San Marcos Municipal Airport (KHYI) is located just outside San Marcos off of Highway 21.
Use this airport diagram for navigation on the airport during your stay.
The following list contains links to bussinesses located on the airport:
Gafford Aero 512.396.3323
Berry Aviation (FBO)
Southwest Texas Aviation (Mooney, Cirrus, Diamond Service Center)
Texas State Aviation (Flight School)
Tejas Aero Services (Aircraft Painting and Interior)