Istanbul is 0-1 hours ahead of Athens. Istanbul uses Turkey Time (TRT, UTC+3 year-round) while Athens uses Eastern European Time (EET/EEST). During Greek summer time (EEST), both cities are at UTC+3 and share the same time. During Greek winter time (EET), Istanbul is 1 hour ahead.
Turkey no longer observes daylight saving time but Greece does, so the difference varies between 0-1 hours throughout the year.
Best calling time: 9:00 AM - 5:00 PM Istanbul time. This aligns well with Athens business hours year-round due to the minimal time difference.
Istanbul and Athens are neighboring cities across the Aegean Sea, with a shared history spanning millennia. Both are major tourist destinations and are connected by short flights taking about 1.5 hours.