Political newcomer Robert Abela is set to take over from Joseph Muscat following Saturday's vote.
Election results, which was revealed on Sunday, handed the leader of the ruling Labour Party 58 per cent of the votes.
He defeated initial favourite - deputy prime minister and minister of health Chris Fearne.
"I am humbled," Abela told supporters. "I thank my friend Chris (Fearne) and look forward to working together for the good of the party and the country. There is only one winner today, the Labour Party."
Abela, who was elected to the parliament for the first time just over two years ago, has promised to place increased government focus on social issues and affordable housing.
Muscat, who announced his resignation on December 1, has been accused of protecting associates involved in the 2017 murder of journalist Daphne Caruana Galizia.
SpaceX's next-generation Starship rocket reached orbit for the first time on Monday despite having one of its engines shut down unexpectedly, overcoming a hitch mid-flight to deploy its first batch of new Starlink satellites in a truncated mission ending hours earlier than originally planned.
British police said on Monday they were investigating whether individuals acting for a foreign state were involved in an apparent plot to attack an airbase used by the United States but said five suspects they had arrested would be released on bail.
Thousands sheltered on Monday in evacuation centres in the Thai capital, parts of it still flooded after havoc brought by intense weekend rain, while swelling reservoirs in an eastern province triggered orders for more to leave their homes.
Heavy rain and storms have triggered floods and landslides that killed 56 people in India, while in Nepal, 14 have died and another 11 are missing, with authorities warning on Sunday that more flash floods are possible.