Vienna is served by Vienna International Airport, located 18 km (11 mi) southeast of the city centre next to the town of Schwechat. It is one of Europe’s biggest airports and serves as the hub for Austrian Airlines and Niki. It features a dense network of European destinations as well as long-haul flights to the rest of the world. In total there are more than 70(!) airlines touching down at the Vienna International Airport.
This means that you will have no trouble finding reliable and fairly priced tickets to the Austrian capital.