All this interview scheduling is really driving me nuts and confusing me.

I checked out flights on Priceline, and I could get a round trip ticket from ND for $672, but I could add a rental car and the total price would then only be $450. ???
😕 Only problem with that was it didn't let you pick the departure times.
My main problem is that I'm flying home from AZ Saturday night, then I need to leave for Des Moines on Sunday for a Monday interview. Then I really should be back for a Tuesday class.
Going to Des Moines is so much more expensive than going to Phoenix, even though it closer. Would I be really crazy trying to drive the 10 hr trip home on Monday after the interview and then going to my class on Tuesday at 9am? Or should I work harder at finding some way to fly? ($672!
😱).