WN4438
WN4438 (Southwest Airlines) is a multi-stop service on 16 routes, busiest Atlanta to San Antonio. Of 384 departures recorded from October 2024 to July 2026, 69.0% left on time, according to the US BTS.
- On-time departures69.0%of 384 flights
- Average delay14.8 min
- July 202623▼ 14.8%vs July 2025
- Cancelled1.8%
- Legs flown under this number16
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 | 11 | 4 | ▼ 63.6% |
| February | 15 | 1 | ▼ 93.3% |
| March | 2 | 26 | ▲ 1,200.0% |
| April | 23 | 22 | ▼ 4.3% |
| May | 30 | 23 | ▼ 23.3% |
| June | 26 | 20 | ▼ 23.1% |
| July | 27 | 23 | ▼ 14.8% |
| August | 3 | – | – |
| September | – | – | – |
| October | 1 | – | in progress |
| November | 26 | – | – |
| December | 26 | – | – |
| Year to date (Jan–Jul) | 134 | 119 | ▼ 11.2% |
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 | 90.0% | 100.0% | ▲ 11.1% |
| February | 73.3% | 100.0% | ▲ 36.4% |
| March | 50.0% | 84.6% | ▲ 69.2% |
| April | 60.9% | 40.9% | ▼ 32.8% |
| May | 56.7% | 43.5% | ▼ 23.3% |
| June | 84.6% | 55.0% | ▼ 35.0% |
| July | 70.4% | 52.6% | ▼ 25.2% |
| August | 33.3% | – | – |
| September | – | – | – |
| October | 100.0% | – | in progress |
| November | 92.0% | – | – |
| December | 64.0% | – | – |
| Year-to-date average (Jan–Jul) | 69.4% | 68.1% | ▼ 1.9% |
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 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 4 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 4 | ▲ 300.0% |
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 98.2% 377
- Cancelled 1.8% 7
Share of all recorded flights in the period, all legs. · Oct 15, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ATL SAT Hartsfield Jackson Atlanta International Airport – San Antonio International Airport | 1,405 | 18.1 min | 73.3% | 76 |
| SAN RNO San Diego International Airport – Reno Tahoe International Airport | 787 | 13.2 min | 59.7% | 57 |
| STL MDW St. Louis Lambert International Airport – Chicago Midway International Airport | 404 | 7.4 min | 79.3% | 55 |
| SAT LAS San Antonio International Airport – Harry Reid International Airport | 1,718 | 15.3 min | 75.0% | 52 |
| BWI JAX Baltimore/Washington International Thurgood Marshall Airport – Jacksonville International Airport | 1,068 | 27.1 min | 52.6% | 42 |
| STL BOS St. Louis Lambert International Airport – Boston Logan International Airport | 1,680 | 20.2 min | 46.2% | 39 |
| SJC BWI Mineta San Jose International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,915 | 8.0 min | 75.0% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 7 | 7 | 100.0% | 0 |
| November 2024 | 35 | 35 | 91.4% | 0 |
| December 2024 | 33 | 33 | 60.6% | 0 |
| January 2025 | 11 | 10 | 90.0% | 1 |
| February 2025 | 15 | 15 | 73.3% | 0 |
| March 2025 | 2 | 2 | 50.0% | 0 |
| April 2025 | 23 | 23 | 60.9% | 0 |
| May 2025 | 30 | 30 | 56.7% | 0 |
| June 2025 | 26 | 26 | 84.6% | 0 |
| July 2025 | 27 | 27 | 70.4% | 0 |
| August 2025 | 3 | 3 | 33.3% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 26 | 25 | 92.0% | 1 |
| December 2025 | 26 | 25 | 64.0% | 1 |
| January 2026 | 4 | 4 | 100.0% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 26 | 26 | 84.6% | 0 |
| April 2026 | 22 | 22 | 40.9% | 0 |
| May 2026 | 23 | 23 | 43.5% | 0 |
| June 2026 | 20 | 20 | 55.0% | 0 |
| July 2026 | 23 | 19 | 52.6% | 4 |