City comparison
San Diego, CA is about 2,400 miles (3,900 km) from Union City, NJ in a straight line. By road, the drive is roughly 3,000 miles, or about 50 hours (about 5 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 Union City, NJ takes about 4 h 51 min, covering roughly 2,400 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 Union City, NJ is on Eastern Time — a 3-hour difference. When it's noon in San Diego, it's 3 p.m. in Union City, which puts San Diego 3 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 67,258 in Union City — about 20.6× larger by population. By land area, San Diego covers about 325 sq mi vs 1.3 sq mi for Union City.
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 | Union City | Difference |
|---|---|---|---|
| Median rent | $2,080/mo | $1,415/mo | 47.0% higher in San Diego |
| Median home value | $783,300 | $448,000 | 74.8% higher in San Diego |
| Median household income | $98,657 | $59,967 | 64.5% higher in San Diego |
| Groceries index | 107.6 | 109.4 | 1.7% higher in Union City |
| Utilities index | 169.8 | 124.5 | 36.4% higher in San Diego |
| Transportation index | 100.0 | 105.0 | 4.9% higher in Union City |
| Healthcare index | 100.0 | 105.7 | 5.7% higher in Union City |
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 $88,676 in Union City to maintain your standard of living.
Climate, safety, and demographics side by side.
Union City, NJ is about 11.3% cheaper overall than San Diego, CA, based on our cost-of-living index. Housing costs are roughly 22% higher in San Diego than in Union City. If you earn $80,000 in San Diego, you'd need about $70,941 in Union City to keep the same standard of living.