In this paper, we investigate the thermoelectric transport coefficients namely the Seebeck coefficient, the electrical conductivity, the electronic thermal conductivity and the lattice thermal conductivity using first-principles calculations in density functional theory. We also estimate the figure-of-merit for both intrinsic as well as extrinsic low-buckled monolayer silicene. Using Electron-Phonon Wannier function, we calculate the average scattering time in the reduced Brillouin zone as a function of temperature. The scattering time of electrons in the conduction band is found to be slightly higher than that of holes in the valence band. Also, the out-of-plane acoustic phonon modes scatter more strongly than the in-pane acoustic modes and hence contributes less in lattice thermal conductivity. We observe that the lattice thermal conductivity of monolayer intrinsic silicene comes out of the order of 9.2 Wm−1K−1 and the figure-of-merit in n-type material is almost twice to that of the p-type at around 1200 K. We compare the results obtained with HSE06 hybrid functional and PBE functional and find that there is a significant improvement in the values of those transport coefficients calculated using HSE06.