Ronaldo rifled home with his left foot from outside the area after 10 minutes to give Madrid the lead and after Celta dominated the closing stages of the first half and the early exchanges in the second period too, Isco led a quick breakaway before expertly finding the Portuguese to make it 2-0.
Iago Aspas was later dismissed after receiving a second yellow card for diving, although he may have been shoved by Sergio Ramos, and John Guidetti got the home side back in it with a deflected effort.
However, a dominant Madrid went back in front through Karim Benzema and, after Ronaldo missed an extraordinary chance from close range, Toni Kroos made it 4-1 later on to leave Los Blancos needing only to draw at Malaga to claim the title.
Ronaldo was substituted to avoid the risk of a booking and a subsequent suspension in the final fixture at Malaga on Sunday and the Portuguese appeared frustrated to have missed the chance to claim his hat-trick.
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