He played Tier II Junior "A" for the Humboldt Broncos from 1979 to 1981. He then joined the major junior Saskatoon Blades for two seasons, scoring 62 goals and 99 assists in the 1982-83 season. The New York Islanders chose him 126th overall in the 1982 NHL Entry Draft.
Kortko turned pro with the Indianapolis Checkers in 1983-84. Over the next three seasons, he split his time between the Islanders and the Springfield Indians. He played in 79 NHL games over this span, scoring 7 goals and 17 assists.
He retired in 1992.