Season Finale: May 17th March 27, 2007 News Supernatural season finale: May 17th (Subject to change). Source: The CW 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