If you don't feel like spending many hours in a train, you can consider travelling by plane. Especially if you have the possibility to book in advance, flying to Miami, FL can be definitely cheap.
Which stations serve the rail line San Diego, CA - Miami, FL?
The trains to Miami, FL will leave from San Diego, CA and will arrive at Miami, FL.
Travelling by train to Miami, FL from San Diego, CA: how many daily connections are there?
When are the frist and last trains from San Diego, CA to Miami, FL scheduled?
On average, it takes 97 hours and 45 minutes to get to Miami, FL by train, but you will need 97 hours and 21 minutes with the fastest trains. The first one is available at 13:02, whereas the last one leaves San Diego, CA at 13:02.