Nis (INI) — Istanbul (IST): how long is the flight?
INI — IST: scheduled duration in the saved data is 1 hr 35 min, the median of available flights.
INI — IST: what is the distance?
The straight-line distance between airports INI and IST is about 612 km, not the actual flight path.
Airlines on this route
The saved board for INI — IST lists these airlines: Air Serbia.