Airbag cushion assemblies for aspirating ambient air and related assemblies. Some embodiments may comprise an aspirating airbag cushion assembly comprising an airbag cushion, which may be configured to deploy from a housing or the like. The assembly may further comprise one or more inflation conduits configured to deliver inflation gas into the airbag cushion through a plurality of inflation ports. Each inflation conduit may comprise one or more features to improve aspiration efficiency, such as expanded distal portions and/or angled features to redirect inflation gases in a manner to improve the efficiency of the inflation gas to aspirate ambient air into the cushion.