During the guided tour of Versailles that is included with the Rick Steve's Best of Paris Tour, has it ever included the Opera House?
In December 2015 the tour encompassed the main salons & royal quarters and the Hall of Mirrors. We were "let go" on the rear terrace. All outdoor areas, Petit Trianon, Hamlet, etc. were on our own. We made our own way back to Paris by train. The opera house was not included. As another poster suggested, you can always call the RS office if you have specific questions about the itinerary. It's a great tour--you'll have a fun time!