The two initially faced the death sentence but the verdicts were commuted to life in prison because they pleaded guilty.
Surasak Suwannachot, 26, wielded the knife that killed Smith, 60, a mother of three, and Surin Taptong, 37, drove the getaway motorcycle, Phuketwan online reported Wednesday.
The fatal stabbing occurred on June 20. The online website said the verdicts bring to a conclusion a murder case that made headlines all around the world, but especially in Australia. The crime caused considerable concern to travel agents who support Phuket as a destination for 400,000 visitors a year.
Prime Minister Yingluck Shinawatra sent two of Thailand’s top policemen to Phuket to oversee the pursuit of the suspects, and to plan how best to make Phuket a more secure place not just for Australians but for tourists from all over the world.