In this paper, we present approximate solutions for the Advection equation by finite differences method. In this method we convert the nonlinear partial differential equation into a system of nonlinear equations by some finite differences methods. Then this system was solved by Newton's method. And we made a program implementing this algorithm and we checked the program using some examples, which have exact solutions, then we evaluate our results. As a conclusion we found that this method gives accurate results for Advection equation.