The Airport Minibus, which leaves every 15-30 minutes from the airport, will take you to any destination within Budapest for 2300 HUF (if you know your departure day you can purchase return ticket for 3900 HUF). Seat reservation is not necessary, but you can reserve a seat in advance by phone: 296 8555 (Info-Desk at Terminal 2).

There is also bus No. 93, which is cheaper. When exiting the airport, turn to the right from Terminal A, or left from Terminal B, to find the bus stop that says BKV Plusz Reptér busz.

The bus stops at the airport every 15 minutes, from 04:55 to 23:20, and goes to Kőbánya-Kispest metro station (blue line).