A 20TH-consecutive win in all competitions put holders The New Saints into the final of the Nathaniel MG Cup.
In a replay of the semi-final tie halted by fog a week ago, a deflected strike from Scott Quigley after nine minutes proved to be the only goal of a closely-contested game at the Deeside Stadium.
Quigley ran to the edge of The Nomads' area and his low shot was helped on its way by Nomads midfielder Callum Morris to beat keeper John Danby.
Nick Rushton had a header cleared away in front of goal for the hosts in a lack-lustre first half of few chances.
Les Davies had a gilt-edged chance to equalise after the break but hit a post from four yards out and Nomads hit the woodwork again through Lewis Short.
In a final spell of pressure, Jay Owen's shot looked to be on its way into the net but was cleared off the line by Simon Spender and Greg Draper nearly added a second but his shot hit the crossbar as TNS booked a place in the final to meet Barry Town United on January 21.