The average aide salary at Winfield Elem. was $33,687 , which is 46 percent higher than the average salary for this job in Missouri, and 4 percent higher than the national average for this job . Aide salaries at Winfield Elem. typically range from $31,350 to $39,050 (25th to 75th percentile). The highest reported aide salary was $43,850. There are 5 employees at Winfield Elem. with the job title aide.