WN3817
WN3817 (Southwest Airlines) is a multi-stop service on 18 routes, busiest St Louis to Phoenix. Of 400 departures recorded from October 2024 to July 2026, 65.3% left on time, according to the US BTS.
- On-time departures65.3%of 400 flights
- Average delay21.8 min
- July 202617▼ 45.2%vs July 2025
- Cancelled0.0%
- 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 | 17 | 31 | ▲ 82.4% |
| February | 9 | 28 | ▲ 211.1% |
| March | 14 | 9 | ▼ 35.7% |
| April | 23 | 25 | ▲ 8.7% |
| May | 26 | 31 | ▲ 19.2% |
| June | 30 | 18 | ▼ 40.0% |
| July | 31 | 17 | ▼ 45.2% |
| August | 4 | – | – |
| September | – | – | – |
| October | 29 | – | in progress |
| November | 21 | – | – |
| December | 19 | – | – |
| Year to date (Jan–Jul) | 150 | 159 | ▲ 6.0% |
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 | 76.5% | 77.4% | ▲ 1.2% |
| February | 55.6% | 67.9% | ▲ 22.1% |
| March | 78.6% | 44.4% | ▼ 43.4% |
| April | 78.3% | 52.0% | ▼ 33.6% |
| May | 57.7% | 54.8% | ▼ 4.9% |
| June | 63.3% | 61.1% | ▼ 3.5% |
| July | 35.5% | 58.8% | ▲ 65.8% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | 86.2% | – | in progress |
| November | 85.7% | – | – |
| December | 63.2% | – | – |
| Year-to-date average (Jan–Jul) | 63.6% | 59.5% | ▼ 6.5% |
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 | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 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 100.0% 400
- Cancelled 0.0% 0
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 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 PHX St. Louis Lambert International Airport – Phoenix Sky Harbor International Airport | 2,026 | 16.7 min | 70.7% | 58 |
| DAL BNA Dallas Love Field – Nashville International Airport | 1,000 | 30.4 min | 53.5% | 58 |
| STL DAL St. Louis Lambert International Airport – Dallas Love Field | 878 | 16.1 min | 72.0% | 50 |
| DEN AUS Denver International Airport – Austin Bergstrom International Airport | 1,249 | 51.8 min | 39.5% | 43 |
| MKE LAS General Mitchell International Airport – Harry Reid International Airport | 2,447 | 9.3 min | 73.5% | 34 |
| BWI CHS Baltimore/Washington International Thurgood Marshall Airport – Charleston International Airport | 761 | 3.4 min | 86.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 76.5% | 0 |
| November 2024 | 1 | 1 | 100.0% | 0 |
| January 2025 | 17 | 17 | 76.5% | 0 |
| February 2025 | 9 | 9 | 55.6% | 0 |
| March 2025 | 14 | 14 | 78.6% | 0 |
| April 2025 | 23 | 23 | 78.3% | 0 |
| May 2025 | 26 | 26 | 57.7% | 0 |
| June 2025 | 30 | 30 | 63.3% | 0 |
| July 2025 | 31 | 31 | 35.5% | 0 |
| August 2025 | 4 | 4 | 50.0% | 0 |
| October 2025 | 29 | 29 | 86.2% | 0 |
| November 2025 | 21 | 21 | 85.7% | 0 |
| December 2025 | 19 | 19 | 63.2% | 0 |
| January 2026 | 31 | 31 | 77.4% | 0 |
| February 2026 | 28 | 28 | 67.9% | 0 |
| March 2026 | 9 | 9 | 44.4% | 0 |
| April 2026 | 25 | 25 | 52.0% | 0 |
| May 2026 | 31 | 31 | 54.8% | 0 |
| June 2026 | 18 | 18 | 61.1% | 0 |
| July 2026 | 17 | 17 | 58.8% | 0 |