The average aide salary at Alton High was $31,471 , which is 36 percent higher than the average salary for this job in Missouri, but 3 percent lower than the national average for this job . Aide salaries at Alton High typically range from $14,854 to $37,406 (25th to 75th percentile). The highest reported aide salary was $73,107. There are 8 employees at Alton High with the job title aide.