Hybrid synthetic-natural polymer matrix composites (HSNPMCs) are becoming more important and attractive for many structural applications. Partial replacement of synthetic fibres (SFs) with natural fibres (NFs) are an interesting subject for engineers considering the environmental awareness and cost reduction. In this study, the glass/jute fibre-reinforced polyester composites were fabricated with different jute-to-glass content ratios while keeping the same fibre weight fractions that equal to about 18% for all composites. The mechanical tests like tensile, flexural, and absorbed energy (Charpy impact test) were conducted for glass, jute, and hybrid composite specimens and compared among each other. Free vibration analysis was carried out to these composite specimens to find their fundamental natural frequencies and damping ratios. The results indicated that hybrid composites with a stacking sequence of G-J-G exhibited promising tensile and flexural properties and good absorbed energy. Concerning the free vibrational characteristics, the G-J-J-G composite type offered the highest fundamental frequency with good dampening characteristics. Higher benefits could be obtained when using specific mechanical properties and vibrational characteristics of hybrid composites when compared with glass composites. It can be suggested that the incorporation of jute fibres into the glass fibre composite in hybrid structure, as presented in this study, can improve the dynamic characteristics of the composites with encouraging mechanical performance.