In this paper, a scalable variable-length packet switch using multistage interconnection network is proposed. The architecture consists of multiple non-buffer switch elements, interconnected with perfect shuffle pattern and with ring topology. Each input port is connected to a switch element in a different stage, and packets applied from these ports are routed to their destined output ports based on principle of deflection routing. The proposed switch has following features; (1) To achieve certain packet loss rate, required number of stage to achieve certain packet loss rate is less than the same type of switches due to efficient use of switch elements. (2) Packet loss rate is almost unchanged regardless of traffic patterns. In performance evaluation, two types of non-uniform traffic are given and it is shown that the switch can achieve lower packet loss rate than existing deflection routing based switch.