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If you click on the price and then on "Preisdetails" (price details), you will see that the quoted price is only for the train ticket from Wien Mitte-LandstraΓe to the airport and that you need a separate ticket for the subway.
If you only use means of transport available with a VOR ticket (some of the trains and buses to the airport have their own tariff), you will need a VOR ticket for 2 tariff zones, costing you 4.40β¬.