One of the biggest influences on the PPL licence cost is the type of flying school you choose. Government or state run schools tend to have lower charges while private academies with newer aircraft better facilities and brand reputation often charge more. So if you pick a premium academy expect the cost to rise accordingly.
The cost also rises with the type of aircraft used and the number of flying hours needed. Older simpler aircraft cost less to rent and maintain whereas modern or more complex planes (with advanced avionics) increase maintenance and fuel costs which is passed on to you. Moreover if you require more flying hours to meet proficiency or due to delays the PPL licence cost goes up.
Teaching quality and infrastructure matter. Highly experienced instructors and well equipped simulators classrooms and pilots' facilities usually come at a premium. Choosing a school with top instructors and high standards will raise the cost but may shorten your course duration and improve training quality.
Where you train affects cost. Schools in busy metro airports or regions with higher airspace fee fuel cost or airport charges will tend to have higher PPL licence cost. Also if you need accommodation food travel and living expenses because you're training far from home these add to your budget.
Beyond the headline fees there are many additional costs. Medical tests (like the required Class 2 or Class 1 certificate) written exams simulator hours equipment (books headset uniform) insurance conversion fees if training abroad all these can bump up the total. These hidden expenses mean your final PPL licence cost may be more than simply course fee.
Finally how quickly you complete the course impacts cost. Delays due to weather aircraft/instructor availability or if you need extra hours to reach the required competency will all increase your PPL licence cost. A student who progresses smoothly will keep costs down.