WN3943
WN3943 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Denver to Birmingham. Of 333 departures recorded from October 2024 to July 2026, 71.3% left on time, according to the US BTS.
- On-time departures71.3%of 333 flights
- Average delay12.1 min
- July 202617
- Cancelled0.6%
- Legs flown under this number19
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 | 29 | 15 | ▼ 48.3% |
| February | 28 | 33 | ▲ 17.9% |
| March | 9 | 15 | ▲ 66.7% |
| April | 1 | 12 | ▲ 1,100.0% |
| May | – | 13 | – |
| June | – | 17 | – |
| July | – | 17 | – |
| August | 8 | – | – |
| September | 8 | – | – |
| October | 4 | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
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 | 65.5% | 64.3% | ▼ 1.9% |
| February | 67.9% | 28.1% | ▼ 58.5% |
| March | 88.9% | 40.0% | ▼ 55.0% |
| April | 100.0% | 50.0% | ▼ 50.0% |
| May | – | 61.5% | – |
| June | – | 94.1% | – |
| July | – | 94.1% | – |
| August | 100.0% | – | – |
| September | 87.5% | – | – |
| October | 50.0% | – | in progress |
| November | 100.0% | – | – |
| December | 74.2% | – | – |
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 | 1 | – |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | – | 0 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.4% 331
- Cancelled 0.6% 2
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN BHM Denver International Airport – Birmingham-Shuttlesworth International Airport | 1,740 | 13.5 min | 73.5% | 83 |
| OGG LIH Kahului International Airport – Lihue Airport | 324 | 5.9 min | 82.8% | 64 |
| STL MCI St. Louis Lambert International Airport – Kansas City International Airport | 380 | 1.0 min | 93.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 23 | 23 | 91.3% | 0 |
| November 2024 | 16 | 16 | 62.5% | 0 |
| December 2024 | 26 | 26 | 76.9% | 0 |
| January 2025 | 29 | 29 | 65.5% | 0 |
| February 2025 | 28 | 28 | 67.9% | 0 |
| March 2025 | 9 | 9 | 88.9% | 0 |
| April 2025 | 1 | 1 | 100.0% | 0 |
| August 2025 | 8 | 8 | 100.0% | 0 |
| September 2025 | 8 | 8 | 87.5% | 0 |
| October 2025 | 4 | 4 | 50.0% | 0 |
| November 2025 | 28 | 28 | 100.0% | 0 |
| December 2025 | 31 | 31 | 74.2% | 0 |
| January 2026 | 15 | 14 | 64.3% | 1 |
| February 2026 | 33 | 32 | 28.1% | 1 |
| March 2026 | 15 | 15 | 40.0% | 0 |
| April 2026 | 12 | 12 | 50.0% | 0 |
| May 2026 | 13 | 13 | 61.5% | 0 |
| June 2026 | 17 | 17 | 94.1% | 0 |
| July 2026 | 17 | 17 | 94.1% | 0 |