City comparison
Decatur, IL is about 900 miles (1,400 km) from San Antonio, TX in a straight line. By road, the drive is roughly 1,100 miles, or about 19 hours 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 San Antonio, TX takes about 1 h 48 min, covering roughly 900 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.
San Antonio has a population of 1,445,662, vs 70,975 in Decatur — about 20.4× larger by population. By land area, San Antonio covers about 500 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 | Decatur | San Antonio | Difference |
|---|---|---|---|
| Median rent | $770/mo | $1,189/mo | 54.4% higher in San Antonio |
| Median home value | $96,800 | $198,000 | 104.5% higher in San Antonio |
| Median household income | $49,039 | $59,593 | 21.5% higher in San Antonio |
| Groceries index | 93.9 | 94.2 | ≈ equal (San Antonio slightly higher) |
| Utilities index | 91.2 | 83.3 | 9.4% higher in Decatur |
| Transportation index | 99.3 | 96.6 | 2.8% higher in Decatur |
| Healthcare index | 99.5 | 96.1 | 3.6% higher in Decatur |
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 $118,132 in San Antonio to maintain your standard of living.
Climate, safety, and demographics side by side.
Decatur, IL is about 15.3% cheaper overall than San Antonio, TX, based on our cost-of-living index. Housing costs are roughly 67% higher in San Antonio than in Decatur. If you earn $80,000 in Decatur, you'd need about $94,505 in San Antonio to keep the same standard of living.