Onion (Allium cepa) is a famous spice commonly grown all over the world and consumed in various forms. Onion is a source of various biologically active compounds, such as sulphur compounds and flavonoids, derivatives with a large variety of pharmacological activities including anticancer, antidiabetic, antimicrobial, cardiovascular, antioxidant effects. Onion oil is an important source of sulphur compounds. In this study, the binding efficiency of 11 identified compounds from Allium cepa oil with some selected proteins from Dengue virus through in silico method was done. By virtual screening and docking results, we have found that hexadecanoic acid has the most convenient binding activity for the seven selected proteins.