It is 355 miles according to Google Maps.
cedar city
Grand Junction, CO Cedar City, UT.
cedar city
Halfway is the western part of the Denver metropolitan area. I'd break that trip up into thirds.
You would generally travel east from Carson City Nevada to get to Denver Colorado.
The address of the Cedar City Public Library is: 303 North 100 East, Cedar City, 84720 2610
Denver
The biggest city between Denver and Kansas City is Kansas City, Missouri. As of the most recent estimates, it has a population of over 490,000, making it significantly larger than Denver, which has a population of around 715,000. However, if considering the metropolitan areas, Kansas City also has a larger metropolitan population compared to the Denver-Aurora-Lakewood metropolitan area.
Amarillo, TX
There arent really any 'major' cities between Salt Lake City and Las Vegas, but the larger cities would be Provo, Utah; Beaver, Utah; Cedar City, Utah; St. George, Utah; and Mesquite, Nevada. These are all right along Interstate 15.
Liberal, KS