City comparison
San Diego, CA is about 450 miles (700 km) from South San Francisco, CA in a straight line. By road, the drive is roughly 550 miles, or about 9 h 15 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 Diego, CA to South San Francisco, CA takes about 54 min, covering roughly 450 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 has a population of 1,383,987, vs 65,596 in South San Francisco — about 21.1× larger by population. By land area, San Diego covers about 325 sq mi vs 9.2 sq mi for South San Francisco.
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 | South San Francisco | Difference |
|---|---|---|---|
| Median rent | $2,080/mo | $2,649/mo | 27.4% higher in South San Francisco |
| Median home value | $783,300 | $1,113,000 | 42.1% higher in South San Francisco |
| Median household income | $98,657 | $127,062 | 28.8% higher in South San Francisco |
| Groceries index | 107.6 | 108.1 | ≈ equal (South San Francisco slightly higher) |
| Utilities index | 169.8 | 168.3 | 0.9% higher in San Diego |
| Transportation index | 100.0 | 106.1 | 6.0% higher in South San Francisco |
| Healthcare index | 100.0 | 106.0 | 6.0% higher in South San Francisco |
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 $106,783 in South San Francisco to maintain your standard of living.
Climate, safety, and demographics side by side.
San Diego, CA is about 6.4% cheaper overall than South San Francisco, CA, based on our cost-of-living index. Housing costs are roughly 10% higher in South San Francisco than in San Diego. If you earn $80,000 in San Diego, you'd need about $85,426 in South San Francisco to keep the same standard of living.