Gas prices in Illinois today

As of 2026-09-09High confidenceper gallon

Regular

$4.42

= €1.00/L · $1.17/L

+3.9% vs 51-state avg

Premium

$5.54

= €1.26/L · $1.46/L

Diesel

$5.93

= €1.35/L · $1.57/L

Daily state average incl. taxes — AAA — Daily State Gas Price Averages. Midgrade: $5.00/gal.

Gas stations in Illinois

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

Explore stations, fuel options and directions.

The octane step

$1.12

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

Illinois gas prices by metro area

AAA reports separate daily averages for 17 Illinois metros — $0.46 a gallon between the cheapest and the dearest.

Quincy$4.26 Rockford$4.31 Lake County$4.35 East Saint Louis$4.36 Springfield$4.36 Bloomington-Normal$4.38 Decatur$4.38 Peoria-Pekin$4.38 Elgin$4.39 Champaign-Urbana$4.40 Davenport-Moline-Rock Island (IL only)$4.43 Danville$4.43 Kankakee-Bradley$4.44 Carbondale-Marion$4.46 Chicago Metro$4.51 Alexander County$4.70 City of Chicago$4.73

AAA metro averages · 2026-09-09

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

Cost to fill up · regular at $4.42/gal

Compact — 12 gal$53.02
Sedan / crossover — 15 gal$66.27
SUV — 20 gal$88.36
Full-size pickup — 26 gal$114.87

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

Tax on every gallon

$0.85

$0.18 federal + $0.67 Illinois · 2 highest of 51

Where your money goes$3.56 fuel + $0.85 tax

Tax is 19% of the pump price in Illinois. Counties and cities here may add a local fuel tax on top, which this does not include. Pre-tax figure is an estimate — state rates as of 2026-01-01.

Compare all 50 states’ gas taxes →

Illinois 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.

Indiana$3.49−$0.93 vs Illinois Kentucky$3.84−$0.58 vs Illinois Missouri$3.88−$0.54 vs Illinois Wisconsin$3.97−$0.45 vs Illinois Iowa$4.06−$0.36 vs Illinois

The answer, in full — and where it comes from

As of 9 September 2026, regular gasoline in Illinois averages $4.42/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 Illinois averages $5.00/gal. Premium gasoline in Illinois averages $5.54/gal. Diesel in Illinois averages $5.93/gal.

Price:: $4.42/gal
Fuel:: Regular gasoline
Price basis:: State average
Applies to:: Illinois (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 Illinois right now?

Regular gasoline in Illinois averages $4.42 per gallon today (AAA daily state average). Midgrade is $5.00, premium $5.54 and diesel $5.93.

Is gas in Illinois expensive compared to other states?

Illinois ranks 42 of 51 states from cheapest to most expensive for regular gas this week.

Is gas in Illinois above or below the US average?

Regular in Illinois is 3.9% above 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 Illinois?

$0.85 a gallon — $0.18 federal plus $0.67 in Illinois state taxes and fees, the 2 highest of 51 states. That is about 19% of the pump price. Counties and cities in Illinois may add a local fuel tax on top of this. Rates as of 2026-01-01.

How much does it cost to fill up in Illinois?

At today's average of $4.42 a gallon, a 15-gallon sedan tank costs $66.27 to fill from empty, and a 26-gallon full-size pickup $114.87.