WN4143
WN4143 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Baltimore to Fort Lauderdale. Of 440 departures recorded from October 2024 to July 2026, 67.1% left on time, according to the US BTS.
- On-time departures67.1%of 440 flights
- Average delay17.6 min
- July 202631▼ 43.6%vs July 2025
- Cancelled0.7%
- Legs flown under this number18
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 | 34 | – | – |
| February | 35 | – | – |
| March | 40 | – | – |
| April | 9 | 12 | ▲ 33.3% |
| May | 1 | 13 | ▲ 1,200.0% |
| June | 50 | 28 | ▼ 44.0% |
| July | 55 | 31 | ▼ 43.6% |
| August | 22 | – | – |
| September | 17 | – | – |
| October | 26 | – | in progress |
| November | 1 | – | – |
| December | – | – | – |
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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 72.7% | – | – |
| February | 80.0% | – | – |
| March | 77.5% | – | – |
| April | 66.7% | 83.3% | ▲ 25.0% |
| May | 100.0% | 61.5% | ▼ 38.5% |
| June | 69.4% | 7.1% | ▼ 89.7% |
| July | 87.3% | 25.8% | ▼ 70.4% |
| August | 59.1% | – | – |
| September | 56.3% | – | – |
| October | 69.2% | – | in progress |
| November | 100.0% | – | – |
| December | – | – | – |
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 periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | – | – |
| February | 0 | – | – |
| March | 0 | – | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
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% 437
- Cancelled 0.7% 3
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BWI FLL Baltimore/Washington International Thurgood Marshall Airport – Fort Lauderdale Hollywood International Airport | 1,493 | 19.1 min | 75.0% | 109 |
| SJC ONT Mineta San Jose International Airport – Ontario International Airport | 536 | 5.1 min | 86.7% | 60 |
| AUS LAS Austin Bergstrom International Airport – Harry Reid International Airport | 1,752 | 36.3 min | 16.0% | 50 |
| SJC LAS Mineta San Jose International Airport – Harry Reid International Airport | 620 | 30.7 min | 50.0% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 82.4% | 0 |
| November 2024 | 26 | 26 | 76.9% | 0 |
| December 2024 | 23 | 23 | 78.3% | 0 |
| January 2025 | 34 | 33 | 72.7% | 1 |
| February 2025 | 35 | 35 | 80.0% | 0 |
| March 2025 | 40 | 40 | 77.5% | 0 |
| April 2025 | 9 | 9 | 66.7% | 0 |
| May 2025 | 1 | 1 | 100.0% | 0 |
| June 2025 | 50 | 49 | 69.4% | 1 |
| July 2025 | 55 | 55 | 87.3% | 0 |
| August 2025 | 22 | 22 | 59.1% | 0 |
| September 2025 | 17 | 16 | 56.3% | 1 |
| October 2025 | 26 | 26 | 69.2% | 0 |
| November 2025 | 1 | 1 | 100.0% | 0 |
| April 2026 | 12 | 12 | 83.3% | 0 |
| May 2026 | 13 | 13 | 61.5% | 0 |
| June 2026 | 28 | 28 | 7.1% | 0 |
| July 2026 | 31 | 31 | 25.8% | 0 |