This paper investigates a new fixed-time blended control for agile missiles with a novel multi-source control mode consisting of heterogeneous actuators. To reduce the turning radius and promote maneuvering capability, a new multi-source control mode, including the flexible mechanism control system (FCS), Reaction-jet Control System (RCS), and aerodynamic control is introduced. Based on the proposed nonsingular terminal sliding mode manifold, a fixed-time anti-saturation controller is employed to track the attitude command and an auxiliary system is developed to settle the input saturation problem. To counteract the chattering phenomenon, this paper constructs a fixed-time disturbance observer to compensate for lumped disturbances actively. Using the dynamic programming method, a dynamic control allocator is designed to map the total virtual control command to each actuator. Numerical simulations are presented to demonstrate the utility of the proposed scheme.