St Helens 26 Wigan Warriors 18
Wigan led 12-8 at the break with tries from Josh Charnley and recalled Eamon O’Carroll, either side of the bursting Lee Gaskell’s stunner for Saints.
But second-half tries from Paul Wellens, Jamie Foster, who kicked four goals, and James Roby proved crucial, despite Sam Tomkins’ late consolation.
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Hide AdAnd that booked Saints’ date with Leeds at Old Trafford next Saturday.
They lost three times to Leeds in Grand Finals between 2007 and 09.
The two sides, who finished third and fifth in the regular season, will now meet for the biggest prize in the game next week.
For the best build-up to the Grand Final, stay with the Yorkshire Post all next week.