⛽ Costco Gas Prices in Illinois
Estimated today · Based on Illinois AAA avg · Source: AAA + historical Costco savings data
Illinois Avg Today
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per gallon · regular
Est. Costco Price
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~15–30¢ below state avg
⚠️ Costco does not publish real-time prices. Estimated price uses today's Illinois AAA average minus Costco's typical 15–30¢/gal savings. Actual prices vary by location.
Illinois Gas Tax Context
Illinois's state gas tax is approximately 46¢ per gallon — above the national average. This tax applies equally to all stations including Costco, so the 15–30¢ membership discount is on top of the post-tax street price. In high-tax states like Illinois, the absolute price at the pump is higher, but the relative savings from a Costco membership remain the same.
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~16 Costco locations in Illinois
Use the Costcoapp or website to find the nearest fuel center and confirm today's price.
Membership required
Costco fuel is available to members only. $65–$130/year · Gold Star ($65/year)
Costco Gas in Illinois — FAQs
How much is gas at Costco in Illinois today?
Based on today's Illinois average of current local prices, Costco in Illinois is estimated at around $a few cents less per gallon. Costco typically prices 15–30¢ per gallon below the state average.
Is Costco gas cheaper than regular gas stations in Illinois?
Yes. Costco gas in Illinois is typically 15–30¢ per gallon cheaper than branded stations. Illinois has relatively high state gas taxes (~46¢/gal), which affects all stations equally — the Costco discount still applies on top of that base.
Do you need a membership for Costco gas in Illinois?
Yes. A valid Costco Membership ($65–$130/year) is required to purchase fuel at any Costco location, including those in Illinois.
Why is gas more expensive in Illinois than the national average?
Illinois gas prices are currently near the national average of $—. State gas tax is approximately 46¢/gal.