GOL Linhas Aereas S.A have round trip airfares travelling from Miami (MIA) to Fortaleza Brazil (FOR) for $382, nonstop!
Travel Availability
Departs MIA: Nov 22, 29; Feb 3; March 13, 20; April 8, 30; May 22; June 1, 16
Returns: Dec 4, 7, 10; Feb 11, March 21, 28; April 19; May 11, 31; June 11, 26
***I would trial and error on a 7 day trip too.
Use dates and book it on Expedia . Bundling hotel with airfare will save money.
Fortaleza Brazil Travel Guide courtesy Lonely Planet
HT: Secret Flying
http://www.expedia.com/