Paul Pogba scored Manchester United's equaliser against Hull
United, who were already 2 goals ahead after the last week's first-leg, started slowly.
And it was Hull who had the first chance of the match when Oumar Niasse lashed a shot towards goal, but David De Gea was able to punch clear.
The Tigers were then given the chance to take the lead from the spot when both Harry Maguire and Niasse were bundled over.
Tom Huddlestone opened the scoring for Hull
Tom Huddlestone stepped up and buried the spot kick past De Gea to give Hull hope in the tie.
But Marco Silva's side were almost pegged back when Zlatan Ibrahimovic curled the ball towards goal, but David Marshal produced a fine one-handed save.
After the break United thought they should have had a penalty when Huddlestone bundled over Chris Smalling, but nothing was given.
But soon after the Red Devils put the tie to bed as Marcus Rashford broke into the area and Huddlestone could only divert the ball into the path of Paul Pogba, who toe-poked the ball home.
Fans react as Man United announce team to face Hull in EFL Cup
Thu, January 26, 2017
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Fans react to Jose Mourinho's starting XI to face Hull in the EFL Cup semi-final
United almost took the lead when Marcos Rojo got free at a corner, but his header bounced on the crossbar and away.
Hull kept fighting, and almost found a way back into the tie when Niasse rose to meet a corner, but his strike thumped the crossbar.
However, Niasse did get his goal soon after to give Hull hope of a comeback when he vollyed home from close range.
But the Tigers ran out of time as Manchester United set up a clash with Southampton at Wembley next month.