This article integrates the empirical findings of 80 studies of international tourism demand. This was achieved using meta-analytical techniques — a field of statistics that has evolved in recent years and puts much more scientific rigor into integrative studies. Individual empirical studies produce useful results, but generalizations depend on the synthesis of these results across studies. The article shows that artifactual effects, and substantive and methodological inter-study differences account for much of the variation in findings. It discusses those results concerning the effect of country-of-origin and country-of-destination on the estimated determinants of international tourism demand.