With almost 30 years in Marin County, Marin Airporter offers scheduled service between Marin County and the San…More Francisco International Airport seven days a week, 365 days a year. There is a scheduled bus service from six locations in Marin County (all of the drivers and vehicles are also fully SPAB-certified for carrying school groups to field trips, sporting events or overnight trips out of town.)</p> <p>Fares start at $20 for adults, with children ages 5 - 9 riding at half fare, and children 4 and under free. The company accepts cash, traveler's checks and local personal checks only (no credit cards).</p>