Illinois Gas Prices
Average retail price · Source: AAA · Updated daily
Today's Average
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per gallon · regular unleaded
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Gas Prices by City in Illinois
Illinois Gas Price — Frequently Asked Questions
What is the average gas price in Illinois today?
Illinois gas prices are updated daily from AAA data. Check back for today's average.
Why are gas prices lower in Illinois than the national average?
Illinois prices are driven by high state and local taxes (~46¢/gal), particularly in the Chicago metro area where additional county taxes apply.
What is Illinois's gas tax?
Illinois's state gas tax is approximately 46¢ per gallon. This is a combined state excise tax and in some states includes local levies. The federal gas tax adds an additional 18.4¢/gal on top of state taxes.
When is the cheapest time to buy gas in Illinois?
Gas prices in Illinois — like across the US — tend to be lowest on Mondays and Tuesdays, when weekly demand is lowest. Prices typically rise Thursday through Saturday as weekend travel demand increases. Avoiding fill-ups on Fridays and Saturdays can save 3–8¢/gal on average. Illinois prices also tend to be lower in late fall and winter when summer-blend fuel requirements end.
Which cities in Illinois have the cheapest gas?
Gas prices vary by city within Illinois based on local competition, distance from fuel terminals, and population density. Use our city pages to compare prices across Illinois: cities farther from major metro areas and distribution hubs often have slightly higher prices due to transport costs, while high-competition suburban areas near major highways tend to be cheapest.