City comparison
San Antonio, TX is about 1,100 miles (1,800 km) from San Marcos, CA in a straight line. By road, the drive is roughly 1,400 miles, or about 23 hours (about 2 days at 10 h/day) 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, CA takes about 2 h 15 min, covering roughly 1,100 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, TX is on Central Time and San Marcos, CA is on Pacific Time — a 2-hour difference. When it's noon in San Antonio, it's 10 a.m. in San Marcos, which puts San Antonio 2 hours ahead.
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 94,360 in San Marcos — about 15.3× larger by population. By land area, San Antonio covers about 500 sq mi vs 25 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 | $2,064/mo | 73.6% higher in San Marcos |
| Median home value | $198,000 | $728,800 | 268.1% higher in San Marcos |
| Median household income | $59,593 | $99,413 | 66.8% higher in San Marcos |
| Groceries index | 94.2 | 107.6 | 14.2% higher in San Marcos |
| Utilities index | 83.3 | 169.8 | 103.8% higher in San Marcos |
| Transportation index | 96.6 | 100.0 | 3.5% higher in San Marcos |
| Healthcare index | 96.1 | 100.0 | 4.0% higher in San Marcos |
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 $149,288 in San Marcos to maintain your standard of living.
Climate, safety, and demographics side by side.
San Antonio, TX is about 33% cheaper overall than San Marcos, CA, based on our cost-of-living index. Housing costs are roughly 88% higher in San Marcos than in San Antonio. If you earn $80,000 in San Antonio, you'd need about $119,430 in San Marcos to keep the same standard of living.