Propane Prices in Illinois (Week of Oct 19, 2026)
Residential propane in Illinois averaged $1.94 a gallon for the week of Oct 19, 2026 (+6.1% in two weeks) – 28% below the US average and the 6th lowest of 38 states EIA surveys.
Source: EIA Heating Oil and Propane Update (weekly, excluding taxes). Updated automatically each week from October to March.
Cost to fill a tank in Illinois
| Delivery | Gallons | Cost at $1.94/gal |
|---|---|---|
| 20 lb grill cylinder (≈4.7 gal) | 4.7 | $9.13 |
| 100 lb cylinder (≈23.6 gal) | 23.6 | $45.85 |
| 500-gallon tank, 20% → 80% | 300 | $582.90 |
| 1,000-gallon tank, 20% → 80% | 600 | $1,165.80 |
Before sales tax, delivery minimums or small-delivery fees, which vary by dealer.
Cheapest way to heat in Illinois right now
| Heating system | Cost per million BTU of heat |
|---|---|
| Natural gas furnace (95%) | $11.42 |
| Heat pump (HSPF2 9, COP ≈2.6) | $21.67 |
| Propane furnace (90%) | $23.61 |
| Electric baseboard (COP 1) | $56.33 |
Using Illinois's current averages for propane, natural gas and electricity (19.22¢/kWh). Prices for natural gas in Illinois and electricity in Illinois.
Nearby states
Frequently asked questions
What is the price of propane in Illinois this week?
$1.94 per gallon on average for homes in the week of Oct 19, 2026, before taxes (EIA survey). That is 28% below the US average of $2.69, and +6.1% since Oct 5, 2026.
How much does it cost to heat with propane in Illinois?
At $1.94 a gallon, 500 gallons over a winter costs about $972 before tax. Actual use depends on the house, insulation and winter – check your past deliveries and enter them in the calculator.
Is propane cheaper than other heat in Illinois?
Per million BTU of heat, propane costs about $23.61 in Illinois this week. The cheapest option at current state averages is natural gas furnace (95%) at $11.42.
Source: EIA weekly residential propane prices. Heat comparison uses typical efficiencies and EIA state averages.