Benfica had won the semi-final first leg 2-0 away and Monday's 1-1 draw at the Luz stadium meant the 24-times champions will have a chance to add to their record haul after reaching their first final since the 2003-04 season.
Cardozo fired Benfica ahead with a trademark left-footed shot inside the box just after half time. Pacos de Ferreira forward Cicero made the most from a poor Maxi Pereira backpass to level with 10 minutes to go.
The Eagles will face either Vitoria de Guimaraes or Belenenses in the final.
Guimaraes take a 2-0 advantage into the second leg of their semi-final.
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