WN4238
WN4238 (Southwest Airlines) is a multi-stop service on 10 routes, busiest St Louis to San Diego. Of 327 departures recorded from October 2024 to July 2026, 81.3% left on time, according to the US BTS.
- On-time departures81.3%of 327 flights
- Average delay10.1 min
- July 202630▲ 650.0%vs July 2025
- Cancelled0.3%
- Legs flown under this number10
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 | 23 | 5 | ▼ 78.3% |
| February | 21 | – | – |
| March | 4 | – | – |
| April | – | 24 | – |
| May | – | 31 | – |
| June | 4 | 30 | ▲ 650.0% |
| July | 4 | 30 | ▲ 650.0% |
| August | 24 | – | – |
| September | 26 | – | – |
| October | 1 | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
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 | 95.5% | 80.0% | ▼ 16.2% |
| February | 95.2% | – | – |
| March | 75.0% | – | – |
| April | – | 75.0% | – |
| May | – | 77.4% | – |
| June | 50.0% | 80.0% | ▲ 60.0% |
| July | 75.0% | 86.7% | ▲ 15.6% |
| August | 91.7% | – | – |
| September | 80.8% | – | – |
| October | 100.0% | – | in progress |
| November | 64.3% | – | – |
| December | 61.3% | – | – |
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 | – | – |
| March | 0 | – | – |
| April | – | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.7% 326
- Cancelled 0.3% 1
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL SAN St. Louis Lambert International Airport – San Diego International Airport | 2,501 | 21.7 min | 64.4% | 59 |
| SJC HNL Mineta San Jose International Airport – Daniel K. Inouye International Airport | 3,886 | 14.9 min | 75.9% | 58 |
| LGB DEN Long Beach International Airport – Denver International Airport | 1,373 | 8.8 min | 84.2% | 57 |
| MDW DCA Chicago Midway International Airport – Ronald Reagan Washington National Airport | 964 | 4.6 min | 86.0% | 50 |
| DAL PIT Dallas Love Field – Pittsburgh International Airport | 1,704 | 0.7 min | 93.8% | 49 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 88.9% | 0 |
| November 2024 | 18 | 18 | 100.0% | 0 |
| December 2024 | 14 | 14 | 92.9% | 0 |
| January 2025 | 23 | 22 | 95.5% | 1 |
| February 2025 | 21 | 21 | 95.2% | 0 |
| March 2025 | 4 | 4 | 75.0% | 0 |
| June 2025 | 4 | 4 | 50.0% | 0 |
| July 2025 | 4 | 4 | 75.0% | 0 |
| August 2025 | 24 | 24 | 91.7% | 0 |
| September 2025 | 26 | 26 | 80.8% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 28 | 28 | 64.3% | 0 |
| December 2025 | 31 | 31 | 61.3% | 0 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| April 2026 | 24 | 24 | 75.0% | 0 |
| May 2026 | 31 | 31 | 77.4% | 0 |
| June 2026 | 30 | 30 | 80.0% | 0 |
| July 2026 | 30 | 30 | 86.7% | 0 |