(1) Summon Taxi rides: Whatever is on the meter + $1.00 convenience fee. The minimum fare for Summon Taxi is $7 + $1 convenience fee.
(2) Summon Personal rides: $3.15 base + $1.35 per mile + $0.27 per minute. The minimum fare for Summon Personal is $6.
This means that the route, time, and traffic conditions may all affect fares for better or for worse.
You can find more details about San Francisco's metered rates by the SFMTA here: http://www.sfmta.com/cms/xcust/indxtxcust.htm. You can also refer to TaxiFareFinder for accurate taxi fare estimates.
If you ever have any questions or concerns about a particular fare, riders can always request a fare check from within their trips page, or by simply responding to their email receipt. We'll address fare issues and adjust them as necessary!