Currently, the Imam Khomeini Airport metro works every day from 6:10 AM – 19:30 PM. The operating hours are limited at the moment, but it will probably change in the close future. For using the Tehran Airport Metro line, you have to go to “Shahed” station at the almost end of line 1, and then change your train toward the IKIA destination. The entrance will be in front of Terminal A in the airport. The trains are not that frequent yet and there’s 1 every 80 minutes. Update Imam Khomeini Airport Metro working hours: Line 8 of Tehran metro (Green Line) from IKIA will be connected to Line 1 (Red Line) to provide travelers transportation to the city center. Through Line 4 (Yellow Line) IKIA will also be connected to Mehrabad Airport.