 At the international level, Stewart first played for Canada in a 1956 all-star match against FC Lokomotiv Moscow.After representing Canada in FIFA World Cup Qualifiers in 1957, he was part of Canada's side during a 1960 tour of the Soviet Union and Britain.His senior lacrosse career spanned between 1949 and 1961 - playing in 152 regular season games and 59 playoff games at the Senior 'A' level in British Columbia.