The average fee for a Diploma in Aeronautical Engineering generally ranges from INR 1.5 to 3 lakhs for the entire course. However, this can vary significantly depending on factors such as the reputation of the institution, the location, and the quality of facilities and faculty. Government institutions may offer lower fees than private ones, and some colleges also provide scholarships or financial aid, which can help reduce the overall cost. It’s advisable to research and compare different institutions to find the one that fits both your budget and educational needs.