Schallert finished 5th in the FIS Ski-Flying World Championships 1983 had his best individual career finish of 2nd in the normal hill in Strbske Pleso in 1985.
Schallert's best career result in ski flying competitions was achieved at the FIS Ski-Flying World Championships, where he finished fifth in 1983 and second on the normal hill in Strbske Pleso in 1985.