Average gas bill in Illinois
What a typical Illinois home with natural gas pays each month, in winter and in summer, and how that compares with the rest of the country.
Updated · EIA data
- Winter bill, Dec–Feb
- $179/mo
- Summer bill, Jun–Aug
- $42/mo
Source: U.S. Energy Information Administration, residential natural gas use and prices, July 2025 to June 2026, and residential customers, 2024. Bill and use per home are our calculation. How we calculate this
By home size
- Studio or 1-bedroom apartment$36/mo
- 2-bedroom apartment$54/mo
- 3-bedroom house$98/mo
- Large house, 2,500+ sq ft$116/mo
BillAverage estimate based on EIA data, for homes that pay their own gas bill: typical use for each home type in the Midwest (EIA's 2020 home energy survey), scaled to Illinois's average use and priced at $1.15 per therm.
Is your bill higher than this?
Gas bills here swing from about $42 a month in summer (June to August) to about $179 in winter (December to February), when heating runs.
Homes with gas service use about 81 therms a month, 51% more than the U.S. average of 54, and pay about $1.15 per therm ($11.96 per thousand cubic feet), 27% lower than the U.S. average.
About 84% of Illinois homes use natural gas at all, according to EIA's 2020 home energy survey. The rest use electricity or other fuels and have no gas bill.
Illinois gas bills by month
Average bill per residential gas customer each month, our calculation from U.S. Energy Information Administration data.
More for Illinois
Nearby states
Questions
- What is the average gas bill in Illinois?
- $94 a month over the 12 months to June 2026, for homes with natural gas service. That's our calculation from U.S. Energy Information Administration (EIA) data on residential gas use, prices and customers.
- How much is a gas bill in winter in Illinois?
- About $179 a month from December to February, when heating runs, compared with about $42 a month from June to August.
- How much does natural gas cost per therm in Illinois?
- About $1.15 per therm ($11.96 per thousand cubic feet) on average over the 12 months to June 2026, including delivery charges. The U.S. average was $1.57 per therm.
- Are gas bills in Illinois higher than average?
- Yes. $94 a month is above the U.S. average of $85, 17th highest of the 50 states and D.C..