• Fontana Urgent Care Center at Sierra San Antonio Medical Plaza

  • 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 now offers Urgent Care in Fontana

    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    

    In addition to Urgent Care, these outpatient services are available:

    Radiology Services  

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

    To schedule imaging services at any of our locations, please call 909.948.8166

    Click here to download the Outpatient Services map and information