Found a better routing, gonna book it for the week after --
NW0336 LAX-DTW
NW3450 DTW-LEX
NW3459 LEX-DTW
NW1515 DTW-MDW
NW0615 MDW-MSP
NW0321 MSP-LAX
Still one day (Leave LAX at 2 AM, return at 11 PM), and it's $160. At 5509 status miles, 2.9 cpm. And since it's only one day, I save myself the extra day of parking and a hotel. Good way to kill a lazy summer day.