WN4425
WN4425 (Southwest Airlines) is a multi-stop service on 13 routes, busiest St Louis to Washington. Of 320 departures recorded from October 2024 to July 2026, 63.3% left on time, according to the US BTS.
- On-time departures63.3%of 320 flights
- Average delay18.9 min
- July 202626▲ 100.0%vs July 2025
- Cancelled0.3%
- Legs flown under this number13
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 | 5 | ▲ 150.0% |
| February | – | 7 | – |
| March | – | 27 | – |
| April | 20 | 30 | ▲ 50.0% |
| May | 25 | 31 | ▲ 24.0% |
| June | 16 | 26 | ▲ 62.5% |
| July | 13 | 26 | ▲ 100.0% |
| August | 5 | – | – |
| September | 4 | – | – |
| October | – | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
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 | 100.0% | 40.0% | ▼ 60.0% |
| February | – | 57.1% | – |
| March | – | 77.8% | – |
| April | 60.0% | 60.0% | 0.0% |
| May | 60.0% | 51.6% | ▼ 14.0% |
| June | 56.3% | 57.7% | ▲ 2.6% |
| July | 53.9% | 61.5% | ▲ 14.3% |
| August | 40.0% | – | – |
| September | 50.0% | – | – |
| October | – | – | in progress |
| November | 66.7% | – | – |
| December | 67.7% | – | – |
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 | 0 | – |
| February | – | 0 | – |
| March | – | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | 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 99.7% 319
- Cancelled 0.3% 1
Share of all recorded flights in the period, all legs. · Oct 31, 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 |
|---|---|---|---|---|
| STL DCA St. Louis Lambert International Airport – Ronald Reagan Washington National Airport | 1,154 | 13.6 min | 65.1% | 64 |
| SRQ MDW Sarasota Bradenton International Airport – Chicago Midway International Airport | 1,669 | 27.5 min | 53.5% | 58 |
| SRQ BNA Sarasota Bradenton International Airport – Nashville International Airport | 1,046 | 32.3 min | 59.2% | 49 |
| SAN SJC San Diego International Airport – Mineta San Jose International Airport | 671 | 12.6 min | 61.2% | 49 |
| SFO BNA San Francisco International Airport – Nashville International Airport | 3,161 | 9.0 min | 78.1% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 1 | 1 | 100.0% | 0 |
| November 2024 | 15 | 15 | 93.3% | 0 |
| December 2024 | 8 | 8 | 87.5% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| April 2025 | 20 | 20 | 60.0% | 0 |
| May 2025 | 25 | 25 | 60.0% | 0 |
| June 2025 | 16 | 16 | 56.3% | 0 |
| July 2025 | 13 | 13 | 53.9% | 0 |
| August 2025 | 5 | 5 | 40.0% | 0 |
| September 2025 | 4 | 4 | 50.0% | 0 |
| November 2025 | 28 | 27 | 66.7% | 1 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 5 | 5 | 40.0% | 0 |
| February 2026 | 7 | 7 | 57.1% | 0 |
| March 2026 | 27 | 27 | 77.8% | 0 |
| April 2026 | 30 | 30 | 60.0% | 0 |
| May 2026 | 31 | 31 | 51.6% | 0 |
| June 2026 | 26 | 26 | 57.7% | 0 |
| July 2026 | 26 | 26 | 61.5% | 0 |