WN4009
WN4009 (Southwest Airlines) is a multi-stop service on 22 routes, busiest Baltimore to Greenville. Of 385 departures recorded from October 2024 to July 2026, 74.2% left on time, according to the US BTS.
- On-time departures74.2%of 385 flights
- Average delay11.6 min
- July 202626▲ 136.4%vs July 2025
- Cancelled1.3%
- Legs flown under this number22
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 | 28 | 5 | ▼ 82.1% |
| February | 27 | 3 | ▼ 88.9% |
| March | 25 | 12 | ▼ 52.0% |
| April | 5 | 30 | ▲ 500.0% |
| May | – | 35 | – |
| June | 6 | 22 | ▲ 266.7% |
| July | 11 | 26 | ▲ 136.4% |
| August | – | – | – |
| September | – | – | – |
| October | 52 | – | in progress |
| November | 23 | – | – |
| December | 19 | – | – |
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 | 92.0% | 60.0% | ▼ 34.8% |
| February | 81.5% | 100.0% | ▲ 22.7% |
| March | 72.0% | 58.3% | ▼ 19.0% |
| April | 80.0% | 75.9% | ▼ 5.2% |
| May | – | 57.1% | – |
| June | 50.0% | 90.9% | ▲ 81.8% |
| July | 63.6% | 84.6% | ▲ 33.0% |
| August | – | – | – |
| September | – | – | – |
| October | 76.9% | – | in progress |
| November | 86.4% | – | – |
| December | 52.6% | – | – |
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 | 3 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 1 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| 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 98.7% 380
- Cancelled 1.3% 5
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 GSP Baltimore/Washington International Thurgood Marshall Airport – Greenville-Spartanburg International Airport | 685 | 18.1 min | 66.0% | 51 |
| GSP ATL Greenville-Spartanburg International Airport – Hartsfield Jackson Atlanta International Airport | 247 | -2.5 min | 91.5% | 49 |
| TPA BWI Tampa International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,358 | 5.0 min | 88.1% | 42 |
| DJT ISP President Donald J. Trump International Airport – Long Island MacArthur Airport | 1,696 | 10.6 min | 71.1% | 39 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 71.4% | 0 |
| November 2024 | 23 | 23 | 65.2% | 0 |
| December 2024 | 19 | 19 | 73.7% | 0 |
| January 2025 | 28 | 25 | 92.0% | 3 |
| February 2025 | 27 | 27 | 81.5% | 0 |
| March 2025 | 25 | 25 | 72.0% | 0 |
| April 2025 | 5 | 5 | 80.0% | 0 |
| June 2025 | 6 | 6 | 50.0% | 0 |
| July 2025 | 11 | 11 | 63.6% | 0 |
| October 2025 | 52 | 52 | 76.9% | 0 |
| November 2025 | 23 | 22 | 86.4% | 1 |
| December 2025 | 19 | 19 | 52.6% | 0 |
| January 2026 | 5 | 5 | 60.0% | 0 |
| February 2026 | 3 | 3 | 100.0% | 0 |
| March 2026 | 12 | 12 | 58.3% | 0 |
| April 2026 | 30 | 29 | 75.9% | 1 |
| May 2026 | 35 | 35 | 57.1% | 0 |
| June 2026 | 22 | 22 | 90.9% | 0 |
| July 2026 | 26 | 26 | 84.6% | 0 |