I found seats departing Newark EWR on Friday, March 22, returning from Orlando MCO on Monday, March 25.
Other weekend travel dates departing on Fridays, and returning on Mondays, are available in March and early April. Lower fares are available for travel during the middle of the week.
It's a Basic Economy fare, which only includes a small personal item on United. A checked bag costs $30 each way. If you just want to bring a carry-on, pay $30 more each way for a standard Economy fare.
Need a room in Orlando? Here's what's available for the mentioned weekend dates on Hotelwatchdog.