The average home natural gas bill in Illinois is $100 per month — that's 12% above the U.S. average of $90, the 16th most expensive of 51 states.
| Illinois average | $100 per month |
|---|---|
| U.S. average | $90 per month |
| Difference | +12% (+$11/yr) |
| Rank (most expensive) | 16th of 51 |
Illinois ranks 16th of 51 for natural gas bill cost. The main reason is cold winters driving heavy heating use and higher regional gas prices. Your own bill still depends on your home size, your usage, and which providers serve your address — so it pays to know where your state stands before you call to negotiate.
Your state's full breakdown plus the easiest ways to lower your bill. Free, no obligation.
The levers that move your bill the most: a programmable thermostat set a few degrees lower; sealing drafts and adding insulation; an annual furnace tune-up for efficiency; lowering the water-heater temperature. Most cost little or nothing to start, and they stack — knock out two or three and the monthly savings add up fast.
Get the Free Illinois Natural Gas Bill Report →The average home natural gas bill in Illinois is about $100 per month as of 2026 — 12% above the national average of $90 per month. Your actual bill depends on your home, your usage, and which providers serve your address.
Illinois ranks 16th out of 51 for natural gas bill cost. Bills run high largely because of cold winters driving heavy heating use and higher regional gas prices.
The fastest levers: a programmable thermostat set a few degrees lower, sealing drafts and adding insulation, an annual furnace tune-up for efficiency. Most of these cost little or nothing to start.