BART is one of the more affordable ways to get around the San Francisco region. If you are just coming in from the airport, this method of transportation is going to be your friend.

The Bay Area Rapid Transit is a train that can connect you with the entire Bay Area for an affordable rate. How much you pay will ultimately depend on how far you go.

However, a round trip ticket that takes you on the trains entire route is only $17.90—which may not sound cheap, but is far more affordable than many of your other options.