The lift-off phase during the space launch generates an extreme acoustic environment around the rocket fairing which must be considered for the qualification of large satellites. The sound waves, whose main source is the plume of gases coming from the rocket engine exhaust, travel through the fairing and impact the satellite, generating large vibrations in components with high surface to mass ratio. Dedicated models of the acoustic sources such as Distributed Source Method can be used to characterize the sound radiation from the jet of gasses. When it comes to modelling the spatial sound environments around the fairing, numerical approaches such as FEM or BEM are not well suited due to the large geometry of the problem and the need for extensive mesh refinements at high frequencies. In this context, geometrical acoustic methods such as ray acoustics provide a solution for full frequency simulations in very large geometries by assuming that the sound propagates along rays. Using this framework, this work focuses on the lift-off environment at the Vega launch pad and provides predictions of the sound pressure levels and directivity patterns around the payload fairing. Relevant considerations about how to replicate such conditions in laboratory tests are also discussed.