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In the title mol­ecule, C 16 H 15 FN 4 O, the dihedral angle between the fluoro-substituted benzene ring and the pyrimidinone ring is 52.34 (7)°, while the dihedral angle between the fused benzene ring and the pyrimidinone ring is 3.30 (6)°. An intra­molecular N—H⋯N hydrogen bond may, in part, influence the conformation of the mol­ecule. In the crystal structure, inter­molecular N—H⋯N hydrogen bonds and weak C—H⋯π(arene) inter­actions link pairs of mol­ecules into centrosymmetric dimers.

3-(2-Aminoethyl)-2-(4-fluoroanilino)quinazolin-4(3H)-one