Friends Marion Graham, 54, and Cathy Dinsmore, 53, from Northern Ireland, had been on extended holiday in Kusadasi on the Aegean Sea when they were killed.
Recep Cetin, 24, was convicted of the killings yesterday at a court in Izmir.
He hid the mutilated bodies in woods 75 miles from the seaside town of Kusadasi in August 2011.
A lawyer for the victims' families said: "This is the highest penalty that can be imposed."
The killer's father, Eyup Cetin, was acquitted of both counts of murder.
The victims' families later spoke of their relief that the marathon ordeal was finally over.
George Dinsmore, Cathy's brother, said they had finally got the justice they had been hoping for.
"We are very, very relieved," he said.
"We got a verdict and the closure. That's what we came here for and we have got it."
Cetin, who was known to the women as Alex, had been dating Ms Graham's 15-year-old daughter Shannon for two years.
It was claimed the waiter, who had become infatuated, was left furious after he was banned from marrying the teenager.
Determined to seek revenge, he lured the women to their deaths with the promise of a shopping trip having first arranged for Shannon to go on a fishing trip.
Their bodies were found buried in a shallow grave.