WN4439
WN4439 (Southwest Airlines) is a multi-stop service on 14 routes, busiest Tampa to St Louis. Of 295 departures recorded from November 2024 to July 2026, 76.1% left on time, according to the US BTS.
- On-time departures76.1%of 295 flights
- Average delay12.0 min
- July 202631▲ 675.0%vs July 2025
- Cancelled0.7%
- Legs flown under this number14
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 4 | 5 | ▲ 25.0% |
| February | – | 7 | – |
| March | – | 17 | – |
| April | – | 28 | – |
| May | – | 31 | – |
| June | 4 | 30 | ▲ 650.0% |
| July | 4 | 31 | ▲ 675.0% |
| August | 22 | – | – |
| September | 25 | – | – |
| October | 12 | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
according to the US BTS · November 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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 0.0% | 100.0% | – |
| February | – | 14.3% | – |
| March | – | 47.1% | – |
| April | – | 53.6% | – |
| May | – | 41.9% | – |
| June | 100.0% | 90.0% | ▼ 10.0% |
| July | 100.0% | 90.3% | ▼ 9.7% |
| August | 86.4% | – | – |
| September | 92.0% | – | – |
| October | 100.0% | – | in progress |
| November | 82.1% | – | – |
| December | 93.6% | – | – |
according to the US BTS · November 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · November 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 0 | ▼ 100.0% |
| February | – | 0 | – |
| March | – | 0 | – |
| April | – | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
according to the US BTS · November 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% 293
- Cancelled 0.7% 2
Share of all recorded flights in the period, all legs. · Nov 23, 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 |
|---|---|---|---|---|
| TPA STL Tampa International Airport – St. Louis Lambert International Airport | 1,400 | 2.4 min | 89.1% | 64 |
| STL BOS St. Louis Lambert International Airport – Boston Logan International Airport | 1,680 | 39.3 min | 44.8% | 58 |
| BWI PWM Baltimore/Washington International Thurgood Marshall Airport – Portland International Jetport | 727 | 1.2 min | 94.0% | 50 |
| TUS MDW Tucson International Airport – Chicago Midway International Airport | 2,314 | 1.0 min | 94.9% | 39 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| November 2024 | 8 | 8 | 100.0% | 0 |
| December 2024 | 8 | 8 | 50.0% | 0 |
| January 2025 | 4 | 2 | 0.0% | 2 |
| June 2025 | 4 | 4 | 100.0% | 0 |
| July 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 22 | 22 | 86.4% | 0 |
| September 2025 | 25 | 25 | 92.0% | 0 |
| October 2025 | 12 | 12 | 100.0% | 0 |
| November 2025 | 28 | 28 | 82.1% | 0 |
| December 2025 | 31 | 31 | 93.6% | 0 |
| January 2026 | 5 | 5 | 100.0% | 0 |
| February 2026 | 7 | 7 | 14.3% | 0 |
| March 2026 | 17 | 17 | 47.1% | 0 |
| April 2026 | 28 | 28 | 53.6% | 0 |
| May 2026 | 31 | 31 | 41.9% | 0 |
| June 2026 | 30 | 30 | 90.0% | 0 |
| July 2026 | 31 | 31 | 90.3% | 0 |