On what date did The Legend of Korra's finale first release?

The Legend of Korra’s finale first released on December 19, 2014.

The episode was the conclusion of Book Four: Balance, the series’ 13-episode final season. Unlike the show’s earlier Nickelodeon broadcast run, Book Four was initially distributed online through Nick.com and other digital outlets, beginning on October 3, 2014.

The finale’s release date is sometimes confused with October 3, which was the premiere date for the season, or July 25, 2014, when Book Three: Change ended. The series as a whole ran for 52 episodes across four books, from April 14, 2012, through December 19, 2014.

Book Four’s episodes were released weekly online before later television broadcasts. The finale’s date therefore marks the show’s first release, not the later home-video dates for the complete series.