A dispensing closure for viscous fluids contains a closure body, a closure lid and a living hinge structure hingeably connecting the closure lid to the closure body. The closure body includes an upper deck, a skirt configured and arranged to mount to a product container, and a flow conduit extending through the upper deck to provide a flow path from an interior of the closure to an exterior of the closure. The flow conduit includes an entrance orifice and an exit orifice, and an inner wall extending between the entrance orifice and the exit orifice. To provide the desired flow effect, the inner wall includes at least one flow inhibitor structure, such as helically threaded flights extending at least partially inwardly from the inner wall into the flow path to define an unobstructed central flow path and a partially obstructed peripheral flow path.