Vienna has a good public transport system www.wien.gv.at/..., which includes commuter rail, underground, trams (trolleys), and buses. The subway system is very efficient and will take you to within a few minutes walk of anywhere you are likely to want to visit.
Within Vienna itself, you can get a single trip ticket for any of these for €1.80 (€0.9 for children and dogs), a 24-hour ticket for €5.70, or a three-day pass for €13.60. A 48-hour version is available for €10. A one-person Wochenkarte (a week ticket covering all means of transport) stands at €14 for lines within zone 100 (all of Vienna), but is fixed for the Monday to Sunday period. A one month pass is €49.50 and is valid from the first day of the month through the second day of the following month.
Note that children up to 19 years need NOT to buy a ticket on Sundays, holidays and during Austrian school vacations as long as they attend an Austrian school.
You can buy all kinds of tickets at machines or from counters in or near S-Bahn and U-Bahn stations and in the small shops selling tobacco and newspapers (Tabak). Ticket machines accept Visa/Mastercard credit and debit cards, as well as cash. In trams and buses, you can only buy single tickets, which are more expensive (€2.20 full fare, €1.10 for children). Stamp your ticket at the start of its first use (there are stamping machines on the buses and trams and near the entrances to the stations). You can use one ticket to go in one direction on as many lines as you like, for as long as it takes you to get there. You have to buy another ticket if you stop and get out or if you want to go back in the direction from which you came. Payment is by the honour system. Normally, you don't have to show the ticket or stamp it again when you board, but occasionally inspectors check for valid tickets. If you don't have one, its an instant €70 fine (plus the fare you were supposed to have paid).
If you're staying for a few days and hope to do lots of sightseeing or shopping, the Vienna Card (Wien Karte) www.wienkarte.at/... is a good deal. It costs €18.50 and is good for 72 hours of unlimited public transit within Vienna. The card also gets you discounts (typically €1 or €2 at the major museums and art galleries) to many attractions and shops. You can buy it at the airport, hotels, and underground stops. Other options for longer stays or multiple parties include weekly and monthly passes, and the eight person day card (i.e. good for one person for eight days, two people for four days, or four people for two days).
The eight person day card (8-Tage-Karte) for €28.80 gives eight non-consecutive days of unlimited travel on U-Bahn and trams until 1AM (just after midnight). There are eight blank lines on the Karte (ticket). Fold the ticket to the desired blank line starting with blank line numbered one. The ticket can be shared by people traveling together. Punch one line per person per day. Trams and buses have a punch machine inside. The S-Bahn and U-Bahn have a punch machine at the entrance. You can travel to the Flughafen (airport) on the S-Bahn using this ticket with an additional €1.80 Außenzonen (outer zone) ticket.
Rail trips to the outskirts of Vienna may require additional fare. For example, a trip to or from the airport on the S7 line is a two-zone ride, requiring either a €3.60 advance purchase or a single zone (€1.80) ticket supplement to one of the timed-use Vienna tickets.
Because Vienna is one of those cities that never sleeps, a dense network of night buses is available for those who have a rather nocturnal approach to tourism. Since 2002, regular tickets may be used on these buses. Most terminate at "Kärntner Ring, Oper", which allows for easy interchange. Intervals are usually 30 minutes, with some busier lines (especially on Friday and Saturday night) going every 15 minutes. On summer nights, you can also use the S-Bahn between Flughafen Wien and Floridsdorf, which has a 60 minute interval.
There are five U-Bahn (subway) lines – U1, U2, U3, U4 and U6. The tickets are bought from vending machines on the stations. Unlike Paris for example, Vienna's U-bahn has no turnstiles, so it is technically possible to enter the system without a ticket. However, you may want to think twice about that as the trains are often patrolled by ticket inspectors not wearing any kind of uniforms. A one-way ticket costs €1.80 and a ticket valid for 24 hours €5.70 but there are many other kinds of tickets www.wienerlinien.at/... as well.
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