Neil Warnock made four changes to his starting line-up with Adam Drury, Luke Varney, David Norris, and Paul Green coming into the side. Rodolph Austin and Lee Peltier missed out through injury while Aidy White and Michael Tonge were among the subs.The first real chance of the game fell to Leeds after 11 minutes when Jason Pearce found space to plant a header over the bar. Moments later, Norris had shot blocked by Leon Cort after showing great skill following a poor Charlton clearance.It wasn't the most inspiring of opening half hours with neither side finding any real fluency to take a grip on the game.
Shortly after the half-hour, El-Hadji Diouf started a flowing move that ended with him trying to barge his way through the Charlton defence.
But United were in front on 36 minutes when Varney headed down a Michael Brown ball into the box and Norris fired home from inside the box.
The visitors had offered little in the way of a threat, but United had an escape moments before half-time when a cross took a deflection off Tom Lees and hit the woodwork.
Charlton were level just minutes into the second half, though, with their first real shot of the night. Lawrie Wilson made a deft touch to Dorian Dervite whose strike from outside of the box squeezed in the far corner.
Charlton also created an opening when Salim Kerkar couldn't quite make a good connection inside the box as the cross came in.
The second half was an open affair. Diouf won a couple of corners for Leeds and Charlton looked to attack down the flanks before delivering balls into the box.
Chances were few and far between, though, and Paddy Kenny had to be alert to deny Chris Solly after one good move by the visitors. Kerkar also sent a shot wide after some decent play by Charlton.
And Kenny had to spead himself well to make a great save in the final minute when Bradley Wright-Phillips got on the end of another low ball into the box.
United pressed in stoppage time, the visitors had to hack away a Diouf corner, and from the Charlton break, Kenny had to pull off another fine save.