WN3509 San AntonioSAT · 10:30 St LouisSTL · 17:40
WN3509 by Southwest Airlines flies from San Antonio (SAT) to St Louis (STL) for the Wed, Sep 16 departure.
arrived at STL · 14 min early
Where the minutes go
last 4 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SAT and STL are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other San Antonio to St Louis flights today
same route · Southwest AirlinesIf WN3509 is cancelled, these are the other Southwest Airlines nonstop flights from San Antonio to St Louis on the same day, with scheduled departure times in SAT local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How WN3509 actually runs
Pro Flight Search has tracked every published board update for WN3509 across the SAT and STL boards: schedule changes, gate pushes and actual clocks. Usually lands ~12 min early. Based on 4 confirmed landings · 4/4 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how WN3509 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N8740A, N8893L, N8539V.
Board clocks recorded as SAT and STL published them.
Planning around WN3509? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — WN3509 San Antonio to St Louis on-time performance, measured from the SAT and STL airport boards.
https://proflightsearch.com/flight/WN3509
.