The
Vienna
public transport system works on the honor system. You need to buy a ticket
in advance. It is not worth the risk of being caught without one - fines are very
steep and could ruin a perfectly pleasant vacation.
Probably the best ticket to buy while in Vienna is the '8-Tage-Karte' -
buy
it online!. It costs 28.80 EUR and gives you 8 days of unlimited rides on
the public transport system within city limits. Let's say you and your loved
one are in Vienna for 4 days - you buy one 8-Tage-Karte and each day you stamp
two (one for each of you) coupons.
You must validate one stripe of this multi-ride ticket per person and day
prior to using public transport. Each strip of the 8-day ticket is valid on
the day of validation from 0.00 until 1.00 of the following day. The number
of stripes validated must equal the number of persons using the pass during
that day. The pass is good for unlimited riding in Zone 100 on the day of
validation. Instructions for use:
Fold back validated stripes.
Insert folded ticket in ticket machine (see arrow);
validation is indicated by a short signal.
Here are
other
ticket versions for shorter or longer stays.
For further reading I highly suggest '
The
Vienna Metro' an unofficial site about the U-Bahn!