Gas Prices in Illinois Today
Track today's average gas price in Illinois, compare it to the national average, and estimate your fuel costs with a free calculator. Prices come from the EIA's weekly retail gasoline survey.
Average Gas Price for Illinois (EIA Midwest region)
$4.27/gal
Same as the national average
EIA weekly price for regular gasoline, week of October 26, 2026.
Estimate Your Gas Cost in Illinois
The calculator below is pre-filled with this Midwest regional average. Enter your trip distance and MPG to get an instant fuel cost estimate.
Midwest Region Gas Price History
The EIA does not publish weekly prices for Illinois, so this chart shows the Midwest regional average for regular gasoline, the same series behind the Illinois price above. The region also covers Indiana, Iowa, Kansas, Kentucky, Michigan, Missouri, Nebraska, North Dakota, Oklahoma, South Dakota, Tennessee, and Wisconsin, so the line describes the region as a whole, not Illinois alone. The latest week is $1.40 a gallon higher than a year earlier.
Latest week
$4.27
October 26, 2026
A year earlier
$2.87
October 27, 2025
Highest week shown
$4.41
May 11, 2026
Lowest week shown
$2.58
January 5, 2026
Source: EIA weekly retail prices for regular gasoline, Midwest regional average, November 4, 2024 to October 26, 2026. Prices in dollars per gallon.
About Gas Prices in Illinois
The U.S. Energy Information Administration (EIA) surveys fuel retailers weekly but doesn't publish a separate price for Illinois, so the price shown is the EIA's Midwest regional average for regular unleaded gasoline. Prices at individual stations in Illinois may be higher or lower depending on location, brand, and local competition.
Several factors influence Illinois's gas price: state fuel taxes, the distance from major refineries, pipeline and distribution infrastructure, and the required seasonal fuel blend. Use the calculator above to see exactly how today's Illinois price affects your commute, road trip, or monthly driving budget.
Illinois Fuel Taxes: ≈67¢/gal
Illinois has among the highest combined fuel tax burdens in the nation. Illinois doubled its motor fuel tax in 2019 and indexes it to inflation annually — it now sits around 47 cents per gallon. Uniquely, Illinois is also one of the few states that charges general sales tax on gasoline on top of the excise tax, and Chicago and Cook County stack their own local fuel taxes on top of that. The combined burden is among the highest in the nation.
Tax figures are approximate state-level taxes and fees per gallon of regular gasoline and exclude the 18.4¢/gal federal excise tax. Rates change, so verify current rates with the state's revenue or transportation department.
How Illinois Gets Its Gasoline
Supply-wise Illinois is well positioned, served by major Midwest refineries including one of the largest in the country at Joliet, plus pipelines from the Gulf Coast. Chicago-area stations must also sell reformulated gasoline, which adds a few cents versus the conventional fuel sold downstate.
Where Gas Is Cheapest and Most Expensive in Illinois
The result is a steep north-south gradient: Chicago and Cook County routinely pay 50–80 cents more than downstate cities like Springfield, Marion, or Quincy — one of the largest in-state price spreads in America. Drivers near the Indiana or Missouri border often cross state lines to fill up.