Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 3979 · St Louis (STL) → San Antonio (SAT)
Sold by Southwest. Still flying: 47 of the last 56 days (Mon–Sat).
Arrives on time65%within 15 minutes, of 49 flights
Cancelled0.0%of scheduled flights
An hour or more late8%of flights that operated
When late, on average57 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport.
- Leaves STL
- 22:15
- Arrives SAT
- 00:25
- Flight time
- 2h 05m
- Days flown, last 8 weeks
- 47 of 56
Each square is a day, Sat Jun 6 to Fri Jul 31, two weeks per row (each column is the same weekday); filled = flew.
How late it arrives
Share of flights that operated arriving more than this late.
Horizontal: minutes late at arrival (0 to 3 hours). Vertical: share of flights later than that.
Its hour at STL
All flights leaving St Louis (STL) at 10–11 pm, wherever they’re going: 54% left within 15 minutes and 1.0% were cancelled (1,022 flights in the year). Other Southwest flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.