A second-half hat-trick in twenty minutes by substitute, Brian Ritchie, did most of the damage to the Hibs in this festive tournament hosted by Kelty Hearts.
Prior to this, Calum Smith had netted the opener in the 20th minute with a volley following Scott Gates' perfect cross.
The first of Ritchie's goals came in the 62nd minute when he netted from close range and then two minutes later he found the net again in similar circumstances. Ritchie's third came in the 82nd minute when he rose unchallenged to head home Conrad Courts' corner-kick.
Stuart Cargill claimed the final goal in the 88th minute to seal the victory which means that Kelty will play Rosyth in next Sunday's final after they had defeated Dundonald Bluebell on penalties earlier in the day.
Kelty Hearts: Allison, Jacobs, Gates, Dalziel, T.Courts, Gilfillan, Husband, Greig, Smith, Cargill, McCabe. Subs: McPhie, Currie, C.Courts, Ritchie
Thornton Hibs: Marley, Crichton, A.Drummond, S.Drummond, Shields, Strachan, McNab, Hepburn, Wilson, Schiavone, Thomson. Subs: Ireland, Adam, Shanks, Trialist.
Referee: Mr C. McNab
Match statistics:
Attempts at goal - KH 20 TH 4
Attempts on target - KH 10 TH 2
Corners - KH 6 TH 2
Fouls committed - KH 12 TH 6
Yellow Cards - KH 0 TH 0
Red Cards - KH 0 TH 0