San Antonio is around the same size as Phoenix.

Phoenix is approximately 1,342 sq km, while San Antonio (map shows its 401 named neighbourhoods; the area covers the whole city) is approximately 1,292 sq km, making San Antonio 96.27% the size of Phoenix.
Tip: This to-scale comparison of Phoenix vs. San Antonio uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.