Taxi service is notoriously bad in San Francisco, and finding a cab can be frustratingly difficult. Popular nightlife locales, such as the Mission, SoMa, North Beach, and the Castro, are the easiest places to hail a cab off the street; hotel taxi stands are also an option. If you're going to the airport, make a reservation or book a shuttle instead. Taxis in San Francisco charge $3.50 for the first 0.5 mile (one of the highest base rates in the United States), 55¢ for each additional 0.2 mile, and 55¢ per minute in stalled traffic; a $4 surcharge is added for trips from the airport. There’s no charge for additional passengers; there’s no surcharge for luggage. For trips farther than 15 miles outside city limits, multiply the metered rate by 1.5; tolls and tip are extra.
That said, San Francisco's poor taxi service was a direct factor in the creation of ridesharing services, such as Uber and Lyft, which are easy to use and prominent throughout the city and its surrounding areas. San Franciscans generally regard taxis as a thing of the past and use ridesharing on a day-to-day basis. If you're willing to share a car with strangers, a trip within the city can run as low as $4; rates go up for private rides and during peak-demand times. These services are especially economical when going to or from the airport, where a shared ride starts at about $25—half the cost of a cab.