I'm seeing economy class fares from Detroit to Rome and Venice for under 450 for the months of June, July, August,September,October, and even November. Fare class is 0 so you will only earn 50% miles but its a great fare from DTW to Italy and even Europe in general. You really wont get much better than this!
Heck if you wanted to leave tommorrow you could book for 450 and return Monday!
https://matrix.itasoftware.com/#view...OaNgko08ld100O
https://www.google.com/flights/#flt=....292591353;t:e