WN4458
WN4458 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Baltimore to Miami. Of 468 departures recorded from October 2024 to July 2026, 74.8% left on time, according to the US BTS.
- On-time departures74.8%of 468 flights
- Average delay12.2 min
- July 202617
- Cancelled1.5%
- 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 periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 31 | 0.0% |
| February | 36 | 42 | ▲ 16.7% |
| March | 22 | 6 | ▼ 72.7% |
| April | 4 | 14 | ▲ 250.0% |
| May | – | 18 | – |
| June | – | 14 | – |
| July | – | 17 | – |
| August | 27 | – | – |
| September | 30 | – | – |
| October | 39 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
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 | 79.3% | 90.0% | ▲ 13.5% |
| February | 82.4% | 85.0% | ▲ 3.2% |
| March | 81.8% | 100.0% | ▲ 22.2% |
| April | 100.0% | 92.9% | ▼ 7.1% |
| May | – | 77.8% | – |
| June | – | 78.6% | – |
| July | – | 82.4% | – |
| August | 63.0% | – | – |
| September | 83.3% | – | – |
| October | 15.4% | – | in progress |
| November | 53.6% | – | – |
| December | 55.2% | – | – |
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 | 2 | 1 | ▼ 50.0% |
| February | 2 | 2 | 0.0% |
| 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 98.5% 461
- Cancelled 1.5% 7
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 MIA Baltimore/Washington International Thurgood Marshall Airport – Miami International Airport | 1,526 | 7.4 min | 86.3% | 104 |
| SMF HOU Sacramento International Airport – William P. Hobby Airport | 2,610 | 9.9 min | 74.1% | 58 |
| TPA DEN Tampa International Airport – Denver International Airport | 2,423 | 17.6 min | 56.4% | 55 |
| BWI SAN Baltimore/Washington International Thurgood Marshall Airport – San Diego International Airport | 3,686 | 0.9 min | 94.3% | 55 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 29 | 29 | 100.0% | 0 |
| December 2024 | 31 | 31 | 87.1% | 0 |
| January 2025 | 31 | 29 | 79.3% | 2 |
| February 2025 | 36 | 34 | 82.4% | 2 |
| March 2025 | 22 | 22 | 81.8% | 0 |
| April 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 27 | 27 | 63.0% | 0 |
| September 2025 | 30 | 30 | 83.3% | 0 |
| October 2025 | 39 | 39 | 15.4% | 0 |
| November 2025 | 28 | 28 | 53.6% | 0 |
| December 2025 | 29 | 29 | 55.2% | 0 |
| January 2026 | 31 | 30 | 90.0% | 1 |
| February 2026 | 42 | 40 | 85.0% | 2 |
| March 2026 | 6 | 6 | 100.0% | 0 |
| April 2026 | 14 | 14 | 92.9% | 0 |
| May 2026 | 18 | 18 | 77.8% | 0 |
| June 2026 | 14 | 14 | 78.6% | 0 |
| July 2026 | 17 | 17 | 82.4% | 0 |