Seed dispersal is one of the ecosystem services provided by bats, however there are few studies that value this service in a context of ecosystem transformation. This work characterized the bat assembly and its diet in an Oil Palm plantation in the municipality of Cumaral (Meta, Colombia). An approach to the economic valuation of seed dispersal was made by the method of replacement costs in order to recover forest coverage. 393 bats of 18 species were captured, and differences in order 1 diversity and evenness were found between forest and Oil palm plantation due to increased abundances of generalist species in the plantation. Nine frugivorous bats registered 171 diets, seed species richness was found to be greater in the plantation than the forest, possibly due to the use of plantations as fly ways between habitat patches. Cecropia peltata presented the greatest plant importance index followed up by Vismia macrophylla. The species complex of the genus Carollia and Artibeus planirostris were the most importat dispersers due to their high abundances and the large variety of dispersed seeds. According to the replacement costs, the potential value of seed dispersal varies between $10.404.460, 00 and $12.673.700, 00 Colombian pesos. The use of the oil palm plantation by bats can maintain regulation services of ecosystems in the foothills of Colombian llanos. The economic valuation highlights the importance of seed dispersal as an ecosystem service and the importance of the biodiversity components associated to it.