An air-conditioning control system includes an air-conditioning device mounted in a host vehicle, a determination unit mounted in the host vehicle or a server and configured to determine whether a boarding position at which a boarding event in which an occupant boards the host vehicle occurs is a point with a predetermined attribute, and a control unit mounted in the host vehicle and configured to control the air-conditioning device based on a determination result from the determination unit. The control unit sets a ventilation capacity of the air-conditioning device to be greater when the determination unit determines that the boarding position is a point with the predetermined attribute than when the determination unit does not determine that the boarding position is a point with the predetermined attribute.