The quantum of the tax depends on the traffic that the airport handles. So a busy airport like that of Mumbai, India, will have a higher tax than that of a smaller airport like of Indore.
Generally, International flyers pay more than the domestic flyers. The tax could also depend on the size of the plane that the passenger is taking and also the time of the day. Flying during peak hours could attract a higher tax.
Many times, majority of the tax is the landing tax, paid by the airline to land at the specific airport and the cost is passed on to the flyer.