FLIXBUS

This German bus company extends its services to cowboy country, offering low-cost trips between major Texas cities, including San Antonio, Dallas, Houston and Austin. A trip between San Antonio and Houston can start from 30 US$, and to Dallas around 35 US$. So it's really cheap and a bit more comfortable than the Greyhound buses. The prices are not that different. But don't expect great luxury either. The trips can be longer than expected and not very comfortable.