May 10: The Sun waived Brina Chaney and Brianne Stepherson.
May 4: The Sun waived Texlin Quinney, Jamila Wideman, and Isabel Stubbs.
April 26: The Sun signed Brina Chaney, Katie MacFarlane, Le'Coe Willingham, Jennifer Derevjanik, Courtney Mix, and Texlin Quinney.
April 20: The Sun waived Adrienne Johnson.
April 19: The Sun waived Jamila Wideman.
April 16: The Sun signed Isabel Stubbs.
April 9: The Sun signed Wendy Palmer-Daniel, Brianne Stepherson, Anna Zimerle, and Anastasia Kostaki.
March 25: The Sun acquired Asjha Jones from the Washington Mystics. The Washington Mystics acquired Tamicha Jackson from the Phoenix Mercury. The Phoenix Mercury acquired the 8th pick in the 2004 WNBA Draft from the Sun.
January 28: The Sun traded Shannon Johnson and their 21st and 34th picks in the 2004 WNBA Draft to the Silver Stars in exchange for San Antonio's 4th, 16th, 29th picks in the 2004 WNBA Draft.
January 5: The Sun traded the eighth pick in the 2004 WNBA Dispersal Draft to the Houston Comets in exchange for a second-round pick in the 2004 collegiate draft.
In the first round of the Eastern Conference Playoffs, the Sun had to face the Washington Mystics. Since the Sun had the better record, the series would be played with game 1 at Washington, game 2 at Connecticut, and game 3 (if needed) at Connecticut. The Sun lost the first game, but won the next two to advance to the next round. In the second round of the Eastern Conference Playoffs, the Sun had to face the New York Liberty. The Sun and the Liberty had identical records and each team had won two of the four meetings against each other in the regular season. The Sun attained home-court advantage however, because they beat the Liberty by more than the Liberty beat them. The series would be played with game 1 at New York and games 2 and 3 (if needed) at Connecticut. The Sun swept the Liberty and game 3 was not needed. The Sun advanced to the WNBA Finals. The team would be facing off against the Seattle Storm. The Storm had the better record so the series would be played with game 1 at Connecticut, and games 2 and 3 (if needed) at Seattle. This was the last year the league played the finals in a best-of-three setup. The Storm beat the Sun 2 games to 1 to win the WNBA Finals.