• Sierra San Antonio Medical Plaza, Serving Fontana

  • Urgent Care. Walk-in Clinic.

    Conveniently located on Sierra Lakes Parkway in Fontana just north of the 210 FWY, the Sierra San Antonio Medical Plaza provides urgent care and walk-in clinic needs.  

    You can make an online appointment for quick and convenient medical care including pediatric urgent care. Alternatively, you can walk-in and wait for the next available opening.

    Our urgent care hours are below.

    Sierra San Antonio Medical Plaza

    16465 Sierra Lakes Pkwy, Fontana, CA 92336

    Services Offered:

    Urgent Care


    Monday - Friday
    9 am - 8 pm
      Weekends & Holidays
    9 am - 5 pm


    Get InQuicker by making your same-day appointment now at our Fontana location

    Sierra San Antonio Medical Plaza
    16465 Sierra Lakes Pkwy
    Fontana, CA 92336


    San Antonio Urgent Care at Sierra Lakes    

    Diagnostic Services and Treatment  

    • 3D Mammograms
    • Ultrasound
    • X-Ray
    • Imaging

    To schedule imaging services at any of our locations, please call 909.920.4726

    • Laboratory Services 909.434.1132
    • Physical Therapy 909.948.8080

    Click here to download the Outpatient Services map and information