Frenchman Benzema opened the scoring in added time at the end of the first-half after latching onto a Toni Kroos pass.
Ronaldo, who on another day could have had a hat-trick, then doubled Real’s advantage in second-half injury time at the International Stadium Yokohama.
Zinedine Zidane’s men will now play Kashima Antlers in the final on Sunday (December 18).
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A minute's silence was held before kick-off to honour the Chapecoense victims.
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Zinedine Zidane looks on at the Yokohama International stadium in Yokohama.
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Cristiano Ronaldo goes close in the first period.
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The newly-crowned Ballon d'Or winner climbs highest.
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Ronaldo again in the thick of things.
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Ronaldo was one of the standout performers in the first period.
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He came close to scoring on a number of occasions.
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Karim Benzema opened the scoring in the first-half.
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Real Madrid celebrate.
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Luka Modric attempts an acrobatic effort.
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Cristiano added a second goal late on.
