WN4639
WN4639 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Tampa to Austin. Of 294 departures recorded from October 2024 to July 2026, 72.8% left on time, according to the US BTS.
- On-time departures72.8%of 294 flights
- Average delay15.7 min
- July 202630▲ 0.0%vs July 2025
- Cancelled0.0%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 6 | ▲ 500.0% |
| February | – | 42 | – |
| March | – | 13 | – |
| April | 3 | 26 | ▲ 766.7% |
| May | 4 | 31 | ▲ 675.0% |
| June | 27 | 30 | ▲ 11.1% |
| July | 30 | 30 | 0.0% |
| August | 4 | – | – |
| September | – | – | – |
| October | 8 | – | in progress |
| November | 3 | – | – |
| December | 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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 0.0% | 100.0% | – |
| February | – | 54.8% | – |
| March | – | 100.0% | – |
| April | 66.7% | 100.0% | ▲ 50.0% |
| May | 50.0% | 96.8% | ▲ 93.5% |
| June | 59.3% | 60.0% | ▲ 1.2% |
| July | 66.7% | 60.0% | ▼ 10.0% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | 50.0% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 0 | – |
| March | – | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 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 100.0% 294
- Cancelled 0.0% 0
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| TPA AUS Tampa International Airport – Austin Bergstrom International Airport | 1,490 | 27.2 min | 63.3% | 60 |
| PIT STL Pittsburgh International Airport – St. Louis Lambert International Airport | 889 | -1.6 min | 96.6% | 58 |
| HOU DEN William P. Hobby Airport – Denver International Airport | 1,422 | 23.8 min | 59.7% | 57 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 75.0% | 0 |
| November 2024 | 14 | 14 | 78.6% | 0 |
| December 2024 | 4 | 4 | 75.0% | 0 |
| January 2025 | 1 | 1 | 0.0% | 0 |
| April 2025 | 3 | 3 | 66.7% | 0 |
| May 2025 | 4 | 4 | 50.0% | 0 |
| June 2025 | 27 | 27 | 59.3% | 0 |
| July 2025 | 30 | 30 | 66.7% | 0 |
| August 2025 | 4 | 4 | 50.0% | 0 |
| October 2025 | 8 | 8 | 100.0% | 0 |
| November 2025 | 3 | 3 | 100.0% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 6 | 6 | 100.0% | 0 |
| February 2026 | 42 | 42 | 54.8% | 0 |
| March 2026 | 13 | 13 | 100.0% | 0 |
| April 2026 | 26 | 26 | 100.0% | 0 |
| May 2026 | 31 | 31 | 96.8% | 0 |
| June 2026 | 30 | 30 | 60.0% | 0 |
| July 2026 | 30 | 30 | 60.0% | 0 |