In July 1973, the Pirates sold Davalillo to the Oakland Athletics who were in the midst of a pennant race with the Kansas City Royals. The Athletics eventually won the American League West Division and faced the Baltimore Orioles in the 1973 American League Championship Series. Davalillo had 5 hits in 8 at-bats for a .625 batting average during the championship series, including a crucial RBI triple in the deciding Game 5. The Athletics then went on to defeat the New York Mets in the 1973 World Series. After appearing in 17 games for the Athletics in the 1974 season, Davalillo was released on May 30.