WN3998
WN3998 (Southwest Airlines) is a multi-stop service on 18 routes, busiest St Louis to Austin. Of 379 departures recorded from October 2024 to July 2026, 75.9% left on time, according to the US BTS.
- On-time departures75.9%of 379 flights
- Average delay12.8 min
- July 202631▼ 3.1%vs July 2025
- Cancelled1.3%
- 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 | 4 | 1 | ▼ 75.0% |
| February | 10 | – | – |
| March | 18 | 27 | ▲ 50.0% |
| April | 4 | 22 | ▲ 450.0% |
| May | 1 | 23 | ▲ 2,200.0% |
| June | 26 | 28 | ▲ 7.7% |
| July | 32 | 31 | ▼ 3.1% |
| August | 27 | – | – |
| September | 26 | – | – |
| October | 43 | – | in progress |
| November | 4 | – | – |
| 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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 0.0% | ▼ 100.0% |
| February | 100.0% | – | – |
| March | 61.1% | 52.0% | ▼ 14.9% |
| April | 75.0% | 66.7% | ▼ 11.1% |
| May | 100.0% | 43.5% | ▼ 56.5% |
| June | 69.2% | 100.0% | ▲ 44.4% |
| July | 56.3% | 100.0% | ▲ 77.8% |
| August | 77.8% | – | – |
| September | 92.3% | – | – |
| October | 72.1% | – | in progress |
| November | 100.0% | – | – |
| December | 0.0% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | – | – |
| March | 0 | 2 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | 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 98.7% 374
- Cancelled 1.3% 5
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL AUS St. Louis Lambert International Airport – Austin Bergstrom International Airport | 1,161 | 24.3 min | 60.7% | 61 |
| TPA AUS Tampa International Airport – Austin Bergstrom International Airport | 1,490 | -4.1 min | 100.0% | 58 |
| DCA STL Ronald Reagan Washington National Airport – St. Louis Lambert International Airport | 1,154 | 5.5 min | 88.0% | 50 |
| RDU MDW Raleigh-Durham International Airport – Chicago Midway International Airport | 1,016 | 26.2 min | 53.9% | 40 |
| MDW SAT Chicago Midway International Airport – San Antonio International Airport | 1,668 | 34.4 min | 54.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 88.2% | 0 |
| November 2024 | 11 | 11 | 100.0% | 0 |
| December 2024 | 22 | 22 | 86.4% | 0 |
| January 2025 | 4 | 3 | 100.0% | 1 |
| February 2025 | 10 | 10 | 100.0% | 0 |
| March 2025 | 18 | 18 | 61.1% | 0 |
| April 2025 | 4 | 4 | 75.0% | 0 |
| May 2025 | 1 | 1 | 100.0% | 0 |
| June 2025 | 26 | 26 | 69.2% | 0 |
| July 2025 | 32 | 32 | 56.3% | 0 |
| August 2025 | 27 | 27 | 77.8% | 0 |
| September 2025 | 26 | 26 | 92.3% | 0 |
| October 2025 | 43 | 43 | 72.1% | 0 |
| November 2025 | 4 | 3 | 100.0% | 1 |
| December 2025 | 2 | 2 | 0.0% | 0 |
| January 2026 | 1 | 1 | 0.0% | 0 |
| March 2026 | 27 | 25 | 52.0% | 2 |
| April 2026 | 22 | 21 | 66.7% | 1 |
| May 2026 | 23 | 23 | 43.5% | 0 |
| June 2026 | 28 | 28 | 100.0% | 0 |
| July 2026 | 31 | 31 | 100.0% | 0 |