Eduardo Chen and Saúl García Arriaza were convicted for the deaths of Heydi Montúfar Lorenzana, 16, and Heiser Alexandra Mercado Santos, 18.
The Public Prosecutor’s Office initially had requested 308 years behind bars.
Prosecutors argued during the trial that the two men chatted over Facebook with the teenagers and set up a meeting that way.
The investigation showed the girls were killed Aug. 22, 2011, after being raped. Their bodies were found six days later in the southern town of Amatitlán.
These marked the first murder convictions in Guatemala where the victims and perpetrators contacted each other using Facebook.