Coletta was also with the Boston Red Sox organization and had an impressive career in the International League.

He played for the now defunct Louisville Colonels—the AAA farm club for Boston at that time.

In mid-August 1972, about a week after turning 28 years old, Coletta was finally liberated from the (at the time) dysfunctional Red Sox organization — he was traded to the Angels for Andy Kosco — so that the Red Sox could employ a journeyman (Kosco) in their (failed) attempt to win the AL East that year.

On August 20, in a game at Tiger Stadium in Detroit, Coletta managed a rare feat by banging out two hits in the same inning (top of the fourth).

Coletta was traded along with Aurelio Monteagudo from the Angels to the Phillies for Denny Doyle at the Winter Meetings on December 6, 1973, completing a transaction from four months earlier on August 14 when Philadelphia purchased Billy Grabarkewitz's contract from California.