The fair place to meet is Albuquerque, NM — the city closest to the midpoint of Dallas and Las Vegas. From the farther side that’s about 12 hr 18 min of driving.
Recommended midpoint
Albuquerque, NM
From Dallas
12 hr 18 min
587 mi to Albuquerque
From Las Vegas
10 hr 7 min
482 mi to Albuquerque
Las Vegas has the shorter trip; the split is off by about 2 hr 11 min. The alternatives below can even it out. Dallas and Las Vegas are about 1,069 miles apart.
Dallas and Las Vegas are about 1,069 miles apart by road. Split the difference and you arrive near Albuquerque, the city closest to the halfway point between them. That puts roughly 12 hr 18 min of driving on the Dallas side and 10 hr 7 min on the Las Vegas 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. Albuquerque still makes a fair, central place for Dallas and Las Vegas to converge, splitting the travel instead of asking one side to cross the country.
If Albuquerque doesn't have what you're after, El Paso and Tucson are also close to the midpoint and worth a look — each keeps the drive reasonably balanced between Dallas and Las Vegas.
Albuquerque is the most populous city in the U.S. state of New Mexico. Founded in 1706 as La Villa de Alburquerque by Santa Fe de Nuevo México governor Francisco Cuervo y Valdés, and named in honor of Francisco Fernández de la Cueva, 10th Duke of Alburquerque… Read more →
Dallas is a city in the U.S. state of Texas. Located in the state's northern region, it is the ninth-most populous city in the United States and third-most populous city in Texas, with a population of 1.3 million at the 2020 census. Read more →
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 →
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.