Kalantzakis served in the Hellenic Parliament, representing the Messenia constituency, from 1958 to 1967 and 1974 to 1996.
[1] He then briefly held the position of Deputy Finance Minister from April 4, 1967, until April 21, 1967, when a coup installed the Greek military junta of 1967–74.
[1] In 1974, the military junta ended, allowing for the 1974 Greek legislative election in which Kalantzakis returned to Parliament.
He was re-elected to the Hellenic Parliament in the 1977, 1981, 1985, June 1989, November 1989, 1990 and 1993 legislative elections.
[1] Kalantzakis served as the Deputy Minister of Coordination and Planning in the Konstantinos Karamanlis government from September 10, 1976 until October 21, 1977.