A far more experienced Dons side proved too strong for the Tangerines at Starks Park today.
In fact, United defending doggedly had a few chances of their own.
Dominating the first half, Cammy Smith and Lawrence Shankland twice went close for the visitors as did Clark Robertson.
Not that it was all one way traffic with Jamie Montgomery only inches away giving United the lead fter playing a one-two with Mario Bilate, his parting shot slipping just past.
Indeed, shortly afterwards, Montgomery was unlucky to see his deflected shot rebound off the post.
Nine minutes after the restart, Aberdeen made the breakthrough with a composed finish from Cammy Smith.
Jamie Masson added a superb second after 62nd minutes with a curling free kick.
However, United didn’t lie down and were unlucky not to pull one back when a Montgomery shot was cleared off the line.
Dundee United: Zwick, Spark, Robson, S Smith , J Souttar, Ballantyne, B Smith, Petrie, Bilate (M Smith 63), Montgomery, McLaughlin.
Substitutes not useds: Booth, Malaga, Horne.