The average firefighter salary at Ontario was $191,784 , which is 1 percent lower than the average salary for this job in California, but 88 percent higher than the national average for this job . Firefighter salaries at Ontario typically range from $153,193 to $242,199 (25th to 75th percentile). The highest reported firefighter salary was $299,268. There are 88 employees at Ontario with the job title firefighter.