Gas prices in South Dakota today
Regular gas in South Dakota averages $4.23 a gallon, 1% less than the U.S. average of $4.27. That makes South Dakota in the middle: rank 27 of 51 (1 = cheapest).
| Grade | South Dakota | U.S. average | 15-gallon fill-up |
|---|---|---|---|
| Regular | $4.23 | $4.27 | $63 |
| Mid-grade | $4.45 | $4.78 | $67 |
| Premium | $5.04 | $5.17 | $76 |
| Diesel | $6.06 | $6.35 | $91 |
Source: AAA, South Dakota average gas prices and AAA State Gas Price Averages, as of Oct 24, 2026. Fill-up = price × 15 gallons (our calculation). For metro-area prices, see AAA's South Dakota page.
Taxes in the price: 30.0¢ a gallon in South Dakota state taxes and fees plus the 18.4¢ federal tax, 48.4¢ in all, about 11% of today's price (Tax Foundation, July 2026; our calculation). Gas tax in South Dakota.
What driving costs in South Dakota
At $4.23 a gallon, a car that gets 27.2 mpg (the EPA's average for new vehicles) spends about $156 on gas every 1,000 miles, or 15.6 cents a mile (our calculation). Charging an electric car at South Dakota's average home electricity price costs about $47 for the same 1,000 miles. Gas is only one part of the bill: full-coverage car insurance in South Dakota averages $1,824 a year.
Planning a drive? The road trip cost calculator uses today's gas price, and the true cost of owning a car puts fuel next to insurance, repairs and depreciation.
Common questions
What is the average gas price in South Dakota today?
Regular gas in South Dakota averaged $4.23 a gallon on Oct 24, 2026, per AAA. Mid-grade was $4.45, premium $5.04 and diesel $6.06.
Is gas in South Dakota cheaper than the national average?
Yes. South Dakota's $4.23 is 1% less than the U.S. average of $4.27, which ranks it 27 of 51 states and DC (1 = cheapest, our ranking of AAA data).
How much does it cost to fill up a car in South Dakota?
About $63 for 15 gallons of regular at today's South Dakota average (our calculation). Driving 1,000 miles in a car that gets 27.2 mpg costs about $156 in gas.
Is an electric car cheaper to run than gas in South Dakota?
At South Dakota's average home electricity price, charging an EV for 1,000 miles costs about $47, compared with about $156 in gas for a 27.2 mpg car (our calculation from EIA and AAA prices, 31 kWh per 100 miles from fueleconomy.gov).
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