WN4186
WN4186 (Southwest Airlines) is a multi-stop service on 27 routes, busiest Louisville to Baltimore. Of 396 departures recorded from October 2024 to July 2026, 68.6% left on time, according to the US BTS.
- On-time departures68.6%of 396 flights
- Average delay16.1 min
- July 202631▲ 82.4%vs July 2025
- Cancelled1.0%
- Legs flown under this number27
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 6 | – |
| February | 10 | 41 | ▲ 310.0% |
| March | 34 | 18 | ▼ 47.1% |
| April | 18 | 27 | ▲ 50.0% |
| May | 14 | 31 | ▲ 121.4% |
| June | 17 | 30 | ▲ 76.5% |
| July | 17 | 31 | ▲ 82.4% |
| August | 19 | – | – |
| September | 17 | – | – |
| October | 18 | – | in progress |
| November | 3 | – | – |
| December | 2 | – | – |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 83.3% | – |
| February | 90.0% | 87.2% | ▼ 3.1% |
| March | 72.7% | 61.1% | ▼ 16.0% |
| April | 77.8% | 92.6% | ▲ 19.0% |
| May | 85.7% | 100.0% | ▲ 16.7% |
| June | 64.7% | 20.0% | ▼ 69.1% |
| July | 56.3% | 25.8% | ▼ 54.1% |
| August | 57.9% | – | – |
| September | 35.3% | – | – |
| October | 77.8% | – | in progress |
| November | 66.7% | – | – |
| December | 0.0% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | 0 | 2 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| 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 99.0% 392
- Cancelled 1.0% 4
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SDF BWI Louisville Muhammad Ali International Airport – Baltimore/Washington International Thurgood Marshall Airport | 795 | -4.1 min | 100.0% | 58 |
| SAN SJC San Diego International Airport – Mineta San Jose International Airport | 671 | 50.2 min | 18.0% | 50 |
| PHL DAL Philadelphia International Airport – Dallas Love Field | 2,080 | 19.4 min | 60.0% | 36 |
| BWI BUF Baltimore/Washington International Thurgood Marshall Airport – Buffalo Niagara International Airport | 453 | 13.9 min | 65.6% | 33 |
| SAN DEN San Diego International Airport – Denver International Airport | 1,371 | 40.3 min | 43.8% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 87.5% | 0 |
| November 2024 | 3 | 3 | 66.7% | 0 |
| February 2025 | 10 | 10 | 90.0% | 0 |
| March 2025 | 34 | 33 | 72.7% | 1 |
| April 2025 | 18 | 18 | 77.8% | 0 |
| May 2025 | 14 | 14 | 85.7% | 0 |
| June 2025 | 17 | 17 | 64.7% | 0 |
| July 2025 | 17 | 16 | 56.3% | 1 |
| August 2025 | 19 | 19 | 57.9% | 0 |
| September 2025 | 17 | 17 | 35.3% | 0 |
| October 2025 | 18 | 18 | 77.8% | 0 |
| November 2025 | 3 | 3 | 66.7% | 0 |
| December 2025 | 2 | 2 | 0.0% | 0 |
| January 2026 | 6 | 6 | 83.3% | 0 |
| February 2026 | 41 | 39 | 87.2% | 2 |
| March 2026 | 18 | 18 | 61.1% | 0 |
| April 2026 | 27 | 27 | 92.6% | 0 |
| May 2026 | 31 | 31 | 100.0% | 0 |
| June 2026 | 30 | 30 | 20.0% | 0 |
| July 2026 | 31 | 31 | 25.8% | 0 |