WN643
WN643 (Southwest Airlines) is a multi-stop service on 37 routes, busiest Tampa to Austin. Of 740 departures recorded from October 2024 to July 2026, 75.1% left on time, according to the US BTS.
- On-time departures75.1%of 740 flights
- Average delay11.9 min
- July 202620▼ 39.4%vs July 2025
- Cancelled0.7%
- 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 | 48 | 35 | ▼ 27.1% |
| February | 29 | 29 | 0.0% |
| March | 32 | 31 | ▼ 3.1% |
| April | 48 | 33 | ▼ 31.3% |
| May | 59 | 36 | ▼ 39.0% |
| June | 32 | 37 | ▲ 15.6% |
| July | 33 | 20 | ▼ 39.4% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 36 | – | – |
| December | 43 | – | – |
| Year to date (Jan–Jul) | 281 | 221 | ▼ 21.4% |
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 | 77.1% | 93.6% | ▲ 21.4% |
| February | 75.9% | 89.7% | ▲ 18.2% |
| March | 93.8% | 90.3% | ▼ 3.7% |
| April | 70.8% | 100.0% | ▲ 41.2% |
| May | 71.2% | 83.3% | ▲ 17.1% |
| June | 71.9% | 40.5% | ▼ 43.6% |
| July | 90.9% | 10.0% | ▼ 89.0% |
| August | 71.0% | – | – |
| September | 58.6% | – | – |
| October | 74.2% | – | in progress |
| November | 86.1% | – | – |
| December | 74.4% | – | – |
| Year-to-date average (Jan–Jul) | 78.8% | 72.5% | ▼ 8.0% |
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 | 4 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 4 |
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 99.3% 735
- Cancelled 0.7% 5
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
9Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 24 | 24 | 83.3% | 0 |
| November 2024 | 17 | 17 | 76.5% | 0 |
| December 2024 | 26 | 26 | 50.0% | 0 |
| January 2025 | 48 | 48 | 77.1% | 0 |
| February 2025 | 29 | 29 | 75.9% | 0 |
| March 2025 | 32 | 32 | 93.8% | 0 |
| April 2025 | 48 | 48 | 70.8% | 0 |
| May 2025 | 59 | 59 | 71.2% | 0 |
| June 2025 | 32 | 32 | 71.9% | 0 |
| July 2025 | 33 | 33 | 90.9% | 0 |
| August 2025 | 31 | 31 | 71.0% | 0 |
| September 2025 | 30 | 29 | 58.6% | 1 |
| October 2025 | 31 | 31 | 74.2% | 0 |
| November 2025 | 36 | 36 | 86.1% | 0 |
| December 2025 | 43 | 43 | 74.4% | 0 |
| January 2026 | 35 | 31 | 93.6% | 4 |
| February 2026 | 29 | 29 | 89.7% | 0 |
| March 2026 | 31 | 31 | 90.3% | 0 |
| April 2026 | 33 | 33 | 100.0% | 0 |
| May 2026 | 36 | 36 | 83.3% | 0 |
| June 2026 | 37 | 37 | 40.5% | 0 |
| July 2026 | 20 | 20 | 10.0% | 0 |