The invention proceeds from a seat fastening for fastening a seat, in particular an aircraft seat, to a fastening rail, with at least one base body, which is provided at least for a vertical fastening in the fastening rail, and with at least one horizontal-fastening element, which is slidable with respect to the base body at least between a locking position and an unlocking position.It is proposed that the seat fastening comprises at least one locking device, which is provided to fixate the at least one horizontal-fastening element in the unlocking position.