Ultrasonic flowmeter with at least one measuring tube, with at least one first ultrasonic transducer and one second ultrasonic transducer, wherein the first ultrasonic transducer is designed as an ultrasonic transmitter and/or as an ultrasonic receiver and wherein the second ultrasonic transducer is designed as an ultrasonic transmitter and/or as an ultrasonic receiver, wherein the ultrasonic transducers (3, 4) are arranged offset on the measuring tube, viewed in the direction of flow, such that, during operation, the respective transmitter transmits an ultrasonic signal in the direction of flow or against the direction of flow, and that the receiver receives the ultrasonic signal transmitted by the transmitter after at least three reflections, wherein at least three reflecting surfaces (9, 10) are provided, and wherein the course of the ultrasonic signal between the ultrasonic transducers (3, 4) defines a signal path, wherein the signal path has at least one first signal path section and at least one second signal path section, wherein the first signal path section has more than two sub-sections (6.1, 6.2, 6.3), and wherein the first signal path section, in axial plan view of the measuring tube cross-section, traverses the flow cross-section substantially circularly or, in axial plan view of the measuring tube cross-section, substantially forms a polygon, wherein the second signal path section comprises more than two partial sections (7. 1, 7.2, 7.3) and wherein the second signal path section, in axial plan view of the measuring tube cross-section, passes through the flow cross-section in a substantially circular manner or, in axial plan view of the measuring tube cross-section, substantially forms a polygon, wherein the number of sub-sections (6.1, 6.2, 6.3) of the first signal path section corresponds to the number of sub-sections (7.1, 7.2, 7.3) of the second signal path section and wherein the signal path in the first signal path section has a first direction of rotation in axial plan view and that the signal path in the second signal path section has a second direction of rotation in axial plan view, wherein the second direction of rotation is opposite the first direction of rotation characterized in that the first ultrasonic transducer and the second ultrasonic transducer and the reflection surface between the first signal path section and the second signal path section are arranged in the axial direction of the measuring tube in axial plan view of the measuring tube cross section at the same point of the measuring tube circumference or slightly offset. wherein the signal path has at least one first signal path section and at least one second signal path section, wherein the first signal path section has more than two sub-sections (6.1, 6.2, 6.3), and wherein the first signal path section, in axial plan view of the measuring tube cross-section, traverses the flow cross-section substantially circularly or, in axial plan view of the measuring tube cross-section, substantially forms a polygon, wherein the second signal path section comprises more than two partial sections (7. 1, 7.2, 7.3) and wherein the second signal path section, in axial plan view of the measuring tube cross-section, passes through the flow cross-section in a substantially circular manner or, in axial plan view of the measuring tube cross-section, substantially forms a polygon, wherein the number of sub-sections (6.1, 6.2, 6.3) of the first signal path section corresponds to the number of sub-sections (7.1, 7.2, 7.3) of the second signal path section and wherein the signal path in the first signal path section has a first direction of rotation in axial plan view and that the signal path in the second signal path section has a second direction of rotation in axial plan view, wherein the second direction of rotation is opposite the first direction of rotation characterized in that the first ultrasonic transducer and the second ultrasonic transducer and the reflection surface between the first signal path section and the second signal path section are arranged in the axial direction of the measuring tube in axial plan view of the measuring tube cross section at the same point of the measuring tube circumference or slightly offset.