The political satire was earlier scheduled to release a day ahead of Aanand L Rai's "Tanu Weds Manu Returns".
"#Welcome2Karachi now has a new release date. See you guys at the movies on the 28th of May," Jackky tweeted.
Directed by Ashish R Mohan, the film also stars American dancing sensation Lauren Gottlieb, besides two renowned Pakistani actors Ayub Khoso and Adnan Shah.
"Welcome 2 Karachi" is produced by Jackky's father Vashu Bhagnani.