The cheapest way to the airport. Nothing listed is quicker.
REX7 train
REX7 · OeBB, on a VOR ticketPickup, hours & luggage
Boards at. Wien Hauptbahnhof, platforms 3 to 12 — the REX train towards Schwechat and the airport
An ordinary VOR single covering the airport and the Vienna core zone. The airport sits outside the core zone, so a Vienna city ticket will not do — and the two halves bought separately (EUR 2.30 plus EUR 2.40) come to less than the through fare and are not valid for it.
Luggage. A regional train, with racks at the carriage ends.
Hours. Every 30 minutes, taking 22 to 23 minutes.