This paper reports an experimental program performed to study the flexural performance of concrete-filled double steel tubular (CFDST) members composed of the circular section. A total of seven specimens including one conventional concrete-filled steel tubular (CFST) member and a double-skin concrete-filled steel tubular (DCFST) member were tested under pure bending load. The test parameters include the influences of the thickness of the outer and inner steel tube, diameter ratio, and concrete strengths. Test results show that CFDST members failed in a ductile manner under flexural load. The performance of CFDST members is influenced by the geometry and material properties of the members. However, the thickness of the outer steel tube is found to remarkably influence the flexural performance of CFDST members.