Driving Time from Castro Valley to South San Francisco
Driving from Castro Valley to South San Francisco is about 25 mi and takes roughly 34 min. See the fuel-cost estimate, distance and route tips.
Castro Valley and South San Francisco are about 18 mi (29 km) apart in a straight line. By road that works out to roughly 25 mi (40 km), a drive of about 34 min. A nonstop flight covers the great-circle distance in approximately 32 min.
| Straight-line distance | 18 mi / 29 km |
| Road distance (est.) | 25 mi / 40 km |
| Driving time (est.) | 34 min |
| Nonstop flight (est.) | 32 min |
| Driving fuel (est., 1-way) | $3 |
| Typical flight fare | $80–$250 |
| Geographic midpoint | 37.675, -122.247 |
How these estimates work
Straight-line distance uses the haversine formula on each city's coordinates. Road distance applies a circuity factor (~1.2–1.4×) and driving time a blended average speed. Flight time uses typical jet cruise speed plus ~30 minutes for taxi, climb and descent. Treat all figures as planning estimates.
Frequently asked questions
Castro Valley to South San Francisco is about 18 mi (29 km) in a straight line, and roughly 25 mi (40 km) by road.