The fair place to meet is Denver, CO — the city closest to the midpoint of Boise and Kansas City. From the farther side that’s about 13 hr 21 min of driving.
Recommended midpoint
Denver, CO
From Boise
13 hr 21 min
637 mi to Denver
From Kansas City
11 hr 41 min
557 mi to Denver
Kansas City has the shorter trip; the split is off by about 1 hr 40 min. The alternatives below can even it out. Boise and Kansas City are about 1,160 miles apart.
Boise and Kansas City are about 1,160 miles apart by road. Split the difference and you arrive near Denver, the city closest to the halfway point between them. That puts roughly 13 hr 21 min of driving on the Boise side and 11 hr 41 min on the Kansas City 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. Denver still makes a fair, central place for Boise and Kansas City to converge, splitting the travel instead of asking one side to cross the country.
If Denver doesn't have what you're after, Salt Lake City and Albuquerque are also close to the midpoint and worth a look — each keeps the drive reasonably balanced between Boise and Kansas City.
Denver is the capital and most populous city of the U.S. state of Colorado. Officially a consolidated city and county, it is located in the South Platte River valley on the western edge of the High Plains, and is just east of the Front Range of the Rocky… Read more →
Boise is the capital and most populous city in the U.S. state of Idaho. It is the county seat of Ada County. The population of the city was 235,685 at the 2020 census. Read more →
Kansas City, abbreviated KC or KCMO, is the largest city in the U.S. state of Missouri by both population and area. It is located on the Missouri River at its confluence with the Kansas River, within Jackson, Clay, Platte and Cass counties. 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.