Turkish Airlines in recent schedule update filed expanded frequency to Thailand in summer 2019 season. As of 10SEP18, planned changes include the following.
Istanbul – Bangkok Expanded operation between 08MAY19 and 22JUN19, as TK064/065 operates daily (except first-half of June 2019), instead of 4 weekly. Overall frequency remains at 14 weekly during this period
31MAR19 – 30MAY19 Daily
31MAY19 – 15JUN19 Day x247 (Day x135 from BKK)
16JUN19 – 10OCT19 Daily
TK068 IST0125 – 1500BKK 333 D
TK064 IST2010 – 0940+1BKK 333 D
TK065 BKK2145 – 0400+1IST 333 D
TK069 BKK2300 – 0520+1IST 333 D
Istanbul – Phuket Expanded operation from 4 to 6 weekly during following period: 31MAR19 – 26APR19, 03JUL19 – 10OCT19
TK172 IST1425 – 0420+1HKT 333 x2
TK173 HKT0550 – 1200IST 333 x3
Current schedule listing in the OAG is available until 10OCT19 for the week of 09SEP18.