City comparison
San Antonio, TX is about 50 miles (70 km) from San Marcos, TX in a straight line. By road, the drive is roughly 60 miles, or about 57 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 San Antonio, TX to San Marcos, TX takes about 5 min, covering roughly 50 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 67,143 in San Marcos — about 21.5× larger by population. By land area, San Antonio covers about 500 sq mi vs 40 sq mi for San Marcos.
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 | San Antonio | San Marcos | Difference |
|---|---|---|---|
| Median rent | $1,189/mo | $1,251/mo | 5.2% higher in San Marcos |
| Median home value | $198,000 | $248,300 | 25.4% higher in San Marcos |
| Median household income | $59,593 | $47,394 | 25.7% higher in San Antonio |
| Groceries index | 94.2 | 94.2 | ≈ equal |
| Utilities index | 83.3 | 83.2 | ≈ equal (San Antonio slightly higher) |
| Transportation index | 96.6 | 96.6 | ≈ equal |
| Healthcare index | 96.1 | 96.1 | ≈ equal |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in San Antonio, you'd need $110,736 in San Marcos to maintain your standard of living.
Climate, safety, and demographics side by side.
San Antonio, TX is about 9.7% cheaper overall than San Marcos, TX, based on our cost-of-living index. Housing costs are roughly 25% higher in San Marcos than in San Antonio. If you earn $80,000 in San Antonio, you'd need about $88,588 in San Marcos to keep the same standard of living.