In the title compound, C(15)H(10)ClFO(2)S, the O atom and the methyl group of the methyl-sulfinyl substituent are located on opposite sides of the plane through the benzofuran fragment. The 4-fluoro-phenyl ring is rotated out of the benzofuran plane, making a dihedral angle of 25.99 (4)°. The crystal structure is stabilized by a non-classical inter-molecular C-H⋯O hydrogen bond and a Cl⋯O halogen bond [3.244 (1) Å].