City comparison
Decatur, IL is about 150 miles (225 km) from Downers Grove, IL in a straight line. By road, the drive is roughly 175 miles, or about 3 h 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 Decatur, IL to Downers Grove, IL takes about 17 min, covering roughly 150 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.
Decatur has a population of 70,975, vs 49,996 in Downers Grove — about 1.4× larger by population. By land area, Decatur covers about 44 sq mi vs 15 sq mi for Downers Grove.
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 | Decatur | Downers Grove | Difference |
|---|---|---|---|
| Median rent | $770/mo | $1,535/mo | 99.4% higher in Downers Grove |
| Median home value | $96,800 | $425,000 | 339.0% higher in Downers Grove |
| Median household income | $49,039 | $115,461 | 135.4% higher in Downers Grove |
| Groceries index | 93.9 | 106.3 | 13.2% higher in Downers Grove |
| Utilities index | 91.2 | 84.3 | 8.1% higher in Decatur |
| Transportation index | 99.3 | 100.2 | 0.8% higher in Downers Grove |
| Healthcare index | 99.5 | 100.4 | 0.8% higher in Downers Grove |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Decatur, you'd need $132,007 in Downers Grove to maintain your standard of living.
Climate, safety, and demographics side by side.
Decatur, IL is about 24.2% cheaper overall than Downers Grove, IL, based on our cost-of-living index. Housing costs are roughly 99% higher in Downers Grove than in Decatur. If you earn $80,000 in Decatur, you'd need about $105,605 in Downers Grove to keep the same standard of living.