For those who come by plane, every half an hour between 5 am and 12 am, 7 days a week, there are trains from the airport to the Main Station. The journey takes around 16 minutes. The ticket costs 12 PLN (~3€). The new train station is located near the passenger terminal.
In addition to that, there are three regular bus lines (208, 209, 252 and 902) from the airport to the city centre. We suggest to take the line 252 (timetable) since it stops at the Muzeum Narodowe stop.
One can also take a taxi which should cost around 60 PLN (~15€). If you take a taxi ask for the price before you enter it. We advice to use only the registered taxi companies and to ask for a receipt.

More information can be found on Kraków Airport Page.

For those who come by train we suggest to take the bus number 179 and leave at the stop called AGH / UR (stop number 5) which is the nearest stop from the Auditorium Maximum.
The taxi fare should not exceed 30 PLN (less than 10€).

The city transport system in Kraków includes buses and trams.
There are two zones of transportation. Zone I "City Cracow" covers almost whole Kraków excluding its suburbs e.g. the airport. All tram lines. Zone II covers suburbs of Kraków (e.g. the airport). All buses with numbers starting with 2 go to the second zone but when one uses such a bus within the zone I, one does not need to cancel the ticket for zone II. All night bus and trams lines within the zone I start with 6 and within the zone II start with 9.
Ticket tariff, remember to validate your ticket after boarding the vehicle (only once in case of the short-term tickets).