Gas Prices in Illinois Today

Updated April 5, 2026 — Prices updated regularly from EIA data

$3.36

Average regular unleaded — Illinois

Today's Illinois Gas Prices

Gas prices in Illinois currently average $$3.36 per gallon for regular unleaded, below ($0.63) the national average of ${natAvg}. Prices across Illinois's cities and towns reflect the state's state fuel tax of 39 cents per gallon fuel tax and Midwest regional supply chain.

Fuel TypePrice / GallonGradeTrend
Regular Unleaded$3.3687 octane▲ Rising
Mid-Grade$3.8889 octane▲ Rising
Premium$4.2091-93 octane▲ Rising
Diesel$4.55N/A▲ Rising

Gas Prices Across Illinois Cities

Chicago$3.31Aurora$3.35Naperville$3.43Joliet$3.32Rockford$3.59Springfield$3.34Elgin$3.56Peoria$3.65Champaign$3.57Waukegan$3.44Bloomington$3.67Evanston$3.47Decatur$3.67Schaumburg$3.58Des Plaines$3.62

About Illinois Fuel Markets

Illinois charges 39 cents per gallon in state fuel taxes. The Midwest state relies on regional fuel infrastructure for supply.

Fuel Type Prices in This City

Regular Unleaded
87 octane
Premium Gasoline
91-93 octane
Diesel Fuel
N/A

Gas Prices in Neighboring & Popular States

CaliforniaCAFloridaFLGeorgiaGANew YorkNYNorth CarolinaNCOhioOH
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Frequently Asked Questions

The current average price for regular unleaded in Illinois is $$3.36 per gallon. Mid-grade averages $$3.88 and premium runs $$4.20. Diesel is $$4.55 per gallon. Prices vary by city and brand by 10-25 cents per gallon across the state.
Illinois's gas prices reflect its state fuel tax of 39 cents per gallon state fuel tax of 39 cents per gallon and its Midwest location. {supplyNote} also plays a significant role in what Illinois drivers pay at the pump.
Gas prices within Illinois typically vary 10-20 cents across cities. Urban areas with intense station competition often have better prices than rural regions with fewer options. Warehouse clubs in any major Illinois city consistently offer the best prices statewide.
In Illinois, as in most US states, Monday and Tuesday tend to show the lowest weekly prices. Prices rise Thursday through Sunday as weekend demand increases. Filling up Tuesday afternoon typically captures the weekly low.
Illinois charges 39 cents per gallon in state fuel taxes. The national average is around 30 cents per gallon. Illinois's tax places it among the mid-range states nationally for fuel taxation.

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