Directed by Rohit Shetty, the film also stars Kajol an "Heropanti" actress Kriti Sanon in lead roles.
Varun, 28, said the final part of the shoot will be the "biggest and the toughest."
"Off to Hyderabad for the final sched of #Dilwale. Has to be the biggest and toughest one as well. #december18th here we come," the "ABCD 2" star tweeted.
"Dilwale" not only reunites the iconic pair of Shah Rukh and Kajol on screen after their last outing "My Name Is Khan" (2010), but also brings back the 49-year-old actor and his "Chennai Express" director together.