The "Glee" goodbye episode is defined by both the episode entitled "Goodbye" and the series finale, or final episodes, entitled "Dreams Come True," which are both available to view online from Amazon, Hulu, iTunes and Vudu. The "Glee" television series aired from May 2009 until March 20, 2015. Full episodes from all six seasons are available online.
Some of the online video sites mentioned that feature full episodes of "Glee" including the goodbye episode and series finale may require a membership, fee or purchase. Amazon Prime members can view full episodes for free or purchase the individual episode without a membership for $2.99 as of October 2015.