After arrival to Budapest at Liszt Ferenc International Airport in Budapest, you should take official airport taxis. For any taxi ride within Budapest, it is strongly recommended to use officially authorized taxis: Főtaxi: (+361) 222-2222, City Taxi: (+361) 211-1111, Tele5taxi: (+361) 555-5555. Estimated taxi fare: 30 EUR (one way)
At the airport, you may also take the minibus. The fixed price for the Airport Minibus Service is about 15 EUR (return ticket is 20 EUR), which will take you to any destination in Budapest and also pick you up at your hotel for your return flight.
Public transportation between the airport and the hotels/congress venue is less expensive (3 Euro for a one-way trip) but also less convenient, with at least 3 transfers.
Take Ferihegy Freeway and Üllői Road to Kálvin Square. Turn right and drive along straight towards 'centrum', all lights straight until the sign for the Chain Bridge on Erzsébet tér. That will lead you to the Roosevelt Square (circular way towards the bridge). Take inner lane and follow signs to the hotel into the street between two hotels.