You can get to Buzios through the Galeao International Airport, which is located in Rio de Janeiro. And from there, by bus to cover the 175 kilometers.
Another option is the Cabo Frio Airport, and from there by bus or taxi, to make the 30 kilometers to Buzios.
International flights do not arrive at this airport.
From Rio de Janeiro it is reached in a trip of 3 to 4 hours. The buses to Buzios leave from the Rodoviaria Novo Rio station.
See more about the location of Buzios
See also information on Cabo Frio.