Denny's 3170 Harbor Blvd 7:00 AM - 2:00 AM 7:00 AM - 2:00 AM 7:00 AM - 2:00 AM 7:00 AM - 2:00 AM Open 24 Hours Open 24 Hours 7:00 AM - 2:00 AM3170 Harbor Blvd Costa Mesa, CA 92626 US