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

Return flights

17 Sep - 29 Sep	easyJet
26 Sep - 05 Oct	Wizz Air
16 Sep - 30 Sep	Air Serbia
26 Sep - 29 Sep	Wizz Air
24 Sep - 30 Sep	Wizz Air
24 Sep - 01 Oct	Wizz Air
24 Sep - 29 Sep	Wizz Air
16 Sep - 29 Sep	Air Serbia
19 Sep - 23 Sep	Wizz Air
24 Sep - 28 Sep	Wizz Air
26 Sep - 04 Oct	AJet
19 Sep - 25 Sep	Wizz Air
26 Sep - 05 Oct	Pegasus Airlines	direct
24 Sep - 26 Sep	Wizz Air
28 Sep - 04 Oct	Pegasus Airlines
24 Sep - 01 Oct	Air Serbia	direct
30 Sep - 05 Oct	Air Serbia	direct
30 Sep - 04 Oct	Air Serbia	direct
29 Sep - 04 Oct	Air Serbia	direct
26 Sep - 04 Oct	Air Serbia	direct

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

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 September from $176

Return flights