Austria has six airports that are generally used for passenger traffic.
[1] The airports are ranked by the total passengers, with the annual and rank change since the prior year.
Vienna International Airport always ranks first with tens of millions of passengers per year.
This is typically followed by Salzburg Airport with around a million or two passengers per year, then Innsbruck Airport (except in 2021), Graz Airport, with Linz Airport getting a few hundred thousand passengers, and Klagenfurt Airport being ranked last.