WN4075
WN4075 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Baltimore to Boston. Of 347 departures recorded from October 2024 to July 2026, 63.6% left on time, according to the US BTS.
- On-time departures63.6%of 347 flights
- Average delay23.9 min
- July 202640▼ 7.0%vs July 2025
- Cancelled2.6%
- 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 | 2 | 10 | ▲ 400.0% |
| February | 2 | 17 | ▲ 750.0% |
| March | 27 | 18 | ▼ 33.3% |
| April | 27 | 4 | ▼ 85.2% |
| May | 26 | – | – |
| June | 42 | 35 | ▼ 16.7% |
| July | 43 | 40 | ▼ 7.0% |
| August | 6 | – | – |
| September | – | – | – |
| October | – | – | 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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 50.0% | 77.8% | ▲ 55.6% |
| February | 100.0% | 41.2% | ▼ 58.8% |
| March | 100.0% | 23.5% | ▼ 76.5% |
| April | 59.3% | 75.0% | ▲ 26.6% |
| May | 42.3% | – | – |
| June | 66.7% | 41.2% | ▼ 38.2% |
| July | 83.3% | 34.3% | ▼ 58.9% |
| August | 83.3% | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 100.0% | – | – |
| December | 50.0% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 1 | – |
| July | 1 | 5 | ▲ 400.0% |
| August | 0 | – | – |
| September | – | – | – |
| October | – | – | 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 97.4% 338
- Cancelled 2.6% 9
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 |
|---|---|---|---|---|
| BWI BOS Baltimore/Washington International Thurgood Marshall Airport – Boston Logan International Airport | 594 | 39.4 min | 46.0% | 50 |
| BDL BWI Bradley International Airport – Baltimore/Washington International Thurgood Marshall Airport | 455 | 39.3 min | 40.0% | 49 |
| SBA DEN Santa Barbara Municipal Airport – Denver International Airport | 1,471 | 23.4 min | 70.5% | 44 |
| OAK SBA Oakland San Francisco Bay Airport – Santa Barbara Municipal Airport | 424 | 7.0 min | 83.3% | 43 |
| HNL OGG Daniel K. Inouye International Airport – Kahului International Airport | 162 | -2.1 min | 97.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 17 | 17 | 100.0% | 0 |
| December 2024 | 6 | 6 | 66.7% | 0 |
| January 2025 | 2 | 2 | 50.0% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 27 | 27 | 100.0% | 0 |
| April 2025 | 27 | 27 | 59.3% | 0 |
| May 2025 | 26 | 26 | 42.3% | 0 |
| June 2025 | 42 | 42 | 66.7% | 0 |
| July 2025 | 43 | 42 | 83.3% | 1 |
| August 2025 | 6 | 6 | 83.3% | 0 |
| November 2025 | 3 | 3 | 100.0% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 10 | 9 | 77.8% | 1 |
| February 2026 | 17 | 17 | 41.2% | 0 |
| March 2026 | 18 | 17 | 23.5% | 1 |
| April 2026 | 4 | 4 | 75.0% | 0 |
| June 2026 | 35 | 34 | 41.2% | 1 |
| July 2026 | 40 | 35 | 34.3% | 5 |