In this work, we investigated the pressure-dependence of the ionic conductivity of common solid fluoride ion conductors. For BaSnF4, PbSnF4, and Ba0.6La0.4F2.4 the same behavior of improvement linear increase of ionic conductivity up upon dropping from 2 GPa to a threshold pressure, followed by a nonlinear drop in the ionic conductivity was observed, while only a linear increase was observed for La0.9Ba0.1F2.9. The activation volumes for all electrolytes were calculated from the slope of the linear regime, showing that of all measured materials Ba0.6La0.4F2.4 displays the lowest activation volume.