes, busiest San Diego to San Francisco. Of 864 departures recorded from October 2024 to July 2026, 82.8% left on time, according to the US BTS.
- On-time departures82.8%of 864 flights
- Average delay7.9 min
- July 202644▲ 109.5%vs July 2025
- Cancelled1.0%
- Legs flown under this number43
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 | 59 | 33 | ▼ 44.1% |
| February | 68 | 42 | ▼ 38.2% |
| March | 37 | 33 | ▼ 10.8% |
| April | 38 | 32 | ▼ 15.8% |
| May | 38 | 36 | ▼ 5.3% |
| June | 26 | 41 | ▲ 57.7% |
| July | 21 | 44 | ▲ 109.5% |
| August | 39 | – | – |
| September | 39 | – | – |
| October | 32 | – | in progress |
| November | 32 | – | – |
| December | 22 | – | – |
| Year to date (Jan–Jul) | 287 | 261 | ▼ 9.1% |
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 | 88.1% | 66.7% | ▼ 24.4% |
| February | 82.4% | 80.0% | ▼ 2.9% |
| March | 74.3% | 66.7% | ▼ 10.3% |
| April | 89.5% | 87.5% | ▼ 2.2% |
| May | 86.8% | 85.7% | ▼ 1.3% |
| June | 76.9% | 78.1% | ▲ 1.5% |
| July | 57.1% | 88.6% | ▲ 55.1% |
| August | 100.0% | – | – |
| September | 89.7% | – | – |
| October | 59.4% | – | in progress |
| November | 83.3% | – | – |
| December | 68.2% | – | – |
| Year-to-date average (Jan–Jul) | 79.3% | 79.0% | ▼ 0.3% |
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 | 2 | – |
| March | 2 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 3 | ▲ 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 99.0% 855
- Cancelled 1.0% 9
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
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 23 | 23 | 95.7% | 0 |
| November 2024 | 54 | 53 | 86.8% | 1 |
| December 2024 | 75 | 75 | 93.3% | 0 |
| January 2025 | 59 | 59 | 88.1% | 0 |
| February 2025 | 68 | 68 | 82.4% | 0 |
| March 2025 | 37 | 35 | 74.3% | 2 |
| April 2025 | 38 | 38 | 89.5% | 0 |
| May 2025 | 38 | 38 | 86.8% | 0 |
| June 2025 | 26 | 26 | 76.9% | 0 |
| July 2025 | 21 | 21 | 57.1% | 0 |
| August 2025 | 39 | 38 | 100.0% | 1 |
| September 2025 | 39 | 39 | 89.7% | 0 |
| October 2025 | 32 | 32 | 59.4% | 0 |
| November 2025 | 32 | 30 | 83.3% | 2 |
| December 2025 | 22 | 22 | 68.2% | 0 |
| January 2026 | 33 | 33 | 66.7% | 0 |
| February 2026 | 42 | 40 | 80.0% | 2 |
| March 2026 | 33 | 33 | 66.7% | 0 |
| April 2026 | 32 | 32 | 87.5% | 0 |
| May 2026 | 36 | 35 | 85.7% | 1 |
| June 2026 | 41 | 41 | 78.1% | 0 |
| July 2026 | 44 | 44 | 88.6% | 0 |