Searching Expedia, I found seats departing Miami MIA on Thursday, November 29, returning from Fortaleza FOR on Friday, December 7.
You'll find other dates for Tue/Thu travel in November and wide open daily availability starting in late January through June.
Have a look at all our current finds from Miami (MIA) on its very own flight deal page.
Need a room in Fortaleza? Here's a list of all available accommodation for the dates mentioned on Hotelwatchdog.