How long is the drive to Ontario?

It typically takes 80 minutes depending on traffic.

Yes, you can take the Metrolink with a transfer at Union Station.

What is the best route?

The I-5 South to I-10 East is the most direct route.

Ontario is a large city; exercise normal precautions in urban areas.

There are no tolls on the I-5/I-10 route, but some express lanes may have tolls.

Castaic

Ontario

Driving

Castaic to Ontario

Updated: 31 May 2026

The drive from Castaic to Ontario is a 70-mile trip using the I-5 South and I-10 East. You will pass through the Los Angeles basin and into the Inland Empire. Travel time is typically 80 minutes, though it can vary significantly based on traffic. This route is a major connection between the Santa Clarita Valley and the Inland Empire. It is a straightforward drive with significant traffic potential.

Total Distance: 115 km driving distance; 95 km straight-line air distance.

Fastest Way

Driving during off-peak hours is the fastest way, taking approximately 80 minutes.

Cheapest Way

Driving your own vehicle is the most practical and cost-effective method for this route.

Compare Castaic to Ontario Routes

Driving

Direct

Duration

1 hour 20 mins

Avg Price

$20-$25 in fuel

Operator

Personal Vehicle

Route

I-5 South to I-10 East

The I-10 is notoriously congested; check live maps before departing.

Travel Tips

Traffic Alerts
Use Waze to get real-time updates on accidents and construction along the I-10.
Carpooling
If you have multiple passengers, use the HOV lanes to save significant time.
Parking
Ontario is very car-friendly with ample parking at most shopping centers and business parks.
Public Transit
You can take the Metrolink from Santa Clarita to Union Station, then transfer to the San Bernardino line to Ontario.
Hydration
Keep water in your car, as traffic delays can be long and stressful.

Safety Tips

Stay Focused
The I-10 through Los Angeles requires constant attention due to frequent lane changes by other drivers.
Emergency Kit
Always carry a spare tire and basic tools, as highway shoulders can be dangerous.
Avoid Road Rage
Traffic in Los Angeles can be frustrating; stay calm and avoid aggressive drivers.
Vehicle Check
Ensure your car is well-maintained for long-distance highway driving.