The invention relates to an ultrasonic flowmeter (10) and to a method for measuring flow by using ultrasound, comprising at least two ultrasonic transducers (12, 14), which are placed inside the flowchannel (16) while being offset in the direction of flow and which serve to emit and receive ultrasonic wave packets so that ultrasound transit times from one of the ultrasonic transducers (12, 14) tothe other and vice versa can be determined in an electronics component (24). The ultrasonic flowmeter also comprises a pressure sensor (26), which is assigned to the flow channel (16) and which serves to determine the pressure inside the flow channel (16). By precisely measuring the inflowing air in the induction of a motor vehicle combustion engine, measured values can be determined for an engine control that is as precise as possible.