How far is it from Castle Hill, CA to San Ramon, CA?

The distance between Castle Hill, CA and San Ramon, CA is 21 km by road.

How long does it take to drive from Castle Hill, CA to San Ramon, CA?

The drive from Castle Hill, CA to San Ramon, CA takes approximately 25 min by car.

The fastest route from Castle Hill, CA to San Ramon, CA covers 21 km with a driving time of approximately 25 min.

San Ramon, CA lies roughly to the south-east of Castle Hill, CA.

Distance: 21 kmDrive time: 25 min

Driving from Castle Hill, CA to San Ramon, CA takes about 25 min via I 680. The distance is 21 km. The straight-line distance is 17 km. Driving directions

Driving directions14 · 21 km

The return trip from San Ramon, CA to Castle Hill, CA covers roughly the same distance, 21 km.

No notable attractions were found along this route.

Distance and drive time are computed from OpenStreetMap road data with the OSRM routing engine. Updated 6 October 2026.

How far is it from Castle Hill, CA to San Ramon, CA?: The distance between Castle Hill, CA and San Ramon, CA is 21 km by road.
How long does it take to drive from Castle Hill, CA to San Ramon, CA?: The drive from Castle Hill, CA to San Ramon, CA takes approximately 25 min by car.
What is the best route from Castle Hill, CA to San Ramon, CA?: The fastest route from Castle Hill, CA to San Ramon, CA covers 21 km with a driving time of approximately 25 min.
Which direction is San Ramon, CA from Castle Hill, CA?: San Ramon, CA lies roughly to the south-east of Castle Hill, CA.