Wednesday's 5-2 shellacking at BMO Field gave TFC a decisive 7-4 victory on aggregate in the two-legged affair and an automatic berth in next season's CONCACAF Champions League.
It's the sixth time the Reds have defeated the Whitecaps in the showpiece event and seventh Voyageurs Cup overall.
The win affords TFC an opportunity to redeem themselves in the Champions League following a heartbreaking shootout loss to Chivas in April. Greg Vanney's side have struggled to shake off the hangover since that final.
Altidore has endured a similarly tough campaign, missing more than 10 matches this season due to foot surgery, but his fortunes changed Wednesday against the Whitecaps. The 28-year-old tallied with his right foot, left foot, and head to complete an utterly dominant performance.
His first came off a sweeping move that he started late in the first half, the second an instinctive finish inside the six-yard box, and the third off a corner.
Toronto now has 11 matches remaining to get back into the MLS playoff picture.