South Dakota Gas Prices
Average retail price · Source: AAA · Updated daily
Today's Average
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per gallon · regular unleaded
South Dakota sits near the national average, benefiting from Midwest pipeline access while paying a premium in the Black Hills and western regions due to geographic isolation. Sioux Falls has competitive urban pricing; Rapid City and the tourist corridor near Mount Rushmore command higher prices.
⛽ Gas Tax: 28¢/gallon
Ranked #34 most expensive nationally
Top Gas Station Chains in South Dakota
HolidayCenexCasey'sShellExxon
Top South Dakota Cities for Gas Prices
South Dakota Gas Price FAQ
Is gas expensive near Mount Rushmore?
The Black Hills tourism corridor — including Rapid City, Custer, and Keystone — typically runs 15-25¢ above Sioux Falls prices. Tourist traffic and limited station competition in narrow mountain corridors support higher margins.
Where is gas cheapest in South Dakota?
Sioux Falls has the most competitive pricing in the state, with Casey's and Holiday stations offering consistent value. I-90 truck stops between Sioux Falls and Rapid City often have competitive interstate-corridor pricing.
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Gas Prices by City in South Dakota
South Dakota Gas Price — Frequently Asked Questions
What is the average gas price in South Dakota today?
South Dakota gas prices are updated daily from AAA data. Check back for today's average.
Why are gas prices lower in South Dakota than the national average?
South Dakota benefits from favorable regional factors.
What is South Dakota's gas tax?
South Dakota's state gas tax is approximately 30¢ per gallon. This is a combined state excise tax and in some states includes local levies. The federal gas tax adds an additional 18.4¢/gal on top of state taxes.
When is the cheapest time to buy gas in South Dakota?
Gas prices in South Dakota — like across the US — tend to be lowest on Mondays and Tuesdays, when weekly demand is lowest. Prices typically rise Thursday through Saturday as weekend travel demand increases. Avoiding fill-ups on Fridays and Saturdays can save 3–8¢/gal on average. South Dakota prices also tend to be lower in late fall and winter when summer-blend fuel requirements end.
Which cities in South Dakota have the cheapest gas?
Gas prices vary by city within South Dakota based on local competition, distance from fuel terminals, and population density. Use our city pages to compare prices across South Dakota: cities farther from major metro areas and distribution hubs often have slightly higher prices due to transport costs, while high-competition suburban areas near major highways tend to be cheapest.