Acquiring information about destinations can be costly for migrants. We model informationfrictions in the rational inattention framework and obtain a closed-form expression fora migration gravity equation that we bring to the data. The model predicts that owsfrom countries with a higher cost of information or stronger priors are less responsive tovariations in economic conditions at destination, as migrants rationally get less informationbefore deciding where to move. The econometric analysis reveals systematic heterogeneityin the pro-cyclical behavior of migration flows across origins that is consistent with theexistence of information frictions.