Al Ahly increased their lead when Hussein El Shahat curled the ball into the net just before the hour mark from an assist by Kahraba, who three minutes later hit a cross-shot that Emam Ashour fired home after a quick counterattack.
The Saudi champions, appearing in the tournament for the first time since reaching the semifinals in 2005, ended their campaign with a last-minute consolation goal from Benzema.
That came just after Al Ahly's Anthony Modeste was sent off in the 90th having come on for Aliou Dieng minutes earlier.
The other semi on Tuesday sees European champions Manchester City up against Asian Champions League holders Urawa Red Diamonds, who beat CONCACAF champions Leon 1-0 earlier on Friday.
Al Ahly thrash Al-Ittihad in Club World Cup to book Fluminense semifinal
Image: REUTERS/Amr Abdallah Dalsh
Egypt's Al Ahly cruised to a 3-1 win over Al-Ittihad on Friday to book a place in the Club World Cup semifinals after Karim Benzema missed a penalty before scoring for the Saudi side.
The African champions will face Copa Libertadores title holders Fluminense of Brazil in the last four on Monday.
Al Ahly broke the deadlock in the 21st minute through left-back Ali Maaloul who converted a penalty which was awarded for handball by Al-Ittihad defender Hassan Kadesh.
Marcelo Gallardo's team battled for an equaliser and also got a spot kick for handball by Al Ahly defender Mohamed Abdelmonem.
However, Al-Ittihad's former Real Madrid striker Benzema failed to convert after his shot was brilliantly saved by goalkeeper Mohamed El Shenawy.
Al Ahly increased their lead when Hussein El Shahat curled the ball into the net just before the hour mark from an assist by Kahraba, who three minutes later hit a cross-shot that Emam Ashour fired home after a quick counterattack.
The Saudi champions, appearing in the tournament for the first time since reaching the semifinals in 2005, ended their campaign with a last-minute consolation goal from Benzema.
That came just after Al Ahly's Anthony Modeste was sent off in the 90th having come on for Aliou Dieng minutes earlier.
The other semi on Tuesday sees European champions Manchester City up against Asian Champions League holders Urawa Red Diamonds, who beat CONCACAF champions Leon 1-0 earlier on Friday.
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