In this study, the characteristics of the plasma jet launched from a single-wide tube (diameter of up to 30 mm) are investigated under different operating conditions and electrode arrangements in order to derive empirical scaling equations, which can be used as guidelines for enlarging the jet diameter. The effect of these selected parameters on the jet formation was pronounced at wider tubes, due to the significant effects of the tube diameter (D) on the electric field as well as the formation and loss of plasma species. For instance, no jet was launched from tubes with D > 10 mm at frequencies less than 5 kHz, wherein a higher reduction in the plasma species. Moreover, the discharge had a chaotic behaviour in wide tubes, and the discharge stability was greatly improved by reducing the electrode gap (g); however, the jet was dismissed at a considerable smaller gap (g < 30 mm). Therefore, an optimum gap was found to launch a stable plasma jet, and its value increased linearly with D, particularly at D > 10 mm. Furthermore, a threshold velocity and power were required to launch a stable jet, and their values also increased linearly with increasing the tube diameter. Interestingly, it is found that there is an effective residence time for the gas in the discharge gap, wherein a stable jet can be launched from a tube regardless of its diameter. Finally, the role of the investigated parameters was analysed to formulate scaling equations for designing wide plasma jet devices from a single tube.