WN4537
WN4537 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Baltimore to Miami. Of 314 departures recorded from October 2024 to July 2026, 74.4% left on time, according to the US BTS.
- On-time departures74.4%of 314 flights
- Average delay13.5 min
- July 202630
- Cancelled0.6%
- 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 | – | 4 | – |
| February | 8 | 7 | ▼ 12.5% |
| March | 27 | 24 | ▼ 11.1% |
| April | 21 | 5 | ▼ 76.2% |
| May | 16 | – | – |
| June | 3 | 27 | ▲ 800.0% |
| July | – | 30 | – |
| August | 41 | – | – |
| September | 47 | – | – |
| October | 1 | – | in progress |
| November | 20 | – | – |
| December | 17 | – | – |
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 | – | 75.0% | – |
| February | 87.5% | 0.0% | ▼ 100.0% |
| March | 85.2% | 81.8% | ▼ 4.0% |
| April | 85.7% | 100.0% | ▲ 16.7% |
| May | 100.0% | – | – |
| June | 66.7% | 63.0% | ▼ 5.6% |
| July | – | 60.0% | – |
| August | 70.7% | – | – |
| September | 91.5% | – | – |
| October | 100.0% | – | in progress |
| November | 65.0% | – | – |
| December | 58.8% | – | – |
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 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 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% 312
- Cancelled 0.6% 2
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BWI MIA Baltimore/Washington International Thurgood Marshall Airport – Miami International Airport | 1,526 | 11.7 min | 87.9% | 58 |
| IND MCO Indianapolis International Airport – Orlando International Airport | 1,336 | 23.3 min | 61.4% | 57 |
| LGB LAS Long Beach International Airport – Harry Reid International Airport | 372 | 16.7 min | 62.5% | 40 |
| OMA MDW Eppley Airfield – Chicago Midway International Airport | 679 | 4.8 min | 93.9% | 33 |
| DEN ELP Denver International Airport – El Paso International Airport | 908 | 7.1 min | 81.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 56.3% | 0 |
| February 2025 | 8 | 8 | 87.5% | 0 |
| March 2025 | 27 | 27 | 85.2% | 0 |
| April 2025 | 21 | 21 | 85.7% | 0 |
| May 2025 | 16 | 16 | 100.0% | 0 |
| June 2025 | 3 | 3 | 66.7% | 0 |
| August 2025 | 41 | 41 | 70.7% | 0 |
| September 2025 | 47 | 47 | 91.5% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 20 | 20 | 65.0% | 0 |
| December 2025 | 17 | 17 | 58.8% | 0 |
| January 2026 | 4 | 4 | 75.0% | 0 |
| February 2026 | 7 | 7 | 0.0% | 0 |
| March 2026 | 24 | 22 | 81.8% | 2 |
| April 2026 | 5 | 5 | 100.0% | 0 |
| June 2026 | 27 | 27 | 63.0% | 0 |
| July 2026 | 30 | 30 | 60.0% | 0 |