In a match of few clear-cut chances, watched by 46,186 fans, Lewis Ferguson headed a corner past Allan McGregor 11 minutes from time.
Derek McInnes' side will now return to Hampden Park on Sunday December 2 to play holders Celtic in the final.
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Sunday 28th October 2018
Aberdeen are through to their second Betfred Cup final in three years after beating Rangers 1-0 on Sunday.
In a match of few clear-cut chances, watched by 46,186 fans, Lewis Ferguson headed a corner past Allan McGregor 11 minutes from time.
Derek McInnes' side will now return to Hampden Park on Sunday December 2 to play holders Celtic in the final.