Ontario to San Ramon: Road Trip Guide & Distance

How far is Ontario from San Ramon?

The distance from Ontario to San Ramon is 352.8 miles (567.8 km) as the crow flies. San Ramon is located NW of Ontario. By car, the driving distance is approximately 423.4 miles, taking about 8h 31min. A direct flight would take roughly 1h 13min. Both are located in United States.

This is a solid day of driving. Be sure to take breaks every 2-3 hours to avoid driver fatigue, and plan your meals ahead of time. Since you'll be heading mostly West, pack a good pair of sunglasses if you plan to drive during the late afternoon to avoid the harsh sun glare.

Coordinates come from public place data for Ontario and San Ramon. The driving distance is estimated from straight-line distance with a road-factor model, so confirm the route in your navigation app. Fuel, flight, bus, and train values are planning estimates and can change by date, provider, road closures, and border rules.