It is generally allowed to book a one-way rental between SIXT stations in Bulgaria, depending on the tariff. One-way rentals to other countries may also be allowed with prior approval from the rental station. An additional fee may apply.
You will need a valid driver’s license that’s been held for at least 1 year, plus an ID or passport for rental with SIXT. If your license is from outside the country and not in English, German or French, you will also need an international driving permit.
The minimum age for a SIXT rental in Bulgaria is 20, with a driver’s license held for at least 1 year. Some car categories have a higher minimum rental age, and an underage driver fee is charged for those under 23.