Gas Prices in San Antonio, TX Today

Updated April 5, 2026 — Prices updated regularly from EIA data

$2.75

Average Regular Unleaded — San Antonio, Texas

Current Gas Prices in San Antonio

The going rate for a gallon of regular unleaded in San Antonio, Texas is $$2.75 today. Local price variation gives shoppers a meaningful advantage when they take a few minutes to compare nearby stations.

Fuel TypePrice / GallonGradeTrend
Regular Unleaded$2.7587 octane▲ Rising
Mid-Grade$3.1889 octane▲ Rising
Premium$3.4491-93 octane▲ Rising
Diesel$3.72N/A▲ Rising

Price Comparison

San Antonio Average
$2.75
Regular Unleaded
Texas State Average
$2.73
near the state average
National Average
$3.99
$1.24 below the national average

About Gas Prices in San Antonio

The best time to buy gas in San Antonio follows the national pattern: Tuesday and Wednesday consistently show the lowest weekly prices, while Thursday through Sunday prices climb with weekend demand. Monthly, prices often dip mid-month. Following these patterns in San Antonio can save 5-15 cents per gallon.

Gas Prices by Brand in This City

Estimated prices based on brand modifiers. Sorted cheapest to most expensive.

CHEAPEST
Costco
$2.60
Speedway
$2.72
Circle K
$2.73
Sunoco
$2.76
Marathon
$2.77
BP
$2.79
Mobil
$2.80
Exxon
$2.81
Shell
$2.83
Chevron
$2.85

Fuel Type Prices in This City

Regular Unleaded
87 octane
Premium Gasoline
91-93 octane
Diesel Fuel
N/A

Gas Prices in Nearby Cities

Austin$2.80
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Frequently Asked Questions

Premium gas in San Antonio is worth the extra cost only if your vehicle requires it. If your owner's manual says Required, always use premium. If it says Recommended, you may use regular with minimal performance loss. Never use regular in a vehicle that requires premium.
Costco offers the cheapest gas wherever it operates in the San Antonio area. Among street stations, Circle K, Speedway, and Wawa (in applicable markets) consistently offer below-average prices. Shell, Chevron, and BP typically price above the local average.
At today's San Antonio average of $$2.75 per gallon, a standard 13-gallon sedan tank costs ${fillCost} to fill. A larger 20-gallon SUV or truck tank runs ${truckFill}. Choosing the cheapest local station can save $3-5 on each fill-up.
Monday and Tuesday are statistically the cheapest days to buy gas in most US cities including San Antonio. Prices rise Thursday through Sunday as weekend driving demand increases. Filling up Tuesday afternoon before price adjustments is a reliable strategy.
San Antonio and surrounding cities typically track similar fuel prices given shared supply infrastructure. Differences of 5-15 cents between nearby cities are common depending on local tax differences and competition levels.

Related Gas Price Pages

Gas Prices in TexasCheapest Gas in San AntonioGas Prices Near San AntonioCompare All StatesRegular Unleaded in San AntonioPremium Gasoline in San AntonioDiesel Fuel in San AntonioShell - San AntonioExxon - San AntonioBP - San AntonioChevron - San AntonioMobil - San AntonioGas Prices in Austin