WN4158
WN4158 (Southwest Airlines) is a multi-stop service on 20 routes, busiest West Palm Beach to Baltimore. Of 249 departures recorded from October 2024 to July 2026, 73.6% left on time, according to the US BTS.
- On-time departures73.6%of 249 flights
- Average delay15.0 min
- July 202616▲ 300.0%vs July 2025
- Cancelled1.2%
- Legs flown under this number20
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 7 | 8 | ▲ 14.3% |
| February | 17 | 10 | ▼ 41.2% |
| March | 29 | 32 | ▲ 10.3% |
| April | 7 | 7 | 0.0% |
| May | 1 | 2 | ▲ 100.0% |
| June | 4 | 4 | 0.0% |
| July | 4 | 16 | ▲ 300.0% |
| August | 19 | – | – |
| September | 21 | – | – |
| October | 26 | – | in progress |
| November | 4 | – | – |
| December | 11 | – | – |
| Year to date (Jan–Jul) | 69 | 79 | ▲ 14.5% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 71.4% | 75.0% | ▲ 5.0% |
| February | 76.5% | 90.0% | ▲ 17.7% |
| March | 92.9% | 63.3% | ▼ 31.8% |
| April | 71.4% | 71.4% | 0.0% |
| May | 100.0% | 0.0% | ▼ 100.0% |
| June | 75.0% | 50.0% | ▼ 33.3% |
| July | 75.0% | 100.0% | ▲ 33.3% |
| August | 47.4% | – | – |
| September | 61.9% | – | – |
| October | 69.2% | – | in progress |
| November | 100.0% | – | – |
| December | 90.9% | – | – |
| Year-to-date average (Jan–Jul) | 80.3% | 64.3% | ▼ 20.0% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 1 | 2 | ▲ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 2 | ▲ 100.0% |
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 98.8% 246
- Cancelled 1.2% 3
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PNS BNA Pensacola International Airport – Nashville International Airport | 630 | -0.5 min | 90.6% | 33 |
| DJT BWI President Donald J. Trump International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,425 | 27.4 min | 64.5% | 33 |
| RIC BNA Richmond International Airport – Nashville International Airport | 847 | 22.0 min | 53.1% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 70.0% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| December 2024 | 8 | 8 | 62.5% | 0 |
| January 2025 | 7 | 7 | 71.4% | 0 |
| February 2025 | 17 | 17 | 76.5% | 0 |
| March 2025 | 29 | 28 | 92.9% | 1 |
| April 2025 | 7 | 7 | 71.4% | 0 |
| May 2025 | 1 | 1 | 100.0% | 0 |
| June 2025 | 4 | 4 | 75.0% | 0 |
| July 2025 | 4 | 4 | 75.0% | 0 |
| August 2025 | 19 | 19 | 47.4% | 0 |
| September 2025 | 21 | 21 | 61.9% | 0 |
| October 2025 | 26 | 26 | 69.2% | 0 |
| November 2025 | 4 | 4 | 100.0% | 0 |
| December 2025 | 11 | 11 | 90.9% | 0 |
| January 2026 | 8 | 8 | 75.0% | 0 |
| February 2026 | 10 | 10 | 90.0% | 0 |
| March 2026 | 32 | 30 | 63.3% | 2 |
| April 2026 | 7 | 7 | 71.4% | 0 |
| May 2026 | 2 | 2 | 0.0% | 0 |
| June 2026 | 4 | 4 | 50.0% | 0 |
| July 2026 | 16 | 16 | 100.0% | 0 |