WN438
WN438 (Southwest Airlines) is a multi-stop service on 35 routes, busiest St Louis to Kansas City. Of 693 departures recorded from October 2024 to July 2026, 80.3% left on time, according to the US BTS.
- On-time departures80.3%of 693 flights
- Average delay10.4 min
- July 202630▲ 66.7%vs July 2025
- Cancelled0.6%
- Legs flown under this number35
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 34 | 30 | ▼ 11.8% |
| February | 32 | 28 | ▼ 12.5% |
| March | 32 | 47 | ▲ 46.9% |
| April | 34 | 34 | 0.0% |
| May | 40 | 31 | ▼ 22.5% |
| June | 18 | 30 | ▲ 66.7% |
| July | 18 | 30 | ▲ 66.7% |
| August | 38 | – | – |
| September | 39 | – | – |
| October | 32 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 208 | 230 | ▲ 10.6% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 93.9% | 93.3% | ▼ 0.6% |
| February | 87.5% | 100.0% | ▲ 14.3% |
| March | 96.7% | 55.3% | ▼ 42.8% |
| April | 61.8% | 67.7% | ▲ 9.5% |
| May | 57.5% | 74.2% | ▲ 29.0% |
| June | 83.3% | 86.7% | ▲ 4.0% |
| July | 50.0% | 83.3% | ▲ 66.7% |
| August | 76.3% | – | – |
| September | 84.6% | – | – |
| October | 96.9% | – | in progress |
| November | 89.7% | – | – |
| December | 87.1% | – | – |
| Year-to-date average (Jan–Jul) | 75.8% | 80.1% | ▲ 5.6% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 2 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.4% 689
- Cancelled 0.6% 4
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL MCI St. Louis Lambert International Airport – Kansas City International Airport | 380 | 0.7 min | 93.5% | 110 |
| BHM MCO Birmingham-Shuttlesworth International Airport – Orlando International Airport | 771 | 1.3 min | 96.6% | 58 |
| AUS SAN Austin Bergstrom International Airport – San Diego International Airport | 1,871 | 13.3 min | 77.2% | 57 |
| BWI ATL Baltimore/Washington International Thurgood Marshall Airport – Hartsfield Jackson Atlanta International Airport | 928 | 3.7 min | 88.9% | 46 |
| DEN STL Denver International Airport – St. Louis Lambert International Airport | 1,236 | 7.9 min | 82.5% | 40 |
| PVD MCO Rhode Island T. F. Green International Airport – Orlando International Airport | 1,728 | 19.9 min | 69.2% | 39 |
| LAS STL Harry Reid International Airport – St. Louis Lambert International Airport | 2,202 | 2.7 min | 90.6% | 33 |
| CMH RSW John Glenn Columbus International Airport – Southwest Florida International Airport | 1,501 | -3.2 min | 97.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 32 | 32 | 100.0% | 0 |
| December 2024 | 33 | 33 | 72.7% | 0 |
| January 2025 | 34 | 33 | 93.9% | 1 |
| February 2025 | 32 | 32 | 87.5% | 0 |
| March 2025 | 32 | 30 | 96.7% | 2 |
| April 2025 | 34 | 34 | 61.8% | 0 |
| May 2025 | 40 | 40 | 57.5% | 0 |
| June 2025 | 18 | 18 | 83.3% | 0 |
| July 2025 | 18 | 18 | 50.0% | 0 |
| August 2025 | 38 | 38 | 76.3% | 0 |
| September 2025 | 39 | 39 | 84.6% | 0 |
| October 2025 | 32 | 32 | 96.9% | 0 |
| November 2025 | 30 | 29 | 89.7% | 1 |
| December 2025 | 31 | 31 | 87.1% | 0 |
| January 2026 | 30 | 30 | 93.3% | 0 |
| February 2026 | 28 | 28 | 100.0% | 0 |
| March 2026 | 47 | 47 | 55.3% | 0 |
| April 2026 | 34 | 34 | 67.7% | 0 |
| May 2026 | 31 | 31 | 74.2% | 0 |
| June 2026 | 30 | 30 | 86.7% | 0 |
| July 2026 | 30 | 30 | 83.3% | 0 |