WN3950
WN3950 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Washington to St Louis. Of 451 departures recorded from October 2024 to July 2026, 69.3% left on time, according to the US BTS.
- On-time departures69.3%of 451 flights
- Average delay17.6 min
- July 202630
- Cancelled1.8%
- Legs flown under this number19
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 28 | 28 | 0.0% |
| February | 40 | 35 | ▼ 12.5% |
| March | 40 | 32 | ▼ 20.0% |
| April | 24 | 6 | ▼ 75.0% |
| May | 23 | – | – |
| June | 2 | 27 | ▲ 1,250.0% |
| July | – | 30 | – |
| August | 12 | – | – |
| September | 13 | – | – |
| October | 22 | – | in progress |
| November | 16 | – | – |
| December | 6 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 80.0% | 96.4% | ▲ 20.5% |
| February | 37.5% | 100.0% | ▲ 166.7% |
| March | 57.5% | 35.5% | ▼ 38.3% |
| April | 66.7% | 66.7% | 0.0% |
| May | 91.3% | – | – |
| June | 50.0% | 53.9% | ▲ 7.7% |
| July | – | 53.3% | – |
| August | 100.0% | – | – |
| September | 100.0% | – | – |
| October | 77.3% | – | in progress |
| November | 64.3% | – | – |
| December | 60.0% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 1 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 1 | – | – |
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 98.2% 443
- Cancelled 1.8% 8
Share of all recorded flights in the period, all legs. · Oct 14, 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 |
|---|---|---|---|---|
| DCA STL Ronald Reagan Washington National Airport – St. Louis Lambert International Airport | 1,154 | 24.5 min | 65.1% | 109 |
| STL MCO St. Louis Lambert International Airport – Orlando International Airport | 1,420 | 24.8 min | 53.6% | 57 |
| SAN LAS San Diego International Airport – Harry Reid International Airport | 417 | -3.5 min | 100.0% | 50 |
| OAK SAN Oakland San Francisco Bay Airport – San Diego International Airport | 718 | 13.1 min | 72.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 13 | 13 | 76.9% | 0 |
| November 2024 | 26 | 26 | 76.9% | 0 |
| December 2024 | 28 | 28 | 71.4% | 0 |
| January 2025 | 28 | 25 | 80.0% | 3 |
| February 2025 | 40 | 40 | 37.5% | 0 |
| March 2025 | 40 | 40 | 57.5% | 0 |
| April 2025 | 24 | 24 | 66.7% | 0 |
| May 2025 | 23 | 23 | 91.3% | 0 |
| June 2025 | 2 | 2 | 50.0% | 0 |
| August 2025 | 12 | 12 | 100.0% | 0 |
| September 2025 | 13 | 13 | 100.0% | 0 |
| October 2025 | 22 | 22 | 77.3% | 0 |
| November 2025 | 16 | 14 | 64.3% | 2 |
| December 2025 | 6 | 5 | 60.0% | 1 |
| January 2026 | 28 | 28 | 96.4% | 0 |
| February 2026 | 35 | 35 | 100.0% | 0 |
| March 2026 | 32 | 31 | 35.5% | 1 |
| April 2026 | 6 | 6 | 66.7% | 0 |
| June 2026 | 27 | 26 | 53.9% | 1 |
| July 2026 | 30 | 30 | 53.3% | 0 |