City comparison
San Diego, CA is about 1,100 miles (1,800 km) from San Marcos, TX in a straight line. By road, the drive is roughly 1,400 miles, or about 24 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 Diego, CA to San Marcos, TX takes about 2 h 18 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 Diego, CA is on Pacific Time and San Marcos, TX is on Central Time — a 2-hour difference. When it's noon in San Diego, it's 2 p.m. in San Marcos, which puts San Diego 2 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 Diego has a population of 1,383,987, vs 67,143 in San Marcos — about 20.6× larger by population. By land area, San Diego covers about 325 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 Diego | San Marcos | Difference |
|---|---|---|---|
| Median rent | $2,080/mo | $1,251/mo | 66.3% higher in San Diego |
| Median home value | $783,300 | $248,300 | 215.5% higher in San Diego |
| Median household income | $98,657 | $47,394 | 108.2% higher in San Diego |
| Groceries index | 107.6 | 94.2 | 14.2% higher in San Diego |
| Utilities index | 169.8 | 83.2 | 104.1% higher in San Diego |
| Transportation index | 100.0 | 96.6 | 3.5% higher in San Diego |
| Healthcare index | 100.0 | 96.1 | 4.0% higher in San Diego |
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 Diego, you'd need $74,149 in San Marcos to maintain your standard of living.
Climate, safety, and demographics side by side.
San Marcos, TX is about 25.9% cheaper overall than San Diego, CA, based on our cost-of-living index. Housing costs are roughly 50% higher in San Diego than in San Marcos. If you earn $80,000 in San Diego, you'd need about $59,320 in San Marcos to keep the same standard of living.