Costco Illinois Gas Prices
Find the cheapest Costco gas in Illinois— every fuel center ranked by today's price.
23 Costco fuel centers in 21 cities · 0 of 23 sell diesel
Costco operates 23 fuel centers in Illinois across 21 cities, with the largest cluster in Chicago (2 stations). Across the state, regular gas averages $3.744 and premium runs about $1.07 higher at $4.819. The lowest-priced regular pump is at Costco Plainfield in Plainfield at $3.519, while Lincoln Park in Chicago sits about $0.64 higher. Across the state, regular pump prices have eased about $0.57 over the past month, from $4.319 a month ago. Premium has eased about $0.55 over the same period.
If your vehicle takes premium, the lowest in Illinois is Costco Champaign in Champaign at $4.529. Pump prices shift from one warehouse to the next with local taxes, fuel-blend rules, and transport costs, but Costco fuel is members-only and usually runs below nearby branded stations — which is what keeps these pumps busy.
30-day Illinois average price trend
Browse Illinois cities
All Illinois stations by price
| Station | Regular | Premium |
|---|---|---|
| Plainfield Plainfield | $3.519 | $4.619 |
| Orland Park Orland Park | $3.529 | $4.649 |
| Champaign Champaign | $3.539 | $4.529 |
| Lake Zurich Lake Zurich | $3.659 | $4.799 |
| Oak Brook Oak Brook | $3.659 | $4.799 |
| Naperville Naperville | $3.669 | $4.649 |
| North Riverside North Riverside | $3.689 | $4.899 |
| Bloomingdale Bloomingdale | $3.699 | $4.799 |
| Chicago South Loop Chicago | $3.699 | $4.859 |
| East Peoria East Peoria | $3.699 | $4.569 |
Frequently asked questions
Which Costco has the cheapest gas in Illinois?
As of the latest daily update, Costco Plainfield in Plainfield has the cheapest regular gas in Illinois at $3.519 USD per gallon. Pump prices change daily, so check the ranking on this page for the current order.
How much is Costco gas in Illinois right now?
Across the 23 Costco fuel centers in Illinois, regular averages $3.744 USD per gallon and premium $4.819. Those are averages of the latest pump prices — individual stations vary, so see the per-station table on this page.
Does Costco sell diesel in Illinois?
None of the 23 Costco fuel centers in Illinois currently report a diesel price. Diesel availability varies by warehouse — check individual station pages for the latest.
Is Costco gas in Illinois cheaper than average?
Illinois Costco regular averages $3.744, about $0.08 lower than the national U.S. Costco average of $3.823. Wherever you fill up, Costco fuel is usually priced below nearby branded stations.
Do you need a Costco membership to buy gas in Illinois?
Yes — Costco gas stations in Illinois are members-only. You scan a membership card or a Costco Shop Card at the pump before fueling; non-members can't buy fuel at Costco.
How do you pay for gas at Costco in Illinois?
Costco gas stations in Illinois take any Visa credit card, PIN debit, a Costco Shop Card, and Apple Pay or Google Pay linked to a Visa — but not Mastercard, Amex, Discover, or cash at the pump.
What time do Costco gas stations open in Illinois?
Hours vary by location, and the gas station usually opens earlier and closes later than the warehouse itself. For example, the gas station at Costco Plainfield runs 6AM – 10PM on weekdays. Check the individual station page for exact hours before a long drive.