According to ISNA, South Korea and Iran reached an aviation agreement in 1998 to allow South Korean airliners to run four flights of passenger and cargo planes.
Earlier this year, the Seoul government resumed the Seoul-Tehran air route and gave a flight license to Korean Air Lines Co., the country's largest air carrier.
In an aviation meeting held on Monday and Tuesday, the two countries reached an agreement to increase the number of weekly flights to 11 from the current four to meet rising tourism and business demand for direct flight services, according to the South Korean Ministry of Land, Infrastructure and Transportation.
The ministry said it will give additional flight permits to other air carriers, including Asiana Airlines Inc., to ferry passengers and air freight 11 times a week between Incheon, the country's main gateway on the outskirts of Seoul, and Tehran.
"The latest agreement paved the way for more than one South Korean air carrier to offer direct flight services to Iran. We expect it will boost economic and cultural exchange between the two countries," said the ministry.