WEBAug 15, 2024 · DALLAS, Texas – Average gasoline prices in San Diego have fallen 1.4 cents per gallon in the last week, averaging $4.65/g today, according to GasBuddy's survey of 784 stations in San Diego. Prices in San Diego are 13.4 cents per gallon lower than a month ago and stand 45.8 cents per gallon lower than a year ago.