A single aircraft was used in Estonia. Two RWD 13, sent to the World's Fair, were sold after the outbreak of war in 1939 and used in the United States (N20651 and N20652), where their structure was modified by Lt. Joseph Malejki. Three (or one) aircraft were sold to Yemen. Several RWD 13 were evacuated to Latvia and they were probably later seized by the Soviets.