Gas Prices in Sioux Falls, SD Today

Sioux Falls drivers are paying around $3.18 per gallon for regular unleaded as of late March 2026, well below the national average of $3.91. South Dakota consistently ranks among the cheapest states for gasoline in the country, and Sioux Falls typically sits at or below the state average. If you're filling up here instead of passing through on I-29 or I-90, you're already in good shape.

Why South Dakota Gas Is So Cheap

Three structural factors keep fuel prices low in Sioux Falls and across South Dakota.

First, the state gas tax. South Dakota charges 28 cents per gallon, lower than most Midwest neighbors. Iowa charges 32.5 cents, Minnesota 28.5 cents, Nebraska 24.8 cents plus additional fees. South Dakota also has no state income tax, which affects how aggressively retailers compete on fuel since station operators face a lower overall tax burden on business income.

Second, proximity to Midwest pipeline infrastructure. The region is served by multiple refined product pipelines, including those connecting to the Midwest refining complex around Wood River, Illinois and Channahon, Illinois. The combination of short haul distances and competition among several distributors keeps rack prices, what stations pay before markup, lower than in more isolated markets.

Third, ethanol. South Dakota is a major corn state, and E10 is standard everywhere, with E15 available at many stations. Higher ethanol blends cost less per gallon to produce and are often priced 5–10 cents below standard blended fuel. If your vehicle is compatible with E15, you have access to an easy, immediate savings option at many Sioux Falls pumps.

Where to Find the Cheapest Gas in Sioux Falls

Prices vary more than you'd expect across a mid-sized city. The highest prices cluster near the I-29/I-90 interchange and along tourist and truck-stop corridors. The cheapest stations are typically on surface streets in residential areas where locals are the primary customers.

Search by ZIP to find stations near you:

• West side / Airport corridor, 57106, 57108, competitive cluster along 41st Street corridor
• Downtown and north Sioux Falls, 57103, 57104, more urban, some stations cater to commuters
• South and central, 57105, 57107, residential areas with steady local competition

E15 and Ethanol: Sioux Falls's Local Advantage

More stations in Sioux Falls offer E15 than you'll find in coastal markets, partly because ethanol is a local agricultural product and partly because South Dakota's infrastructure is set up for it. E15 requires a vehicle manufactured in 2001 or later (nearly all cars on the road today), and the EPA has approved it for year-round use since 2022. Look for the green E15 nozzle, it's frequently priced 8–12 cents below the regular E10 price at the same pump.

Seasonal Considerations

South Dakota winters are serious, and fuel blends shift seasonally. Winter-blend gasoline has lower volatility specs, which reduces production cost and typically pushes prices down slightly in January and February. The March-to-April transition can bring a temporary spike as refineries switch to summer blends and stations work through inventory. If prices are ticking up right now, that's part of why, and they typically stabilize again by late April.

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