Istanbul is 1 hour ahead of Bucharest (or the same time during EEST). Bucharest uses Eastern European Time (EET/EEST, UTC+2/+3) while Istanbul uses Turkey Time (TRT, UTC+3). When it's 12:00 PM in Bucharest, it's 1:00 PM in Istanbul.
Bucharest observes daylight saving time while Turkey does not, so the difference varies between 0 and 1 hour throughout the year.
Best calling time: 8:00 AM - 5:00 PM Bucharest time. This corresponds to 9:00 AM - 6:00 PM in Istanbul, covering standard business hours.
Bucharest and Istanbul are neighboring cities with historical connections through the Ottoman era. Today, they have strong trade and tourism links. The Black Sea connects both countries. Direct flights take about 1.5 hours.