More than 64.1 million people were registered to vote, including over 1.92 million who earlier cast their ballots at overseas polling stations.
Nearly 192,000 ballot boxes were set up for voters across Türkiye.
On May 14, no candidate won the required 50% in the first round, triggering Sunday's runoff, although Erdoğan took the lead with 49.52%.
On that day, Erdoğan's People's Alliance also won a majority in parliament.
