A spaceport was a location where spaceships took off and landed.
Some of the spaceports visited by the Doctor and his companions were Elvis the King Spaceport on New Memphis (PROSE: Judgement of the Judoon), Tantane Spaceport on Tantane (AUDIO: Spaceport Fear), Amber Station (PROSE: Briefly Noted), Dalek City (PROSE: War of the Daleks), Cornucopia (COMIC: The Cornucopia Caper, Hunters of the Burning Stone), as well as those on Ekthelios (COMIC: Attack of the GateBots!) and Hera (PROSE: The Squire's Crystal).