The title compound, C(15)H(11)FN(4)OS, is almost planar, the dihedral angle between the aromatic ring systems being 5.00 (13)°. The conformation is stabilized by intra-molecular N-H⋯N and N-H⋯O hydrogen bonds, which generate S(5) and S(6) rings, respectively. N-H⋯F and C-H⋯S inter-actions also occur. In the crystal, inversion dimers linked by pairs of N-H⋯O hydrogen bonds occur, generating R(2) (2)(8) loops.