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

Return flights

24 Sep - 30 Sep	Wizz Air
22 Sep - 30 Sep	Air Serbia
30 Sep - 07 Oct	Air Serbia
29 Sep - 03 Oct	Wizz Air
30 Sep - 05 Oct	Wizz Air
26 Sep - 30 Sep	Air Serbia	direct
23 Sep - 30 Sep	Air Serbia	direct
30 Sep - 05 Oct	Air Serbia	direct
29 Sep - 04 Oct	Air Serbia	direct
30 Sep - 03 Oct	Wizz Air
22 Sep - 28 Sep	Air Serbia
30 Sep - 10 Oct	Air Serbia	direct
23 Sep - 10 Oct	Air Serbia	direct
28 Sep - 05 Oct	Wizz Air
26 Sep - 07 Oct	AJet
25 Sep - 26 Sep	AJet
25 Sep - 28 Sep	AJet
25 Sep - 29 Sep	AJet
28 Sep - 29 Sep	AJet
23 Sep - 26 Sep	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 155€

Return flights