Having spent nearly a decade in the San Antonio/Austin area, no. I'd say only recently have San Antonio and Austin even felt connected. But Dallas and Houston are completely different worlds in my mind. It's nearly 5 hours from San Antonio to Dallas, with not much interesting in between.
Yeah but it’s a 77 minute flight. That’s one thing that always catches me off guard when I’m in an airport in Texas: the number of intra-state flights is massive. With pre-check and valet parking, you really can make it from door to door in about 2hrs.