Flight
We live in south Austin, and while we are closer to the Austin airport (30 minutes), we are only about 1.5 hours from San Antonio, so feel free to comparison shop for your flights! As an FYI...Houston and Dallas are both 3 hours away in case you want to fly into one of those and drive (Note: if you do, let me know. I can recommend cool restaurants/activities along the drive from either location).
Hotel
Special pricing for wedding block: https://www.marriott.com/event-reservations/reservation-link.mi?id=1592922890745&key=GRP&app=resvlink. If you have trouble, call the hotel and ask for the Rouse/Williams Wedding rate.
Rental Car
Depending on what's going on in Austin, rental cars can be expensive. If they are, Uber, Lift, and RideAustin are always readily available.