The average private school tuition in Illinois is $10,418 per year (2026-27).
The private elementary school average tuition cost is $9,544 per year and the private high school average is $14,315 per year.
The private school with the lowest tuition cost is San Miguel School, with a tuition of $1,050.
Quick Facts (26-27)
- # IL Schools Ranked: 494
- Top 20 Range (Tuition): $1,050–$2,350
- IL School Avg.: $10,418
- National School Avg.: $11,232









