Mami Nishio put up a hard fight against Miller, and took the opening game against the favourite - but the fourth seed from Japan eventually ran out of steam as Miller went on to win the next three to triumph 5-9, 9-7, 10-8, 9-5.
In her third WISPA World Tour final, the 26-year-old Panamerican Champion from Winnipeg will face second seed Melanie Jans, a three-times Canadian national champion.
Vancouver-based Jans avenged her defeat in the 2006 Canadian Nationals final when she beat third seed Carolyn Russell in four games. Jans dropped the first game, but went on to win the next three with incredible shot selection to record a 7-9, 9-1, 9-0, 9-2 victory.
The climax will mark the ninth WISPA final appearance by Montreal-born Jans.
RESULTS: Women's Sun & Surf Jericho Squash Open,
Vancouver, Canada
Semi-finals:
[1] Alana Miller (CAN) bt [4] Mami Nishio
(JPN) 5-9, 9-7, 10-8, 9-5
[2] Melanie Jans (CAN) bt [3] Carolyn Russell
(CAN) 7-9, 9-1, 9-0, 9-2