We established a method for generating an ultrasound beam that propagates along a narrow, isolated curved path and is accompanied by an arc-shaped airflow, and experimentally confirmed the actual generation of such a beam. The method employs a two-dimensional orthogonal phased array of ultrasound transducers, whose individual columns correspond to a line segment in a given beam trajectory. Each column of transducers yields a “ring” in which acoustic energy is concentrated. A cluster of these ultrasound rings arranged at sufficiently small spatial intervals interfere with adjacent rings, consequently forming a fine curved path of propagating ultrasound accompanied by an ultrasound-driven air flow. The positions of these rings can be electronically controlled and so can the position of the resulting beam path. We obtained isolated sharp arc-shaped airflows propagating over nearly 1 m in open space. Such airflows have never been reported and are extremely difficult to generate by the superposition of ordinary jet-driven airflows. Our achievement will lead to the ability to generate airflows along an arbitrarily designed three-dimensional arc-shaped path. This technique will be utilized in such unprecedented applications as midair transportation of gaseous substance or control of heat in the air while circumventing obstacles, which are intuitive, yet hard to achieve by other methods.