AirHint found the following cheapest return flights from Belgrade (BEG) to Istanbul (IST) in December 2025 (see full year).

Return flights

04 Dec - 08 Dec	Pegasus Airlines	direct
11 Dec - 14 Dec	Pegasus Airlines
11 Dec - 14 Dec	Pegasus Airlines	direct
31 Dec - 12 Jan	LOT
22 Dec - 05 Jan	Air Serbia	direct
22 Dec - 31 Dec	Turkish Airlines	direct
26 Dec - 03 Jan	Aegean Airlines
25 Dec - 03 Jan	Air Serbia	direct
26 Dec - 03 Jan	Air Serbia	direct
31 Dec - 12 Jan	Air Serbia	direct

Also check the deals for one-way flights from Belgrade to Istanbul in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Belgrade to Istanbul in December from 130€

Return flights