Season 0 of Happy Endings premiered on February 29, 2012.

Season 1 of Happy Endings premiered on April 13, 2011.

The first season of Happy Endings, an American television series, premiered on April 13, 2011 and concluded on August 24 of the same year. ABC officially picked up the show on May 18, 2010, where it premiered on April as a midseason replacement, with a one-hour premiere of two back-to-back episodes starting at 9:30 pm ET/PT. In the weeks that followed, the show continued to air back-to-back episodes that began airing at 10:00 pm ET/PT.

Season 2 of Happy Endings premiered on September 28, 2011.

The second season of Happy Endings, an American television series. ABC officially renewed Happy Endings for a second season on May 13, 2011. It was later announced it would move to a new time-slot on Wednesdays at 9:30pm, as a lead-in to new series, Revenge. It premiered on September 28, 2011.

On November 3, 2011, ABC picked up the show for a full 22-episode second season. However the 21st episode to air was labeled as the season finale by ABC as they "needed" to premiere Don't Trust the B---- in Apartment 23 on April 11, 2012. Despite the episode officially being held back for the third season, the 22nd episode aired on E4 in the UK on May 17, 2012, and other international markets, as part of the second season.

Although the season was not officially released on DVD until October 23, 2012, the DVD was included in a release that contains the first two seasons of the show that was released on August 14, 2012.

Season 3 of Happy Endings premiered on October 23, 2012.

The third and final season of Happy Endings, an American television series. ABC officially renewed Happy Endings for a third and final season on May 11, 2012. It was also announced it would move to a new time-slot on Tuesdays at 9:00pm, as a lead-in to Don't Trust the B---- in Apartment 23. The season premiered on October 23, 2012. On February 13, 2013, ABC announced that, starting March 29, 2013, the series would move to Fridays at 8:00-9:00 p.m ET/PT with back-to-back original episodes. The series finale aired on May 3, 2013.

ABC's scheduling of Happy Endings's third and final season was labeled the "Worst TV Strategy" of the 2012-13 television season.