Prague public transport is based on three metro (underground) lines (A, B, C), tram network (lines 1–26 by day, 51–59 by night) and city buses (lines 100–291 by day, 501–514 by night). Bus lines 301–499 provide connection to the places out of the capital. The daily public transportation (including metro lines) operates approx. from 5 a.m. to midnight.
The tickets are of two types: “change” and “no-change” ones. The “change” ticket (CZK 20) is valid for 75 minutes after stamping (for 90 minutes on Saturdays, Sundays and public holidays and from 8 p.m. to 5 a.m. on weekdays); unlimited changes are allowed within the validity period. The “no-change” tickets (CZK 14) are valid for one ride not longer than 5 stations (but not longer than 30 minutes) in metro and for 20 minutes in the surface transportation (bus, tram). Tickets for public transport can be purchased at the automatic vending machines at the stations, in kiosks or in the offices of the Prague Public Transit Company (usually located at the entrances to the metro stations and at the Ruzyně Airport as well).
More information can be found at http://www.dpp.cz/en/.
The public transportation is reliable and well arranged but rather crowded in the rush hours. Please take care of your belongings, beware of pickpockets.
Those PDF documents are created by Dopravní podnik hl. m. Prahy, a.s.