Langfield was sent off during the 2-0 defeat on Saturday for bringing down Borja Perez in the box.
The Pittodrie side lodged an appeal against the dismissal, but the SFA'S fast track tribunal backed ref Craig Charleston's decision.
Aberdeen goalkeeper Jamie Langfield has lost his appeal against his red card against Kilmarnock and will miss tomorrow's visit of St Johnstone.
Langfield was sent off during the 2-0 defeat on Saturday for bringing down Borja Perez in the box.
The Pittodrie side lodged an appeal against the dismissal, but the SFA'S fast track tribunal backed ref Craig Charleston's decision.
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