WN4604
WN4604 (Southwest Airlines) is a multi-stop service on 17 routes, busiest St Louis to Baltimore. Of 246 departures recorded from October 2024 to July 2026, 73.4% left on time, according to the US BTS.
- On-time departures73.4%of 246 flights
- Average delay14.8 min
- July 202618▲ 125.0%vs July 2025
- Cancelled0.8%
- Legs flown under this number17
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 | 11 | 1 | ▼ 90.9% |
| February | 17 | 14 | ▼ 17.6% |
| March | 23 | 17 | ▼ 26.1% |
| April | 5 | 4 | ▼ 20.0% |
| May | – | – | – |
| June | 8 | 16 | ▲ 100.0% |
| July | 8 | 18 | ▲ 125.0% |
| August | 2 | – | – |
| September | – | – | – |
| October | 26 | – | 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 | 90.0% | 100.0% | ▲ 11.1% |
| February | 64.7% | 15.4% | ▼ 76.2% |
| March | 73.9% | 88.2% | ▲ 19.4% |
| April | 100.0% | 100.0% | 0.0% |
| May | – | – | – |
| June | 100.0% | 62.5% | ▼ 37.5% |
| July | 100.0% | 44.4% | ▼ 55.6% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | 57.7% | – | in progress |
| November | 66.7% | – | – |
| December | 100.0% | – | – |
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 | 1 | 0 | ▼ 100.0% |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | – | – | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| 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 99.2% 244
- Cancelled 0.8% 2
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL BWI St. Louis Lambert International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,185 | 14.1 min | 80.0% | 76 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 13 | 13 | 84.6% | 0 |
| November 2024 | 30 | 30 | 83.3% | 0 |
| December 2024 | 28 | 28 | 89.3% | 0 |
| January 2025 | 11 | 10 | 90.0% | 1 |
| February 2025 | 17 | 17 | 64.7% | 0 |
| March 2025 | 23 | 23 | 73.9% | 0 |
| April 2025 | 5 | 5 | 100.0% | 0 |
| June 2025 | 8 | 8 | 100.0% | 0 |
| July 2025 | 8 | 8 | 100.0% | 0 |
| August 2025 | 2 | 2 | 50.0% | 0 |
| October 2025 | 26 | 26 | 57.7% | 0 |
| November 2025 | 3 | 3 | 66.7% | 0 |
| December 2025 | 2 | 2 | 100.0% | 0 |
| January 2026 | 1 | 1 | 100.0% | 0 |
| February 2026 | 14 | 13 | 15.4% | 1 |
| March 2026 | 17 | 17 | 88.2% | 0 |
| April 2026 | 4 | 4 | 100.0% | 0 |
| June 2026 | 16 | 16 | 62.5% | 0 |
| July 2026 | 18 | 18 | 44.4% | 0 |