Taking on Perth in the preliminary final, the Falcons blitzed the Demons in the last quarter to run home 14.16 (100) to 9.4 (58) victors at Claremont Oval on Sunday.
They meet South Fremantle at Subiaco Oval in the grand final this weekend for a shot at their first flag since 1960.
The sixties’ opening year was a good one for the club, with the league side also claiming the premiership. The Falcons have a chance to repeat the league-reserves double this weekend.
In Claremont, West Perth held just an eight-point lead at the final change, but restricted Perth to a measly point while amassing 5.5 to produce its biggest quarter of the game.
Ruckman Frank Stockley showed the form that’s had him in league consideration this season, with 24 disposals, nine marks, 31 hitouts and two goals.
Aidan Lynch and Corey Chalmers led scoring with three goals each.
Adelaide captain and former Falcon Nathan van Berlo could be seen watching from the stands as youngest brother Mitch played in the biggest game of his short West Perth career.
The win continued a remarkable turnaround for the Falcons, who were sitting last on the table in round eight.
They now have a shot at their first reserves flag in 53 years, having not lost a match since June.