The three-time defending champions defeated top seeds Cara Black of Zimbabwe and America's Liezel Hueber 6-1, 6-2.
They will face Australian pair Samantha Stosur and Rennae Stubbs, the third seeds, who defeated Spain's Anabel Medina Garrigues and Virginia Ruano Pascual 6-7 (3/7), 6-4, 6-2, in Sunday's final.
Venus denied that the tournament was becoming too easy for them.
"Serena had a very tough competitor yesterday (a three-set semi-final win over Elena Dementieva where she saved a match point). I've had to stay on my A game to defeat each competitor," said the five-time singles champion.
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