City comparison
Fairfield, CA is about 475 miles (750 km) from San Diego, CA in a straight line. By road, the drive is roughly 600 miles, or about 9 h 45 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 Fairfield, CA to San Diego, CA takes about 56 min, covering roughly 475 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 119,420 in Fairfield — about 11.6× larger by population. By land area, San Diego covers about 325 sq mi vs 42 sq mi for Fairfield.
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 | Fairfield | San Diego | Difference |
|---|---|---|---|
| Median rent | $2,047/mo | $2,080/mo | 1.6% higher in San Diego |
| Median home value | $546,200 | $783,300 | 43.4% higher in San Diego |
| Median household income | $98,857 | $98,657 | 0.2% higher in Fairfield |
| Groceries index | 105.1 | 107.6 | 2.4% higher in San Diego |
| Utilities index | 152.6 | 169.8 | 11.3% higher in San Diego |
| Transportation index | 100.7 | 100.0 | 0.6% higher in Fairfield |
| Healthcare index | 100.6 | 100.0 | 0.6% higher in Fairfield |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Fairfield, you'd need $108,729 in San Diego to maintain your standard of living.
Climate, safety, and demographics side by side.
Fairfield, CA is about 8% cheaper overall than San Diego, CA, based on our cost-of-living index. Housing costs are roughly 14% higher in San Diego than in Fairfield. If you earn $80,000 in Fairfield, you'd need about $86,983 in San Diego to keep the same standard of living.