The first-quarter figure was down 18.8% from the same period a year earlier on both domestic and international flights, the General Directorate of State Airports Authority (DHMI) said in a statement.
Domestic passenger numbers slipped 20.9% year-on-year to 19.5 million in the January-March period, while 14.1 million passengers took international flights, decreasing 15.7%.
Turkish airports served 376,107 planes including overflights, down from 424,667 in the same quarter last year.
The report also said cargo traffic reached 739.859 tons in the first three months of 2020.
Hurriyet Daily News