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

Return flights

01 Dec - 09 Dec	AJet
05 Dec - 12 Dec	Pegasus Airlines
05 Dec - 10 Dec	Pegasus Airlines
01 Dec - 18 Dec	Pegasus Airlines
05 Dec - 09 Dec	Pegasus Airlines
05 Dec - 08 Dec	AJet
04 Dec - 16 Dec	Pegasus Airlines
12 Dec - 14 Dec	Pegasus Airlines
30 Dec - 13 Jan	Wizz Air
04 Dec - 07 Dec	Pegasus Airlines
04 Dec - 08 Dec	Pegasus Airlines
19 Dec - 06 Jan	Pegasus Airlines
23 Dec - 02 Jan	Air Serbia
15 Dec - 08 Jan	Wizz Air
10 Dec - 14 Jan	LOT
10 Dec - 12 Jan	AJet	direct
25 Dec - 12 Jan	AJet
28 Dec - 08 Jan	Wizz Air
19 Dec - 09 Jan	Pegasus Airlines	direct
26 Dec - 11 Jan	AJet

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 144€

Return flights