IndiGo in October 2019 expanded European codeshare coverage with Turkish Airlines, covering the latter’s service to London. Planned codeshare service from 01OCT19 as follows.
Istanbul – London Gatwick
From IST: TK1982/6E4173
From LGW: TK1997/6E4180
Istanbul – London Heathrow
From IST: TK1985/6E4174, TK1971/6E4170, TK1983/6E4172, TK1987/6E4176, TK1989/6E4178
From LHR: TK1988/6E4175, TK1980/6E4171