|Subject: Ferry from Italy to Istanbul|
sorry to inform you there's no ferry line from Trieste or other Italian ports to Istanbul. The commercial shipping lines call at Mersin or other southern ports and there isn't a passenger service. The only option I could think about, apart from flying, is to take a ferry to Greece from either Trieste, Venice or Ancona (Central Italy). You can disembark at Igoumenitsa (about 24 hours from Trieste) and drive across northern Greece to Turkish Border and Istanbul (about 800 miles, very long drive but the Greece is wonderful). If you prefer to fly from Italy, you must leave from Milan or Rome only. Sorry for not being of help, but Istanbul is really far!