The fair place to meet is Phoenix, AZ — the city closest to the midpoint of Sacramento and San Antonio. From the farther side that’s about 17 hr 45 min of driving.
Recommended midpoint
Phoenix, AZ
From Sacramento
13 hr 18 min
634 mi to Phoenix
From San Antonio
17 hr 45 min
847 mi to Phoenix
Sacramento has the shorter trip; the split is off by about 4 hr 27 min. The alternatives below can even it out. Sacramento and San Antonio are about 1,456 miles apart.
Sacramento and San Antonio are about 1,456 miles apart by road. Split the difference and you arrive near Phoenix, the city closest to the halfway point between them. That puts roughly 13 hr 18 min of driving on the Sacramento side and 17 hr 45 min on the San Antonio side — the fairest single meeting point among the cities near the middle.
Over this distance most people will fly rather than drive the whole way. Phoenix still makes a fair, central place for Sacramento and San Antonio to converge, splitting the travel instead of asking one side to cross the country.
If Phoenix doesn't have what you're after, Tucson and Albuquerque are also close to the midpoint and worth a look — each keeps the drive reasonably balanced between Sacramento and San Antonio.
Phoenix is the capital and most populous city of the U.S. state of Arizona. With over 1.6 million residents at the 2020 census, Phoenix is the fifth-most populous city in the United States and the most populous state capital. Read more →
Sacramento is the capital city of the U.S. state of California. The county seat of Sacramento County, it is located at the confluence of the Sacramento and American Rivers in the Sacramento Valley. Read more →
San Antonio is a city in the U.S. state of Texas. It is the seventh-most populous city in the United States, the second-most populous city in Texas, and the second-most populous city in the Southern U.S., with a population of 1.43 million at the 2020 census. Read more →
City descriptions adapted from Wikipedia (CC BY-SA); photos via Wikimedia Commons, credited above.
Estimates use straight-line distance and typical road speeds; real drive times vary with route and traffic.