From its launch in 1999, SmackDown broadcast on Thursday nights, but as of September 9, 2005, the show moved to Friday nights. The show originally debuted in the United States on the UPN television network on August 26, 1999, but after the merger of UPN and the WB, SmackDown began airing on The CW in 2006. The show remained on the CW network for two years until it was announced that it would move to MyNetworkTV in October 2008. SmackDown is set to move from MyNetworkTV to Syfy in October 2010.
Due to time differences, SmackDown premieres a few hours earlier in Ireland and United Kingdom and a day earlier in Australia, India and Philippines than the United States.