Gas prices in South Dakota today

As of 2026-09-09High confidenceper gallon

Regular

$4.10

= €0.93/L · $1.08/L

-3.6% vs 51-state avg

Premium

$4.84

= €1.10/L · $1.28/L

Diesel

$5.62

= €1.28/L · $1.49/L

Daily state average incl. taxes — AAA — Daily State Gas Price Averages. Midgrade: $4.31/gal.

Gas stations in South Dakota

Stations color-coded by brand — the panel ranks the providers and you can filter to one brand. Move the map anywhere in South Dakotaand press “Search this area”.

Explore stations, fuel options and directions.

The octane step

$0.74

a gallon more for premium than regular in South Dakota. How that compares with every other state, and whether your car needs it.

South Dakota gas prices by metro area

AAA reports separate daily averages for 3 South Dakota metros — $0.25 a gallon between the cheapest and the dearest.

Sioux Falls$4.02 North Sioux City$4.03 Rapid City$4.27

AAA metro averages · 2026-09-09

What a tank costs in South Dakota, and how much of it is tax

Cost to fill up · regular at $4.10/gal

Compact — 12 gal$49.16
Sedan / crossover — 15 gal$61.46
SUV — 20 gal$81.94
Full-size pickup — 26 gal$106.52

From empty, at today’s South Dakota average. Your vehicle and mileage →

Tax on every gallon

$0.48

$0.18 federal + $0.30 South Dakota · 32 highest of 51

Where your money goes$3.61 fuel + $0.48 tax

Tax is 12% of the pump price in South Dakota. Pre-tax figure is an estimate — state rates as of 2026-01-01.

Compare all 50 states’ gas taxes →

South Dakota compared with neighbouring states

Where the line is worth crossing, and where it is not — each comparison shows how much of the gap is tax rather than the fuel itself.

Nebraska$4.00−$0.09 vs South Dakota North Dakota$4.04−$0.06 vs South Dakota Iowa$4.06−$0.04 vs South Dakota Minnesota$4.15+$0.06 vs South Dakota Montana$4.41+$0.31 vs South Dakota Wyoming$4.41+$0.31 vs South Dakota

The answer, in full — and where it comes from

As of 9 September 2026, regular gasoline in South Dakota averages $4.10/gal, the state average. Source: Daily fuel gauge report, AAA (a third-party aggregator, published daily). Retrieved by FuelWide on 9 September 2026.

Midgrade gasoline in South Dakota averages $4.31/gal. Premium gasoline in South Dakota averages $4.84/gal. Diesel in South Dakota averages $5.62/gal.

Price:: $4.10/gal
Fuel:: Regular gasoline
Price basis:: State average
Applies to:: South Dakota (state level)
Measured:: 2026-09-09
Retrieved:: 2026-09-09
Source:: AAA — a third-party aggregator

Daily fuel gauge report · State and metro averages: AAA · How we measure this

Frequently asked questions

How much is gas in South Dakota right now?

Regular gasoline in South Dakota averages $4.10 per gallon today (AAA daily state average). Midgrade is $4.31, premium $4.84 and diesel $5.62.

Is gas in South Dakota expensive compared to other states?

South Dakota ranks 24 of 51 states from cheapest to most expensive for regular gas this week.

Is gas in South Dakota above or below the US average?

Regular in South Dakota is 3.6% below the unweighted mean of AAA's 51 state averages ($4.25/gal), measured on 2026-09-09. The EIA publishes a separate, volume-weighted national average weekly; the two are different measurements and will not match.

How much tax is on a gallon of gas in South Dakota?

$0.48 a gallon — $0.18 federal plus $0.30 in South Dakota state taxes and fees, the 32 highest of 51 states. That is about 12% of the pump price. Rates as of 2026-01-01.

How much does it cost to fill up in South Dakota?

At today's average of $4.10 a gallon, a 15-gallon sedan tank costs $61.46 to fill from empty, and a 26-gallon full-size pickup $106.52.