Sunday's runoff of voting will start at 08:00 AM local time and end at 05:00 PM.
Together with the voters who voted in the first round, a total of more than 60 million Turkish citizens will go to the polls.
A total of 191,885 ballot boxes were opened for voters in the country.
According to Türkiye's Supreme Electoral Council, more than 1.89 million people voted in Türkiye's foreign missions and customer gates as of 10:00 AM local time on Thursday.
The number of people who voted in the first round of elections was 1.83 million.
Those who were unable to vote in their country of residence in time will be able to vote at customs gates until 05:00 PM Sunday, Anadolu reported.
Turkish President Recep Tayyip Erdogan called on people to take to the streets and vote on Saturday.
"Let's go to the polls together tomorrow for the Great Victory of Türkiye. On May 14th, let's reflect the will that emerged in the Turkish Grand National Assembly to the Presidency in a much stronger way this time," he said.
"Let's start the Century of Turkey with our votes."
Millions of voters went to the polls in the first round on May 14. Since the candidates did not reach 50 percent, no candidate emerged from the ballot box and the elections went to a runoff.
In the parliamentary elections, Erdogan's People's Alliance won a majority in parliament. In the presidential elections, the Erdogan received 49.24 percent of the vote, while Kemal Kilicdaroglu, the leader of the main opposition Republican People's Party (CHP), received 45.07 percent.
The two leaders will face off in the presidential elections on Sunday.