We took an Uber XL from the cruise ship to the airport and it was $111 all in. Uber X would be about 2/3 that, I think. We took an Uber XL from BLT to port canaveral and it was $132. We had arranged with a driver to meet us at both BLT and Port Canaveral at our appointed times (we logged onto the system once we were in his car -- it was a driver I had previously used at Food and Wine who was very reliable.
Going to the port, I think that is in their radius, but you should consider tipping because they are driving you 45 minutes away with no guarantee of a return trip.
I would not rely on Uber to make a tight connection on the way back from the port to MCO, unless you have prearranged with a driver -- there do not appear to be many drivers in that area, and before my driver logged on, the system was bouncing between "no Uber XL available" to a 25 minute wait. You may have better luck with UberX, but the XLs were few and far between.