There are currently two terminals at San Antonio International Airport — Terminal A and Terminal B.
The terminals used to be named Terminal 1 (now Terminal A) and Terminal 2 (now demolished). The airport's old Terminal 2 was demolished in 2011 after the new and existing Terminal B was built. When Terminal A opened, the existing Terminal 1 was renamed Terminal A, as to give consistency to the terminal names.
There are plans to build a third terminal, Terminal C, in the airport's master expansion plan.
Terminal A
Opened in 1975, Terminal A, formerly Terminal 1, is the older and larger terminal of the two terminals at the airport. More than half of the airlines that fly to San Antonio International operate out of this terminal.
Terminal B
Terminal B opened in 2010 and is the smaller terminal of the two terminals at San Antonio International. Terminal B is home to both (and all) of the airport's lounges.