The fair place to meet is Las Vegas, NV — the city closest to the midpoint of Sacramento and Tucson. From the farther side that’s about 8 hr 6 min of driving.
Recommended midpoint
Las Vegas, NV
From Sacramento
8 hr 6 min
387 mi to Las Vegas
From Tucson
7 hr 35 min
362 mi to Las Vegas
Tucson has the shorter trip; the split is off by about 31 min. The alternatives below can even it out. Sacramento and Tucson are about 737 miles apart.
Sacramento and Tucson are about 737 miles apart by road. Split the difference and you arrive near Las Vegas, the city closest to the halfway point between them. That puts roughly 8 hr 6 min of driving on the Sacramento side and 7 hr 35 min on the Tucson side — the fairest single meeting point among the cities near the middle.
That's a half-day drive from each side, so Las Vegas suits an overnight or a weekend rather than a quick coffee — long enough to want a reason to stay, short enough to drive.
If Las Vegas doesn't have what you're after, Los Angeles and San Diego are also close to the midpoint and worth a look — each keeps the drive reasonably balanced between Sacramento and Tucson.
Las Vegas, colloquially shortened to Vegas, is the most populous city in the U.S. state of Nevada and the county seat of Clark County. It is the 24th-most populous city in the United States, with 641,903 residents at the 2020 census. 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 →
Tucson is the county seat of and the most populated city in Pima County, Arizona, United States. 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.