AirHint found the following cheapest return flights from Belgrade (BEG) to Istanbul (IST) in December 2026 (see full year).
Return flights
| 05 Dec - 12 Dec | Air Serbia | direct | |
| 16 Dec - 08 Jan | LOT | ||
| 28 Dec - 03 Jan | Air Serbia | direct | |
| 16 Dec - 08 Jan | Turkish Airlines | direct |
Also check the deals for one-way flights from Belgrade to Istanbul in December.
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