The defending champions were too strong for Killeshin in Portlaoise on Sunday.
Portarlington are preparing for their sixth senior football championship county final in seven years after a comprehensive win over Killeshin last weekend.
The title holders in Laois ran out 2-19 to 0-10 winners in O'Moore Park on Sunday.
Rioghan Murphy and Colm Murphy starred with 1-5 each, while goalkeeper Killian Roche scored all but two of Killeshin's 10 points.
Portarlington manager Ronan Sweeney says their opponent's victory over Portlaoise marked their cards for the semi-final meeting:
Port meet Courtwood at O'Moore Park for the Laois Senior Football Championship final on Sunday October 11th.
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