The delay has long been rumoured as producers take their time making sure the eighth and final season is appropriately epic and climactic.
Turner, who plays Sansa Stark in the hit fantasy show, merrily gave the sad news to Variety.
"I'm really excited. Game of Thrones comes out in 2019," she said.
Filming for Game of Thrones season eight has already begun, although it kicked off later than for previous seasons, and some of the final episodes will reportedly be feature film-length.