WN4440
WN4440 (Southwest Airlines) is a multi-stop service on 18 routes, busiest St Louis to Baltimore. Of 350 departures recorded from October 2024 to July 2026, 82.8% left on time, according to the US BTS.
- On-time departures82.8%of 350 flights
- Average delay7.0 min
- July 202621▲ 162.5%vs July 2025
- Cancelled0.6%
- 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 periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 20 | 3 | ▼ 85.0% |
| February | 19 | 10 | ▼ 47.4% |
| March | 29 | 28 | ▼ 3.4% |
| April | 7 | 30 | ▲ 328.6% |
| May | – | 31 | – |
| June | 8 | 23 | ▲ 187.5% |
| July | 8 | 21 | ▲ 162.5% |
| August | 35 | – | – |
| September | 39 | – | – |
| October | 1 | – | in progress |
| November | 5 | – | – |
| December | 11 | – | – |
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 | 95.0% | 66.7% | ▼ 29.8% |
| February | 73.7% | 100.0% | ▲ 35.7% |
| March | 70.4% | 78.6% | ▲ 11.7% |
| April | 85.7% | 90.0% | ▲ 5.0% |
| May | – | 96.8% | – |
| June | 100.0% | 56.5% | ▼ 43.5% |
| July | 100.0% | 52.4% | ▼ 47.6% |
| August | 97.1% | – | – |
| September | 92.3% | – | – |
| October | 100.0% | – | in progress |
| November | 80.0% | – | – |
| December | 54.6% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 2 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 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 99.4% 348
- Cancelled 0.6% 2
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL BWI St. Louis Lambert International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,185 | -1.6 min | 96.6% | 58 |
| SAN SJC San Diego International Airport – Mineta San Jose International Airport | 671 | -2.0 min | 93.9% | 49 |
| DEN GEG Denver International Airport – Spokane International Airport | 1,343 | 22.5 min | 51.2% | 41 |
| SJC HNL Mineta San Jose International Airport – Daniel K. Inouye International Airport | 3,886 | 5.8 min | 75.8% | 33 |
| MDW SAN Chicago Midway International Airport – San Diego International Airport | 2,776 | 0.2 min | 93.9% | 33 |
| FLL BNA Fort Lauderdale Hollywood International Airport – Nashville International Airport | 1,278 | 20.7 min | 71.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 79.0% | 0 |
| November 2024 | 1 | 1 | 100.0% | 0 |
| December 2024 | 2 | 2 | 100.0% | 0 |
| January 2025 | 20 | 20 | 95.0% | 0 |
| February 2025 | 19 | 19 | 73.7% | 0 |
| March 2025 | 29 | 27 | 70.4% | 2 |
| April 2025 | 7 | 7 | 85.7% | 0 |
| June 2025 | 8 | 8 | 100.0% | 0 |
| July 2025 | 8 | 8 | 100.0% | 0 |
| August 2025 | 35 | 35 | 97.1% | 0 |
| September 2025 | 39 | 39 | 92.3% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 5 | 5 | 80.0% | 0 |
| December 2025 | 11 | 11 | 54.6% | 0 |
| January 2026 | 3 | 3 | 66.7% | 0 |
| February 2026 | 10 | 10 | 100.0% | 0 |
| March 2026 | 28 | 28 | 78.6% | 0 |
| April 2026 | 30 | 30 | 90.0% | 0 |
| May 2026 | 31 | 31 | 96.8% | 0 |
| June 2026 | 23 | 23 | 56.5% | 0 |
| July 2026 | 21 | 21 | 52.4% | 0 |