City comparison
Aurora, IL is about 125 miles (225 km) from Decatur, IL in a straight line. By road, the drive is roughly 175 miles, or about 2 h 45 min behind the wheel at highway speeds.
Driving distance is a rough estimate (great-circle × 1.25); driving time assumes a 60 mph blended average. Real trips run 10–20% longer with stops.
A direct flight from Aurora, IL to Decatur, IL takes about 16 min, covering roughly 125 miles in a straight line. Connecting itineraries with a layover typically add 1–3 hours.
Block-to-block estimate at ~500 mph cruise, including taxi, climb, and descent — what an airline would publish, not pure airborne time.
Aurora has a population of 181,405, vs 70,975 in Decatur — about 2.6× larger by population. By land area, Aurora covers about 45 sq mi vs 44 sq mi for Decatur.
Population from US Census ACS. Land area from the Census Gazetteer (city proper, excluding inland water).
Cost indices by category, with the US city average (100) marked.
Index: 100 = US city average. Lower is more affordable.
Side-by-side costs, salaries, and sub-category indices.
| Metric | Aurora | Decatur | Difference |
|---|---|---|---|
| Median rent | $1,462/mo | $770/mo | 89.9% higher in Aurora |
| Median home value | $241,600 | $96,800 | 149.6% higher in Aurora |
| Median household income | $85,943 | $49,039 | 75.3% higher in Aurora |
| Groceries index | 106.3 | 93.9 | 13.2% higher in Aurora |
| Utilities index | 84.3 | 91.2 | 8.1% higher in Decatur |
| Transportation index | 100.2 | 99.3 | 0.8% higher in Aurora |
| Healthcare index | 100.4 | 99.5 | 0.8% higher in Aurora |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Aurora, you'd need $75,905 in Decatur to maintain your standard of living.
Climate, safety, and demographics side by side.
Decatur, IL is about 24.1% cheaper overall than Aurora, IL, based on our cost-of-living index. Housing costs are roughly 98% higher in Aurora than in Decatur. If you earn $80,000 in Aurora, you'd need about $60,724 in Decatur to keep the same standard of living.