nwa.com gives you 4/1 outbound PVD-DTW-MSP-PHX and a return PHX-MSP-PVD for $152 ai. I suspect OP itin includes CO flight with CLE in the city pairs. Beware of CO because on lower fares you only get 50 percent EQM and no EQS. That makes the cpm significantly more from MR perspective if you are looking for qualifying miles and segments.