Originally Posted by TWA884

If they will sell you the ticket, it is a legal connection; however, it might be very tight even if your flight from MCO arrives on time.

Years ago, the MCT (minimum connect time) from domestic to international United flights at LAX was 30 minutes. I am not sure what it is nowadays. You are probably better off consulting the following thread in the United Airlines | MileagePlus forum: Consolidated Connection time/logistics-Domestic & International at LAX