Ratings for Supernatural’s Season 13 Season Finale, ‘Let the Good Times Roll’ May 18, 2018 News, News Ratings for Supernatural’s May 17 episode are 0.5/2 with 1.61 million viewers. SOURCE Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window) Related