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Sierra San Antonio Medical Plaza

San Antonio Regional Hospital is growing to meet the urgent care needs in Fontana, and our promise remains the same — to carry on our tradition of modern medicine with compassion.

16465 Sierra Lakes Pkwy, Fontana, CA 92336  •  Medical Plaza Main Phone: 909.434.1100


Click here to download the Outpatient Services map and information.

Services Offered:

Urgent Care


Monday - Friday
9 am - 8:00 pm

Weekends & Holidays
9 am - 5 pm

Walk-ins Welcome

Click here to make your
Urgent Care InQuicker appointment today!

Radiology (Walk-in X-ray only)

Monday - Friday
9 am - 5:00 pm

Closed Saturday, Sunday & Holidays

Laboratory Services

Monday - Friday
7:30 am - 12:30 pm

Closed Saturday, Sunday & Holidays

Rehabilitation Services (By Appointment Only)

Call 909.948.8080 for more information.