cost gas in san antonio
2 days ago. $1.92update. There are 524 Regular gas price reports in the past 5 days in San Antonio, TX. The average Regular gas price in San Antonio, TX is $1.99, which is $0.79 lower than U.S. national average Regular gas price $2.78. The lowest Regular gas price is $1.88 of Exxon located at 5603 N Foster Rd, San Antonio, TX 78244. The highest Regular gas price is $2.48 of Shamrock located at 7425 Mainland Dr, San Antonio, TX 78250.