Season 1 (2006–07)

Notes:

• "Swag" was originally scheduled to be aired as the 4th episode, but was moved to 11th by the network. The change resulted in a number of continuity problems, which were "fixed" by making most of the episode a flashback and adding scenes with Betty telling Christina the bulk of the story. In Italy, Denmark, Spain, India and the Philippines, the episode is retained as the 4th episode.^[1]
• On the season 1 DVD box set, "Swag" is listed as episode 4, without the scenes of Betty talking to Christina in a flashback. Other noticeable changes on the DVD were the reversed order of the show's episode chronology: "The Box and the Bunny", which is the second episode, is listed as the third episode, having swapped places with "Queens for a Day". However, "The Box and the Bunny" should be the second episode.

Season 2 (2007–08)

Notes:

• Season 2 was originally slated to have a total of 24 episodes, but due to the Writers Guild of America strike, it had 18 episodes with the last five written and produced following the strike's end.^{[citation needed]}

Season 3 (2008–09)

Notes:

• ABC placed Ugly Betty on a temporary hiatus after the March 19, 2009 episode to air Samantha Who? and In the Motherhood in the 8-9PM E/P slot, but returned it after the shows complete their runs.^[2] Ugly Betty returned on April 30, 2009 to finish its 3rd season, ending with a 2-hour season finale airing on May 21, 2009.^[3]

Season 4 (2009–10)

Notes:

• Episodes 66–74 aired on Fridays (October 16, 2009 – December 11, 2009).
• Episodes 75–85 aired on Wednesdays (January 6, 2010 – April 14, 2010).
• Season 4 was originally slated to have a total of 22 episodes but was reduced to 20 episodes.

Season 1

Season 2

Season 2 initially included 6 episodes but an Amazon-exclusive 7th episode was subsequently added.

Season 3