City comparison
Castle Rock, CO is about 750 miles (1,200 km) from San Antonio, TX in a straight line. By road, the drive is roughly 950 miles, or about 16 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 Castle Rock, CO to San Antonio, TX takes about 1 h 33 min, covering roughly 750 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.
Castle Rock, CO is on Mountain Time and San Antonio, TX is on Central Time — a 1-hour difference. When it's noon in Castle Rock, it's 1 p.m. in San Antonio, which puts Castle Rock 1 hours behind.
Standard-time offsets. Daylight saving applies in both cities for most of the year (exceptions: Hawaii and most of Arizona), and the gap between the two stays the same.
San Antonio has a population of 1,445,662, vs 74,065 in Castle Rock — about 19.5× larger by population. By land area, San Antonio covers about 500 sq mi vs 35 sq mi for Castle Rock.
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 | Castle Rock | San Antonio | Difference |
|---|---|---|---|
| Median rent | $1,810/mo | $1,189/mo | 52.2% higher in Castle Rock |
| Median home value | $577,500 | $198,000 | 191.7% higher in Castle Rock |
| Median household income | $135,985 | $59,593 | 128.2% higher in Castle Rock |
| Groceries index | 101.2 | 94.2 | 7.5% higher in Castle Rock |
| Utilities index | 91.2 | 83.3 | 9.5% higher in Castle Rock |
| Transportation index | 99.9 | 96.6 | 3.4% higher in Castle Rock |
| Healthcare index | 99.9 | 96.1 | 3.9% higher in Castle Rock |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Castle Rock, you'd need $79,012 in San Antonio to maintain your standard of living.
Climate, safety, and demographics side by side.
San Antonio, TX is about 21% cheaper overall than Castle Rock, CO, based on our cost-of-living index. Housing costs are roughly 55% higher in Castle Rock than in San Antonio. If you earn $80,000 in Castle Rock, you'd need about $63,210 in San Antonio to keep the same standard of living.