At Kingman, which is the junction with I-40.
Phoenix, Arizona
When the U. S. is on Daylight Saving Time, from the 2nd Sunday of March to the 1st Sunday of November, there is no time difference between Phoenix and Las Vegas. When the U. S. is on Standard Time, Phoenix is 1 hr. ahead of Las Vegas. 4 AM PST = 5 AM PDT = 5 AM MST
Phoenix, Arizona is about 287 miles southeast of Las Vegas, Nevada.
It is only a 5 hour drive, but Kingman is a possibility.
It is 285.57 miles according to MapQuest.
It is 340.30 miles according to MapQuest.
Phoenix, Arizona
ABOUT FIVE HOURS
On US-93.
It is a 5 hour drive.
I'd say Las Vegas, NV, as far as major towns.
It is about 30 miles from the Hoover Dam border between Arizona and Nevada to drive to Las Vegas.