Edso - what city are you from?
40 from the AZ line to Kingman can be boring.
Highway 93 from Kingman to the entrance to Lake Mead is like driving on railroad tracks; definitely needs to be paved.
Side note if you are doing it again; try Mr D's diner in Kingman (right off 40 as you connect to 93). Quirky 50's style diner, food is good.
When I am working in Phoenix we drive from Phoenix to Vegas. We take multiple trips per year & we can round trip it on a tank of gas. So the costs of flying, airport parking & renting a car can pile up. It is a pretty boring drive though They are working on widening the road north of Wickenburg & repaving other parts.
We find Phoenix Sky Harbor Airport to be a modern clean airport with easy access to the airport & getting around the terminals is easy.