WN4420
WN4420 (Southwest Airlines) is a multi-stop service on 17 routes, busiest St Louis to Austin. Of 323 departures recorded from October 2024 to July 2026, 68.1% left on time, according to the US BTS.
- On-time departures68.1%of 323 flights
- Average delay15.6 min
- July 202614
- Cancelled1.9%
- 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 periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 35 | 5 | ▼ 85.7% |
| February | 34 | 2 | ▼ 94.1% |
| March | 6 | – | – |
| April | 15 | 16 | ▲ 6.7% |
| May | 21 | 22 | ▲ 4.8% |
| June | 3 | 13 | ▲ 333.3% |
| July | – | 14 | – |
| August | – | – | – |
| September | – | – | – |
| October | 30 | – | in progress |
| November | 26 | – | – |
| December | 29 | – | – |
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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 82.4% | 60.0% | ▼ 27.1% |
| February | 88.2% | 100.0% | ▲ 13.3% |
| March | 50.0% | – | – |
| April | 60.0% | 68.8% | ▲ 14.6% |
| May | 66.7% | 68.2% | ▲ 2.3% |
| June | 66.7% | 30.8% | ▼ 53.8% |
| July | – | 50.0% | – |
| August | – | – | – |
| September | – | – | – |
| October | 76.7% | – | in progress |
| November | 65.4% | – | – |
| December | 31.0% | – | – |
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 periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | – | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | – | – | – |
| 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 98.1% 317
- Cancelled 1.9% 6
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL AUS St. Louis Lambert International Airport – Austin Bergstrom International Airport | 1,161 | 19.0 min | 47.5% | 59 |
| BWI PVD Baltimore/Washington International Thurgood Marshall Airport – Rhode Island T. F. Green International Airport | 526 | 5.3 min | 81.1% | 55 |
| SRQ CMH Sarasota Bradenton International Airport – John Glenn Columbus International Airport | 1,402 | 21.4 min | 66.7% | 39 |
| PVD TPA Rhode Island T. F. Green International Airport – Tampa International Airport | 1,831 | 14.0 min | 78.4% | 37 |
| STL BOS St. Louis Lambert International Airport – Boston Logan International Airport | 1,680 | 10.4 min | 77.4% | 31 |
| LAS ELP Harry Reid International Airport – El Paso International Airport | 938 | 26.3 min | 58.1% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 31 | 28 | 92.9% | 3 |
| November 2024 | 17 | 15 | 73.3% | 2 |
| December 2024 | 4 | 4 | 50.0% | 0 |
| January 2025 | 35 | 34 | 82.4% | 1 |
| February 2025 | 34 | 34 | 88.2% | 0 |
| March 2025 | 6 | 6 | 50.0% | 0 |
| April 2025 | 15 | 15 | 60.0% | 0 |
| May 2025 | 21 | 21 | 66.7% | 0 |
| June 2025 | 3 | 3 | 66.7% | 0 |
| October 2025 | 30 | 30 | 76.7% | 0 |
| November 2025 | 26 | 26 | 65.4% | 0 |
| December 2025 | 29 | 29 | 31.0% | 0 |
| January 2026 | 5 | 5 | 60.0% | 0 |
| February 2026 | 2 | 2 | 100.0% | 0 |
| April 2026 | 16 | 16 | 68.8% | 0 |
| May 2026 | 22 | 22 | 68.2% | 0 |
| June 2026 | 13 | 13 | 30.8% | 0 |
| July 2026 | 14 | 14 | 50.0% | 0 |