The　preparation　of　biologically　relevant　spirodienones　from　arenol　derivatives　is　typically　performed　in　batch　using　superstoichiometric　oxidants.　Herein,　we　have　developed　an　electrochemical　dearomative　spirocyclization　in　flow,　featuring　the　use　of　electrons　as　the　clean　oxidant　in　a　minimum　amount　of　electrolytes　or　even　the　absence　of　electrolytes　to　afford　diverse　spirodienones　in　a　short　reaction　time.　©　2022　The　Royal　Society　of　Chemistry.