A356 aluminum casting alloys are used in fabrication of aircraft components where high strength is a requirement. The requirement of parts with light weight and high strength is constantly increasing. Aluminium matrix composites are considered to be new generation potential materials for many engineering applications. A356 alloy reinforced with Al2O3, SiC and Gr particulates with varied wt% was used to fabricate the hybrid composites by using squeeze casting method. The prepared composites were investigated for its structural and mechanical properties such as density, microstructural characterization, hardness, tensile strength, yield strength and elongation%. The composite density increased with increase in wt% of reinforcement. Microstructural examination revealed uniform distribution of reinforcement and XRD identified the presence of A356 matrix alloy and reinforcement Al2O3, SiC and Gr. A356/3wt%Al2O3/3wt%SiC/3wt%Gr exhibited superior hardness and tensile strength value of 119 BHN and 315 MPa. Gr reinforcement known for its soft characteristics compromised the addition of Al2O3 and SiC reinforcement towards the improved mechanical properties. The results obtained encouraged that A356 composite showed 40% improved hardness and 35%. The improved hardness and tensile strength than squeeze cast pure A356 aluminum alloy clearly shows it remains a clear substitute for aircraft components with high strength. © 2020, Springer Nature B.V.