The average teacher salary at Fairfax High was $19,863 , which is 65 percent lower than the average salary for this job in Missouri, and 70 percent lower than the national average for this job . Teacher salaries at Fairfax High typically range from $14,788 to $25,179 (25th to 75th percentile). The highest reported teacher salary was $31,400. There are 12 employees at Fairfax High with the job title teacher.