That season, Flater scored ten goals in fifteen games with the Dynamos.
Flater made the move with the team and spent the next two seasons in Minnesota.
However, his scoring pace dropped to one goal in twelve games in 1977 and he moved to the Oakland Stompers for the start of the 1978 season.
In twenty-two games with the Timbers, he scored seven goals as Portland went to the NASL semifinals.
However, Flater suffered a major knee injury which put him out of the 1979 season.