Beth Mooney led the charge with a composed unbeaten 61 from 36 balls, while Ashleigh Gardner added 35 not out as the pair's unbroken stand steered Australia home with minimal fuss despite early hiccups and an injury concern for Ellyse Perry.
Australia's chase began brightly through Georgia Voll's quick 16 off 11 balls, but West Indies briefly found a foothold as Phoebe Litchfield was trapped lbw by Hayley Matthews for four and Voll was soon dismissed. Perry then retired hurt after facing just seven balls, momentarily halting Australia's momentum.
Any hopes of a contest, however, quickly faded as Mooney and Gardner took control. Their partnership blended clean striking with calm rotation of strike, putting West Indies under sustained pressure and ending the game long before the closing stages.
Earlier, West Indies were restricted to 125 for seven after a damaging middle-order collapse. Captain Hayley Matthews top-scored with 30, sharing a 47-run opening stand with Qiana Joseph, but the innings unravelled once Matthews was bowled attempting a paddle sweep off Georgia Wareham.
From there, West Indies slipped from 47 without loss to 83 for six, losing six wickets in a sharp collapse driven by Australia's spin attack. Ashleigh Gardner led the way with superb figures of 2 for 13, including a double-wicket maiden that removed Stafanie Taylor for a duck and Jahzara Claxton for nought. Georgia Wareham also took 2 for 17, while Sophie Molineux chipped in with 2 for 30 as Australia strangled the middle overs.
Shemaine Campbelle's 22 provided brief resistance, but West Indies were still short of a competitive total even after a late boost from Deandra Dottin. The experienced batter, who had earlier been taken off the field for medical treatment, returned to strike a rapid 26 off 16 balls, helping lift her side to a modest total.
Australia's control with the ball and authority in the chase ensured a one-sided finish, maintaining their perfect tournament record as they moved into Sunday's final at Lord's, where they will face either England or South Africa.
Australia returned to the top of women's T20 cricket, defeating hosts England by chasing down 151 with 17 balls to spare to claim a record-extending seventh Women's T20 World Cup title at Lord's.
Australia Women veteran Ellyse Perry will likely be called up to play in the Women's T20 World Cup Final despite being under an injury cloud.
Australia completed the highest successful chase in Women's T20 World Cup history to beat India by six wickets at Lord's on Sunday, knocking their rivals out of the tournament and setting up a semi-final against West Indies.
The South African Women were made to work hard for runs as they eventually chased down 117 to defeat Bangladesh by four wickets in the Women's T20 World Cup at Lord's on Sunday.
